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[binutils.git] / gold / layout.h
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1 // layout.h -- lay out output file sections for gold -*- C++ -*-
3 // Copyright 2006, 2007, 2008 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.
23 #ifndef GOLD_LAYOUT_H
24 #define GOLD_LAYOUT_H
26 #include <cstring>
27 #include <list>
28 #include <string>
29 #include <utility>
30 #include <vector>
32 #include "script.h"
33 #include "workqueue.h"
34 #include "object.h"
35 #include "dynobj.h"
36 #include "stringpool.h"
38 namespace gold
41 class General_options;
42 class Input_objects;
43 class Mapfile;
44 class Symbol_table;
45 class Output_section_data;
46 class Output_section;
47 class Output_section_headers;
48 class Output_segment;
49 class Output_data;
50 class Output_data_dynamic;
51 class Output_symtab_xindex;
52 class Output_reduced_debug_abbrev_section;
53 class Output_reduced_debug_info_section;
54 class Eh_frame;
55 class Target;
57 // This task function handles mapping the input sections to output
58 // sections and laying them out in memory.
60 class Layout_task_runner : public Task_function_runner
62 public:
63 // OPTIONS is the command line options, INPUT_OBJECTS is the list of
64 // input objects, SYMTAB is the symbol table, LAYOUT is the layout
65 // object.
66 Layout_task_runner(const General_options& options,
67 const Input_objects* input_objects,
68 Symbol_table* symtab,
69 Target* target,
70 Layout* layout,
71 Mapfile* mapfile)
72 : options_(options), input_objects_(input_objects), symtab_(symtab),
73 target_(target), layout_(layout), mapfile_(mapfile)
74 { }
76 // Run the operation.
77 void
78 run(Workqueue*, const Task*);
80 private:
81 Layout_task_runner(const Layout_task_runner&);
82 Layout_task_runner& operator=(const Layout_task_runner&);
84 const General_options& options_;
85 const Input_objects* input_objects_;
86 Symbol_table* symtab_;
87 Target* target_;
88 Layout* layout_;
89 Mapfile* mapfile_;
92 // This class handles the details of laying out input sections.
94 class Layout
96 public:
97 Layout(const General_options& options, Script_options*);
99 // Given an input section SHNDX, named NAME, with data in SHDR, from
100 // the object file OBJECT, return the output section where this
101 // input section should go. RELOC_SHNDX is the index of a
102 // relocation section which applies to this section, or 0 if none,
103 // or -1U if more than one. RELOC_TYPE is the type of the
104 // relocation section if there is one. Set *OFFSET to the offset
105 // within the output section.
106 template<int size, bool big_endian>
107 Output_section*
108 layout(Sized_relobj<size, big_endian> *object, unsigned int shndx,
109 const char* name, const elfcpp::Shdr<size, big_endian>& shdr,
110 unsigned int reloc_shndx, unsigned int reloc_type, off_t* offset);
112 // Layout an input reloc section when doing a relocatable link. The
113 // section is RELOC_SHNDX in OBJECT, with data in SHDR.
114 // DATA_SECTION is the reloc section to which it refers. RR is the
115 // relocatable information.
116 template<int size, bool big_endian>
117 Output_section*
118 layout_reloc(Sized_relobj<size, big_endian>* object,
119 unsigned int reloc_shndx,
120 const elfcpp::Shdr<size, big_endian>& shdr,
121 Output_section* data_section,
122 Relocatable_relocs* rr);
124 // Layout a group section when doing a relocatable link.
125 template<int size, bool big_endian>
126 void
127 layout_group(Symbol_table* symtab,
128 Sized_relobj<size, big_endian>* object,
129 unsigned int group_shndx,
130 const char* group_section_name,
131 const char* signature,
132 const elfcpp::Shdr<size, big_endian>& shdr,
133 elfcpp::Elf_Word flags,
134 std::vector<unsigned int>* shndxes);
136 // Like layout, only for exception frame sections. OBJECT is an
137 // object file. SYMBOLS is the contents of the symbol table
138 // section, with size SYMBOLS_SIZE. SYMBOL_NAMES is the contents of
139 // the symbol name section, with size SYMBOL_NAMES_SIZE. SHNDX is a
140 // .eh_frame section in OBJECT. SHDR is the section header.
141 // RELOC_SHNDX is the index of a relocation section which applies to
142 // this section, or 0 if none, or -1U if more than one. RELOC_TYPE
143 // is the type of the relocation section if there is one. This
144 // returns the output section, and sets *OFFSET to the offset.
145 template<int size, bool big_endian>
146 Output_section*
147 layout_eh_frame(Sized_relobj<size, big_endian>* object,
148 const unsigned char* symbols,
149 off_t symbols_size,
150 const unsigned char* symbol_names,
151 off_t symbol_names_size,
152 unsigned int shndx,
153 const elfcpp::Shdr<size, big_endian>& shdr,
154 unsigned int reloc_shndx, unsigned int reloc_type,
155 off_t* offset);
157 // Handle a GNU stack note. This is called once per input object
158 // file. SEEN_GNU_STACK is true if the object file has a
159 // .note.GNU-stack section. GNU_STACK_FLAGS is the section flags
160 // from that section if there was one.
161 void
162 layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags);
164 // Add an Output_section_data to the layout. This is used for
165 // special sections like the GOT section.
166 Output_section*
167 add_output_section_data(const char* name, elfcpp::Elf_Word type,
168 elfcpp::Elf_Xword flags,
169 Output_section_data*);
171 // Create dynamic sections if necessary.
172 void
173 create_initial_dynamic_sections(Symbol_table*);
175 // Define __start and __stop symbols for output sections.
176 void
177 define_section_symbols(Symbol_table*);
179 // Create sections for linker scripts.
180 void
181 create_script_sections()
182 { this->script_options_->create_script_sections(this); }
184 // Define symbols from any linker script.
185 void
186 define_script_symbols(Symbol_table* symtab)
187 { this->script_options_->add_symbols_to_table(symtab); }
189 // Define symbols for group signatures.
190 void
191 define_group_signatures(Symbol_table*);
193 // Return the Stringpool used for symbol names.
194 const Stringpool*
195 sympool() const
196 { return &this->sympool_; }
198 // Return the Stringpool used for dynamic symbol names and dynamic
199 // tags.
200 const Stringpool*
201 dynpool() const
202 { return &this->dynpool_; }
204 // Return the symtab_xindex section used to hold large section
205 // indexes for the normal symbol table.
206 Output_symtab_xindex*
207 symtab_xindex() const
208 { return this->symtab_xindex_; }
210 // Return the dynsym_xindex section used to hold large section
211 // indexes for the dynamic symbol table.
212 Output_symtab_xindex*
213 dynsym_xindex() const
214 { return this->dynsym_xindex_; }
216 // Return whether a section is a .gnu.linkonce section, given the
217 // section name.
218 static inline bool
219 is_linkonce(const char* name)
220 { return strncmp(name, ".gnu.linkonce", sizeof(".gnu.linkonce") - 1) == 0; }
222 // Return true if a section is a debugging section.
223 static inline bool
224 is_debug_info_section(const char* name)
226 // Debugging sections can only be recognized by name.
227 return (strncmp(name, ".debug", sizeof(".debug") - 1) == 0
228 || strncmp(name, ".gnu.linkonce.wi.",
229 sizeof(".gnu.linkonce.wi.") - 1) == 0
230 || strncmp(name, ".line", sizeof(".line") - 1) == 0
231 || strncmp(name, ".stab", sizeof(".stab") - 1) == 0);
234 // Record the signature of a comdat section, and return whether to
235 // include it in the link. The GROUP parameter is true for a
236 // section group signature, false for a signature derived from a
237 // .gnu.linkonce section.
238 bool
239 add_comdat(Relobj*, unsigned int, const std::string&, bool group);
241 // Find the given comdat signature, and return the object and section
242 // index of the kept group.
243 Relobj*
244 find_kept_object(const std::string&, unsigned int*) const;
246 // Finalize the layout after all the input sections have been added.
247 off_t
248 finalize(const Input_objects*, Symbol_table*, Target*, const Task*);
250 // Return whether any sections require postprocessing.
251 bool
252 any_postprocessing_sections() const
253 { return this->any_postprocessing_sections_; }
255 // Return the size of the output file.
256 off_t
257 output_file_size() const
258 { return this->output_file_size_; }
260 // Return the TLS segment. This will return NULL if there isn't
261 // one.
262 Output_segment*
263 tls_segment() const
264 { return this->tls_segment_; }
266 // Return the normal symbol table.
267 Output_section*
268 symtab_section() const
270 gold_assert(this->symtab_section_ != NULL);
271 return this->symtab_section_;
274 // Return the dynamic symbol table.
275 Output_section*
276 dynsym_section() const
278 gold_assert(this->dynsym_section_ != NULL);
279 return this->dynsym_section_;
282 // Return the dynamic tags.
283 Output_data_dynamic*
284 dynamic_data() const
285 { return this->dynamic_data_; }
287 // Write out the output sections.
288 void
289 write_output_sections(Output_file* of) const;
291 // Write out data not associated with an input file or the symbol
292 // table.
293 void
294 write_data(const Symbol_table*, Output_file*) const;
296 // Write out output sections which can not be written until all the
297 // input sections are complete.
298 void
299 write_sections_after_input_sections(Output_file* of);
301 // Return an output section named NAME, or NULL if there is none.
302 Output_section*
303 find_output_section(const char* name) const;
305 // Return an output segment of type TYPE, with segment flags SET set
306 // and segment flags CLEAR clear. Return NULL if there is none.
307 Output_segment*
308 find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set,
309 elfcpp::Elf_Word clear) const;
311 // Return the number of segments we expect to produce.
312 size_t
313 expected_segment_count() const;
315 // Set a flag to indicate that an object file uses the static TLS model.
316 void
317 set_has_static_tls()
318 { this->has_static_tls_ = true; }
320 // Return true if any object file uses the static TLS model.
321 bool
322 has_static_tls() const
323 { return this->has_static_tls_; }
325 // Return the options which may be set by a linker script.
326 Script_options*
327 script_options()
328 { return this->script_options_; }
330 const Script_options*
331 script_options() const
332 { return this->script_options_; }
334 // Compute and write out the build ID if needed.
335 void
336 write_build_id(Output_file*) const;
338 // Rewrite output file in binary format.
339 void
340 write_binary(Output_file* in) const;
342 // Print output sections to the map file.
343 void
344 print_to_mapfile(Mapfile*) const;
346 // Dump statistical information to stderr.
347 void
348 print_stats() const;
350 // A list of segments.
352 typedef std::vector<Output_segment*> Segment_list;
354 // A list of sections.
356 typedef std::vector<Output_section*> Section_list;
358 // The list of information to write out which is not attached to
359 // either a section or a segment.
360 typedef std::vector<Output_data*> Data_list;
362 // Store the allocated sections into the section list. This is used
363 // by the linker script code.
364 void
365 get_allocated_sections(Section_list*) const;
367 // Make a section for a linker script to hold data.
368 Output_section*
369 make_output_section_for_script(const char* name);
371 // Make a segment. This is used by the linker script code.
372 Output_segment*
373 make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags);
375 // Return the number of segments.
376 size_t
377 segment_count() const
378 { return this->segment_list_.size(); }
380 // Map from section flags to segment flags.
381 static elfcpp::Elf_Word
382 section_flags_to_segment(elfcpp::Elf_Xword flags);
384 // Attach sections to segments.
385 void
386 attach_sections_to_segments();
388 private:
389 Layout(const Layout&);
390 Layout& operator=(const Layout&);
392 // Mapping from .gnu.linkonce section names to output section names.
393 struct Linkonce_mapping
395 const char* from;
396 int fromlen;
397 const char* to;
398 int tolen;
400 static const Linkonce_mapping linkonce_mapping[];
401 static const int linkonce_mapping_count;
403 // During a relocatable link, a list of group sections and
404 // signatures.
405 struct Group_signature
407 // The group section.
408 Output_section* section;
409 // The signature.
410 const char* signature;
412 Group_signature()
413 : section(NULL), signature(NULL)
416 Group_signature(Output_section* sectiona, const char* signaturea)
417 : section(sectiona), signature(signaturea)
420 typedef std::vector<Group_signature> Group_signatures;
422 // Create a .note section, filling in the header.
423 Output_section*
424 create_note(const char* name, int note_type, size_t descsz,
425 bool allocate, size_t* trailing_padding);
427 // Create a .note section for gold.
428 void
429 create_gold_note();
431 // Record whether the stack must be executable.
432 void
433 create_executable_stack_info(const Target*);
435 // Create a build ID note if needed.
436 void
437 create_build_id();
439 // Find the first read-only PT_LOAD segment, creating one if
440 // necessary.
441 Output_segment*
442 find_first_load_seg();
444 // Count the local symbols in the regular symbol table and the dynamic
445 // symbol table, and build the respective string pools.
446 void
447 count_local_symbols(const Task*, const Input_objects*);
449 // Create the output sections for the symbol table.
450 void
451 create_symtab_sections(const Input_objects*, Symbol_table*,
452 unsigned int, off_t*);
454 // Create the .shstrtab section.
455 Output_section*
456 create_shstrtab();
458 // Create the section header table.
459 void
460 create_shdrs(const Output_section* shstrtab_section, off_t*);
462 // Create the dynamic symbol table.
463 void
464 create_dynamic_symtab(const Input_objects*, Symbol_table*,
465 Output_section** pdynstr,
466 unsigned int* plocal_dynamic_count,
467 std::vector<Symbol*>* pdynamic_symbols,
468 Versions* versions);
470 // Assign offsets to each local portion of the dynamic symbol table.
471 void
472 assign_local_dynsym_offsets(const Input_objects*);
474 // Finish the .dynamic section and PT_DYNAMIC segment.
475 void
476 finish_dynamic_section(const Input_objects*, const Symbol_table*);
478 // Create the .interp section and PT_INTERP segment.
479 void
480 create_interp(const Target* target);
482 // Create the version sections.
483 void
484 create_version_sections(const Versions*,
485 const Symbol_table*,
486 unsigned int local_symcount,
487 const std::vector<Symbol*>& dynamic_symbols,
488 const Output_section* dynstr);
490 template<int size, bool big_endian>
491 void
492 sized_create_version_sections(const Versions* versions,
493 const Symbol_table*,
494 unsigned int local_symcount,
495 const std::vector<Symbol*>& dynamic_symbols,
496 const Output_section* dynstr);
498 // Return whether to include this section in the link.
499 template<int size, bool big_endian>
500 bool
501 include_section(Sized_relobj<size, big_endian>* object, const char* name,
502 const elfcpp::Shdr<size, big_endian>&);
504 // Return the output section name to use given an input section
505 // name. Set *PLEN to the length of the name. *PLEN must be
506 // initialized to the length of NAME.
507 static const char*
508 output_section_name(const char* name, size_t* plen);
510 // Return the output section name to use for a linkonce section
511 // name. PLEN is as for output_section_name.
512 static const char*
513 linkonce_output_name(const char* name, size_t* plen);
515 // Return the number of allocated output sections.
516 size_t
517 allocated_output_section_count() const;
519 // Return the output section for NAME, TYPE and FLAGS.
520 Output_section*
521 get_output_section(const char* name, Stringpool::Key name_key,
522 elfcpp::Elf_Word type, elfcpp::Elf_Xword flags);
524 // Choose the output section for NAME in RELOBJ.
525 Output_section*
526 choose_output_section(const Relobj* relobj, const char* name,
527 elfcpp::Elf_Word type, elfcpp::Elf_Xword flags,
528 bool is_input_section);
530 // Create a new Output_section.
531 Output_section*
532 make_output_section(const char* name, elfcpp::Elf_Word type,
533 elfcpp::Elf_Xword flags);
535 // Attach a section to a segment.
536 void
537 attach_section_to_segment(Output_section*);
539 // Attach an allocated section to a segment.
540 void
541 attach_allocated_section_to_segment(Output_section*);
543 // Set the final file offsets of all the segments.
544 off_t
545 set_segment_offsets(const Target*, Output_segment*, unsigned int* pshndx);
547 // Set the file offsets of the sections when doing a relocatable
548 // link.
549 off_t
550 set_relocatable_section_offsets(Output_data*, unsigned int* pshndx);
552 // Set the final file offsets of all the sections not associated
553 // with a segment. We set section offsets in three passes: the
554 // first handles all allocated sections, the second sections that
555 // require postprocessing, and the last the late-bound STRTAB
556 // sections (probably only shstrtab, which is the one we care about
557 // because it holds section names).
558 enum Section_offset_pass
560 BEFORE_INPUT_SECTIONS_PASS,
561 POSTPROCESSING_SECTIONS_PASS,
562 STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS
564 off_t
565 set_section_offsets(off_t, Section_offset_pass pass);
567 // Set the final section indexes of all the sections not associated
568 // with a segment. Returns the next unused index.
569 unsigned int
570 set_section_indexes(unsigned int pshndx);
572 // Set the section addresses when using a script.
573 Output_segment*
574 set_section_addresses_from_script(Symbol_table*);
576 // Return whether SEG1 comes before SEG2 in the output file.
577 static bool
578 segment_precedes(const Output_segment* seg1, const Output_segment* seg2);
580 // A mapping used for group signatures.
581 struct Kept_section
583 Kept_section()
584 : object_(NULL), shndx_(0), group_(false)
586 Kept_section(Relobj* object, unsigned int shndx, bool group)
587 : object_(object), shndx_(shndx), group_(group)
589 Relobj* object_;
590 unsigned int shndx_;
591 bool group_;
593 typedef Unordered_map<std::string, Kept_section> Signatures;
595 // Mapping from input section name/type/flags to output section. We
596 // use canonicalized strings here.
598 typedef std::pair<Stringpool::Key,
599 std::pair<elfcpp::Elf_Word, elfcpp::Elf_Xword> > Key;
601 struct Hash_key
603 size_t
604 operator()(const Key& k) const;
607 typedef Unordered_map<Key, Output_section*, Hash_key> Section_name_map;
609 // A comparison class for segments.
611 struct Compare_segments
613 bool
614 operator()(const Output_segment* seg1, const Output_segment* seg2)
615 { return Layout::segment_precedes(seg1, seg2); }
618 // A reference to the options on the command line.
619 const General_options& options_;
620 // Information set by scripts or by command line options.
621 Script_options* script_options_;
622 // The output section names.
623 Stringpool namepool_;
624 // The output symbol names.
625 Stringpool sympool_;
626 // The dynamic strings, if needed.
627 Stringpool dynpool_;
628 // The list of group sections and linkonce sections which we have seen.
629 Signatures signatures_;
630 // The mapping from input section name/type/flags to output sections.
631 Section_name_map section_name_map_;
632 // The list of output segments.
633 Segment_list segment_list_;
634 // The list of output sections.
635 Section_list section_list_;
636 // The list of output sections which are not attached to any output
637 // segment.
638 Section_list unattached_section_list_;
639 // Whether we have attached the sections to the segments.
640 bool sections_are_attached_;
641 // The list of unattached Output_data objects which require special
642 // handling because they are not Output_sections.
643 Data_list special_output_list_;
644 // The section headers.
645 Output_section_headers* section_headers_;
646 // A pointer to the PT_TLS segment if there is one.
647 Output_segment* tls_segment_;
648 // A pointer to the PT_GNU_RELRO segment if there is one.
649 Output_segment* relro_segment_;
650 // The SHT_SYMTAB output section.
651 Output_section* symtab_section_;
652 // The SHT_SYMTAB_SHNDX for the regular symbol table if there is one.
653 Output_symtab_xindex* symtab_xindex_;
654 // The SHT_DYNSYM output section if there is one.
655 Output_section* dynsym_section_;
656 // The SHT_SYMTAB_SHNDX for the dynamic symbol table if there is one.
657 Output_symtab_xindex* dynsym_xindex_;
658 // The SHT_DYNAMIC output section if there is one.
659 Output_section* dynamic_section_;
660 // The dynamic data which goes into dynamic_section_.
661 Output_data_dynamic* dynamic_data_;
662 // The exception frame output section if there is one.
663 Output_section* eh_frame_section_;
664 // The exception frame data for eh_frame_section_.
665 Eh_frame* eh_frame_data_;
666 // Whether we have added eh_frame_data_ to the .eh_frame section.
667 bool added_eh_frame_data_;
668 // The exception frame header output section if there is one.
669 Output_section* eh_frame_hdr_section_;
670 // The space for the build ID checksum if there is one.
671 Output_section_data* build_id_note_;
672 // The output section containing dwarf abbreviations
673 Output_reduced_debug_abbrev_section* debug_abbrev_;
674 // The output section containing the dwarf debug info tree
675 Output_reduced_debug_info_section* debug_info_;
676 // A list of group sections and their signatures.
677 Group_signatures group_signatures_;
678 // The size of the output file.
679 off_t output_file_size_;
680 // Whether we have seen an object file marked to require an
681 // executable stack.
682 bool input_requires_executable_stack_;
683 // Whether we have seen at least one object file with an executable
684 // stack marker.
685 bool input_with_gnu_stack_note_;
686 // Whether we have seen at least one object file without an
687 // executable stack marker.
688 bool input_without_gnu_stack_note_;
689 // Whether we have seen an object file that uses the static TLS model.
690 bool has_static_tls_;
691 // Whether any sections require postprocessing.
692 bool any_postprocessing_sections_;
695 // This task handles writing out data in output sections which is not
696 // part of an input section, or which requires special handling. When
697 // this is done, it unblocks both output_sections_blocker and
698 // final_blocker.
700 class Write_sections_task : public Task
702 public:
703 Write_sections_task(const Layout* layout, Output_file* of,
704 Task_token* output_sections_blocker,
705 Task_token* final_blocker)
706 : layout_(layout), of_(of),
707 output_sections_blocker_(output_sections_blocker),
708 final_blocker_(final_blocker)
711 // The standard Task methods.
713 Task_token*
714 is_runnable();
716 void
717 locks(Task_locker*);
719 void
720 run(Workqueue*);
722 std::string
723 get_name() const
724 { return "Write_sections_task"; }
726 private:
727 class Write_sections_locker;
729 const Layout* layout_;
730 Output_file* of_;
731 Task_token* output_sections_blocker_;
732 Task_token* final_blocker_;
735 // This task handles writing out data which is not part of a section
736 // or segment.
738 class Write_data_task : public Task
740 public:
741 Write_data_task(const Layout* layout, const Symbol_table* symtab,
742 Output_file* of, Task_token* final_blocker)
743 : layout_(layout), symtab_(symtab), of_(of), final_blocker_(final_blocker)
746 // The standard Task methods.
748 Task_token*
749 is_runnable();
751 void
752 locks(Task_locker*);
754 void
755 run(Workqueue*);
757 std::string
758 get_name() const
759 { return "Write_data_task"; }
761 private:
762 const Layout* layout_;
763 const Symbol_table* symtab_;
764 Output_file* of_;
765 Task_token* final_blocker_;
768 // This task handles writing out the global symbols.
770 class Write_symbols_task : public Task
772 public:
773 Write_symbols_task(const Layout* layout, const Symbol_table* symtab,
774 const Input_objects* input_objects,
775 const Stringpool* sympool, const Stringpool* dynpool,
776 Output_file* of, Task_token* final_blocker)
777 : layout_(layout), symtab_(symtab), input_objects_(input_objects),
778 sympool_(sympool), dynpool_(dynpool), of_(of),
779 final_blocker_(final_blocker)
782 // The standard Task methods.
784 Task_token*
785 is_runnable();
787 void
788 locks(Task_locker*);
790 void
791 run(Workqueue*);
793 std::string
794 get_name() const
795 { return "Write_symbols_task"; }
797 private:
798 const Layout* layout_;
799 const Symbol_table* symtab_;
800 const Input_objects* input_objects_;
801 const Stringpool* sympool_;
802 const Stringpool* dynpool_;
803 Output_file* of_;
804 Task_token* final_blocker_;
807 // This task handles writing out data in output sections which can't
808 // be written out until all the input sections have been handled.
809 // This is for sections whose contents is based on the contents of
810 // other output sections.
812 class Write_after_input_sections_task : public Task
814 public:
815 Write_after_input_sections_task(Layout* layout, Output_file* of,
816 Task_token* input_sections_blocker,
817 Task_token* final_blocker)
818 : layout_(layout), of_(of),
819 input_sections_blocker_(input_sections_blocker),
820 final_blocker_(final_blocker)
823 // The standard Task methods.
825 Task_token*
826 is_runnable();
828 void
829 locks(Task_locker*);
831 void
832 run(Workqueue*);
834 std::string
835 get_name() const
836 { return "Write_after_input_sections_task"; }
838 private:
839 Layout* layout_;
840 Output_file* of_;
841 Task_token* input_sections_blocker_;
842 Task_token* final_blocker_;
845 // This task function handles closing the file.
847 class Close_task_runner : public Task_function_runner
849 public:
850 Close_task_runner(const General_options* options, const Layout* layout,
851 Output_file* of)
852 : options_(options), layout_(layout), of_(of)
855 // Run the operation.
856 void
857 run(Workqueue*, const Task*);
859 private:
860 const General_options* options_;
861 const Layout* layout_;
862 Output_file* of_;
865 // A small helper function to align an address.
867 inline uint64_t
868 align_address(uint64_t address, uint64_t addralign)
870 if (addralign != 0)
871 address = (address + addralign - 1) &~ (addralign - 1);
872 return address;
875 } // End namespace gold.
877 #endif // !defined(GOLD_LAYOUT_H)