1 // layout.h -- lay out output file sections for gold -*- C++ -*-
3 // Copyright 2006, 2007, 2008, 2009 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.
34 #include "workqueue.h"
37 #include "stringpool.h"
42 class General_options;
43 class Incremental_inputs;
47 class Output_section_data;
49 class Output_section_headers;
50 class Output_segment_headers;
51 class Output_file_header;
54 class Output_data_dynamic;
55 class Output_symtab_xindex;
56 class Output_reduced_debug_abbrev_section;
57 class Output_reduced_debug_info_section;
61 // This task function handles mapping the input sections to output
62 // sections and laying them out in memory.
64 class Layout_task_runner : public Task_function_runner
67 // OPTIONS is the command line options, INPUT_OBJECTS is the list of
68 // input objects, SYMTAB is the symbol table, LAYOUT is the layout
70 Layout_task_runner(const General_options& options,
71 const Input_objects* input_objects,
76 : options_(options), input_objects_(input_objects), symtab_(symtab),
77 target_(target), layout_(layout), mapfile_(mapfile)
82 run(Workqueue*, const Task*);
85 Layout_task_runner(const Layout_task_runner&);
86 Layout_task_runner& operator=(const Layout_task_runner&);
88 const General_options& options_;
89 const Input_objects* input_objects_;
90 Symbol_table* symtab_;
96 // This class holds information about the comdat group or
97 // .gnu.linkonce section that will be kept for a given signature.
102 // For a comdat group, we build a mapping from the name of each
103 // section in the group to the section index and the size in object.
104 // When we discard a group in some other object file, we use this
105 // map to figure out which kept section the discarded section is
106 // associated with. We then use that mapping when processing relocs
107 // against discarded sections.
108 struct Comdat_section_info
110 // The section index.
115 Comdat_section_info(unsigned int a_shndx, uint64_t a_size)
116 : shndx(a_shndx), size(a_size)
120 // Most comdat groups have only one or two sections, so we use a
121 // std::map rather than an Unordered_map to optimize for that case
122 // without paying too heavily for groups with more sections.
123 typedef std::map<std::string, Comdat_section_info> Comdat_group;
127 : object_(NULL), shndx_(0), is_comdat_(false), is_group_name_(false)
128 { this->u_.linkonce_size = 0; }
130 // We need to support copies for the signature map in the Layout
131 // object, but we should never copy an object after it has been
132 // marked as a comdat section.
133 Kept_section(const Kept_section& k)
134 : object_(k.object_), shndx_(k.shndx_), is_comdat_(false),
135 is_group_name_(k.is_group_name_)
137 gold_assert(!k.is_comdat_);
138 this->u_.linkonce_size = 0;
143 if (this->is_comdat_)
144 delete this->u_.group_sections;
147 // The object where this section lives.
150 { return this->object_; }
154 set_object(Relobj* object)
156 gold_assert(this->object_ == NULL);
157 this->object_ = object;
160 // The section index.
163 { return this->shndx_; }
165 // Set the section index.
167 set_shndx(unsigned int shndx)
169 gold_assert(this->shndx_ == 0);
170 this->shndx_ = shndx;
173 // Whether this is a comdat group.
176 { return this->is_comdat_; }
178 // Set that this is a comdat group.
182 gold_assert(!this->is_comdat_);
183 this->is_comdat_ = true;
184 this->u_.group_sections = new Comdat_group();
187 // Whether this is associated with the name of a group or section
188 // rather than the symbol name derived from a linkonce section.
190 is_group_name() const
191 { return this->is_group_name_; }
193 // Note that this represents a comdat group rather than a single
197 { this->is_group_name_ = true; }
199 // Add a section to the group list.
201 add_comdat_section(const std::string& name, unsigned int shndx,
204 gold_assert(this->is_comdat_);
205 Comdat_section_info sinfo(shndx, size);
206 this->u_.group_sections->insert(std::make_pair(name, sinfo));
209 // Look for a section name in the group list, and return whether it
210 // was found. If found, returns the section index and size.
212 find_comdat_section(const std::string& name, unsigned int *pshndx,
213 uint64_t *psize) const
215 gold_assert(this->is_comdat_);
216 Comdat_group::const_iterator p = this->u_.group_sections->find(name);
217 if (p == this->u_.group_sections->end())
219 *pshndx = p->second.shndx;
220 *psize = p->second.size;
224 // If there is only one section in the group list, return true, and
225 // return the section index and size.
227 find_single_comdat_section(unsigned int *pshndx, uint64_t *psize) const
229 gold_assert(this->is_comdat_);
230 if (this->u_.group_sections->size() != 1)
232 Comdat_group::const_iterator p = this->u_.group_sections->begin();
233 *pshndx = p->second.shndx;
234 *psize = p->second.size;
238 // Return the size of a linkonce section.
240 linkonce_size() const
242 gold_assert(!this->is_comdat_);
243 return this->u_.linkonce_size;
246 // Set the size of a linkonce section.
248 set_linkonce_size(uint64_t size)
250 gold_assert(!this->is_comdat_);
251 this->u_.linkonce_size = size;
256 Kept_section& operator=(const Kept_section&);
258 // The object containing the comdat group or .gnu.linkonce section.
260 // Index of the group section for comdats and the section itself for
263 // True if this is for a comdat group rather than a .gnu.linkonce
266 // The Kept_sections are values of a mapping, that maps names to
267 // them. This field is true if this struct is associated with the
268 // name of a comdat or .gnu.linkonce, false if it is associated with
269 // the name of a symbol obtained from the .gnu.linkonce.* name
270 // through some heuristics.
274 // If the is_comdat_ field is true, this holds a map from names of
275 // the sections in the group to section indexes in object_ and to
277 Comdat_group* group_sections;
278 // If the is_comdat_ field is false, this holds the size of the
280 uint64_t linkonce_size;
284 // This class handles the details of laying out input sections.
289 Layout(int number_of_input_files, Script_options*);
293 delete this->relaxation_debug_check_;
294 delete this->segment_states_;
297 // Given an input section SHNDX, named NAME, with data in SHDR, from
298 // the object file OBJECT, return the output section where this
299 // input section should go. RELOC_SHNDX is the index of a
300 // relocation section which applies to this section, or 0 if none,
301 // or -1U if more than one. RELOC_TYPE is the type of the
302 // relocation section if there is one. Set *OFFSET to the offset
303 // within the output section.
304 template<int size, bool big_endian>
306 layout(Sized_relobj<size, big_endian> *object, unsigned int shndx,
307 const char* name, const elfcpp::Shdr<size, big_endian>& shdr,
308 unsigned int reloc_shndx, unsigned int reloc_type, off_t* offset);
310 // Layout an input reloc section when doing a relocatable link. The
311 // section is RELOC_SHNDX in OBJECT, with data in SHDR.
312 // DATA_SECTION is the reloc section to which it refers. RR is the
313 // relocatable information.
314 template<int size, bool big_endian>
316 layout_reloc(Sized_relobj<size, big_endian>* object,
317 unsigned int reloc_shndx,
318 const elfcpp::Shdr<size, big_endian>& shdr,
319 Output_section* data_section,
320 Relocatable_relocs* rr);
322 // Layout a group section when doing a relocatable link.
323 template<int size, bool big_endian>
325 layout_group(Symbol_table* symtab,
326 Sized_relobj<size, big_endian>* object,
327 unsigned int group_shndx,
328 const char* group_section_name,
329 const char* signature,
330 const elfcpp::Shdr<size, big_endian>& shdr,
331 elfcpp::Elf_Word flags,
332 std::vector<unsigned int>* shndxes);
334 // Like layout, only for exception frame sections. OBJECT is an
335 // object file. SYMBOLS is the contents of the symbol table
336 // section, with size SYMBOLS_SIZE. SYMBOL_NAMES is the contents of
337 // the symbol name section, with size SYMBOL_NAMES_SIZE. SHNDX is a
338 // .eh_frame section in OBJECT. SHDR is the section header.
339 // RELOC_SHNDX is the index of a relocation section which applies to
340 // this section, or 0 if none, or -1U if more than one. RELOC_TYPE
341 // is the type of the relocation section if there is one. This
342 // returns the output section, and sets *OFFSET to the offset.
343 template<int size, bool big_endian>
345 layout_eh_frame(Sized_relobj<size, big_endian>* object,
346 const unsigned char* symbols,
348 const unsigned char* symbol_names,
349 off_t symbol_names_size,
351 const elfcpp::Shdr<size, big_endian>& shdr,
352 unsigned int reloc_shndx, unsigned int reloc_type,
355 // Handle a GNU stack note. This is called once per input object
356 // file. SEEN_GNU_STACK is true if the object file has a
357 // .note.GNU-stack section. GNU_STACK_FLAGS is the section flags
358 // from that section if there was one.
360 layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags);
362 // Add an Output_section_data to the layout. This is used for
363 // special sections like the GOT section. IS_DYNAMIC_LINKER_SECTION
364 // is true for sections which are used by the dynamic linker, such
365 // as dynamic reloc sections.
367 add_output_section_data(const char* name, elfcpp::Elf_Word type,
368 elfcpp::Elf_Xword flags,
369 Output_section_data*, bool is_dynamic_linker_section);
371 // Create dynamic sections if necessary.
373 create_initial_dynamic_sections(Symbol_table*);
375 // Define __start and __stop symbols for output sections.
377 define_section_symbols(Symbol_table*);
379 // Create automatic note sections.
383 // Create sections for linker scripts.
385 create_script_sections()
386 { this->script_options_->create_script_sections(this); }
388 // Define symbols from any linker script.
390 define_script_symbols(Symbol_table* symtab)
391 { this->script_options_->add_symbols_to_table(symtab); }
393 // Define symbols for group signatures.
395 define_group_signatures(Symbol_table*);
397 // Return the Stringpool used for symbol names.
400 { return &this->sympool_; }
402 // Return the Stringpool used for dynamic symbol names and dynamic
406 { return &this->dynpool_; }
408 // Return the symtab_xindex section used to hold large section
409 // indexes for the normal symbol table.
410 Output_symtab_xindex*
411 symtab_xindex() const
412 { return this->symtab_xindex_; }
414 // Return the dynsym_xindex section used to hold large section
415 // indexes for the dynamic symbol table.
416 Output_symtab_xindex*
417 dynsym_xindex() const
418 { return this->dynsym_xindex_; }
420 // Return whether a section is a .gnu.linkonce section, given the
423 is_linkonce(const char* name)
424 { return strncmp(name, ".gnu.linkonce", sizeof(".gnu.linkonce") - 1) == 0; }
426 // Return true if a section is a debugging section.
428 is_debug_info_section(const char* name)
430 // Debugging sections can only be recognized by name.
431 return (strncmp(name, ".debug", sizeof(".debug") - 1) == 0
432 || strncmp(name, ".gnu.linkonce.wi.",
433 sizeof(".gnu.linkonce.wi.") - 1) == 0
434 || strncmp(name, ".line", sizeof(".line") - 1) == 0
435 || strncmp(name, ".stab", sizeof(".stab") - 1) == 0);
438 // Check if a comdat group or .gnu.linkonce section with the given
439 // NAME is selected for the link. If there is already a section,
440 // *KEPT_SECTION is set to point to the signature and the function
441 // returns false. Otherwise, OBJECT, SHNDX,IS_COMDAT, and
442 // IS_GROUP_NAME are recorded for this NAME in the layout object,
443 // *KEPT_SECTION is set to the internal copy and the function return
446 find_or_add_kept_section(const std::string& name, Relobj* object,
447 unsigned int shndx, bool is_comdat,
448 bool is_group_name, Kept_section** kept_section);
450 // Finalize the layout after all the input sections have been added.
452 finalize(const Input_objects*, Symbol_table*, Target*, const Task*);
454 // Return whether any sections require postprocessing.
456 any_postprocessing_sections() const
457 { return this->any_postprocessing_sections_; }
459 // Return the size of the output file.
461 output_file_size() const
462 { return this->output_file_size_; }
464 // Return the TLS segment. This will return NULL if there isn't
468 { return this->tls_segment_; }
470 // Return the normal symbol table.
472 symtab_section() const
474 gold_assert(this->symtab_section_ != NULL);
475 return this->symtab_section_;
478 // Return the dynamic symbol table.
480 dynsym_section() const
482 gold_assert(this->dynsym_section_ != NULL);
483 return this->dynsym_section_;
486 // Return the dynamic tags.
489 { return this->dynamic_data_; }
491 // Write out the output sections.
493 write_output_sections(Output_file* of) const;
495 // Write out data not associated with an input file or the symbol
498 write_data(const Symbol_table*, Output_file*) const;
500 // Write out output sections which can not be written until all the
501 // input sections are complete.
503 write_sections_after_input_sections(Output_file* of);
505 // Return an output section named NAME, or NULL if there is none.
507 find_output_section(const char* name) const;
509 // Return an output segment of type TYPE, with segment flags SET set
510 // and segment flags CLEAR clear. Return NULL if there is none.
512 find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set,
513 elfcpp::Elf_Word clear) const;
515 // Return the number of segments we expect to produce.
517 expected_segment_count() const;
519 // Set a flag to indicate that an object file uses the static TLS model.
522 { this->has_static_tls_ = true; }
524 // Return true if any object file uses the static TLS model.
526 has_static_tls() const
527 { return this->has_static_tls_; }
529 // Return the options which may be set by a linker script.
532 { return this->script_options_; }
534 const Script_options*
535 script_options() const
536 { return this->script_options_; }
538 // Return the object managing inputs in incremental build. NULL in
539 // non-incremental builds.
542 { return this->incremental_inputs_; }
544 // Compute and write out the build ID if needed.
546 write_build_id(Output_file*) const;
548 // Rewrite output file in binary format.
550 write_binary(Output_file* in) const;
552 // Print output sections to the map file.
554 print_to_mapfile(Mapfile*) const;
556 // Dump statistical information to stderr.
560 // A list of segments.
562 typedef std::vector<Output_segment*> Segment_list;
564 // A list of sections.
566 typedef std::vector<Output_section*> Section_list;
568 // The list of information to write out which is not attached to
569 // either a section or a segment.
570 typedef std::vector<Output_data*> Data_list;
572 // Store the allocated sections into the section list. This is used
573 // by the linker script code.
575 get_allocated_sections(Section_list*) const;
577 // Make a section for a linker script to hold data.
579 make_output_section_for_script(const char* name);
581 // Make a segment. This is used by the linker script code.
583 make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags);
585 // Return the number of segments.
587 segment_count() const
588 { return this->segment_list_.size(); }
590 // Map from section flags to segment flags.
591 static elfcpp::Elf_Word
592 section_flags_to_segment(elfcpp::Elf_Xword flags);
594 // Attach sections to segments.
596 attach_sections_to_segments();
598 // For relaxation clean up, we need to know output section data created
599 // from a linker script.
601 new_output_section_data_from_script(Output_section_data* posd)
603 if (this->record_output_section_data_from_script_)
604 this->script_output_section_data_list_.push_back(posd);
607 // Return section list.
610 { return this->section_list_; }
613 Layout(const Layout&);
614 Layout& operator=(const Layout&);
616 // Mapping from input section names to output section names.
617 struct Section_name_mapping
624 static const Section_name_mapping section_name_mapping[];
625 static const int section_name_mapping_count;
627 // During a relocatable link, a list of group sections and
629 struct Group_signature
631 // The group section.
632 Output_section* section;
634 const char* signature;
637 : section(NULL), signature(NULL)
640 Group_signature(Output_section* sectiona, const char* signaturea)
641 : section(sectiona), signature(signaturea)
644 typedef std::vector<Group_signature> Group_signatures;
646 // Create a note section, filling in the header.
648 create_note(const char* name, int note_type, const char *section_name,
649 size_t descsz, bool allocate, size_t* trailing_padding);
651 // Create a note section for gold version.
655 // Record whether the stack must be executable.
657 create_executable_stack_info();
659 // Create a build ID note if needed.
663 // Link .stab and .stabstr sections.
665 link_stabs_sections();
667 // Create .gnu_incremental_inputs and .gnu_incremental_strtab sections needed
668 // for the next run of incremental linking to check what has changed.
670 create_incremental_info_sections();
672 // Find the first read-only PT_LOAD segment, creating one if
675 find_first_load_seg();
677 // Count the local symbols in the regular symbol table and the dynamic
678 // symbol table, and build the respective string pools.
680 count_local_symbols(const Task*, const Input_objects*);
682 // Create the output sections for the symbol table.
684 create_symtab_sections(const Input_objects*, Symbol_table*,
685 unsigned int, off_t*);
687 // Create the .shstrtab section.
691 // Create the section header table.
693 create_shdrs(const Output_section* shstrtab_section, off_t*);
695 // Create the dynamic symbol table.
697 create_dynamic_symtab(const Input_objects*, Symbol_table*,
698 Output_section** pdynstr,
699 unsigned int* plocal_dynamic_count,
700 std::vector<Symbol*>* pdynamic_symbols,
703 // Assign offsets to each local portion of the dynamic symbol table.
705 assign_local_dynsym_offsets(const Input_objects*);
707 // Finish the .dynamic section and PT_DYNAMIC segment.
709 finish_dynamic_section(const Input_objects*, const Symbol_table*);
711 // Set the size of the _DYNAMIC symbol.
713 set_dynamic_symbol_size(const Symbol_table*);
715 // Create the .interp section and PT_INTERP segment.
717 create_interp(const Target* target);
719 // Create the version sections.
721 create_version_sections(const Versions*,
723 unsigned int local_symcount,
724 const std::vector<Symbol*>& dynamic_symbols,
725 const Output_section* dynstr);
727 template<int size, bool big_endian>
729 sized_create_version_sections(const Versions* versions,
731 unsigned int local_symcount,
732 const std::vector<Symbol*>& dynamic_symbols,
733 const Output_section* dynstr);
735 // Return whether to include this section in the link.
736 template<int size, bool big_endian>
738 include_section(Sized_relobj<size, big_endian>* object, const char* name,
739 const elfcpp::Shdr<size, big_endian>&);
741 // Return the output section name to use given an input section
742 // name. Set *PLEN to the length of the name. *PLEN must be
743 // initialized to the length of NAME.
745 output_section_name(const char* name, size_t* plen);
747 // Return the number of allocated output sections.
749 allocated_output_section_count() const;
751 // Return the output section for NAME, TYPE and FLAGS.
753 get_output_section(const char* name, Stringpool::Key name_key,
754 elfcpp::Elf_Word type, elfcpp::Elf_Xword flags,
755 bool is_interp, bool is_dynamic_linker_section);
757 // Choose the output section for NAME in RELOBJ.
759 choose_output_section(const Relobj* relobj, const char* name,
760 elfcpp::Elf_Word type, elfcpp::Elf_Xword flags,
761 bool is_input_section, bool is_interp,
762 bool is_dynamic_linker_section);
764 // Create a new Output_section.
766 make_output_section(const char* name, elfcpp::Elf_Word type,
767 elfcpp::Elf_Xword flags, bool is_interp,
768 bool is_dynamic_linker_section);
770 // Attach a section to a segment.
772 attach_section_to_segment(Output_section*);
774 // Attach an allocated section to a segment.
776 attach_allocated_section_to_segment(Output_section*);
778 // Set the final file offsets of all the segments.
780 set_segment_offsets(const Target*, Output_segment*, unsigned int* pshndx);
782 // Set the file offsets of the sections when doing a relocatable
785 set_relocatable_section_offsets(Output_data*, unsigned int* pshndx);
787 // Set the final file offsets of all the sections not associated
788 // with a segment. We set section offsets in three passes: the
789 // first handles all allocated sections, the second sections that
790 // require postprocessing, and the last the late-bound STRTAB
791 // sections (probably only shstrtab, which is the one we care about
792 // because it holds section names).
793 enum Section_offset_pass
795 BEFORE_INPUT_SECTIONS_PASS,
796 POSTPROCESSING_SECTIONS_PASS,
797 STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS
800 set_section_offsets(off_t, Section_offset_pass pass);
802 // Set the final section indexes of all the sections not associated
803 // with a segment. Returns the next unused index.
805 set_section_indexes(unsigned int pshndx);
807 // Set the section addresses when using a script.
809 set_section_addresses_from_script(Symbol_table*);
811 // Find appropriate places or orphan sections in a script.
813 place_orphan_sections_in_script();
815 // Return whether SEG1 comes before SEG2 in the output file.
817 segment_precedes(const Output_segment* seg1, const Output_segment* seg2);
819 // Use to save and restore segments during relaxation.
820 typedef Unordered_map<const Output_segment*, const Output_segment*>
823 // Save states of current output segments.
825 save_segments(Segment_states*);
827 // Restore output segment states.
829 restore_segments(const Segment_states*);
831 // Clean up after relaxation so that it is possible to lay out the
832 // sections and segments again.
834 clean_up_after_relaxation();
836 // Doing preparation work for relaxation. This is factored out to make
837 // Layout::finalized a bit smaller and easier to read.
839 prepare_for_relaxation();
841 // Main body of the relaxation loop, which lays out the section.
843 relaxation_loop_body(int, Target*, Symbol_table*, Output_segment**,
844 Output_segment*, Output_segment_headers*,
845 Output_file_header*, unsigned int*);
847 // A mapping used for kept comdats/.gnu.linkonce group signatures.
848 typedef Unordered_map<std::string, Kept_section> Signatures;
850 // Mapping from input section name/type/flags to output section. We
851 // use canonicalized strings here.
853 typedef std::pair<Stringpool::Key,
854 std::pair<elfcpp::Elf_Word, elfcpp::Elf_Xword> > Key;
859 operator()(const Key& k) const;
862 typedef Unordered_map<Key, Output_section*, Hash_key> Section_name_map;
864 // A comparison class for segments.
866 struct Compare_segments
869 operator()(const Output_segment* seg1, const Output_segment* seg2)
870 { return Layout::segment_precedes(seg1, seg2); }
873 typedef std::vector<Output_section_data*> Output_section_data_list;
875 // Debug checker class.
876 class Relaxation_debug_check
879 Relaxation_debug_check()
883 // Check that sections and special data are in reset states.
885 check_output_data_for_reset_values(const Layout::Section_list&,
886 const Layout::Data_list&);
888 // Record information of a section list.
890 read_sections(const Layout::Section_list&);
892 // Verify a section list with recorded information.
894 verify_sections(const Layout::Section_list&);
897 // Information we care about a section.
900 // Output section described by this.
901 Output_section* output_section;
910 // Section information.
911 std::vector<Section_info> section_infos_;
914 // The number of input files, for sizing tables.
915 int number_of_input_files_;
916 // Information set by scripts or by command line options.
917 Script_options* script_options_;
918 // The output section names.
919 Stringpool namepool_;
920 // The output symbol names.
922 // The dynamic strings, if needed.
924 // The list of group sections and linkonce sections which we have seen.
925 Signatures signatures_;
926 // The mapping from input section name/type/flags to output sections.
927 Section_name_map section_name_map_;
928 // The list of output segments.
929 Segment_list segment_list_;
930 // The list of output sections.
931 Section_list section_list_;
932 // The list of output sections which are not attached to any output
934 Section_list unattached_section_list_;
935 // The list of unattached Output_data objects which require special
936 // handling because they are not Output_sections.
937 Data_list special_output_list_;
938 // The section headers.
939 Output_section_headers* section_headers_;
940 // A pointer to the PT_TLS segment if there is one.
941 Output_segment* tls_segment_;
942 // A pointer to the PT_GNU_RELRO segment if there is one.
943 Output_segment* relro_segment_;
944 // The SHT_SYMTAB output section.
945 Output_section* symtab_section_;
946 // The SHT_SYMTAB_SHNDX for the regular symbol table if there is one.
947 Output_symtab_xindex* symtab_xindex_;
948 // The SHT_DYNSYM output section if there is one.
949 Output_section* dynsym_section_;
950 // The SHT_SYMTAB_SHNDX for the dynamic symbol table if there is one.
951 Output_symtab_xindex* dynsym_xindex_;
952 // The SHT_DYNAMIC output section if there is one.
953 Output_section* dynamic_section_;
954 // The _DYNAMIC symbol if there is one.
955 Symbol* dynamic_symbol_;
956 // The dynamic data which goes into dynamic_section_.
957 Output_data_dynamic* dynamic_data_;
958 // The exception frame output section if there is one.
959 Output_section* eh_frame_section_;
960 // The exception frame data for eh_frame_section_.
961 Eh_frame* eh_frame_data_;
962 // Whether we have added eh_frame_data_ to the .eh_frame section.
963 bool added_eh_frame_data_;
964 // The exception frame header output section if there is one.
965 Output_section* eh_frame_hdr_section_;
966 // The space for the build ID checksum if there is one.
967 Output_section_data* build_id_note_;
968 // The output section containing dwarf abbreviations
969 Output_reduced_debug_abbrev_section* debug_abbrev_;
970 // The output section containing the dwarf debug info tree
971 Output_reduced_debug_info_section* debug_info_;
972 // A list of group sections and their signatures.
973 Group_signatures group_signatures_;
974 // The size of the output file.
975 off_t output_file_size_;
976 // Whether we have attached the sections to the segments.
977 bool sections_are_attached_;
978 // Whether we have seen an object file marked to require an
980 bool input_requires_executable_stack_;
981 // Whether we have seen at least one object file with an executable
983 bool input_with_gnu_stack_note_;
984 // Whether we have seen at least one object file without an
985 // executable stack marker.
986 bool input_without_gnu_stack_note_;
987 // Whether we have seen an object file that uses the static TLS model.
988 bool has_static_tls_;
989 // Whether any sections require postprocessing.
990 bool any_postprocessing_sections_;
991 // Whether we have resized the signatures_ hash table.
992 bool resized_signatures_;
993 // Whether we have created a .stab*str output section.
994 bool have_stabstr_section_;
995 // In incremental build, holds information check the inputs and build the
996 // .gnu_incremental_inputs section.
997 Incremental_inputs* incremental_inputs_;
998 // Whether we record output section data created in script
999 bool record_output_section_data_from_script_;
1000 // List of output data that needs to be removed at relexation clean up.
1001 Output_section_data_list script_output_section_data_list_;
1002 // Structure to save segment states before entering the relaxation loop.
1003 Segment_states* segment_states_;
1004 // A relaxation debug checker. We only create one when in debugging mode.
1005 Relaxation_debug_check* relaxation_debug_check_;
1008 // This task handles writing out data in output sections which is not
1009 // part of an input section, or which requires special handling. When
1010 // this is done, it unblocks both output_sections_blocker and
1013 class Write_sections_task : public Task
1016 Write_sections_task(const Layout* layout, Output_file* of,
1017 Task_token* output_sections_blocker,
1018 Task_token* final_blocker)
1019 : layout_(layout), of_(of),
1020 output_sections_blocker_(output_sections_blocker),
1021 final_blocker_(final_blocker)
1024 // The standard Task methods.
1030 locks(Task_locker*);
1037 { return "Write_sections_task"; }
1040 class Write_sections_locker;
1042 const Layout* layout_;
1044 Task_token* output_sections_blocker_;
1045 Task_token* final_blocker_;
1048 // This task handles writing out data which is not part of a section
1051 class Write_data_task : public Task
1054 Write_data_task(const Layout* layout, const Symbol_table* symtab,
1055 Output_file* of, Task_token* final_blocker)
1056 : layout_(layout), symtab_(symtab), of_(of), final_blocker_(final_blocker)
1059 // The standard Task methods.
1065 locks(Task_locker*);
1072 { return "Write_data_task"; }
1075 const Layout* layout_;
1076 const Symbol_table* symtab_;
1078 Task_token* final_blocker_;
1081 // This task handles writing out the global symbols.
1083 class Write_symbols_task : public Task
1086 Write_symbols_task(const Layout* layout, const Symbol_table* symtab,
1087 const Input_objects* input_objects,
1088 const Stringpool* sympool, const Stringpool* dynpool,
1089 Output_file* of, Task_token* final_blocker)
1090 : layout_(layout), symtab_(symtab), input_objects_(input_objects),
1091 sympool_(sympool), dynpool_(dynpool), of_(of),
1092 final_blocker_(final_blocker)
1095 // The standard Task methods.
1101 locks(Task_locker*);
1108 { return "Write_symbols_task"; }
1111 const Layout* layout_;
1112 const Symbol_table* symtab_;
1113 const Input_objects* input_objects_;
1114 const Stringpool* sympool_;
1115 const Stringpool* dynpool_;
1117 Task_token* final_blocker_;
1120 // This task handles writing out data in output sections which can't
1121 // be written out until all the input sections have been handled.
1122 // This is for sections whose contents is based on the contents of
1123 // other output sections.
1125 class Write_after_input_sections_task : public Task
1128 Write_after_input_sections_task(Layout* layout, Output_file* of,
1129 Task_token* input_sections_blocker,
1130 Task_token* final_blocker)
1131 : layout_(layout), of_(of),
1132 input_sections_blocker_(input_sections_blocker),
1133 final_blocker_(final_blocker)
1136 // The standard Task methods.
1142 locks(Task_locker*);
1149 { return "Write_after_input_sections_task"; }
1154 Task_token* input_sections_blocker_;
1155 Task_token* final_blocker_;
1158 // This task function handles closing the file.
1160 class Close_task_runner : public Task_function_runner
1163 Close_task_runner(const General_options* options, const Layout* layout,
1165 : options_(options), layout_(layout), of_(of)
1168 // Run the operation.
1170 run(Workqueue*, const Task*);
1173 const General_options* options_;
1174 const Layout* layout_;
1178 // A small helper function to align an address.
1181 align_address(uint64_t address, uint64_t addralign)
1184 address = (address + addralign - 1) &~ (addralign - 1);
1188 } // End namespace gold.
1190 #endif // !defined(GOLD_LAYOUT_H)