1 // output.h -- manage the output file 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.
32 #include "reloc-types.h"
37 class General_options;
41 class Output_merge_base;
43 class Relocatable_relocs;
45 template<int size, bool big_endian>
47 template<int size, bool big_endian>
50 // This class specifies an input section. It is used as a key type
53 class Input_section_specifier
56 Input_section_specifier(const Relobj* relobj, unsigned int shndx)
57 : relobj_(relobj), shndx_(shndx)
60 // Return Relobj of this.
63 { return this->relobj_; }
65 // Return section index of this.
68 { return this->shndx_; }
70 // Whether this equals to another specifier ISS.
72 eq(const Input_section_specifier& iss) const
73 { return this->relobj_ == iss.relobj_ && this->shndx_ == iss.shndx_; }
75 // Compute a hash value of this.
79 return (gold::string_hash<char>(this->relobj_->name().c_str())
83 // Functors for containers.
87 operator()(const Input_section_specifier& iss1,
88 const Input_section_specifier& iss2) const
89 { return iss1.eq(iss2); }
95 operator()(const Input_section_specifier& iss) const
96 { return iss.hash_value(); }
101 const Relobj* relobj_;
106 // An abtract class for data which has to go into the output file.
111 explicit Output_data()
112 : address_(0), data_size_(0), offset_(-1),
113 is_address_valid_(false), is_data_size_valid_(false),
114 is_offset_valid_(false), is_data_size_fixed_(false),
115 dynamic_reloc_count_(0)
121 // Return the address. For allocated sections, this is only valid
122 // after Layout::finalize is finished.
126 gold_assert(this->is_address_valid_);
127 return this->address_;
130 // Return the size of the data. For allocated sections, this must
131 // be valid after Layout::finalize calls set_address, but need not
132 // be valid before then.
136 gold_assert(this->is_data_size_valid_);
137 return this->data_size_;
140 // Return true if data size is fixed.
142 is_data_size_fixed() const
143 { return this->is_data_size_fixed_; }
145 // Return the file offset. This is only valid after
146 // Layout::finalize is finished. For some non-allocated sections,
147 // it may not be valid until near the end of the link.
151 gold_assert(this->is_offset_valid_);
152 return this->offset_;
155 // Reset the address and file offset. This essentially disables the
156 // sanity testing about duplicate and unknown settings.
158 reset_address_and_file_offset()
160 this->is_address_valid_ = false;
161 this->is_offset_valid_ = false;
162 if (!this->is_data_size_fixed_)
163 this->is_data_size_valid_ = false;
164 this->do_reset_address_and_file_offset();
167 // Return true if address and file offset already have reset values. In
168 // other words, calling reset_address_and_file_offset will not change them.
170 address_and_file_offset_have_reset_values() const
171 { return this->do_address_and_file_offset_have_reset_values(); }
173 // Return the required alignment.
176 { return this->do_addralign(); }
178 // Return whether this has a load address.
180 has_load_address() const
181 { return this->do_has_load_address(); }
183 // Return the load address.
186 { return this->do_load_address(); }
188 // Return whether this is an Output_section.
191 { return this->do_is_section(); }
193 // Return whether this is an Output_section of the specified type.
195 is_section_type(elfcpp::Elf_Word stt) const
196 { return this->do_is_section_type(stt); }
198 // Return whether this is an Output_section with the specified flag
201 is_section_flag_set(elfcpp::Elf_Xword shf) const
202 { return this->do_is_section_flag_set(shf); }
204 // Return the output section that this goes in, if there is one.
207 { return this->do_output_section(); }
209 // Return the output section index, if there is an output section.
212 { return this->do_out_shndx(); }
214 // Set the output section index, if this is an output section.
216 set_out_shndx(unsigned int shndx)
217 { this->do_set_out_shndx(shndx); }
219 // Set the address and file offset of this data, and finalize the
220 // size of the data. This is called during Layout::finalize for
221 // allocated sections.
223 set_address_and_file_offset(uint64_t addr, off_t off)
225 this->set_address(addr);
226 this->set_file_offset(off);
227 this->finalize_data_size();
232 set_address(uint64_t addr)
234 gold_assert(!this->is_address_valid_);
235 this->address_ = addr;
236 this->is_address_valid_ = true;
239 // Set the file offset.
241 set_file_offset(off_t off)
243 gold_assert(!this->is_offset_valid_);
245 this->is_offset_valid_ = true;
248 // Finalize the data size.
252 if (!this->is_data_size_valid_)
254 // Tell the child class to set the data size.
255 this->set_final_data_size();
256 gold_assert(this->is_data_size_valid_);
260 // Set the TLS offset. Called only for SHT_TLS sections.
262 set_tls_offset(uint64_t tls_base)
263 { this->do_set_tls_offset(tls_base); }
265 // Return the TLS offset, relative to the base of the TLS segment.
266 // Valid only for SHT_TLS sections.
269 { return this->do_tls_offset(); }
271 // Write the data to the output file. This is called after
272 // Layout::finalize is complete.
274 write(Output_file* file)
275 { this->do_write(file); }
277 // This is called by Layout::finalize to note that the sizes of
278 // allocated sections must now be fixed.
281 { Output_data::allocated_sizes_are_fixed = true; }
283 // Used to check that layout has been done.
286 { return Output_data::allocated_sizes_are_fixed; }
288 // Count the number of dynamic relocations applied to this section.
291 { ++this->dynamic_reloc_count_; }
293 // Return the number of dynamic relocations applied to this section.
295 dynamic_reloc_count() const
296 { return this->dynamic_reloc_count_; }
298 // Whether the address is valid.
300 is_address_valid() const
301 { return this->is_address_valid_; }
303 // Whether the file offset is valid.
305 is_offset_valid() const
306 { return this->is_offset_valid_; }
308 // Whether the data size is valid.
310 is_data_size_valid() const
311 { return this->is_data_size_valid_; }
313 // Print information to the map file.
315 print_to_mapfile(Mapfile* mapfile) const
316 { return this->do_print_to_mapfile(mapfile); }
319 // Functions that child classes may or in some cases must implement.
321 // Write the data to the output file.
323 do_write(Output_file*) = 0;
325 // Return the required alignment.
327 do_addralign() const = 0;
329 // Return whether this has a load address.
331 do_has_load_address() const
334 // Return the load address.
336 do_load_address() const
337 { gold_unreachable(); }
339 // Return whether this is an Output_section.
341 do_is_section() const
344 // Return whether this is an Output_section of the specified type.
345 // This only needs to be implement by Output_section.
347 do_is_section_type(elfcpp::Elf_Word) const
350 // Return whether this is an Output_section with the specific flag
351 // set. This only needs to be implemented by Output_section.
353 do_is_section_flag_set(elfcpp::Elf_Xword) const
356 // Return the output section, if there is one.
357 virtual Output_section*
361 // Return the output section index, if there is an output section.
364 { gold_unreachable(); }
366 // Set the output section index, if this is an output section.
368 do_set_out_shndx(unsigned int)
369 { gold_unreachable(); }
371 // This is a hook for derived classes to set the data size. This is
372 // called by finalize_data_size, normally called during
373 // Layout::finalize, when the section address is set.
375 set_final_data_size()
376 { gold_unreachable(); }
378 // A hook for resetting the address and file offset.
380 do_reset_address_and_file_offset()
383 // Return true if address and file offset already have reset values. In
384 // other words, calling reset_address_and_file_offset will not change them.
385 // A child class overriding do_reset_address_and_file_offset may need to
386 // also override this.
388 do_address_and_file_offset_have_reset_values() const
389 { return !this->is_address_valid_ && !this->is_offset_valid_; }
391 // Set the TLS offset. Called only for SHT_TLS sections.
393 do_set_tls_offset(uint64_t)
394 { gold_unreachable(); }
396 // Return the TLS offset, relative to the base of the TLS segment.
397 // Valid only for SHT_TLS sections.
399 do_tls_offset() const
400 { gold_unreachable(); }
402 // Print to the map file. This only needs to be implemented by
403 // classes which may appear in a PT_LOAD segment.
405 do_print_to_mapfile(Mapfile*) const
406 { gold_unreachable(); }
408 // Functions that child classes may call.
410 // Reset the address. The Output_section class needs this when an
411 // SHF_ALLOC input section is added to an output section which was
412 // formerly not SHF_ALLOC.
414 mark_address_invalid()
415 { this->is_address_valid_ = false; }
417 // Set the size of the data.
419 set_data_size(off_t data_size)
421 gold_assert(!this->is_data_size_valid_
422 && !this->is_data_size_fixed_);
423 this->data_size_ = data_size;
424 this->is_data_size_valid_ = true;
427 // Fix the data size. Once it is fixed, it cannot be changed
428 // and the data size remains always valid.
432 gold_assert(this->is_data_size_valid_);
433 this->is_data_size_fixed_ = true;
436 // Get the current data size--this is for the convenience of
437 // sections which build up their size over time.
439 current_data_size_for_child() const
440 { return this->data_size_; }
442 // Set the current data size--this is for the convenience of
443 // sections which build up their size over time.
445 set_current_data_size_for_child(off_t data_size)
447 gold_assert(!this->is_data_size_valid_);
448 this->data_size_ = data_size;
451 // Return default alignment for the target size.
455 // Return default alignment for a specified size--32 or 64.
457 default_alignment_for_size(int size);
460 Output_data(const Output_data&);
461 Output_data& operator=(const Output_data&);
463 // This is used for verification, to make sure that we don't try to
464 // change any sizes of allocated sections after we set the section
466 static bool allocated_sizes_are_fixed;
468 // Memory address in output file.
470 // Size of data in output file.
472 // File offset of contents in output file.
474 // Whether address_ is valid.
475 bool is_address_valid_;
476 // Whether data_size_ is valid.
477 bool is_data_size_valid_;
478 // Whether offset_ is valid.
479 bool is_offset_valid_;
480 // Whether data size is fixed.
481 bool is_data_size_fixed_;
482 // Count of dynamic relocations applied to this section.
483 unsigned int dynamic_reloc_count_;
486 // Output the section headers.
488 class Output_section_headers : public Output_data
491 Output_section_headers(const Layout*,
492 const Layout::Segment_list*,
493 const Layout::Section_list*,
494 const Layout::Section_list*,
496 const Output_section*);
499 // Write the data to the file.
501 do_write(Output_file*);
503 // Return the required alignment.
506 { return Output_data::default_alignment(); }
508 // Write to a map file.
510 do_print_to_mapfile(Mapfile* mapfile) const
511 { mapfile->print_output_data(this, _("** section headers")); }
513 // Set final data size.
515 set_final_data_size()
516 { this->set_data_size(this->do_size()); }
519 // Write the data to the file with the right size and endianness.
520 template<int size, bool big_endian>
522 do_sized_write(Output_file*);
524 // Compute data size.
528 const Layout* layout_;
529 const Layout::Segment_list* segment_list_;
530 const Layout::Section_list* section_list_;
531 const Layout::Section_list* unattached_section_list_;
532 const Stringpool* secnamepool_;
533 const Output_section* shstrtab_section_;
536 // Output the segment headers.
538 class Output_segment_headers : public Output_data
541 Output_segment_headers(const Layout::Segment_list& segment_list);
544 // Write the data to the file.
546 do_write(Output_file*);
548 // Return the required alignment.
551 { return Output_data::default_alignment(); }
553 // Write to a map file.
555 do_print_to_mapfile(Mapfile* mapfile) const
556 { mapfile->print_output_data(this, _("** segment headers")); }
558 // Set final data size.
560 set_final_data_size()
561 { this->set_data_size(this->do_size()); }
564 // Write the data to the file with the right size and endianness.
565 template<int size, bool big_endian>
567 do_sized_write(Output_file*);
569 // Compute the current size.
573 const Layout::Segment_list& segment_list_;
576 // Output the ELF file header.
578 class Output_file_header : public Output_data
581 Output_file_header(const Target*,
583 const Output_segment_headers*,
586 // Add information about the section headers. We lay out the ELF
587 // file header before we create the section headers.
588 void set_section_info(const Output_section_headers*,
589 const Output_section* shstrtab);
592 // Write the data to the file.
594 do_write(Output_file*);
596 // Return the required alignment.
599 { return Output_data::default_alignment(); }
601 // Write to a map file.
603 do_print_to_mapfile(Mapfile* mapfile) const
604 { mapfile->print_output_data(this, _("** file header")); }
606 // Set final data size.
608 set_final_data_size(void)
609 { this->set_data_size(this->do_size()); }
612 // Write the data to the file with the right size and endianness.
613 template<int size, bool big_endian>
615 do_sized_write(Output_file*);
617 // Return the value to use for the entry address.
619 typename elfcpp::Elf_types<size>::Elf_Addr
622 // Compute the current data size.
626 const Target* target_;
627 const Symbol_table* symtab_;
628 const Output_segment_headers* segment_header_;
629 const Output_section_headers* section_header_;
630 const Output_section* shstrtab_;
634 // Output sections are mainly comprised of input sections. However,
635 // there are cases where we have data to write out which is not in an
636 // input section. Output_section_data is used in such cases. This is
637 // an abstract base class.
639 class Output_section_data : public Output_data
642 Output_section_data(off_t data_size, uint64_t addralign,
643 bool is_data_size_fixed)
644 : Output_data(), output_section_(NULL), addralign_(addralign)
646 this->set_data_size(data_size);
647 if (is_data_size_fixed)
648 this->fix_data_size();
651 Output_section_data(uint64_t addralign)
652 : Output_data(), output_section_(NULL), addralign_(addralign)
655 // Return the output section.
656 const Output_section*
657 output_section() const
658 { return this->output_section_; }
660 // Record the output section.
662 set_output_section(Output_section* os);
664 // Add an input section, for SHF_MERGE sections. This returns true
665 // if the section was handled.
667 add_input_section(Relobj* object, unsigned int shndx)
668 { return this->do_add_input_section(object, shndx); }
670 // Given an input OBJECT, an input section index SHNDX within that
671 // object, and an OFFSET relative to the start of that input
672 // section, return whether or not the corresponding offset within
673 // the output section is known. If this function returns true, it
674 // sets *POUTPUT to the output offset. The value -1 indicates that
675 // this input offset is being discarded.
677 output_offset(const Relobj* object, unsigned int shndx,
678 section_offset_type offset,
679 section_offset_type *poutput) const
680 { return this->do_output_offset(object, shndx, offset, poutput); }
682 // Return whether this is the merge section for the input section
683 // SHNDX in OBJECT. This should return true when output_offset
684 // would return true for some values of OFFSET.
686 is_merge_section_for(const Relobj* object, unsigned int shndx) const
687 { return this->do_is_merge_section_for(object, shndx); }
689 // Write the contents to a buffer. This is used for sections which
690 // require postprocessing, such as compression.
692 write_to_buffer(unsigned char* buffer)
693 { this->do_write_to_buffer(buffer); }
695 // Print merge stats to stderr. This should only be called for
696 // SHF_MERGE sections.
698 print_merge_stats(const char* section_name)
699 { this->do_print_merge_stats(section_name); }
702 // The child class must implement do_write.
704 // The child class may implement specific adjustments to the output
707 do_adjust_output_section(Output_section*)
710 // May be implemented by child class. Return true if the section
713 do_add_input_section(Relobj*, unsigned int)
714 { gold_unreachable(); }
716 // The child class may implement output_offset.
718 do_output_offset(const Relobj*, unsigned int, section_offset_type,
719 section_offset_type*) const
722 // The child class may implement is_merge_section_for.
724 do_is_merge_section_for(const Relobj*, unsigned int) const
727 // The child class may implement write_to_buffer. Most child
728 // classes can not appear in a compressed section, and they do not
731 do_write_to_buffer(unsigned char*)
732 { gold_unreachable(); }
734 // Print merge statistics.
736 do_print_merge_stats(const char*)
737 { gold_unreachable(); }
739 // Return the required alignment.
742 { return this->addralign_; }
744 // Return the output section.
747 { return this->output_section_; }
749 // Return the section index of the output section.
751 do_out_shndx() const;
753 // Set the alignment.
755 set_addralign(uint64_t addralign);
758 // The output section for this section.
759 Output_section* output_section_;
760 // The required alignment.
764 // Some Output_section_data classes build up their data step by step,
765 // rather than all at once. This class provides an interface for
768 class Output_section_data_build : public Output_section_data
771 Output_section_data_build(uint64_t addralign)
772 : Output_section_data(addralign)
775 // Get the current data size.
777 current_data_size() const
778 { return this->current_data_size_for_child(); }
780 // Set the current data size.
782 set_current_data_size(off_t data_size)
783 { this->set_current_data_size_for_child(data_size); }
786 // Set the final data size.
788 set_final_data_size()
789 { this->set_data_size(this->current_data_size_for_child()); }
792 // A simple case of Output_data in which we have constant data to
795 class Output_data_const : public Output_section_data
798 Output_data_const(const std::string& data, uint64_t addralign)
799 : Output_section_data(data.size(), addralign, true), data_(data)
802 Output_data_const(const char* p, off_t len, uint64_t addralign)
803 : Output_section_data(len, addralign, true), data_(p, len)
806 Output_data_const(const unsigned char* p, off_t len, uint64_t addralign)
807 : Output_section_data(len, addralign, true),
808 data_(reinterpret_cast<const char*>(p), len)
812 // Write the data to the output file.
814 do_write(Output_file*);
816 // Write the data to a buffer.
818 do_write_to_buffer(unsigned char* buffer)
819 { memcpy(buffer, this->data_.data(), this->data_.size()); }
821 // Write to a map file.
823 do_print_to_mapfile(Mapfile* mapfile) const
824 { mapfile->print_output_data(this, _("** fill")); }
830 // Another version of Output_data with constant data, in which the
831 // buffer is allocated by the caller.
833 class Output_data_const_buffer : public Output_section_data
836 Output_data_const_buffer(const unsigned char* p, off_t len,
837 uint64_t addralign, const char* map_name)
838 : Output_section_data(len, addralign, true),
839 p_(p), map_name_(map_name)
843 // Write the data the output file.
845 do_write(Output_file*);
847 // Write the data to a buffer.
849 do_write_to_buffer(unsigned char* buffer)
850 { memcpy(buffer, this->p_, this->data_size()); }
852 // Write to a map file.
854 do_print_to_mapfile(Mapfile* mapfile) const
855 { mapfile->print_output_data(this, _(this->map_name_)); }
858 // The data to output.
859 const unsigned char* p_;
860 // Name to use in a map file. Maps are a rarely used feature, but
861 // the space usage is minor as aren't very many of these objects.
862 const char* map_name_;
865 // A place holder for a fixed amount of data written out via some
868 class Output_data_fixed_space : public Output_section_data
871 Output_data_fixed_space(off_t data_size, uint64_t addralign,
872 const char* map_name)
873 : Output_section_data(data_size, addralign, true),
878 // Write out the data--the actual data must be written out
881 do_write(Output_file*)
884 // Write to a map file.
886 do_print_to_mapfile(Mapfile* mapfile) const
887 { mapfile->print_output_data(this, _(this->map_name_)); }
890 // Name to use in a map file. Maps are a rarely used feature, but
891 // the space usage is minor as aren't very many of these objects.
892 const char* map_name_;
895 // A place holder for variable sized data written out via some other
898 class Output_data_space : public Output_section_data_build
901 explicit Output_data_space(uint64_t addralign, const char* map_name)
902 : Output_section_data_build(addralign),
906 // Set the alignment.
908 set_space_alignment(uint64_t align)
909 { this->set_addralign(align); }
912 // Write out the data--the actual data must be written out
915 do_write(Output_file*)
918 // Write to a map file.
920 do_print_to_mapfile(Mapfile* mapfile) const
921 { mapfile->print_output_data(this, _(this->map_name_)); }
924 // Name to use in a map file. Maps are a rarely used feature, but
925 // the space usage is minor as aren't very many of these objects.
926 const char* map_name_;
929 // Fill fixed space with zeroes. This is just like
930 // Output_data_fixed_space, except that the map name is known.
932 class Output_data_zero_fill : public Output_section_data
935 Output_data_zero_fill(off_t data_size, uint64_t addralign)
936 : Output_section_data(data_size, addralign, true)
940 // There is no data to write out.
942 do_write(Output_file*)
945 // Write to a map file.
947 do_print_to_mapfile(Mapfile* mapfile) const
948 { mapfile->print_output_data(this, "** zero fill"); }
951 // A string table which goes into an output section.
953 class Output_data_strtab : public Output_section_data
956 Output_data_strtab(Stringpool* strtab)
957 : Output_section_data(1), strtab_(strtab)
961 // This is called to set the address and file offset. Here we make
962 // sure that the Stringpool is finalized.
964 set_final_data_size();
966 // Write out the data.
968 do_write(Output_file*);
970 // Write the data to a buffer.
972 do_write_to_buffer(unsigned char* buffer)
973 { this->strtab_->write_to_buffer(buffer, this->data_size()); }
975 // Write to a map file.
977 do_print_to_mapfile(Mapfile* mapfile) const
978 { mapfile->print_output_data(this, _("** string table")); }
984 // This POD class is used to represent a single reloc in the output
985 // file. This could be a private class within Output_data_reloc, but
986 // the templatization is complex enough that I broke it out into a
987 // separate class. The class is templatized on either elfcpp::SHT_REL
988 // or elfcpp::SHT_RELA, and also on whether this is a dynamic
989 // relocation or an ordinary relocation.
991 // A relocation can be against a global symbol, a local symbol, a
992 // local section symbol, an output section, or the undefined symbol at
993 // index 0. We represent the latter by using a NULL global symbol.
995 template<int sh_type, bool dynamic, int size, bool big_endian>
998 template<bool dynamic, int size, bool big_endian>
999 class Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>
1002 typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
1003 typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend;
1005 static const Address invalid_address = static_cast<Address>(0) - 1;
1007 // An uninitialized entry. We need this because we want to put
1008 // instances of this class into an STL container.
1010 : local_sym_index_(INVALID_CODE)
1013 // We have a bunch of different constructors. They come in pairs
1014 // depending on how the address of the relocation is specified. It
1015 // can either be an offset in an Output_data or an offset in an
1018 // A reloc against a global symbol.
1020 Output_reloc(Symbol* gsym, unsigned int type, Output_data* od,
1021 Address address, bool is_relative);
1023 Output_reloc(Symbol* gsym, unsigned int type,
1024 Sized_relobj<size, big_endian>* relobj,
1025 unsigned int shndx, Address address, bool is_relative);
1027 // A reloc against a local symbol or local section symbol.
1029 Output_reloc(Sized_relobj<size, big_endian>* relobj,
1030 unsigned int local_sym_index, unsigned int type,
1031 Output_data* od, Address address, bool is_relative,
1032 bool is_section_symbol);
1034 Output_reloc(Sized_relobj<size, big_endian>* relobj,
1035 unsigned int local_sym_index, unsigned int type,
1036 unsigned int shndx, Address address, bool is_relative,
1037 bool is_section_symbol);
1039 // A reloc against the STT_SECTION symbol of an output section.
1041 Output_reloc(Output_section* os, unsigned int type, Output_data* od,
1044 Output_reloc(Output_section* os, unsigned int type,
1045 Sized_relobj<size, big_endian>* relobj,
1046 unsigned int shndx, Address address);
1048 // Return TRUE if this is a RELATIVE relocation.
1051 { return this->is_relative_; }
1053 // Return whether this is against a local section symbol.
1055 is_local_section_symbol() const
1057 return (this->local_sym_index_ != GSYM_CODE
1058 && this->local_sym_index_ != SECTION_CODE
1059 && this->local_sym_index_ != INVALID_CODE
1060 && this->is_section_symbol_);
1063 // For a local section symbol, return the offset of the input
1064 // section within the output section. ADDEND is the addend being
1065 // applied to the input section.
1067 local_section_offset(Addend addend) const;
1069 // Get the value of the symbol referred to by a Rel relocation when
1070 // we are adding the given ADDEND.
1072 symbol_value(Addend addend) const;
1074 // Write the reloc entry to an output view.
1076 write(unsigned char* pov) const;
1078 // Write the offset and info fields to Write_rel.
1079 template<typename Write_rel>
1080 void write_rel(Write_rel*) const;
1082 // This is used when sorting dynamic relocs. Return -1 to sort this
1083 // reloc before R2, 0 to sort the same as R2, 1 to sort after R2.
1085 compare(const Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>& r2)
1088 // Return whether this reloc should be sorted before the argument
1089 // when sorting dynamic relocs.
1091 sort_before(const Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>&
1093 { return this->compare(r2) < 0; }
1096 // Record that we need a dynamic symbol index.
1098 set_needs_dynsym_index();
1100 // Return the symbol index.
1102 get_symbol_index() const;
1104 // Return the output address.
1106 get_address() const;
1108 // Codes for local_sym_index_.
1115 // Invalid uninitialized entry.
1121 // For a local symbol or local section symbol
1122 // (this->local_sym_index_ >= 0), the object. We will never
1123 // generate a relocation against a local symbol in a dynamic
1124 // object; that doesn't make sense. And our callers will always
1125 // be templatized, so we use Sized_relobj here.
1126 Sized_relobj<size, big_endian>* relobj;
1127 // For a global symbol (this->local_sym_index_ == GSYM_CODE, the
1128 // symbol. If this is NULL, it indicates a relocation against the
1129 // undefined 0 symbol.
1131 // For a relocation against an output section
1132 // (this->local_sym_index_ == SECTION_CODE), the output section.
1137 // If this->shndx_ is not INVALID CODE, the object which holds the
1138 // input section being used to specify the reloc address.
1139 Sized_relobj<size, big_endian>* relobj;
1140 // If this->shndx_ is INVALID_CODE, the output data being used to
1141 // specify the reloc address. This may be NULL if the reloc
1142 // address is absolute.
1145 // The address offset within the input section or the Output_data.
1147 // This is GSYM_CODE for a global symbol, or SECTION_CODE for a
1148 // relocation against an output section, or INVALID_CODE for an
1149 // uninitialized value. Otherwise, for a local symbol
1150 // (this->is_section_symbol_ is false), the local symbol index. For
1151 // a local section symbol (this->is_section_symbol_ is true), the
1152 // section index in the input file.
1153 unsigned int local_sym_index_;
1154 // The reloc type--a processor specific code.
1155 unsigned int type_ : 30;
1156 // True if the relocation is a RELATIVE relocation.
1157 bool is_relative_ : 1;
1158 // True if the relocation is against a section symbol.
1159 bool is_section_symbol_ : 1;
1160 // If the reloc address is an input section in an object, the
1161 // section index. This is INVALID_CODE if the reloc address is
1162 // specified in some other way.
1163 unsigned int shndx_;
1166 // The SHT_RELA version of Output_reloc<>. This is just derived from
1167 // the SHT_REL version of Output_reloc, but it adds an addend.
1169 template<bool dynamic, int size, bool big_endian>
1170 class Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>
1173 typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
1174 typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend;
1176 // An uninitialized entry.
1181 // A reloc against a global symbol.
1183 Output_reloc(Symbol* gsym, unsigned int type, Output_data* od,
1184 Address address, Addend addend, bool is_relative)
1185 : rel_(gsym, type, od, address, is_relative), addend_(addend)
1188 Output_reloc(Symbol* gsym, unsigned int type,
1189 Sized_relobj<size, big_endian>* relobj,
1190 unsigned int shndx, Address address, Addend addend,
1192 : rel_(gsym, type, relobj, shndx, address, is_relative), addend_(addend)
1195 // A reloc against a local symbol.
1197 Output_reloc(Sized_relobj<size, big_endian>* relobj,
1198 unsigned int local_sym_index, unsigned int type,
1199 Output_data* od, Address address,
1200 Addend addend, bool is_relative, bool is_section_symbol)
1201 : rel_(relobj, local_sym_index, type, od, address, is_relative,
1206 Output_reloc(Sized_relobj<size, big_endian>* relobj,
1207 unsigned int local_sym_index, unsigned int type,
1208 unsigned int shndx, Address address,
1209 Addend addend, bool is_relative, bool is_section_symbol)
1210 : rel_(relobj, local_sym_index, type, shndx, address, is_relative,
1215 // A reloc against the STT_SECTION symbol of an output section.
1217 Output_reloc(Output_section* os, unsigned int type, Output_data* od,
1218 Address address, Addend addend)
1219 : rel_(os, type, od, address), addend_(addend)
1222 Output_reloc(Output_section* os, unsigned int type,
1223 Sized_relobj<size, big_endian>* relobj,
1224 unsigned int shndx, Address address, Addend addend)
1225 : rel_(os, type, relobj, shndx, address), addend_(addend)
1228 // Write the reloc entry to an output view.
1230 write(unsigned char* pov) const;
1232 // Return whether this reloc should be sorted before the argument
1233 // when sorting dynamic relocs.
1235 sort_before(const Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>&
1238 int i = this->rel_.compare(r2.rel_);
1244 return this->addend_ < r2.addend_;
1249 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian> rel_;
1254 // Output_data_reloc is used to manage a section containing relocs.
1255 // SH_TYPE is either elfcpp::SHT_REL or elfcpp::SHT_RELA. DYNAMIC
1256 // indicates whether this is a dynamic relocation or a normal
1257 // relocation. Output_data_reloc_base is a base class.
1258 // Output_data_reloc is the real class, which we specialize based on
1261 template<int sh_type, bool dynamic, int size, bool big_endian>
1262 class Output_data_reloc_base : public Output_section_data_build
1265 typedef Output_reloc<sh_type, dynamic, size, big_endian> Output_reloc_type;
1266 typedef typename Output_reloc_type::Address Address;
1267 static const int reloc_size =
1268 Reloc_types<sh_type, size, big_endian>::reloc_size;
1270 // Construct the section.
1271 Output_data_reloc_base(bool sort_relocs)
1272 : Output_section_data_build(Output_data::default_alignment_for_size(size)),
1273 sort_relocs_(sort_relocs)
1277 // Write out the data.
1279 do_write(Output_file*);
1281 // Set the entry size and the link.
1283 do_adjust_output_section(Output_section *os);
1285 // Write to a map file.
1287 do_print_to_mapfile(Mapfile* mapfile) const
1289 mapfile->print_output_data(this,
1291 ? _("** dynamic relocs")
1295 // Add a relocation entry.
1297 add(Output_data *od, const Output_reloc_type& reloc)
1299 this->relocs_.push_back(reloc);
1300 this->set_current_data_size(this->relocs_.size() * reloc_size);
1301 od->add_dynamic_reloc();
1305 typedef std::vector<Output_reloc_type> Relocs;
1307 // The class used to sort the relocations.
1308 struct Sort_relocs_comparison
1311 operator()(const Output_reloc_type& r1, const Output_reloc_type& r2) const
1312 { return r1.sort_before(r2); }
1315 // The relocations in this section.
1317 // Whether to sort the relocations when writing them out, to make
1318 // the dynamic linker more efficient.
1322 // The class which callers actually create.
1324 template<int sh_type, bool dynamic, int size, bool big_endian>
1325 class Output_data_reloc;
1327 // The SHT_REL version of Output_data_reloc.
1329 template<bool dynamic, int size, bool big_endian>
1330 class Output_data_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>
1331 : public Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian>
1334 typedef Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size,
1338 typedef typename Base::Output_reloc_type Output_reloc_type;
1339 typedef typename Output_reloc_type::Address Address;
1341 Output_data_reloc(bool sr)
1342 : Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian>(sr)
1345 // Add a reloc against a global symbol.
1348 add_global(Symbol* gsym, unsigned int type, Output_data* od, Address address)
1349 { this->add(od, Output_reloc_type(gsym, type, od, address, false)); }
1352 add_global(Symbol* gsym, unsigned int type, Output_data* od,
1353 Sized_relobj<size, big_endian>* relobj,
1354 unsigned int shndx, Address address)
1355 { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
1358 // These are to simplify the Copy_relocs class.
1361 add_global(Symbol* gsym, unsigned int type, Output_data* od, Address address,
1364 gold_assert(addend == 0);
1365 this->add_global(gsym, type, od, address);
1369 add_global(Symbol* gsym, unsigned int type, Output_data* od,
1370 Sized_relobj<size, big_endian>* relobj,
1371 unsigned int shndx, Address address, Address addend)
1373 gold_assert(addend == 0);
1374 this->add_global(gsym, type, od, relobj, shndx, address);
1377 // Add a RELATIVE reloc against a global symbol. The final relocation
1378 // will not reference the symbol.
1381 add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
1383 { this->add(od, Output_reloc_type(gsym, type, od, address, true)); }
1386 add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
1387 Sized_relobj<size, big_endian>* relobj,
1388 unsigned int shndx, Address address)
1390 this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
1394 // Add a reloc against a local symbol.
1397 add_local(Sized_relobj<size, big_endian>* relobj,
1398 unsigned int local_sym_index, unsigned int type,
1399 Output_data* od, Address address)
1401 this->add(od, Output_reloc_type(relobj, local_sym_index, type, od,
1402 address, false, false));
1406 add_local(Sized_relobj<size, big_endian>* relobj,
1407 unsigned int local_sym_index, unsigned int type,
1408 Output_data* od, unsigned int shndx, Address address)
1410 this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
1411 address, false, false));
1414 // Add a RELATIVE reloc against a local symbol.
1417 add_local_relative(Sized_relobj<size, big_endian>* relobj,
1418 unsigned int local_sym_index, unsigned int type,
1419 Output_data* od, Address address)
1421 this->add(od, Output_reloc_type(relobj, local_sym_index, type, od,
1422 address, true, false));
1426 add_local_relative(Sized_relobj<size, big_endian>* relobj,
1427 unsigned int local_sym_index, unsigned int type,
1428 Output_data* od, unsigned int shndx, Address address)
1430 this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
1431 address, true, false));
1434 // Add a reloc against a local section symbol. This will be
1435 // converted into a reloc against the STT_SECTION symbol of the
1439 add_local_section(Sized_relobj<size, big_endian>* relobj,
1440 unsigned int input_shndx, unsigned int type,
1441 Output_data* od, Address address)
1443 this->add(od, Output_reloc_type(relobj, input_shndx, type, od,
1444 address, false, true));
1448 add_local_section(Sized_relobj<size, big_endian>* relobj,
1449 unsigned int input_shndx, unsigned int type,
1450 Output_data* od, unsigned int shndx, Address address)
1452 this->add(od, Output_reloc_type(relobj, input_shndx, type, shndx,
1453 address, false, true));
1456 // A reloc against the STT_SECTION symbol of an output section.
1457 // OS is the Output_section that the relocation refers to; OD is
1458 // the Output_data object being relocated.
1461 add_output_section(Output_section* os, unsigned int type,
1462 Output_data* od, Address address)
1463 { this->add(od, Output_reloc_type(os, type, od, address)); }
1466 add_output_section(Output_section* os, unsigned int type, Output_data* od,
1467 Sized_relobj<size, big_endian>* relobj,
1468 unsigned int shndx, Address address)
1469 { this->add(od, Output_reloc_type(os, type, relobj, shndx, address)); }
1472 // The SHT_RELA version of Output_data_reloc.
1474 template<bool dynamic, int size, bool big_endian>
1475 class Output_data_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>
1476 : public Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian>
1479 typedef Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size,
1483 typedef typename Base::Output_reloc_type Output_reloc_type;
1484 typedef typename Output_reloc_type::Address Address;
1485 typedef typename Output_reloc_type::Addend Addend;
1487 Output_data_reloc(bool sr)
1488 : Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian>(sr)
1491 // Add a reloc against a global symbol.
1494 add_global(Symbol* gsym, unsigned int type, Output_data* od,
1495 Address address, Addend addend)
1496 { this->add(od, Output_reloc_type(gsym, type, od, address, addend,
1500 add_global(Symbol* gsym, unsigned int type, Output_data* od,
1501 Sized_relobj<size, big_endian>* relobj,
1502 unsigned int shndx, Address address,
1504 { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
1507 // Add a RELATIVE reloc against a global symbol. The final output
1508 // relocation will not reference the symbol, but we must keep the symbol
1509 // information long enough to set the addend of the relocation correctly
1510 // when it is written.
1513 add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
1514 Address address, Addend addend)
1515 { this->add(od, Output_reloc_type(gsym, type, od, address, addend, true)); }
1518 add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
1519 Sized_relobj<size, big_endian>* relobj,
1520 unsigned int shndx, Address address, Addend addend)
1521 { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
1524 // Add a reloc against a local symbol.
1527 add_local(Sized_relobj<size, big_endian>* relobj,
1528 unsigned int local_sym_index, unsigned int type,
1529 Output_data* od, Address address, Addend addend)
1531 this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address,
1532 addend, false, false));
1536 add_local(Sized_relobj<size, big_endian>* relobj,
1537 unsigned int local_sym_index, unsigned int type,
1538 Output_data* od, unsigned int shndx, Address address,
1541 this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
1542 address, addend, false, false));
1545 // Add a RELATIVE reloc against a local symbol.
1548 add_local_relative(Sized_relobj<size, big_endian>* relobj,
1549 unsigned int local_sym_index, unsigned int type,
1550 Output_data* od, Address address, Addend addend)
1552 this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address,
1553 addend, true, false));
1557 add_local_relative(Sized_relobj<size, big_endian>* relobj,
1558 unsigned int local_sym_index, unsigned int type,
1559 Output_data* od, unsigned int shndx, Address address,
1562 this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
1563 address, addend, true, false));
1566 // Add a reloc against a local section symbol. This will be
1567 // converted into a reloc against the STT_SECTION symbol of the
1571 add_local_section(Sized_relobj<size, big_endian>* relobj,
1572 unsigned int input_shndx, unsigned int type,
1573 Output_data* od, Address address, Addend addend)
1575 this->add(od, Output_reloc_type(relobj, input_shndx, type, od, address,
1576 addend, false, true));
1580 add_local_section(Sized_relobj<size, big_endian>* relobj,
1581 unsigned int input_shndx, unsigned int type,
1582 Output_data* od, unsigned int shndx, Address address,
1585 this->add(od, Output_reloc_type(relobj, input_shndx, type, shndx,
1586 address, addend, false, true));
1589 // A reloc against the STT_SECTION symbol of an output section.
1592 add_output_section(Output_section* os, unsigned int type, Output_data* od,
1593 Address address, Addend addend)
1594 { this->add(os, Output_reloc_type(os, type, od, address, addend)); }
1597 add_output_section(Output_section* os, unsigned int type,
1598 Sized_relobj<size, big_endian>* relobj,
1599 unsigned int shndx, Address address, Addend addend)
1600 { this->add(os, Output_reloc_type(os, type, relobj, shndx, address,
1604 // Output_relocatable_relocs represents a relocation section in a
1605 // relocatable link. The actual data is written out in the target
1606 // hook relocate_for_relocatable. This just saves space for it.
1608 template<int sh_type, int size, bool big_endian>
1609 class Output_relocatable_relocs : public Output_section_data
1612 Output_relocatable_relocs(Relocatable_relocs* rr)
1613 : Output_section_data(Output_data::default_alignment_for_size(size)),
1618 set_final_data_size();
1620 // Write out the data. There is nothing to do here.
1622 do_write(Output_file*)
1625 // Write to a map file.
1627 do_print_to_mapfile(Mapfile* mapfile) const
1628 { mapfile->print_output_data(this, _("** relocs")); }
1631 // The relocs associated with this input section.
1632 Relocatable_relocs* rr_;
1635 // Handle a GROUP section.
1637 template<int size, bool big_endian>
1638 class Output_data_group : public Output_section_data
1641 // The constructor clears *INPUT_SHNDXES.
1642 Output_data_group(Sized_relobj<size, big_endian>* relobj,
1643 section_size_type entry_count,
1644 elfcpp::Elf_Word flags,
1645 std::vector<unsigned int>* input_shndxes);
1648 do_write(Output_file*);
1650 // Write to a map file.
1652 do_print_to_mapfile(Mapfile* mapfile) const
1653 { mapfile->print_output_data(this, _("** group")); }
1655 // Set final data size.
1657 set_final_data_size()
1658 { this->set_data_size((this->input_shndxes_.size() + 1) * 4); }
1661 // The input object.
1662 Sized_relobj<size, big_endian>* relobj_;
1663 // The group flag word.
1664 elfcpp::Elf_Word flags_;
1665 // The section indexes of the input sections in this group.
1666 std::vector<unsigned int> input_shndxes_;
1669 // Output_data_got is used to manage a GOT. Each entry in the GOT is
1670 // for one symbol--either a global symbol or a local symbol in an
1671 // object. The target specific code adds entries to the GOT as
1674 template<int size, bool big_endian>
1675 class Output_data_got : public Output_section_data_build
1678 typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype;
1679 typedef Output_data_reloc<elfcpp::SHT_REL, true, size, big_endian> Rel_dyn;
1680 typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Rela_dyn;
1683 : Output_section_data_build(Output_data::default_alignment_for_size(size)),
1687 // Add an entry for a global symbol to the GOT. Return true if this
1688 // is a new GOT entry, false if the symbol was already in the GOT.
1690 add_global(Symbol* gsym, unsigned int got_type);
1692 // Add an entry for a global symbol to the GOT, and add a dynamic
1693 // relocation of type R_TYPE for the GOT entry.
1695 add_global_with_rel(Symbol* gsym, unsigned int got_type,
1696 Rel_dyn* rel_dyn, unsigned int r_type);
1699 add_global_with_rela(Symbol* gsym, unsigned int got_type,
1700 Rela_dyn* rela_dyn, unsigned int r_type);
1702 // Add a pair of entries for a global symbol to the GOT, and add
1703 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
1705 add_global_pair_with_rel(Symbol* gsym, unsigned int got_type,
1706 Rel_dyn* rel_dyn, unsigned int r_type_1,
1707 unsigned int r_type_2);
1710 add_global_pair_with_rela(Symbol* gsym, unsigned int got_type,
1711 Rela_dyn* rela_dyn, unsigned int r_type_1,
1712 unsigned int r_type_2);
1714 // Add an entry for a local symbol to the GOT. This returns true if
1715 // this is a new GOT entry, false if the symbol already has a GOT
1718 add_local(Sized_relobj<size, big_endian>* object, unsigned int sym_index,
1719 unsigned int got_type);
1721 // Add an entry for a local symbol to the GOT, and add a dynamic
1722 // relocation of type R_TYPE for the GOT entry.
1724 add_local_with_rel(Sized_relobj<size, big_endian>* object,
1725 unsigned int sym_index, unsigned int got_type,
1726 Rel_dyn* rel_dyn, unsigned int r_type);
1729 add_local_with_rela(Sized_relobj<size, big_endian>* object,
1730 unsigned int sym_index, unsigned int got_type,
1731 Rela_dyn* rela_dyn, unsigned int r_type);
1733 // Add a pair of entries for a local symbol to the GOT, and add
1734 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
1736 add_local_pair_with_rel(Sized_relobj<size, big_endian>* object,
1737 unsigned int sym_index, unsigned int shndx,
1738 unsigned int got_type, Rel_dyn* rel_dyn,
1739 unsigned int r_type_1, unsigned int r_type_2);
1742 add_local_pair_with_rela(Sized_relobj<size, big_endian>* object,
1743 unsigned int sym_index, unsigned int shndx,
1744 unsigned int got_type, Rela_dyn* rela_dyn,
1745 unsigned int r_type_1, unsigned int r_type_2);
1747 // Add a constant to the GOT. This returns the offset of the new
1748 // entry from the start of the GOT.
1750 add_constant(Valtype constant)
1752 this->entries_.push_back(Got_entry(constant));
1753 this->set_got_size();
1754 return this->last_got_offset();
1758 // Write out the GOT table.
1760 do_write(Output_file*);
1762 // Write to a map file.
1764 do_print_to_mapfile(Mapfile* mapfile) const
1765 { mapfile->print_output_data(this, _("** GOT")); }
1768 // This POD class holds a single GOT entry.
1772 // Create a zero entry.
1774 : local_sym_index_(CONSTANT_CODE)
1775 { this->u_.constant = 0; }
1777 // Create a global symbol entry.
1778 explicit Got_entry(Symbol* gsym)
1779 : local_sym_index_(GSYM_CODE)
1780 { this->u_.gsym = gsym; }
1782 // Create a local symbol entry.
1783 Got_entry(Sized_relobj<size, big_endian>* object,
1784 unsigned int local_sym_index)
1785 : local_sym_index_(local_sym_index)
1787 gold_assert(local_sym_index != GSYM_CODE
1788 && local_sym_index != CONSTANT_CODE);
1789 this->u_.object = object;
1792 // Create a constant entry. The constant is a host value--it will
1793 // be swapped, if necessary, when it is written out.
1794 explicit Got_entry(Valtype constant)
1795 : local_sym_index_(CONSTANT_CODE)
1796 { this->u_.constant = constant; }
1798 // Write the GOT entry to an output view.
1800 write(unsigned char* pov) const;
1811 // For a local symbol, the object.
1812 Sized_relobj<size, big_endian>* object;
1813 // For a global symbol, the symbol.
1815 // For a constant, the constant.
1818 // For a local symbol, the local symbol index. This is GSYM_CODE
1819 // for a global symbol, or CONSTANT_CODE for a constant.
1820 unsigned int local_sym_index_;
1823 typedef std::vector<Got_entry> Got_entries;
1825 // Return the offset into the GOT of GOT entry I.
1827 got_offset(unsigned int i) const
1828 { return i * (size / 8); }
1830 // Return the offset into the GOT of the last entry added.
1832 last_got_offset() const
1833 { return this->got_offset(this->entries_.size() - 1); }
1835 // Set the size of the section.
1838 { this->set_current_data_size(this->got_offset(this->entries_.size())); }
1840 // The list of GOT entries.
1841 Got_entries entries_;
1844 // Output_data_dynamic is used to hold the data in SHT_DYNAMIC
1847 class Output_data_dynamic : public Output_section_data
1850 Output_data_dynamic(Stringpool* pool)
1851 : Output_section_data(Output_data::default_alignment()),
1852 entries_(), pool_(pool)
1855 // Add a new dynamic entry with a fixed numeric value.
1857 add_constant(elfcpp::DT tag, unsigned int val)
1858 { this->add_entry(Dynamic_entry(tag, val)); }
1860 // Add a new dynamic entry with the address of output data.
1862 add_section_address(elfcpp::DT tag, const Output_data* od)
1863 { this->add_entry(Dynamic_entry(tag, od, false)); }
1865 // Add a new dynamic entry with the address of output data
1866 // plus a constant offset.
1868 add_section_plus_offset(elfcpp::DT tag, const Output_data* od,
1869 unsigned int offset)
1870 { this->add_entry(Dynamic_entry(tag, od, offset)); }
1872 // Add a new dynamic entry with the size of output data.
1874 add_section_size(elfcpp::DT tag, const Output_data* od)
1875 { this->add_entry(Dynamic_entry(tag, od, true)); }
1877 // Add a new dynamic entry with the address of a symbol.
1879 add_symbol(elfcpp::DT tag, const Symbol* sym)
1880 { this->add_entry(Dynamic_entry(tag, sym)); }
1882 // Add a new dynamic entry with a string.
1884 add_string(elfcpp::DT tag, const char* str)
1885 { this->add_entry(Dynamic_entry(tag, this->pool_->add(str, true, NULL))); }
1888 add_string(elfcpp::DT tag, const std::string& str)
1889 { this->add_string(tag, str.c_str()); }
1892 // Adjust the output section to set the entry size.
1894 do_adjust_output_section(Output_section*);
1896 // Set the final data size.
1898 set_final_data_size();
1900 // Write out the dynamic entries.
1902 do_write(Output_file*);
1904 // Write to a map file.
1906 do_print_to_mapfile(Mapfile* mapfile) const
1907 { mapfile->print_output_data(this, _("** dynamic")); }
1910 // This POD class holds a single dynamic entry.
1914 // Create an entry with a fixed numeric value.
1915 Dynamic_entry(elfcpp::DT tag, unsigned int val)
1916 : tag_(tag), offset_(DYNAMIC_NUMBER)
1917 { this->u_.val = val; }
1919 // Create an entry with the size or address of a section.
1920 Dynamic_entry(elfcpp::DT tag, const Output_data* od, bool section_size)
1922 offset_(section_size
1923 ? DYNAMIC_SECTION_SIZE
1924 : DYNAMIC_SECTION_ADDRESS)
1925 { this->u_.od = od; }
1927 // Create an entry with the address of a section plus a constant offset.
1928 Dynamic_entry(elfcpp::DT tag, const Output_data* od, unsigned int offset)
1931 { this->u_.od = od; }
1933 // Create an entry with the address of a symbol.
1934 Dynamic_entry(elfcpp::DT tag, const Symbol* sym)
1935 : tag_(tag), offset_(DYNAMIC_SYMBOL)
1936 { this->u_.sym = sym; }
1938 // Create an entry with a string.
1939 Dynamic_entry(elfcpp::DT tag, const char* str)
1940 : tag_(tag), offset_(DYNAMIC_STRING)
1941 { this->u_.str = str; }
1943 // Return the tag of this entry.
1946 { return this->tag_; }
1948 // Write the dynamic entry to an output view.
1949 template<int size, bool big_endian>
1951 write(unsigned char* pov, const Stringpool*) const;
1954 // Classification is encoded in the OFFSET field.
1958 DYNAMIC_SECTION_ADDRESS = 0,
1960 DYNAMIC_NUMBER = -1U,
1962 DYNAMIC_SECTION_SIZE = -2U,
1964 DYNAMIC_SYMBOL = -3U,
1966 DYNAMIC_STRING = -4U
1967 // Any other value indicates a section address plus OFFSET.
1972 // For DYNAMIC_NUMBER.
1974 // For DYNAMIC_SECTION_SIZE and section address plus OFFSET.
1975 const Output_data* od;
1976 // For DYNAMIC_SYMBOL.
1978 // For DYNAMIC_STRING.
1983 // The type of entry (Classification) or offset within a section.
1984 unsigned int offset_;
1987 // Add an entry to the list.
1989 add_entry(const Dynamic_entry& entry)
1990 { this->entries_.push_back(entry); }
1992 // Sized version of write function.
1993 template<int size, bool big_endian>
1995 sized_write(Output_file* of);
1997 // The type of the list of entries.
1998 typedef std::vector<Dynamic_entry> Dynamic_entries;
2001 Dynamic_entries entries_;
2002 // The pool used for strings.
2006 // Output_symtab_xindex is used to handle SHT_SYMTAB_SHNDX sections,
2007 // which may be required if the object file has more than
2008 // SHN_LORESERVE sections.
2010 class Output_symtab_xindex : public Output_section_data
2013 Output_symtab_xindex(size_t symcount)
2014 : Output_section_data(symcount * 4, 4, true),
2018 // Add an entry: symbol number SYMNDX has section SHNDX.
2020 add(unsigned int symndx, unsigned int shndx)
2021 { this->entries_.push_back(std::make_pair(symndx, shndx)); }
2025 do_write(Output_file*);
2027 // Write to a map file.
2029 do_print_to_mapfile(Mapfile* mapfile) const
2030 { mapfile->print_output_data(this, _("** symtab xindex")); }
2033 template<bool big_endian>
2035 endian_do_write(unsigned char*);
2037 // It is likely that most symbols will not require entries. Rather
2038 // than keep a vector for all symbols, we keep pairs of symbol index
2039 // and section index.
2040 typedef std::vector<std::pair<unsigned int, unsigned int> > Xindex_entries;
2042 // The entries we need.
2043 Xindex_entries entries_;
2046 // A relaxed input section.
2047 class Output_relaxed_input_section : public Output_section_data_build
2050 // We would like to call relobj->section_addralign(shndx) to get the
2051 // alignment but we do not want the constructor to fail. So callers
2052 // are repsonsible for ensuring that.
2053 Output_relaxed_input_section(Relobj* relobj, unsigned int shndx,
2055 : Output_section_data_build(addralign), relobj_(relobj), shndx_(shndx)
2058 // Return the Relobj of this relaxed input section.
2061 { return this->relobj_; }
2063 // Return the section index of this relaxed input section.
2066 { return this->shndx_; }
2070 unsigned int shndx_;
2073 // An output section. We don't expect to have too many output
2074 // sections, so we don't bother to do a template on the size.
2076 class Output_section : public Output_data
2079 // Create an output section, giving the name, type, and flags.
2080 Output_section(const char* name, elfcpp::Elf_Word, elfcpp::Elf_Xword);
2081 virtual ~Output_section();
2083 // Add a new input section SHNDX, named NAME, with header SHDR, from
2084 // object OBJECT. RELOC_SHNDX is the index of a relocation section
2085 // which applies to this section, or 0 if none, or -1 if more than
2086 // one. HAVE_SECTIONS_SCRIPT is true if we have a SECTIONS clause
2087 // in a linker script; in that case we need to keep track of input
2088 // sections associated with an output section. Return the offset
2089 // within the output section.
2090 template<int size, bool big_endian>
2092 add_input_section(Sized_relobj<size, big_endian>* object, unsigned int shndx,
2094 const elfcpp::Shdr<size, big_endian>& shdr,
2095 unsigned int reloc_shndx, bool have_sections_script);
2097 // Add generated data POSD to this output section.
2099 add_output_section_data(Output_section_data* posd);
2101 // Add a relaxed input section PORIS to this output section.
2103 add_relaxed_input_section(Output_relaxed_input_section* poris);
2105 // Return the section name.
2108 { return this->name_; }
2110 // Return the section type.
2113 { return this->type_; }
2115 // Return the section flags.
2118 { return this->flags_; }
2120 // Update the output section flags based on input section flags.
2122 update_flags_for_input_section(elfcpp::Elf_Xword flags);
2124 // Return the entsize field.
2127 { return this->entsize_; }
2129 // Set the entsize field.
2131 set_entsize(uint64_t v);
2133 // Set the load address.
2135 set_load_address(uint64_t load_address)
2137 this->load_address_ = load_address;
2138 this->has_load_address_ = true;
2141 // Set the link field to the output section index of a section.
2143 set_link_section(const Output_data* od)
2145 gold_assert(this->link_ == 0
2146 && !this->should_link_to_symtab_
2147 && !this->should_link_to_dynsym_);
2148 this->link_section_ = od;
2151 // Set the link field to a constant.
2153 set_link(unsigned int v)
2155 gold_assert(this->link_section_ == NULL
2156 && !this->should_link_to_symtab_
2157 && !this->should_link_to_dynsym_);
2161 // Record that this section should link to the normal symbol table.
2163 set_should_link_to_symtab()
2165 gold_assert(this->link_section_ == NULL
2167 && !this->should_link_to_dynsym_);
2168 this->should_link_to_symtab_ = true;
2171 // Record that this section should link to the dynamic symbol table.
2173 set_should_link_to_dynsym()
2175 gold_assert(this->link_section_ == NULL
2177 && !this->should_link_to_symtab_);
2178 this->should_link_to_dynsym_ = true;
2181 // Return the info field.
2185 gold_assert(this->info_section_ == NULL
2186 && this->info_symndx_ == NULL);
2190 // Set the info field to the output section index of a section.
2192 set_info_section(const Output_section* os)
2194 gold_assert((this->info_section_ == NULL
2195 || (this->info_section_ == os
2196 && this->info_uses_section_index_))
2197 && this->info_symndx_ == NULL
2198 && this->info_ == 0);
2199 this->info_section_ = os;
2200 this->info_uses_section_index_= true;
2203 // Set the info field to the symbol table index of a symbol.
2205 set_info_symndx(const Symbol* sym)
2207 gold_assert(this->info_section_ == NULL
2208 && (this->info_symndx_ == NULL
2209 || this->info_symndx_ == sym)
2210 && this->info_ == 0);
2211 this->info_symndx_ = sym;
2214 // Set the info field to the symbol table index of a section symbol.
2216 set_info_section_symndx(const Output_section* os)
2218 gold_assert((this->info_section_ == NULL
2219 || (this->info_section_ == os
2220 && !this->info_uses_section_index_))
2221 && this->info_symndx_ == NULL
2222 && this->info_ == 0);
2223 this->info_section_ = os;
2224 this->info_uses_section_index_ = false;
2227 // Set the info field to a constant.
2229 set_info(unsigned int v)
2231 gold_assert(this->info_section_ == NULL
2232 && this->info_symndx_ == NULL
2233 && (this->info_ == 0
2234 || this->info_ == v));
2238 // Set the addralign field.
2240 set_addralign(uint64_t v)
2241 { this->addralign_ = v; }
2243 // Whether the output section index has been set.
2245 has_out_shndx() const
2246 { return this->out_shndx_ != -1U; }
2248 // Indicate that we need a symtab index.
2250 set_needs_symtab_index()
2251 { this->needs_symtab_index_ = true; }
2253 // Return whether we need a symtab index.
2255 needs_symtab_index() const
2256 { return this->needs_symtab_index_; }
2258 // Get the symtab index.
2260 symtab_index() const
2262 gold_assert(this->symtab_index_ != 0);
2263 return this->symtab_index_;
2266 // Set the symtab index.
2268 set_symtab_index(unsigned int index)
2270 gold_assert(index != 0);
2271 this->symtab_index_ = index;
2274 // Indicate that we need a dynsym index.
2276 set_needs_dynsym_index()
2277 { this->needs_dynsym_index_ = true; }
2279 // Return whether we need a dynsym index.
2281 needs_dynsym_index() const
2282 { return this->needs_dynsym_index_; }
2284 // Get the dynsym index.
2286 dynsym_index() const
2288 gold_assert(this->dynsym_index_ != 0);
2289 return this->dynsym_index_;
2292 // Set the dynsym index.
2294 set_dynsym_index(unsigned int index)
2296 gold_assert(index != 0);
2297 this->dynsym_index_ = index;
2300 // Return whether the input sections sections attachd to this output
2301 // section may require sorting. This is used to handle constructor
2302 // priorities compatibly with GNU ld.
2304 may_sort_attached_input_sections() const
2305 { return this->may_sort_attached_input_sections_; }
2307 // Record that the input sections attached to this output section
2308 // may require sorting.
2310 set_may_sort_attached_input_sections()
2311 { this->may_sort_attached_input_sections_ = true; }
2313 // Return whether the input sections attached to this output section
2314 // require sorting. This is used to handle constructor priorities
2315 // compatibly with GNU ld.
2317 must_sort_attached_input_sections() const
2318 { return this->must_sort_attached_input_sections_; }
2320 // Record that the input sections attached to this output section
2323 set_must_sort_attached_input_sections()
2324 { this->must_sort_attached_input_sections_ = true; }
2326 // Return whether this section holds relro data--data which has
2327 // dynamic relocations but which may be marked read-only after the
2328 // dynamic relocations have been completed.
2331 { return this->is_relro_; }
2333 // Record that this section holds relro data.
2336 { this->is_relro_ = true; }
2338 // Record that this section does not hold relro data.
2341 { this->is_relro_ = false; }
2343 // True if this section holds relro local data--relro data for which
2344 // the dynamic relocations are all RELATIVE relocations.
2346 is_relro_local() const
2347 { return this->is_relro_local_; }
2349 // Record that this section holds relro local data.
2351 set_is_relro_local()
2352 { this->is_relro_local_ = true; }
2354 // True if this is a small section: a section which holds small
2357 is_small_section() const
2358 { return this->is_small_section_; }
2360 // Record that this is a small section.
2362 set_is_small_section()
2363 { this->is_small_section_ = true; }
2365 // True if this is a large section: a section which holds large
2368 is_large_section() const
2369 { return this->is_large_section_; }
2371 // Record that this is a large section.
2373 set_is_large_section()
2374 { this->is_large_section_ = true; }
2376 // True if this is a large data (not BSS) section.
2378 is_large_data_section()
2379 { return this->is_large_section_ && this->type_ != elfcpp::SHT_NOBITS; }
2381 // Return whether this section should be written after all the input
2382 // sections are complete.
2384 after_input_sections() const
2385 { return this->after_input_sections_; }
2387 // Record that this section should be written after all the input
2388 // sections are complete.
2390 set_after_input_sections()
2391 { this->after_input_sections_ = true; }
2393 // Return whether this section requires postprocessing after all
2394 // relocations have been applied.
2396 requires_postprocessing() const
2397 { return this->requires_postprocessing_; }
2399 // If a section requires postprocessing, return the buffer to use.
2401 postprocessing_buffer() const
2403 gold_assert(this->postprocessing_buffer_ != NULL);
2404 return this->postprocessing_buffer_;
2407 // If a section requires postprocessing, create the buffer to use.
2409 create_postprocessing_buffer();
2411 // If a section requires postprocessing, this is the size of the
2412 // buffer to which relocations should be applied.
2414 postprocessing_buffer_size() const
2415 { return this->current_data_size_for_child(); }
2417 // Modify the section name. This is only permitted for an
2418 // unallocated section, and only before the size has been finalized.
2419 // Otherwise the name will not get into Layout::namepool_.
2421 set_name(const char* newname)
2423 gold_assert((this->flags_ & elfcpp::SHF_ALLOC) == 0);
2424 gold_assert(!this->is_data_size_valid());
2425 this->name_ = newname;
2428 // Return whether the offset OFFSET in the input section SHNDX in
2429 // object OBJECT is being included in the link.
2431 is_input_address_mapped(const Relobj* object, unsigned int shndx,
2432 off_t offset) const;
2434 // Return the offset within the output section of OFFSET relative to
2435 // the start of input section SHNDX in object OBJECT.
2437 output_offset(const Relobj* object, unsigned int shndx,
2438 section_offset_type offset) const;
2440 // Return the output virtual address of OFFSET relative to the start
2441 // of input section SHNDX in object OBJECT.
2443 output_address(const Relobj* object, unsigned int shndx,
2444 off_t offset) const;
2446 // Look for the merged section for input section SHNDX in object
2447 // OBJECT. If found, return true, and set *ADDR to the address of
2448 // the start of the merged section. This is not necessary the
2449 // output offset corresponding to input offset 0 in the section,
2450 // since the section may be mapped arbitrarily.
2452 find_starting_output_address(const Relobj* object, unsigned int shndx,
2453 uint64_t* addr) const;
2455 // Record that this output section was found in the SECTIONS clause
2456 // of a linker script.
2458 set_found_in_sections_clause()
2459 { this->found_in_sections_clause_ = true; }
2461 // Return whether this output section was found in the SECTIONS
2462 // clause of a linker script.
2464 found_in_sections_clause() const
2465 { return this->found_in_sections_clause_; }
2467 // Write the section header into *OPHDR.
2468 template<int size, bool big_endian>
2470 write_header(const Layout*, const Stringpool*,
2471 elfcpp::Shdr_write<size, big_endian>*) const;
2473 // The next few calls are for linker script support.
2475 // We need to export the input sections to linker scripts. Previously
2476 // we export a pair of Relobj pointer and section index. We now need to
2477 // handle relaxed input sections as well. So we use this class.
2478 class Simple_input_section
2481 static const unsigned int invalid_shndx = static_cast<unsigned int>(-1);
2484 Simple_input_section(Relobj *relobj, unsigned int shndx)
2487 gold_assert(shndx != invalid_shndx);
2488 this->u_.relobj = relobj;
2491 Simple_input_section(Output_relaxed_input_section* section)
2492 : shndx_(invalid_shndx)
2493 { this->u_.relaxed_input_section = section; }
2495 // Whether this is a relaxed section.
2497 is_relaxed_input_section() const
2498 { return this->shndx_ == invalid_shndx; }
2500 // Return object of an input section.
2504 return ((this->shndx_ != invalid_shndx)
2506 : this->u_.relaxed_input_section->relobj());
2509 // Return index of an input section.
2513 return ((this->shndx_ != invalid_shndx)
2515 : this->u_.relaxed_input_section->shndx());
2518 // Return the Output_relaxed_input_section object of a relaxed section.
2519 Output_relaxed_input_section*
2520 relaxed_input_section() const
2522 gold_assert(this->shndx_ == invalid_shndx);
2523 return this->u_.relaxed_input_section;
2527 // Pointer to either an Relobj or an Output_relaxed_input_section.
2531 Output_relaxed_input_section* relaxed_input_section;
2533 // Section index for an non-relaxed section or invalid_shndx for
2534 // a relaxed section.
2535 unsigned int shndx_;
2538 // Store the list of input sections for this Output_section into the
2539 // list passed in. This removes the input sections, leaving only
2540 // any Output_section_data elements. This returns the size of those
2541 // Output_section_data elements. ADDRESS is the address of this
2542 // output section. FILL is the fill value to use, in case there are
2543 // any spaces between the remaining Output_section_data elements.
2545 get_input_sections(uint64_t address, const std::string& fill,
2546 std::list<Simple_input_section>*);
2548 // Add an input section from a script.
2550 add_input_section_for_script(const Simple_input_section& input_section,
2551 off_t data_size, uint64_t addralign);
2553 // Set the current size of the output section.
2555 set_current_data_size(off_t size)
2556 { this->set_current_data_size_for_child(size); }
2558 // Get the current size of the output section.
2560 current_data_size() const
2561 { return this->current_data_size_for_child(); }
2563 // End of linker script support.
2565 // Save states before doing section layout.
2566 // This is used for relaxation.
2570 // Restore states prior to section layout.
2574 // Convert existing input sections to relaxed input sections.
2576 convert_input_sections_to_relaxed_sections(
2577 const std::vector<Output_relaxed_input_section*>& sections);
2579 // Find a relaxed input section to an input section in OBJECT
2580 // with index SHNDX. Return NULL if none is found.
2581 const Output_section_data*
2582 find_relaxed_input_section(const Relobj* object, unsigned int shndx) const;
2584 // Print merge statistics to stderr.
2586 print_merge_stats();
2589 // Return the output section--i.e., the object itself.
2594 // Return the section index in the output file.
2596 do_out_shndx() const
2598 gold_assert(this->out_shndx_ != -1U);
2599 return this->out_shndx_;
2602 // Set the output section index.
2604 do_set_out_shndx(unsigned int shndx)
2606 gold_assert(this->out_shndx_ == -1U || this->out_shndx_ == shndx);
2607 this->out_shndx_ = shndx;
2610 // Set the final data size of the Output_section. For a typical
2611 // Output_section, there is nothing to do, but if there are any
2612 // Output_section_data objects we need to set their final addresses
2615 set_final_data_size();
2617 // Reset the address and file offset.
2619 do_reset_address_and_file_offset();
2621 // Return true if address and file offset already have reset values. In
2622 // other words, calling reset_address_and_file_offset will not change them.
2624 do_address_and_file_offset_have_reset_values() const;
2626 // Write the data to the file. For a typical Output_section, this
2627 // does nothing: the data is written out by calling Object::Relocate
2628 // on each input object. But if there are any Output_section_data
2629 // objects we do need to write them out here.
2631 do_write(Output_file*);
2633 // Return the address alignment--function required by parent class.
2635 do_addralign() const
2636 { return this->addralign_; }
2638 // Return whether there is a load address.
2640 do_has_load_address() const
2641 { return this->has_load_address_; }
2643 // Return the load address.
2645 do_load_address() const
2647 gold_assert(this->has_load_address_);
2648 return this->load_address_;
2651 // Return whether this is an Output_section.
2653 do_is_section() const
2656 // Return whether this is a section of the specified type.
2658 do_is_section_type(elfcpp::Elf_Word type) const
2659 { return this->type_ == type; }
2661 // Return whether the specified section flag is set.
2663 do_is_section_flag_set(elfcpp::Elf_Xword flag) const
2664 { return (this->flags_ & flag) != 0; }
2666 // Set the TLS offset. Called only for SHT_TLS sections.
2668 do_set_tls_offset(uint64_t tls_base);
2670 // Return the TLS offset, relative to the base of the TLS segment.
2671 // Valid only for SHT_TLS sections.
2673 do_tls_offset() const
2674 { return this->tls_offset_; }
2676 // This may be implemented by a child class.
2678 do_finalize_name(Layout*)
2681 // Print to the map file.
2683 do_print_to_mapfile(Mapfile*) const;
2685 // Record that this section requires postprocessing after all
2686 // relocations have been applied. This is called by a child class.
2688 set_requires_postprocessing()
2690 this->requires_postprocessing_ = true;
2691 this->after_input_sections_ = true;
2694 // Write all the data of an Output_section into the postprocessing
2697 write_to_postprocessing_buffer();
2699 // In some cases we need to keep a list of the input sections
2700 // associated with this output section. We only need the list if we
2701 // might have to change the offsets of the input section within the
2702 // output section after we add the input section. The ordinary
2703 // input sections will be written out when we process the object
2704 // file, and as such we don't need to track them here. We do need
2705 // to track Output_section_data objects here. We store instances of
2706 // this structure in a std::vector, so it must be a POD. There can
2707 // be many instances of this structure, so we use a union to save
2713 : shndx_(0), p2align_(0)
2715 this->u1_.data_size = 0;
2716 this->u2_.object = NULL;
2719 // For an ordinary input section.
2720 Input_section(Relobj* object, unsigned int shndx, off_t data_size,
2723 p2align_(ffsll(static_cast<long long>(addralign)))
2725 gold_assert(shndx != OUTPUT_SECTION_CODE
2726 && shndx != MERGE_DATA_SECTION_CODE
2727 && shndx != MERGE_STRING_SECTION_CODE
2728 && shndx != RELAXED_INPUT_SECTION_CODE);
2729 this->u1_.data_size = data_size;
2730 this->u2_.object = object;
2733 // For a non-merge output section.
2734 Input_section(Output_section_data* posd)
2735 : shndx_(OUTPUT_SECTION_CODE), p2align_(0)
2737 this->u1_.data_size = 0;
2738 this->u2_.posd = posd;
2741 // For a merge section.
2742 Input_section(Output_section_data* posd, bool is_string, uint64_t entsize)
2744 ? MERGE_STRING_SECTION_CODE
2745 : MERGE_DATA_SECTION_CODE),
2748 this->u1_.entsize = entsize;
2749 this->u2_.posd = posd;
2752 // For a relaxed input section.
2753 Input_section(Output_relaxed_input_section *psection)
2754 : shndx_(RELAXED_INPUT_SECTION_CODE), p2align_(0)
2756 this->u1_.data_size = 0;
2757 this->u2_.poris = psection;
2760 // The required alignment.
2764 if (!this->is_input_section())
2765 return this->u2_.posd->addralign();
2766 return (this->p2align_ == 0
2768 : static_cast<uint64_t>(1) << (this->p2align_ - 1));
2771 // Return the required size.
2775 // Whether this is an input section.
2777 is_input_section() const
2779 return (this->shndx_ != OUTPUT_SECTION_CODE
2780 && this->shndx_ != MERGE_DATA_SECTION_CODE
2781 && this->shndx_ != MERGE_STRING_SECTION_CODE
2782 && this->shndx_ != RELAXED_INPUT_SECTION_CODE);
2785 // Return whether this is a merge section which matches the
2788 is_merge_section(bool is_string, uint64_t entsize,
2789 uint64_t addralign) const
2791 return (this->shndx_ == (is_string
2792 ? MERGE_STRING_SECTION_CODE
2793 : MERGE_DATA_SECTION_CODE)
2794 && this->u1_.entsize == entsize
2795 && this->addralign() == addralign);
2798 // Return whether this is a relaxed input section.
2800 is_relaxed_input_section() const
2801 { return this->shndx_ == RELAXED_INPUT_SECTION_CODE; }
2803 // Return whether this is a generic Output_section_data.
2805 is_output_section_data() const
2807 return this->shndx_ == OUTPUT_SECTION_CODE;
2810 // Return the object for an input section.
2814 if (this->is_input_section())
2815 return this->u2_.object;
2816 else if (this->is_relaxed_input_section())
2817 return this->u2_.poris->relobj();
2822 // Return the input section index for an input section.
2826 if (this->is_input_section())
2827 return this->shndx_;
2828 else if (this->is_relaxed_input_section())
2829 return this->u2_.poris->shndx();
2834 // For non-input-sections, return the associated Output_section_data
2836 Output_section_data*
2837 output_section_data() const
2839 gold_assert(!this->is_input_section());
2840 return this->u2_.posd;
2843 // Return the Output_relaxed_input_section object.
2844 Output_relaxed_input_section*
2845 relaxed_input_section() const
2847 gold_assert(this->is_relaxed_input_section());
2848 return this->u2_.poris;
2851 // Set the output section.
2853 set_output_section(Output_section* os)
2855 gold_assert(!this->is_input_section());
2856 Output_section_data *posd =
2857 this->is_relaxed_input_section() ? this->u2_.poris : this->u2_.posd;
2858 posd->set_output_section(os);
2861 // Set the address and file offset. This is called during
2862 // Layout::finalize. SECTION_FILE_OFFSET is the file offset of
2863 // the enclosing section.
2865 set_address_and_file_offset(uint64_t address, off_t file_offset,
2866 off_t section_file_offset);
2868 // Reset the address and file offset.
2870 reset_address_and_file_offset();
2872 // Finalize the data size.
2874 finalize_data_size();
2876 // Add an input section, for SHF_MERGE sections.
2878 add_input_section(Relobj* object, unsigned int shndx)
2880 gold_assert(this->shndx_ == MERGE_DATA_SECTION_CODE
2881 || this->shndx_ == MERGE_STRING_SECTION_CODE);
2882 return this->u2_.posd->add_input_section(object, shndx);
2885 // Given an input OBJECT, an input section index SHNDX within that
2886 // object, and an OFFSET relative to the start of that input
2887 // section, return whether or not the output offset is known. If
2888 // this function returns true, it sets *POUTPUT to the offset in
2889 // the output section, relative to the start of the input section
2890 // in the output section. *POUTPUT may be different from OFFSET
2891 // for a merged section.
2893 output_offset(const Relobj* object, unsigned int shndx,
2894 section_offset_type offset,
2895 section_offset_type *poutput) const;
2897 // Return whether this is the merge section for the input section
2900 is_merge_section_for(const Relobj* object, unsigned int shndx) const;
2902 // Write out the data. This does nothing for an input section.
2904 write(Output_file*);
2906 // Write the data to a buffer. This does nothing for an input
2909 write_to_buffer(unsigned char*);
2911 // Print to a map file.
2913 print_to_mapfile(Mapfile*) const;
2915 // Print statistics about merge sections to stderr.
2917 print_merge_stats(const char* section_name)
2919 if (this->shndx_ == MERGE_DATA_SECTION_CODE
2920 || this->shndx_ == MERGE_STRING_SECTION_CODE)
2921 this->u2_.posd->print_merge_stats(section_name);
2925 // Code values which appear in shndx_. If the value is not one of
2926 // these codes, it is the input section index in the object file.
2929 // An Output_section_data.
2930 OUTPUT_SECTION_CODE = -1U,
2931 // An Output_section_data for an SHF_MERGE section with
2932 // SHF_STRINGS not set.
2933 MERGE_DATA_SECTION_CODE = -2U,
2934 // An Output_section_data for an SHF_MERGE section with
2936 MERGE_STRING_SECTION_CODE = -3U,
2937 // An Output_section_data for a relaxed input section.
2938 RELAXED_INPUT_SECTION_CODE = -4U
2941 // For an ordinary input section, this is the section index in the
2942 // input file. For an Output_section_data, this is
2943 // OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
2944 // MERGE_STRING_SECTION_CODE.
2945 unsigned int shndx_;
2946 // The required alignment, stored as a power of 2.
2947 unsigned int p2align_;
2950 // For an ordinary input section, the section size.
2952 // For OUTPUT_SECTION_CODE or RELAXED_INPUT_SECTION_CODE, this is not
2953 // used. For MERGE_DATA_SECTION_CODE or MERGE_STRING_SECTION_CODE, the
2959 // For an ordinary input section, the object which holds the
2962 // For OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
2963 // MERGE_STRING_SECTION_CODE, the data.
2964 Output_section_data* posd;
2965 // For RELAXED_INPUT_SECTION_CODE, the data.
2966 Output_relaxed_input_section* poris;
2970 typedef std::vector<Input_section> Input_section_list;
2972 // Allow a child class to access the input sections.
2973 const Input_section_list&
2974 input_sections() const
2975 { return this->input_sections_; }
2978 // We only save enough information to undo the effects of section layout.
2979 class Checkpoint_output_section
2982 Checkpoint_output_section(uint64_t addralign, elfcpp::Elf_Xword flags,
2983 const Input_section_list& input_sections,
2984 off_t first_input_offset,
2985 bool attached_input_sections_are_sorted)
2986 : addralign_(addralign), flags_(flags),
2987 input_sections_(input_sections),
2988 input_sections_size_(input_sections_.size()),
2989 input_sections_copy_(), first_input_offset_(first_input_offset),
2990 attached_input_sections_are_sorted_(attached_input_sections_are_sorted)
2994 ~Checkpoint_output_section()
2997 // Return the address alignment.
3000 { return this->addralign_; }
3002 // Return the section flags.
3005 { return this->flags_; }
3007 // Return a reference to the input section list copy.
3010 { return &this->input_sections_copy_; }
3012 // Return the size of input_sections at the time when checkpoint is
3015 input_sections_size() const
3016 { return this->input_sections_size_; }
3018 // Whether input sections are copied.
3020 input_sections_saved() const
3021 { return this->input_sections_copy_.size() == this->input_sections_size_; }
3024 first_input_offset() const
3025 { return this->first_input_offset_; }
3028 attached_input_sections_are_sorted() const
3029 { return this->attached_input_sections_are_sorted_; }
3031 // Save input sections.
3033 save_input_sections()
3035 this->input_sections_copy_.reserve(this->input_sections_size_);
3036 this->input_sections_copy_.clear();
3037 Input_section_list::const_iterator p = this->input_sections_.begin();
3038 gold_assert(this->input_sections_size_ >= this->input_sections_.size());
3039 for(size_t i = 0; i < this->input_sections_size_ ; i++, ++p)
3040 this->input_sections_copy_.push_back(*p);
3044 // The section alignment.
3045 uint64_t addralign_;
3046 // The section flags.
3047 elfcpp::Elf_Xword flags_;
3048 // Reference to the input sections to be checkpointed.
3049 const Input_section_list& input_sections_;
3050 // Size of the checkpointed portion of input_sections_;
3051 size_t input_sections_size_;
3052 // Copy of input sections.
3053 Input_section_list input_sections_copy_;
3054 // The offset of the first entry in input_sections_.
3055 off_t first_input_offset_;
3056 // True if the input sections attached to this output section have
3057 // already been sorted.
3058 bool attached_input_sections_are_sorted_;
3061 // This class is used to sort the input sections.
3062 class Input_section_sort_entry;
3064 // This is the sort comparison function.
3065 struct Input_section_sort_compare
3068 operator()(const Input_section_sort_entry&,
3069 const Input_section_sort_entry&) const;
3072 // Fill data. This is used to fill in data between input sections.
3073 // It is also used for data statements (BYTE, WORD, etc.) in linker
3074 // scripts. When we have to keep track of the input sections, we
3075 // can use an Output_data_const, but we don't want to have to keep
3076 // track of input sections just to implement fills.
3080 Fill(off_t section_offset, off_t length)
3081 : section_offset_(section_offset),
3082 length_(convert_to_section_size_type(length))
3085 // Return section offset.
3087 section_offset() const
3088 { return this->section_offset_; }
3090 // Return fill length.
3093 { return this->length_; }
3096 // The offset within the output section.
3097 off_t section_offset_;
3098 // The length of the space to fill.
3099 section_size_type length_;
3102 typedef std::vector<Fill> Fill_list;
3104 // This class describes properties of merge data sections. It is used
3105 // as a key type for maps.
3106 class Merge_section_properties
3109 Merge_section_properties(bool is_string, uint64_t entsize,
3111 : is_string_(is_string), entsize_(entsize), addralign_(addralign)
3114 // Whether this equals to another Merge_section_properties MSP.
3116 eq(const Merge_section_properties& msp) const
3118 return ((this->is_string_ == msp.is_string_)
3119 && (this->entsize_ == msp.entsize_)
3120 && (this->addralign_ == msp.addralign_));
3123 // Compute a hash value for this using 64-bit FNV-1a hash.
3127 uint64_t h = 14695981039346656037ULL; // FNV offset basis.
3128 uint64_t prime = 1099511628211ULL;
3129 h = (h ^ static_cast<uint64_t>(this->is_string_)) * prime;
3130 h = (h ^ static_cast<uint64_t>(this->entsize_)) * prime;
3131 h = (h ^ static_cast<uint64_t>(this->addralign_)) * prime;
3135 // Functors for associative containers.
3139 operator()(const Merge_section_properties& msp1,
3140 const Merge_section_properties& msp2) const
3141 { return msp1.eq(msp2); }
3147 operator()(const Merge_section_properties& msp) const
3148 { return msp.hash_value(); }
3152 // Whether this merge data section is for strings.
3154 // Entsize of this merge data section.
3156 // Address alignment.
3157 uint64_t addralign_;
3160 // Map that link Merge_section_properties to Output_merge_base.
3161 typedef Unordered_map<Merge_section_properties, Output_merge_base*,
3162 Merge_section_properties::hash,
3163 Merge_section_properties::equal_to>
3164 Merge_section_by_properties_map;
3166 // Map that link Input_section_specifier to Output_section_data.
3167 typedef Unordered_map<Input_section_specifier, Output_section_data*,
3168 Input_section_specifier::hash,
3169 Input_section_specifier::equal_to>
3170 Output_section_data_by_input_section_map;
3172 // Map used during relaxation of existing sections. This map
3173 // an input section specifier to an input section list index.
3174 // We assume that Input_section_list is a vector.
3175 typedef Unordered_map<Input_section_specifier, size_t,
3176 Input_section_specifier::hash,
3177 Input_section_specifier::equal_to>
3180 // Add a new output section by Input_section.
3182 add_output_section_data(Input_section*);
3184 // Add an SHF_MERGE input section. Returns true if the section was
3187 add_merge_input_section(Relobj* object, unsigned int shndx, uint64_t flags,
3188 uint64_t entsize, uint64_t addralign);
3190 // Add an output SHF_MERGE section POSD to this output section.
3191 // IS_STRING indicates whether it is a SHF_STRINGS section, and
3192 // ENTSIZE is the entity size. This returns the entry added to
3195 add_output_merge_section(Output_section_data* posd, bool is_string,
3198 // Sort the attached input sections.
3200 sort_attached_input_sections();
3202 // Find the merge section into which an input section with index SHNDX in
3203 // OBJECT has been added. Return NULL if none found.
3204 Output_section_data*
3205 find_merge_section(const Relobj* object, unsigned int shndx) const;
3207 // Build a relaxation map.
3209 build_relaxation_map(
3210 const Input_section_list& input_sections,
3212 Relaxation_map* map) const;
3214 // Convert input sections in an input section list into relaxed sections.
3216 convert_input_sections_in_list_to_relaxed_sections(
3217 const std::vector<Output_relaxed_input_section*>& relaxed_sections,
3218 const Relaxation_map& map,
3219 Input_section_list* input_sections);
3221 // Most of these fields are only valid after layout.
3223 // The name of the section. This will point into a Stringpool.
3225 // The section address is in the parent class.
3226 // The section alignment.
3227 uint64_t addralign_;
3228 // The section entry size.
3230 // The load address. This is only used when using a linker script
3231 // with a SECTIONS clause. The has_load_address_ field indicates
3232 // whether this field is valid.
3233 uint64_t load_address_;
3234 // The file offset is in the parent class.
3235 // Set the section link field to the index of this section.
3236 const Output_data* link_section_;
3237 // If link_section_ is NULL, this is the link field.
3239 // Set the section info field to the index of this section.
3240 const Output_section* info_section_;
3241 // If info_section_ is NULL, set the info field to the symbol table
3242 // index of this symbol.
3243 const Symbol* info_symndx_;
3244 // If info_section_ and info_symndx_ are NULL, this is the section
3247 // The section type.
3248 const elfcpp::Elf_Word type_;
3249 // The section flags.
3250 elfcpp::Elf_Xword flags_;
3251 // The section index.
3252 unsigned int out_shndx_;
3253 // If there is a STT_SECTION for this output section in the normal
3254 // symbol table, this is the symbol index. This starts out as zero.
3255 // It is initialized in Layout::finalize() to be the index, or -1U
3256 // if there isn't one.
3257 unsigned int symtab_index_;
3258 // If there is a STT_SECTION for this output section in the dynamic
3259 // symbol table, this is the symbol index. This starts out as zero.
3260 // It is initialized in Layout::finalize() to be the index, or -1U
3261 // if there isn't one.
3262 unsigned int dynsym_index_;
3263 // The input sections. This will be empty in cases where we don't
3264 // need to keep track of them.
3265 Input_section_list input_sections_;
3266 // The offset of the first entry in input_sections_.
3267 off_t first_input_offset_;
3268 // The fill data. This is separate from input_sections_ because we
3269 // often will need fill sections without needing to keep track of
3272 // If the section requires postprocessing, this buffer holds the
3273 // section contents during relocation.
3274 unsigned char* postprocessing_buffer_;
3275 // Whether this output section needs a STT_SECTION symbol in the
3276 // normal symbol table. This will be true if there is a relocation
3278 bool needs_symtab_index_ : 1;
3279 // Whether this output section needs a STT_SECTION symbol in the
3280 // dynamic symbol table. This will be true if there is a dynamic
3281 // relocation which needs it.
3282 bool needs_dynsym_index_ : 1;
3283 // Whether the link field of this output section should point to the
3284 // normal symbol table.
3285 bool should_link_to_symtab_ : 1;
3286 // Whether the link field of this output section should point to the
3287 // dynamic symbol table.
3288 bool should_link_to_dynsym_ : 1;
3289 // Whether this section should be written after all the input
3290 // sections are complete.
3291 bool after_input_sections_ : 1;
3292 // Whether this section requires post processing after all
3293 // relocations have been applied.
3294 bool requires_postprocessing_ : 1;
3295 // Whether an input section was mapped to this output section
3296 // because of a SECTIONS clause in a linker script.
3297 bool found_in_sections_clause_ : 1;
3298 // Whether this section has an explicitly specified load address.
3299 bool has_load_address_ : 1;
3300 // True if the info_section_ field means the section index of the
3301 // section, false if it means the symbol index of the corresponding
3303 bool info_uses_section_index_ : 1;
3304 // True if the input sections attached to this output section may
3306 bool may_sort_attached_input_sections_ : 1;
3307 // True if the input sections attached to this output section must
3309 bool must_sort_attached_input_sections_ : 1;
3310 // True if the input sections attached to this output section have
3311 // already been sorted.
3312 bool attached_input_sections_are_sorted_ : 1;
3313 // True if this section holds relro data.
3315 // True if this section holds relro local data.
3316 bool is_relro_local_ : 1;
3317 // True if this is a small section.
3318 bool is_small_section_ : 1;
3319 // True if this is a large section.
3320 bool is_large_section_ : 1;
3321 // For SHT_TLS sections, the offset of this section relative to the base
3322 // of the TLS segment.
3323 uint64_t tls_offset_;
3324 // Saved checkpoint.
3325 Checkpoint_output_section* checkpoint_;
3326 // Map from input sections to merge sections.
3327 Output_section_data_by_input_section_map merge_section_map_;
3328 // Map from merge section properties to merge_sections;
3329 Merge_section_by_properties_map merge_section_by_properties_map_;
3330 // Map from input sections to relaxed input sections. This is mutable
3331 // beacause it is udpated lazily. We may need to update it in a
3332 // const qualified method.
3333 mutable Output_section_data_by_input_section_map relaxed_input_section_map_;
3334 // Whether relaxed_input_section_map_ is valid.
3335 mutable bool is_relaxed_input_section_map_valid_;
3336 // Whether code-fills are generated at write.
3337 bool generate_code_fills_at_write_;
3340 // An output segment. PT_LOAD segments are built from collections of
3341 // output sections. Other segments typically point within PT_LOAD
3342 // segments, and are built directly as needed.
3344 // NOTE: We want to use the copy constructor for this class. During
3345 // relaxation, we may try built the segments multiple times. We do
3346 // that by copying the original segment list before lay-out, doing
3347 // a trial lay-out and roll-back to the saved copied if we need to
3348 // to the lay-out again.
3350 class Output_segment
3353 // Create an output segment, specifying the type and flags.
3354 Output_segment(elfcpp::Elf_Word, elfcpp::Elf_Word);
3356 // Return the virtual address.
3359 { return this->vaddr_; }
3361 // Return the physical address.
3364 { return this->paddr_; }
3366 // Return the segment type.
3369 { return this->type_; }
3371 // Return the segment flags.
3374 { return this->flags_; }
3376 // Return the memory size.
3379 { return this->memsz_; }
3381 // Return the file size.
3384 { return this->filesz_; }
3386 // Return the file offset.
3389 { return this->offset_; }
3391 // Whether this is a segment created to hold large data sections.
3393 is_large_data_segment() const
3394 { return this->is_large_data_segment_; }
3396 // Record that this is a segment created to hold large data
3399 set_is_large_data_segment()
3400 { this->is_large_data_segment_ = true; }
3402 // Return the maximum alignment of the Output_data.
3404 maximum_alignment();
3406 // Add an Output_section to this segment.
3408 add_output_section(Output_section* os, elfcpp::Elf_Word seg_flags);
3410 // Remove an Output_section from this segment. It is an error if it
3413 remove_output_section(Output_section* os);
3415 // Add an Output_data (which is not an Output_section) to the start
3418 add_initial_output_data(Output_data*);
3420 // Return true if this segment has any sections which hold actual
3421 // data, rather than being a BSS section.
3423 has_any_data_sections() const
3424 { return !this->output_data_.empty(); }
3426 // Return the number of dynamic relocations applied to this segment.
3428 dynamic_reloc_count() const;
3430 // Return the address of the first section.
3432 first_section_load_address() const;
3434 // Return whether the addresses have been set already.
3436 are_addresses_set() const
3437 { return this->are_addresses_set_; }
3439 // Set the addresses.
3441 set_addresses(uint64_t vaddr, uint64_t paddr)
3443 this->vaddr_ = vaddr;
3444 this->paddr_ = paddr;
3445 this->are_addresses_set_ = true;
3448 // Set the segment flags. This is only used if we have a PHDRS
3449 // clause which explicitly specifies the flags.
3451 set_flags(elfcpp::Elf_Word flags)
3452 { this->flags_ = flags; }
3454 // Set the address of the segment to ADDR and the offset to *POFF
3455 // and set the addresses and offsets of all contained output
3456 // sections accordingly. Set the section indexes of all contained
3457 // output sections starting with *PSHNDX. If RESET is true, first
3458 // reset the addresses of the contained sections. Return the
3459 // address of the immediately following segment. Update *POFF and
3460 // *PSHNDX. This should only be called for a PT_LOAD segment.
3462 set_section_addresses(const Layout*, bool reset, uint64_t addr, off_t* poff,
3463 unsigned int* pshndx);
3465 // Set the minimum alignment of this segment. This may be adjusted
3466 // upward based on the section alignments.
3468 set_minimum_p_align(uint64_t align)
3469 { this->min_p_align_ = align; }
3471 // Set the offset of this segment based on the section. This should
3472 // only be called for a non-PT_LOAD segment.
3476 // Set the TLS offsets of the sections contained in the PT_TLS segment.
3480 // Return the number of output sections.
3482 output_section_count() const;
3484 // Return the section attached to the list segment with the lowest
3485 // load address. This is used when handling a PHDRS clause in a
3488 section_with_lowest_load_address() const;
3490 // Write the segment header into *OPHDR.
3491 template<int size, bool big_endian>
3493 write_header(elfcpp::Phdr_write<size, big_endian>*);
3495 // Write the section headers of associated sections into V.
3496 template<int size, bool big_endian>
3498 write_section_headers(const Layout*, const Stringpool*, unsigned char* v,
3499 unsigned int* pshndx) const;
3501 // Print the output sections in the map file.
3503 print_sections_to_mapfile(Mapfile*) const;
3506 typedef std::list<Output_data*> Output_data_list;
3508 // Find the maximum alignment in an Output_data_list.
3510 maximum_alignment_list(const Output_data_list*);
3512 // Return whether the first data section is a relro section.
3514 is_first_section_relro() const;
3516 // Set the section addresses in an Output_data_list.
3518 set_section_list_addresses(const Layout*, bool reset, Output_data_list*,
3519 uint64_t addr, off_t* poff, unsigned int* pshndx,
3520 bool* in_tls, bool* in_relro);
3522 // Return the number of Output_sections in an Output_data_list.
3524 output_section_count_list(const Output_data_list*) const;
3526 // Return the number of dynamic relocs in an Output_data_list.
3528 dynamic_reloc_count_list(const Output_data_list*) const;
3530 // Find the section with the lowest load address in an
3531 // Output_data_list.
3533 lowest_load_address_in_list(const Output_data_list* pdl,
3534 Output_section** found,
3535 uint64_t* found_lma) const;
3537 // Write the section headers in the list into V.
3538 template<int size, bool big_endian>
3540 write_section_headers_list(const Layout*, const Stringpool*,
3541 const Output_data_list*, unsigned char* v,
3542 unsigned int* pshdx) const;
3544 // Print a section list to the mapfile.
3546 print_section_list_to_mapfile(Mapfile*, const Output_data_list*) const;
3548 // NOTE: We want to use the copy constructor. Currently, shallow copy
3549 // works for us so we do not need to write our own copy constructor.
3551 // The list of output data with contents attached to this segment.
3552 Output_data_list output_data_;
3553 // The list of output data without contents attached to this segment.
3554 Output_data_list output_bss_;
3555 // The segment virtual address.
3557 // The segment physical address.
3559 // The size of the segment in memory.
3561 // The maximum section alignment. The is_max_align_known_ field
3562 // indicates whether this has been finalized.
3563 uint64_t max_align_;
3564 // The required minimum value for the p_align field. This is used
3565 // for PT_LOAD segments. Note that this does not mean that
3566 // addresses should be aligned to this value; it means the p_paddr
3567 // and p_vaddr fields must be congruent modulo this value. For
3568 // non-PT_LOAD segments, the dynamic linker works more efficiently
3569 // if the p_align field has the more conventional value, although it
3570 // can align as needed.
3571 uint64_t min_p_align_;
3572 // The offset of the segment data within the file.
3574 // The size of the segment data in the file.
3576 // The segment type;
3577 elfcpp::Elf_Word type_;
3578 // The segment flags.
3579 elfcpp::Elf_Word flags_;
3580 // Whether we have finalized max_align_.
3581 bool is_max_align_known_ : 1;
3582 // Whether vaddr and paddr were set by a linker script.
3583 bool are_addresses_set_ : 1;
3584 // Whether this segment holds large data sections.
3585 bool is_large_data_segment_ : 1;
3588 // This class represents the output file.
3593 Output_file(const char* name);
3595 // Indicate that this is a temporary file which should not be
3599 { this->is_temporary_ = true; }
3601 // Try to open an existing file. Returns false if the file doesn't
3602 // exist, has a size of 0 or can't be mmaped. This method is
3605 open_for_modification();
3607 // Open the output file. FILE_SIZE is the final size of the file.
3608 // If the file already exists, it is deleted/truncated. This method
3609 // is thread-unsafe.
3611 open(off_t file_size);
3613 // Resize the output file. This method is thread-unsafe.
3615 resize(off_t file_size);
3617 // Close the output file (flushing all buffered data) and make sure
3618 // there are no errors. This method is thread-unsafe.
3622 // Return the size of this file.
3625 { return this->file_size_; }
3627 // We currently always use mmap which makes the view handling quite
3628 // simple. In the future we may support other approaches.
3630 // Write data to the output file.
3632 write(off_t offset, const void* data, size_t len)
3633 { memcpy(this->base_ + offset, data, len); }
3635 // Get a buffer to use to write to the file, given the offset into
3636 // the file and the size.
3638 get_output_view(off_t start, size_t size)
3640 gold_assert(start >= 0
3641 && start + static_cast<off_t>(size) <= this->file_size_);
3642 return this->base_ + start;
3645 // VIEW must have been returned by get_output_view. Write the
3646 // buffer to the file, passing in the offset and the size.
3648 write_output_view(off_t, size_t, unsigned char*)
3651 // Get a read/write buffer. This is used when we want to write part
3652 // of the file, read it in, and write it again.
3654 get_input_output_view(off_t start, size_t size)
3655 { return this->get_output_view(start, size); }
3657 // Write a read/write buffer back to the file.
3659 write_input_output_view(off_t, size_t, unsigned char*)
3662 // Get a read buffer. This is used when we just want to read part
3663 // of the file back it in.
3664 const unsigned char*
3665 get_input_view(off_t start, size_t size)
3666 { return this->get_output_view(start, size); }
3668 // Release a read bfufer.
3670 free_input_view(off_t, size_t, const unsigned char*)
3674 // Map the file into memory or, if that fails, allocate anonymous
3679 // Allocate anonymous memory for the file.
3683 // Map the file into memory.
3687 // Unmap the file from memory (and flush to disk buffers).
3697 // Base of file mapped into memory.
3698 unsigned char* base_;
3699 // True iff base_ points to a memory buffer rather than an output file.
3700 bool map_is_anonymous_;
3701 // True if this is a temporary file which should not be output.
3705 } // End namespace gold.
3707 #endif // !defined(GOLD_OUTPUT_H)