1 // output.h -- manage the output file for gold -*- C++ -*-
3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011 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 // An abtract class for data which has to go into the output file.
55 explicit Output_data()
56 : address_(0), data_size_(0), offset_(-1),
57 is_address_valid_(false), is_data_size_valid_(false),
58 is_offset_valid_(false), is_data_size_fixed_(false),
59 has_dynamic_reloc_(false)
65 // Return the address. For allocated sections, this is only valid
66 // after Layout::finalize is finished.
70 gold_assert(this->is_address_valid_
);
71 return this->address_
;
74 // Return the size of the data. For allocated sections, this must
75 // be valid after Layout::finalize calls set_address, but need not
76 // be valid before then.
80 gold_assert(this->is_data_size_valid_
);
81 return this->data_size_
;
84 // Get the current data size.
86 current_data_size() const
87 { return this->current_data_size_for_child(); }
89 // Return true if data size is fixed.
91 is_data_size_fixed() const
92 { return this->is_data_size_fixed_
; }
94 // Return the file offset. This is only valid after
95 // Layout::finalize is finished. For some non-allocated sections,
96 // it may not be valid until near the end of the link.
100 gold_assert(this->is_offset_valid_
);
101 return this->offset_
;
104 // Reset the address and file offset. This essentially disables the
105 // sanity testing about duplicate and unknown settings.
107 reset_address_and_file_offset()
109 this->is_address_valid_
= false;
110 this->is_offset_valid_
= false;
111 if (!this->is_data_size_fixed_
)
112 this->is_data_size_valid_
= false;
113 this->do_reset_address_and_file_offset();
116 // Return true if address and file offset already have reset values. In
117 // other words, calling reset_address_and_file_offset will not change them.
119 address_and_file_offset_have_reset_values() const
120 { return this->do_address_and_file_offset_have_reset_values(); }
122 // Return the required alignment.
125 { return this->do_addralign(); }
127 // Return whether this has a load address.
129 has_load_address() const
130 { return this->do_has_load_address(); }
132 // Return the load address.
135 { return this->do_load_address(); }
137 // Return whether this is an Output_section.
140 { return this->do_is_section(); }
142 // Return whether this is an Output_section of the specified type.
144 is_section_type(elfcpp::Elf_Word stt
) const
145 { return this->do_is_section_type(stt
); }
147 // Return whether this is an Output_section with the specified flag
150 is_section_flag_set(elfcpp::Elf_Xword shf
) const
151 { return this->do_is_section_flag_set(shf
); }
153 // Return the output section that this goes in, if there is one.
156 { return this->do_output_section(); }
158 const Output_section
*
159 output_section() const
160 { return this->do_output_section(); }
162 // Return the output section index, if there is an output section.
165 { return this->do_out_shndx(); }
167 // Set the output section index, if this is an output section.
169 set_out_shndx(unsigned int shndx
)
170 { this->do_set_out_shndx(shndx
); }
172 // Set the address and file offset of this data, and finalize the
173 // size of the data. This is called during Layout::finalize for
174 // allocated sections.
176 set_address_and_file_offset(uint64_t addr
, off_t off
)
178 this->set_address(addr
);
179 this->set_file_offset(off
);
180 this->finalize_data_size();
185 set_address(uint64_t addr
)
187 gold_assert(!this->is_address_valid_
);
188 this->address_
= addr
;
189 this->is_address_valid_
= true;
192 // Set the file offset.
194 set_file_offset(off_t off
)
196 gold_assert(!this->is_offset_valid_
);
198 this->is_offset_valid_
= true;
201 // Update the data size without finalizing it.
203 pre_finalize_data_size()
205 if (!this->is_data_size_valid_
)
207 // Tell the child class to update the data size.
208 this->update_data_size();
212 // Finalize the data size.
216 if (!this->is_data_size_valid_
)
218 // Tell the child class to set the data size.
219 this->set_final_data_size();
220 gold_assert(this->is_data_size_valid_
);
224 // Set the TLS offset. Called only for SHT_TLS sections.
226 set_tls_offset(uint64_t tls_base
)
227 { this->do_set_tls_offset(tls_base
); }
229 // Return the TLS offset, relative to the base of the TLS segment.
230 // Valid only for SHT_TLS sections.
233 { return this->do_tls_offset(); }
235 // Write the data to the output file. This is called after
236 // Layout::finalize is complete.
238 write(Output_file
* file
)
239 { this->do_write(file
); }
241 // This is called by Layout::finalize to note that the sizes of
242 // allocated sections must now be fixed.
245 { Output_data::allocated_sizes_are_fixed
= true; }
247 // Used to check that layout has been done.
250 { return Output_data::allocated_sizes_are_fixed
; }
252 // Note that a dynamic reloc has been applied to this data.
255 { this->has_dynamic_reloc_
= true; }
257 // Return whether a dynamic reloc has been applied.
259 has_dynamic_reloc() const
260 { return this->has_dynamic_reloc_
; }
262 // Whether the address is valid.
264 is_address_valid() const
265 { return this->is_address_valid_
; }
267 // Whether the file offset is valid.
269 is_offset_valid() const
270 { return this->is_offset_valid_
; }
272 // Whether the data size is valid.
274 is_data_size_valid() const
275 { return this->is_data_size_valid_
; }
277 // Print information to the map file.
279 print_to_mapfile(Mapfile
* mapfile
) const
280 { return this->do_print_to_mapfile(mapfile
); }
283 // Functions that child classes may or in some cases must implement.
285 // Write the data to the output file.
287 do_write(Output_file
*) = 0;
289 // Return the required alignment.
291 do_addralign() const = 0;
293 // Return whether this has a load address.
295 do_has_load_address() const
298 // Return the load address.
300 do_load_address() const
301 { gold_unreachable(); }
303 // Return whether this is an Output_section.
305 do_is_section() const
308 // Return whether this is an Output_section of the specified type.
309 // This only needs to be implement by Output_section.
311 do_is_section_type(elfcpp::Elf_Word
) const
314 // Return whether this is an Output_section with the specific flag
315 // set. This only needs to be implemented by Output_section.
317 do_is_section_flag_set(elfcpp::Elf_Xword
) const
320 // Return the output section, if there is one.
321 virtual Output_section
*
325 virtual const Output_section
*
326 do_output_section() const
329 // Return the output section index, if there is an output section.
332 { gold_unreachable(); }
334 // Set the output section index, if this is an output section.
336 do_set_out_shndx(unsigned int)
337 { gold_unreachable(); }
339 // This is a hook for derived classes to set the preliminary data size.
340 // This is called by pre_finalize_data_size, normally called during
341 // Layout::finalize, before the section address is set, and is used
342 // during an incremental update, when we need to know the size of a
343 // section before allocating space in the output file. For classes
344 // where the current data size is up to date, this default version of
345 // the method can be inherited.
350 // This is a hook for derived classes to set the data size. This is
351 // called by finalize_data_size, normally called during
352 // Layout::finalize, when the section address is set.
354 set_final_data_size()
355 { gold_unreachable(); }
357 // A hook for resetting the address and file offset.
359 do_reset_address_and_file_offset()
362 // Return true if address and file offset already have reset values. In
363 // other words, calling reset_address_and_file_offset will not change them.
364 // A child class overriding do_reset_address_and_file_offset may need to
365 // also override this.
367 do_address_and_file_offset_have_reset_values() const
368 { return !this->is_address_valid_
&& !this->is_offset_valid_
; }
370 // Set the TLS offset. Called only for SHT_TLS sections.
372 do_set_tls_offset(uint64_t)
373 { gold_unreachable(); }
375 // Return the TLS offset, relative to the base of the TLS segment.
376 // Valid only for SHT_TLS sections.
378 do_tls_offset() const
379 { gold_unreachable(); }
381 // Print to the map file. This only needs to be implemented by
382 // classes which may appear in a PT_LOAD segment.
384 do_print_to_mapfile(Mapfile
*) const
385 { gold_unreachable(); }
387 // Functions that child classes may call.
389 // Reset the address. The Output_section class needs this when an
390 // SHF_ALLOC input section is added to an output section which was
391 // formerly not SHF_ALLOC.
393 mark_address_invalid()
394 { this->is_address_valid_
= false; }
396 // Set the size of the data.
398 set_data_size(off_t data_size
)
400 gold_assert(!this->is_data_size_valid_
401 && !this->is_data_size_fixed_
);
402 this->data_size_
= data_size
;
403 this->is_data_size_valid_
= true;
406 // Fix the data size. Once it is fixed, it cannot be changed
407 // and the data size remains always valid.
411 gold_assert(this->is_data_size_valid_
);
412 this->is_data_size_fixed_
= true;
415 // Get the current data size--this is for the convenience of
416 // sections which build up their size over time.
418 current_data_size_for_child() const
419 { return this->data_size_
; }
421 // Set the current data size--this is for the convenience of
422 // sections which build up their size over time.
424 set_current_data_size_for_child(off_t data_size
)
426 gold_assert(!this->is_data_size_valid_
);
427 this->data_size_
= data_size
;
430 // Return default alignment for the target size.
434 // Return default alignment for a specified size--32 or 64.
436 default_alignment_for_size(int size
);
439 Output_data(const Output_data
&);
440 Output_data
& operator=(const Output_data
&);
442 // This is used for verification, to make sure that we don't try to
443 // change any sizes of allocated sections after we set the section
445 static bool allocated_sizes_are_fixed
;
447 // Memory address in output file.
449 // Size of data in output file.
451 // File offset of contents in output file.
453 // Whether address_ is valid.
454 bool is_address_valid_
: 1;
455 // Whether data_size_ is valid.
456 bool is_data_size_valid_
: 1;
457 // Whether offset_ is valid.
458 bool is_offset_valid_
: 1;
459 // Whether data size is fixed.
460 bool is_data_size_fixed_
: 1;
461 // Whether any dynamic relocs have been applied to this section.
462 bool has_dynamic_reloc_
: 1;
465 // Output the section headers.
467 class Output_section_headers
: public Output_data
470 Output_section_headers(const Layout
*,
471 const Layout::Segment_list
*,
472 const Layout::Section_list
*,
473 const Layout::Section_list
*,
475 const Output_section
*);
478 // Write the data to the file.
480 do_write(Output_file
*);
482 // Return the required alignment.
485 { return Output_data::default_alignment(); }
487 // Write to a map file.
489 do_print_to_mapfile(Mapfile
* mapfile
) const
490 { mapfile
->print_output_data(this, _("** section headers")); }
492 // Update the data size.
495 { this->set_data_size(this->do_size()); }
497 // Set final data size.
499 set_final_data_size()
500 { this->set_data_size(this->do_size()); }
503 // Write the data to the file with the right size and endianness.
504 template<int size
, bool big_endian
>
506 do_sized_write(Output_file
*);
508 // Compute data size.
512 const Layout
* layout_
;
513 const Layout::Segment_list
* segment_list_
;
514 const Layout::Section_list
* section_list_
;
515 const Layout::Section_list
* unattached_section_list_
;
516 const Stringpool
* secnamepool_
;
517 const Output_section
* shstrtab_section_
;
520 // Output the segment headers.
522 class Output_segment_headers
: public Output_data
525 Output_segment_headers(const Layout::Segment_list
& segment_list
);
528 // Write the data to the file.
530 do_write(Output_file
*);
532 // Return the required alignment.
535 { return Output_data::default_alignment(); }
537 // Write to a map file.
539 do_print_to_mapfile(Mapfile
* mapfile
) const
540 { mapfile
->print_output_data(this, _("** segment headers")); }
542 // Set final data size.
544 set_final_data_size()
545 { this->set_data_size(this->do_size()); }
548 // Write the data to the file with the right size and endianness.
549 template<int size
, bool big_endian
>
551 do_sized_write(Output_file
*);
553 // Compute the current size.
557 const Layout::Segment_list
& segment_list_
;
560 // Output the ELF file header.
562 class Output_file_header
: public Output_data
565 Output_file_header(const Target
*,
567 const Output_segment_headers
*,
570 // Add information about the section headers. We lay out the ELF
571 // file header before we create the section headers.
572 void set_section_info(const Output_section_headers
*,
573 const Output_section
* shstrtab
);
576 // Write the data to the file.
578 do_write(Output_file
*);
580 // Return the required alignment.
583 { return Output_data::default_alignment(); }
585 // Write to a map file.
587 do_print_to_mapfile(Mapfile
* mapfile
) const
588 { mapfile
->print_output_data(this, _("** file header")); }
590 // Set final data size.
592 set_final_data_size(void)
593 { this->set_data_size(this->do_size()); }
596 // Write the data to the file with the right size and endianness.
597 template<int size
, bool big_endian
>
599 do_sized_write(Output_file
*);
601 // Return the value to use for the entry address.
603 typename
elfcpp::Elf_types
<size
>::Elf_Addr
606 // Compute the current data size.
610 const Target
* target_
;
611 const Symbol_table
* symtab_
;
612 const Output_segment_headers
* segment_header_
;
613 const Output_section_headers
* section_header_
;
614 const Output_section
* shstrtab_
;
618 // Output sections are mainly comprised of input sections. However,
619 // there are cases where we have data to write out which is not in an
620 // input section. Output_section_data is used in such cases. This is
621 // an abstract base class.
623 class Output_section_data
: public Output_data
626 Output_section_data(off_t data_size
, uint64_t addralign
,
627 bool is_data_size_fixed
)
628 : Output_data(), output_section_(NULL
), addralign_(addralign
)
630 this->set_data_size(data_size
);
631 if (is_data_size_fixed
)
632 this->fix_data_size();
635 Output_section_data(uint64_t addralign
)
636 : Output_data(), output_section_(NULL
), addralign_(addralign
)
639 // Return the output section.
642 { return this->output_section_
; }
644 const Output_section
*
645 output_section() const
646 { return this->output_section_
; }
648 // Record the output section.
650 set_output_section(Output_section
* os
);
652 // Add an input section, for SHF_MERGE sections. This returns true
653 // if the section was handled.
655 add_input_section(Relobj
* object
, unsigned int shndx
)
656 { return this->do_add_input_section(object
, shndx
); }
658 // Given an input OBJECT, an input section index SHNDX within that
659 // object, and an OFFSET relative to the start of that input
660 // section, return whether or not the corresponding offset within
661 // the output section is known. If this function returns true, it
662 // sets *POUTPUT to the output offset. The value -1 indicates that
663 // this input offset is being discarded.
665 output_offset(const Relobj
* object
, unsigned int shndx
,
666 section_offset_type offset
,
667 section_offset_type
* poutput
) const
668 { return this->do_output_offset(object
, shndx
, offset
, poutput
); }
670 // Return whether this is the merge section for the input section
671 // SHNDX in OBJECT. This should return true when output_offset
672 // would return true for some values of OFFSET.
674 is_merge_section_for(const Relobj
* object
, unsigned int shndx
) const
675 { return this->do_is_merge_section_for(object
, shndx
); }
677 // Write the contents to a buffer. This is used for sections which
678 // require postprocessing, such as compression.
680 write_to_buffer(unsigned char* buffer
)
681 { this->do_write_to_buffer(buffer
); }
683 // Print merge stats to stderr. This should only be called for
684 // SHF_MERGE sections.
686 print_merge_stats(const char* section_name
)
687 { this->do_print_merge_stats(section_name
); }
690 // The child class must implement do_write.
692 // The child class may implement specific adjustments to the output
695 do_adjust_output_section(Output_section
*)
698 // May be implemented by child class. Return true if the section
701 do_add_input_section(Relobj
*, unsigned int)
702 { gold_unreachable(); }
704 // The child class may implement output_offset.
706 do_output_offset(const Relobj
*, unsigned int, section_offset_type
,
707 section_offset_type
*) const
710 // The child class may implement is_merge_section_for.
712 do_is_merge_section_for(const Relobj
*, unsigned int) const
715 // The child class may implement write_to_buffer. Most child
716 // classes can not appear in a compressed section, and they do not
719 do_write_to_buffer(unsigned char*)
720 { gold_unreachable(); }
722 // Print merge statistics.
724 do_print_merge_stats(const char*)
725 { gold_unreachable(); }
727 // Return the required alignment.
730 { return this->addralign_
; }
732 // Return the output section.
735 { return this->output_section_
; }
737 const Output_section
*
738 do_output_section() const
739 { return this->output_section_
; }
741 // Return the section index of the output section.
743 do_out_shndx() const;
745 // Set the alignment.
747 set_addralign(uint64_t addralign
);
750 // The output section for this section.
751 Output_section
* output_section_
;
752 // The required alignment.
756 // Some Output_section_data classes build up their data step by step,
757 // rather than all at once. This class provides an interface for
760 class Output_section_data_build
: public Output_section_data
763 Output_section_data_build(uint64_t addralign
)
764 : Output_section_data(addralign
)
767 Output_section_data_build(off_t data_size
, uint64_t addralign
)
768 : Output_section_data(data_size
, addralign
, false)
771 // Set the current data size.
773 set_current_data_size(off_t data_size
)
774 { this->set_current_data_size_for_child(data_size
); }
777 // Set the final data size.
779 set_final_data_size()
780 { this->set_data_size(this->current_data_size_for_child()); }
783 // A simple case of Output_data in which we have constant data to
786 class Output_data_const
: public Output_section_data
789 Output_data_const(const std::string
& data
, uint64_t addralign
)
790 : Output_section_data(data
.size(), addralign
, true), data_(data
)
793 Output_data_const(const char* p
, off_t len
, uint64_t addralign
)
794 : Output_section_data(len
, addralign
, true), data_(p
, len
)
797 Output_data_const(const unsigned char* p
, off_t len
, uint64_t addralign
)
798 : Output_section_data(len
, addralign
, true),
799 data_(reinterpret_cast<const char*>(p
), len
)
803 // Write the data to the output file.
805 do_write(Output_file
*);
807 // Write the data to a buffer.
809 do_write_to_buffer(unsigned char* buffer
)
810 { memcpy(buffer
, this->data_
.data(), this->data_
.size()); }
812 // Write to a map file.
814 do_print_to_mapfile(Mapfile
* mapfile
) const
815 { mapfile
->print_output_data(this, _("** fill")); }
821 // Another version of Output_data with constant data, in which the
822 // buffer is allocated by the caller.
824 class Output_data_const_buffer
: public Output_section_data
827 Output_data_const_buffer(const unsigned char* p
, off_t len
,
828 uint64_t addralign
, const char* map_name
)
829 : Output_section_data(len
, addralign
, true),
830 p_(p
), map_name_(map_name
)
834 // Write the data the output file.
836 do_write(Output_file
*);
838 // Write the data to a buffer.
840 do_write_to_buffer(unsigned char* buffer
)
841 { memcpy(buffer
, this->p_
, this->data_size()); }
843 // Write to a map file.
845 do_print_to_mapfile(Mapfile
* mapfile
) const
846 { mapfile
->print_output_data(this, _(this->map_name_
)); }
849 // The data to output.
850 const unsigned char* p_
;
851 // Name to use in a map file. Maps are a rarely used feature, but
852 // the space usage is minor as aren't very many of these objects.
853 const char* map_name_
;
856 // A place holder for a fixed amount of data written out via some
859 class Output_data_fixed_space
: public Output_section_data
862 Output_data_fixed_space(off_t data_size
, uint64_t addralign
,
863 const char* map_name
)
864 : Output_section_data(data_size
, addralign
, true),
869 // Write out the data--the actual data must be written out
872 do_write(Output_file
*)
875 // Write to a map file.
877 do_print_to_mapfile(Mapfile
* mapfile
) const
878 { mapfile
->print_output_data(this, _(this->map_name_
)); }
881 // Name to use in a map file. Maps are a rarely used feature, but
882 // the space usage is minor as aren't very many of these objects.
883 const char* map_name_
;
886 // A place holder for variable sized data written out via some other
889 class Output_data_space
: public Output_section_data_build
892 explicit Output_data_space(uint64_t addralign
, const char* map_name
)
893 : Output_section_data_build(addralign
),
897 explicit Output_data_space(off_t data_size
, uint64_t addralign
,
898 const char* map_name
)
899 : Output_section_data_build(data_size
, addralign
),
903 // Set the alignment.
905 set_space_alignment(uint64_t align
)
906 { this->set_addralign(align
); }
909 // Write out the data--the actual data must be written out
912 do_write(Output_file
*)
915 // Write to a map file.
917 do_print_to_mapfile(Mapfile
* mapfile
) const
918 { mapfile
->print_output_data(this, _(this->map_name_
)); }
921 // Name to use in a map file. Maps are a rarely used feature, but
922 // the space usage is minor as aren't very many of these objects.
923 const char* map_name_
;
926 // Fill fixed space with zeroes. This is just like
927 // Output_data_fixed_space, except that the map name is known.
929 class Output_data_zero_fill
: public Output_section_data
932 Output_data_zero_fill(off_t data_size
, uint64_t addralign
)
933 : Output_section_data(data_size
, addralign
, true)
937 // There is no data to write out.
939 do_write(Output_file
*)
942 // Write to a map file.
944 do_print_to_mapfile(Mapfile
* mapfile
) const
945 { mapfile
->print_output_data(this, "** zero fill"); }
948 // A string table which goes into an output section.
950 class Output_data_strtab
: public Output_section_data
953 Output_data_strtab(Stringpool
* strtab
)
954 : Output_section_data(1), strtab_(strtab
)
958 // This is called to update the section size prior to assigning
959 // the address and file offset.
962 { this->set_final_data_size(); }
964 // This is called to set the address and file offset. Here we make
965 // sure that the Stringpool is finalized.
967 set_final_data_size();
969 // Write out the data.
971 do_write(Output_file
*);
973 // Write the data to a buffer.
975 do_write_to_buffer(unsigned char* buffer
)
976 { this->strtab_
->write_to_buffer(buffer
, this->data_size()); }
978 // Write to a map file.
980 do_print_to_mapfile(Mapfile
* mapfile
) const
981 { mapfile
->print_output_data(this, _("** string table")); }
987 // This POD class is used to represent a single reloc in the output
988 // file. This could be a private class within Output_data_reloc, but
989 // the templatization is complex enough that I broke it out into a
990 // separate class. The class is templatized on either elfcpp::SHT_REL
991 // or elfcpp::SHT_RELA, and also on whether this is a dynamic
992 // relocation or an ordinary relocation.
994 // A relocation can be against a global symbol, a local symbol, a
995 // local section symbol, an output section, or the undefined symbol at
996 // index 0. We represent the latter by using a NULL global symbol.
998 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
1001 template<bool dynamic
, int size
, bool big_endian
>
1002 class Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>
1005 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
1006 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Addend
;
1008 static const Address invalid_address
= static_cast<Address
>(0) - 1;
1010 // An uninitialized entry. We need this because we want to put
1011 // instances of this class into an STL container.
1013 : local_sym_index_(INVALID_CODE
)
1016 // We have a bunch of different constructors. They come in pairs
1017 // depending on how the address of the relocation is specified. It
1018 // can either be an offset in an Output_data or an offset in an
1021 // A reloc against a global symbol.
1023 Output_reloc(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1024 Address address
, bool is_relative
, bool is_symbolless
);
1026 Output_reloc(Symbol
* gsym
, unsigned int type
,
1027 Sized_relobj
<size
, big_endian
>* relobj
,
1028 unsigned int shndx
, Address address
, bool is_relative
,
1029 bool is_symbolless
);
1031 // A reloc against a local symbol or local section symbol.
1033 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
1034 unsigned int local_sym_index
, unsigned int type
,
1035 Output_data
* od
, Address address
, bool is_relative
,
1036 bool is_symbolless
, bool is_section_symbol
);
1038 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
1039 unsigned int local_sym_index
, unsigned int type
,
1040 unsigned int shndx
, Address address
, bool is_relative
,
1041 bool is_symbolless
, bool is_section_symbol
);
1043 // A reloc against the STT_SECTION symbol of an output section.
1045 Output_reloc(Output_section
* os
, unsigned int type
, Output_data
* od
,
1048 Output_reloc(Output_section
* os
, unsigned int type
,
1049 Sized_relobj
<size
, big_endian
>* relobj
,
1050 unsigned int shndx
, Address address
);
1052 // An absolute relocation with no symbol.
1054 Output_reloc(unsigned int type
, Output_data
* od
, Address address
);
1056 Output_reloc(unsigned int type
, Sized_relobj
<size
, big_endian
>* relobj
,
1057 unsigned int shndx
, Address address
);
1059 // A target specific relocation. The target will be called to get
1060 // the symbol index, passing ARG. The type and offset will be set
1061 // as for other relocation types.
1063 Output_reloc(unsigned int type
, void* arg
, Output_data
* od
,
1066 Output_reloc(unsigned int type
, void* arg
,
1067 Sized_relobj
<size
, big_endian
>* relobj
,
1068 unsigned int shndx
, Address address
);
1070 // Return the reloc type.
1073 { return this->type_
; }
1075 // Return whether this is a RELATIVE relocation.
1078 { return this->is_relative_
; }
1080 // Return whether this is a relocation which should not use
1081 // a symbol, but which obtains its addend from a symbol.
1083 is_symbolless() const
1084 { return this->is_symbolless_
; }
1086 // Return whether this is against a local section symbol.
1088 is_local_section_symbol() const
1090 return (this->local_sym_index_
!= GSYM_CODE
1091 && this->local_sym_index_
!= SECTION_CODE
1092 && this->local_sym_index_
!= INVALID_CODE
1093 && this->local_sym_index_
!= TARGET_CODE
1094 && this->is_section_symbol_
);
1097 // Return whether this is a target specific relocation.
1099 is_target_specific() const
1100 { return this->local_sym_index_
== TARGET_CODE
; }
1102 // Return the argument to pass to the target for a target specific
1107 gold_assert(this->local_sym_index_
== TARGET_CODE
);
1108 return this->u1_
.arg
;
1111 // For a local section symbol, return the offset of the input
1112 // section within the output section. ADDEND is the addend being
1113 // applied to the input section.
1115 local_section_offset(Addend addend
) const;
1117 // Get the value of the symbol referred to by a Rel relocation when
1118 // we are adding the given ADDEND.
1120 symbol_value(Addend addend
) const;
1122 // Write the reloc entry to an output view.
1124 write(unsigned char* pov
) const;
1126 // Write the offset and info fields to Write_rel.
1127 template<typename Write_rel
>
1128 void write_rel(Write_rel
*) const;
1130 // This is used when sorting dynamic relocs. Return -1 to sort this
1131 // reloc before R2, 0 to sort the same as R2, 1 to sort after R2.
1133 compare(const Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>& r2
)
1136 // Return whether this reloc should be sorted before the argument
1137 // when sorting dynamic relocs.
1139 sort_before(const Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>&
1141 { return this->compare(r2
) < 0; }
1144 // Record that we need a dynamic symbol index.
1146 set_needs_dynsym_index();
1148 // Return the symbol index.
1150 get_symbol_index() const;
1152 // Return the output address.
1154 get_address() const;
1156 // Codes for local_sym_index_.
1165 // Invalid uninitialized entry.
1171 // For a local symbol or local section symbol
1172 // (this->local_sym_index_ >= 0), the object. We will never
1173 // generate a relocation against a local symbol in a dynamic
1174 // object; that doesn't make sense. And our callers will always
1175 // be templatized, so we use Sized_relobj here.
1176 Sized_relobj
<size
, big_endian
>* relobj
;
1177 // For a global symbol (this->local_sym_index_ == GSYM_CODE, the
1178 // symbol. If this is NULL, it indicates a relocation against the
1179 // undefined 0 symbol.
1181 // For a relocation against an output section
1182 // (this->local_sym_index_ == SECTION_CODE), the output section.
1184 // For a target specific relocation, an argument to pass to the
1190 // If this->shndx_ is not INVALID CODE, the object which holds the
1191 // input section being used to specify the reloc address.
1192 Sized_relobj
<size
, big_endian
>* relobj
;
1193 // If this->shndx_ is INVALID_CODE, the output data being used to
1194 // specify the reloc address. This may be NULL if the reloc
1195 // address is absolute.
1198 // The address offset within the input section or the Output_data.
1200 // This is GSYM_CODE for a global symbol, or SECTION_CODE for a
1201 // relocation against an output section, or TARGET_CODE for a target
1202 // specific relocation, or INVALID_CODE for an uninitialized value.
1203 // Otherwise, for a local symbol (this->is_section_symbol_ is
1204 // false), the local symbol index. For a local section symbol
1205 // (this->is_section_symbol_ is true), the section index in the
1207 unsigned int local_sym_index_
;
1208 // The reloc type--a processor specific code.
1209 unsigned int type_
: 29;
1210 // True if the relocation is a RELATIVE relocation.
1211 bool is_relative_
: 1;
1212 // True if the relocation is one which should not use
1213 // a symbol, but which obtains its addend from a symbol.
1214 bool is_symbolless_
: 1;
1215 // True if the relocation is against a section symbol.
1216 bool is_section_symbol_
: 1;
1217 // If the reloc address is an input section in an object, the
1218 // section index. This is INVALID_CODE if the reloc address is
1219 // specified in some other way.
1220 unsigned int shndx_
;
1223 // The SHT_RELA version of Output_reloc<>. This is just derived from
1224 // the SHT_REL version of Output_reloc, but it adds an addend.
1226 template<bool dynamic
, int size
, bool big_endian
>
1227 class Output_reloc
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>
1230 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
1231 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Addend
;
1233 // An uninitialized entry.
1238 // A reloc against a global symbol.
1240 Output_reloc(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1241 Address address
, Addend addend
, bool is_relative
,
1243 : rel_(gsym
, type
, od
, address
, is_relative
, is_symbolless
),
1247 Output_reloc(Symbol
* gsym
, unsigned int type
,
1248 Sized_relobj
<size
, big_endian
>* relobj
,
1249 unsigned int shndx
, Address address
, Addend addend
,
1250 bool is_relative
, bool is_symbolless
)
1251 : rel_(gsym
, type
, relobj
, shndx
, address
, is_relative
,
1252 is_symbolless
), addend_(addend
)
1255 // A reloc against a local symbol.
1257 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
1258 unsigned int local_sym_index
, unsigned int type
,
1259 Output_data
* od
, Address address
,
1260 Addend addend
, bool is_relative
,
1261 bool is_symbolless
, bool is_section_symbol
)
1262 : rel_(relobj
, local_sym_index
, type
, od
, address
, is_relative
,
1263 is_symbolless
, is_section_symbol
),
1267 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
1268 unsigned int local_sym_index
, unsigned int type
,
1269 unsigned int shndx
, Address address
,
1270 Addend addend
, bool is_relative
,
1271 bool is_symbolless
, bool is_section_symbol
)
1272 : rel_(relobj
, local_sym_index
, type
, shndx
, address
, is_relative
,
1273 is_symbolless
, is_section_symbol
),
1277 // A reloc against the STT_SECTION symbol of an output section.
1279 Output_reloc(Output_section
* os
, unsigned int type
, Output_data
* od
,
1280 Address address
, Addend addend
)
1281 : rel_(os
, type
, od
, address
), addend_(addend
)
1284 Output_reloc(Output_section
* os
, unsigned int type
,
1285 Sized_relobj
<size
, big_endian
>* relobj
,
1286 unsigned int shndx
, Address address
, Addend addend
)
1287 : rel_(os
, type
, relobj
, shndx
, address
), addend_(addend
)
1290 // An absolute relocation with no symbol.
1292 Output_reloc(unsigned int type
, Output_data
* od
, Address address
,
1294 : rel_(type
, od
, address
), addend_(addend
)
1297 Output_reloc(unsigned int type
, Sized_relobj
<size
, big_endian
>* relobj
,
1298 unsigned int shndx
, Address address
, Addend addend
)
1299 : rel_(type
, relobj
, shndx
, address
), addend_(addend
)
1302 // A target specific relocation. The target will be called to get
1303 // the symbol index and the addend, passing ARG. The type and
1304 // offset will be set as for other relocation types.
1306 Output_reloc(unsigned int type
, void* arg
, Output_data
* od
,
1307 Address address
, Addend addend
)
1308 : rel_(type
, arg
, od
, address
), addend_(addend
)
1311 Output_reloc(unsigned int type
, void* arg
,
1312 Sized_relobj
<size
, big_endian
>* relobj
,
1313 unsigned int shndx
, Address address
, Addend addend
)
1314 : rel_(type
, arg
, relobj
, shndx
, address
), addend_(addend
)
1317 // Return whether this is a RELATIVE relocation.
1320 { return this->rel_
.is_relative(); }
1322 // Return whether this is a relocation which should not use
1323 // a symbol, but which obtains its addend from a symbol.
1325 is_symbolless() const
1326 { return this->rel_
.is_symbolless(); }
1328 // Write the reloc entry to an output view.
1330 write(unsigned char* pov
) const;
1332 // Return whether this reloc should be sorted before the argument
1333 // when sorting dynamic relocs.
1335 sort_before(const Output_reloc
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>&
1338 int i
= this->rel_
.compare(r2
.rel_
);
1344 return this->addend_
< r2
.addend_
;
1349 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
> rel_
;
1354 // Output_data_reloc_generic is a non-template base class for
1355 // Output_data_reloc_base. This gives the generic code a way to hold
1356 // a pointer to a reloc section.
1358 class Output_data_reloc_generic
: public Output_section_data_build
1361 Output_data_reloc_generic(int size
, bool sort_relocs
)
1362 : Output_section_data_build(Output_data::default_alignment_for_size(size
)),
1363 relative_reloc_count_(0), sort_relocs_(sort_relocs
)
1366 // Return the number of relative relocs in this section.
1368 relative_reloc_count() const
1369 { return this->relative_reloc_count_
; }
1371 // Whether we should sort the relocs.
1374 { return this->sort_relocs_
; }
1377 // Note that we've added another relative reloc.
1379 bump_relative_reloc_count()
1380 { ++this->relative_reloc_count_
; }
1383 // The number of relative relocs added to this section. This is to
1384 // support DT_RELCOUNT.
1385 size_t relative_reloc_count_
;
1386 // Whether to sort the relocations when writing them out, to make
1387 // the dynamic linker more efficient.
1391 // Output_data_reloc is used to manage a section containing relocs.
1392 // SH_TYPE is either elfcpp::SHT_REL or elfcpp::SHT_RELA. DYNAMIC
1393 // indicates whether this is a dynamic relocation or a normal
1394 // relocation. Output_data_reloc_base is a base class.
1395 // Output_data_reloc is the real class, which we specialize based on
1398 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
1399 class Output_data_reloc_base
: public Output_data_reloc_generic
1402 typedef Output_reloc
<sh_type
, dynamic
, size
, big_endian
> Output_reloc_type
;
1403 typedef typename
Output_reloc_type::Address Address
;
1404 static const int reloc_size
=
1405 Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
;
1407 // Construct the section.
1408 Output_data_reloc_base(bool sort_relocs
)
1409 : Output_data_reloc_generic(size
, sort_relocs
)
1413 // Write out the data.
1415 do_write(Output_file
*);
1417 // Set the entry size and the link.
1419 do_adjust_output_section(Output_section
* os
);
1421 // Write to a map file.
1423 do_print_to_mapfile(Mapfile
* mapfile
) const
1425 mapfile
->print_output_data(this,
1427 ? _("** dynamic relocs")
1431 // Add a relocation entry.
1433 add(Output_data
* od
, const Output_reloc_type
& reloc
)
1435 this->relocs_
.push_back(reloc
);
1436 this->set_current_data_size(this->relocs_
.size() * reloc_size
);
1437 od
->add_dynamic_reloc();
1438 if (reloc
.is_relative())
1439 this->bump_relative_reloc_count();
1443 typedef std::vector
<Output_reloc_type
> Relocs
;
1445 // The class used to sort the relocations.
1446 struct Sort_relocs_comparison
1449 operator()(const Output_reloc_type
& r1
, const Output_reloc_type
& r2
) const
1450 { return r1
.sort_before(r2
); }
1453 // The relocations in this section.
1457 // The class which callers actually create.
1459 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
1460 class Output_data_reloc
;
1462 // The SHT_REL version of Output_data_reloc.
1464 template<bool dynamic
, int size
, bool big_endian
>
1465 class Output_data_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>
1466 : public Output_data_reloc_base
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>
1469 typedef Output_data_reloc_base
<elfcpp::SHT_REL
, dynamic
, size
,
1473 typedef typename
Base::Output_reloc_type Output_reloc_type
;
1474 typedef typename
Output_reloc_type::Address Address
;
1476 Output_data_reloc(bool sr
)
1477 : Output_data_reloc_base
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>(sr
)
1480 // Add a reloc against a global symbol.
1483 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
, Address address
)
1484 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, false, false)); }
1487 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1488 Sized_relobj
<size
, big_endian
>* relobj
,
1489 unsigned int shndx
, Address address
)
1490 { this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1493 // These are to simplify the Copy_relocs class.
1496 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
, Address address
,
1499 gold_assert(addend
== 0);
1500 this->add_global(gsym
, type
, od
, address
);
1504 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1505 Sized_relobj
<size
, big_endian
>* relobj
,
1506 unsigned int shndx
, Address address
, Address addend
)
1508 gold_assert(addend
== 0);
1509 this->add_global(gsym
, type
, od
, relobj
, shndx
, address
);
1512 // Add a RELATIVE reloc against a global symbol. The final relocation
1513 // will not reference the symbol.
1516 add_global_relative(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1518 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, true, true)); }
1521 add_global_relative(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1522 Sized_relobj
<size
, big_endian
>* relobj
,
1523 unsigned int shndx
, Address address
)
1525 this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1529 // Add a global relocation which does not use a symbol for the relocation,
1530 // but which gets its addend from a symbol.
1533 add_symbolless_global_addend(Symbol
* gsym
, unsigned int type
,
1534 Output_data
* od
, Address address
)
1535 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, false, true)); }
1538 add_symbolless_global_addend(Symbol
* gsym
, unsigned int type
,
1540 Sized_relobj
<size
, big_endian
>* relobj
,
1541 unsigned int shndx
, Address address
)
1543 this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1547 // Add a reloc against a local symbol.
1550 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
1551 unsigned int local_sym_index
, unsigned int type
,
1552 Output_data
* od
, Address address
)
1554 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
,
1555 address
, false, false, false));
1559 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
1560 unsigned int local_sym_index
, unsigned int type
,
1561 Output_data
* od
, unsigned int shndx
, Address address
)
1563 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1564 address
, false, false, false));
1567 // Add a RELATIVE reloc against a local symbol.
1570 add_local_relative(Sized_relobj
<size
, big_endian
>* relobj
,
1571 unsigned int local_sym_index
, unsigned int type
,
1572 Output_data
* od
, Address address
)
1574 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
,
1575 address
, true, true, false));
1579 add_local_relative(Sized_relobj
<size
, big_endian
>* relobj
,
1580 unsigned int local_sym_index
, unsigned int type
,
1581 Output_data
* od
, unsigned int shndx
, Address address
)
1583 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1584 address
, true, true, false));
1587 // Add a local relocation which does not use a symbol for the relocation,
1588 // but which gets its addend from a symbol.
1591 add_symbolless_local_addend(Sized_relobj
<size
, big_endian
>* relobj
,
1592 unsigned int local_sym_index
, unsigned int type
,
1593 Output_data
* od
, Address address
)
1595 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
,
1596 address
, false, true, false));
1600 add_symbolless_local_addend(Sized_relobj
<size
, big_endian
>* relobj
,
1601 unsigned int local_sym_index
, unsigned int type
,
1602 Output_data
* od
, unsigned int shndx
,
1605 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1606 address
, false, true, false));
1609 // Add a reloc against a local section symbol. This will be
1610 // converted into a reloc against the STT_SECTION symbol of the
1614 add_local_section(Sized_relobj
<size
, big_endian
>* relobj
,
1615 unsigned int input_shndx
, unsigned int type
,
1616 Output_data
* od
, Address address
)
1618 this->add(od
, Output_reloc_type(relobj
, input_shndx
, type
, od
,
1619 address
, false, false, true));
1623 add_local_section(Sized_relobj
<size
, big_endian
>* relobj
,
1624 unsigned int input_shndx
, unsigned int type
,
1625 Output_data
* od
, unsigned int shndx
, Address address
)
1627 this->add(od
, Output_reloc_type(relobj
, input_shndx
, type
, shndx
,
1628 address
, false, false, true));
1631 // A reloc against the STT_SECTION symbol of an output section.
1632 // OS is the Output_section that the relocation refers to; OD is
1633 // the Output_data object being relocated.
1636 add_output_section(Output_section
* os
, unsigned int type
,
1637 Output_data
* od
, Address address
)
1638 { this->add(od
, Output_reloc_type(os
, type
, od
, address
)); }
1641 add_output_section(Output_section
* os
, unsigned int type
, Output_data
* od
,
1642 Sized_relobj
<size
, big_endian
>* relobj
,
1643 unsigned int shndx
, Address address
)
1644 { this->add(od
, Output_reloc_type(os
, type
, relobj
, shndx
, address
)); }
1646 // Add an absolute relocation.
1649 add_absolute(unsigned int type
, Output_data
* od
, Address address
)
1650 { this->add(od
, Output_reloc_type(type
, od
, address
)); }
1653 add_absolute(unsigned int type
, Output_data
* od
,
1654 Sized_relobj
<size
, big_endian
>* relobj
,
1655 unsigned int shndx
, Address address
)
1656 { this->add(od
, Output_reloc_type(type
, relobj
, shndx
, address
)); }
1658 // Add a target specific relocation. A target which calls this must
1659 // define the reloc_symbol_index and reloc_addend virtual functions.
1662 add_target_specific(unsigned int type
, void* arg
, Output_data
* od
,
1664 { this->add(od
, Output_reloc_type(type
, arg
, od
, address
)); }
1667 add_target_specific(unsigned int type
, void* arg
, Output_data
* od
,
1668 Sized_relobj
<size
, big_endian
>* relobj
,
1669 unsigned int shndx
, Address address
)
1670 { this->add(od
, Output_reloc_type(type
, arg
, relobj
, shndx
, address
)); }
1673 // The SHT_RELA version of Output_data_reloc.
1675 template<bool dynamic
, int size
, bool big_endian
>
1676 class Output_data_reloc
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>
1677 : public Output_data_reloc_base
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>
1680 typedef Output_data_reloc_base
<elfcpp::SHT_RELA
, dynamic
, size
,
1684 typedef typename
Base::Output_reloc_type Output_reloc_type
;
1685 typedef typename
Output_reloc_type::Address Address
;
1686 typedef typename
Output_reloc_type::Addend Addend
;
1688 Output_data_reloc(bool sr
)
1689 : Output_data_reloc_base
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>(sr
)
1692 // Add a reloc against a global symbol.
1695 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1696 Address address
, Addend addend
)
1697 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, addend
,
1701 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1702 Sized_relobj
<size
, big_endian
>* relobj
,
1703 unsigned int shndx
, Address address
,
1705 { this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1706 addend
, false, false)); }
1708 // Add a RELATIVE reloc against a global symbol. The final output
1709 // relocation will not reference the symbol, but we must keep the symbol
1710 // information long enough to set the addend of the relocation correctly
1711 // when it is written.
1714 add_global_relative(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1715 Address address
, Addend addend
)
1716 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, addend
, true,
1720 add_global_relative(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1721 Sized_relobj
<size
, big_endian
>* relobj
,
1722 unsigned int shndx
, Address address
, Addend addend
)
1723 { this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1724 addend
, true, true)); }
1726 // Add a global relocation which does not use a symbol for the relocation,
1727 // but which gets its addend from a symbol.
1730 add_symbolless_global_addend(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1731 Address address
, Addend addend
)
1732 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, addend
,
1736 add_symbolless_global_addend(Symbol
* gsym
, unsigned int type
,
1738 Sized_relobj
<size
, big_endian
>* relobj
,
1739 unsigned int shndx
, Address address
, Addend addend
)
1740 { this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1741 addend
, false, true)); }
1743 // Add a reloc against a local symbol.
1746 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
1747 unsigned int local_sym_index
, unsigned int type
,
1748 Output_data
* od
, Address address
, Addend addend
)
1750 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
, address
,
1751 addend
, false, false, false));
1755 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
1756 unsigned int local_sym_index
, unsigned int type
,
1757 Output_data
* od
, unsigned int shndx
, Address address
,
1760 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1761 address
, addend
, false, false, false));
1764 // Add a RELATIVE reloc against a local symbol.
1767 add_local_relative(Sized_relobj
<size
, big_endian
>* relobj
,
1768 unsigned int local_sym_index
, unsigned int type
,
1769 Output_data
* od
, Address address
, Addend addend
)
1771 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
, address
,
1772 addend
, true, true, false));
1776 add_local_relative(Sized_relobj
<size
, big_endian
>* relobj
,
1777 unsigned int local_sym_index
, unsigned int type
,
1778 Output_data
* od
, unsigned int shndx
, Address address
,
1781 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1782 address
, addend
, true, true, false));
1785 // Add a local relocation which does not use a symbol for the relocation,
1786 // but which gets it's addend from a symbol.
1789 add_symbolless_local_addend(Sized_relobj
<size
, big_endian
>* relobj
,
1790 unsigned int local_sym_index
, unsigned int type
,
1791 Output_data
* od
, Address address
, Addend addend
)
1793 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
, address
,
1794 addend
, false, true, false));
1798 add_symbolless_local_addend(Sized_relobj
<size
, big_endian
>* relobj
,
1799 unsigned int local_sym_index
, unsigned int type
,
1800 Output_data
* od
, unsigned int shndx
,
1801 Address address
, Addend addend
)
1803 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1804 address
, addend
, false, true, false));
1807 // Add a reloc against a local section symbol. This will be
1808 // converted into a reloc against the STT_SECTION symbol of the
1812 add_local_section(Sized_relobj
<size
, big_endian
>* relobj
,
1813 unsigned int input_shndx
, unsigned int type
,
1814 Output_data
* od
, Address address
, Addend addend
)
1816 this->add(od
, Output_reloc_type(relobj
, input_shndx
, type
, od
, address
,
1817 addend
, false, false, true));
1821 add_local_section(Sized_relobj
<size
, big_endian
>* relobj
,
1822 unsigned int input_shndx
, unsigned int type
,
1823 Output_data
* od
, unsigned int shndx
, Address address
,
1826 this->add(od
, Output_reloc_type(relobj
, input_shndx
, type
, shndx
,
1827 address
, addend
, false, false, true));
1830 // A reloc against the STT_SECTION symbol of an output section.
1833 add_output_section(Output_section
* os
, unsigned int type
, Output_data
* od
,
1834 Address address
, Addend addend
)
1835 { this->add(od
, Output_reloc_type(os
, type
, od
, address
, addend
)); }
1838 add_output_section(Output_section
* os
, unsigned int type
, Output_data
* od
,
1839 Sized_relobj
<size
, big_endian
>* relobj
,
1840 unsigned int shndx
, Address address
, Addend addend
)
1841 { this->add(od
, Output_reloc_type(os
, type
, relobj
, shndx
, address
,
1844 // Add an absolute relocation.
1847 add_absolute(unsigned int type
, Output_data
* od
, Address address
,
1849 { this->add(od
, Output_reloc_type(type
, od
, address
, addend
)); }
1852 add_absolute(unsigned int type
, Output_data
* od
,
1853 Sized_relobj
<size
, big_endian
>* relobj
,
1854 unsigned int shndx
, Address address
, Addend addend
)
1855 { this->add(od
, Output_reloc_type(type
, relobj
, shndx
, address
, addend
)); }
1857 // Add a target specific relocation. A target which calls this must
1858 // define the reloc_symbol_index and reloc_addend virtual functions.
1861 add_target_specific(unsigned int type
, void* arg
, Output_data
* od
,
1862 Address address
, Addend addend
)
1863 { this->add(od
, Output_reloc_type(type
, arg
, od
, address
, addend
)); }
1866 add_target_specific(unsigned int type
, void* arg
, Output_data
* od
,
1867 Sized_relobj
<size
, big_endian
>* relobj
,
1868 unsigned int shndx
, Address address
, Addend addend
)
1870 this->add(od
, Output_reloc_type(type
, arg
, relobj
, shndx
, address
,
1875 // Output_relocatable_relocs represents a relocation section in a
1876 // relocatable link. The actual data is written out in the target
1877 // hook relocate_for_relocatable. This just saves space for it.
1879 template<int sh_type
, int size
, bool big_endian
>
1880 class Output_relocatable_relocs
: public Output_section_data
1883 Output_relocatable_relocs(Relocatable_relocs
* rr
)
1884 : Output_section_data(Output_data::default_alignment_for_size(size
)),
1889 set_final_data_size();
1891 // Write out the data. There is nothing to do here.
1893 do_write(Output_file
*)
1896 // Write to a map file.
1898 do_print_to_mapfile(Mapfile
* mapfile
) const
1899 { mapfile
->print_output_data(this, _("** relocs")); }
1902 // The relocs associated with this input section.
1903 Relocatable_relocs
* rr_
;
1906 // Handle a GROUP section.
1908 template<int size
, bool big_endian
>
1909 class Output_data_group
: public Output_section_data
1912 // The constructor clears *INPUT_SHNDXES.
1913 Output_data_group(Sized_relobj
<size
, big_endian
>* relobj
,
1914 section_size_type entry_count
,
1915 elfcpp::Elf_Word flags
,
1916 std::vector
<unsigned int>* input_shndxes
);
1919 do_write(Output_file
*);
1921 // Write to a map file.
1923 do_print_to_mapfile(Mapfile
* mapfile
) const
1924 { mapfile
->print_output_data(this, _("** group")); }
1926 // Set final data size.
1928 set_final_data_size()
1929 { this->set_data_size((this->input_shndxes_
.size() + 1) * 4); }
1932 // The input object.
1933 Sized_relobj
<size
, big_endian
>* relobj_
;
1934 // The group flag word.
1935 elfcpp::Elf_Word flags_
;
1936 // The section indexes of the input sections in this group.
1937 std::vector
<unsigned int> input_shndxes_
;
1940 // Output_data_got is used to manage a GOT. Each entry in the GOT is
1941 // for one symbol--either a global symbol or a local symbol in an
1942 // object. The target specific code adds entries to the GOT as
1945 template<int size
, bool big_endian
>
1946 class Output_data_got
: public Output_section_data_build
1949 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Valtype
;
1950 typedef Output_data_reloc
<elfcpp::SHT_REL
, true, size
, big_endian
> Rel_dyn
;
1951 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
> Rela_dyn
;
1954 : Output_section_data_build(Output_data::default_alignment_for_size(size
)),
1955 entries_(), free_list_()
1958 Output_data_got(off_t data_size
)
1959 : Output_section_data_build(data_size
,
1960 Output_data::default_alignment_for_size(size
)),
1961 entries_(), free_list_()
1963 // For an incremental update, we have an existing GOT section.
1964 // Initialize the list of entries and the free list.
1965 this->entries_
.resize(data_size
/ (size
/ 8));
1966 this->free_list_
.init(data_size
, false);
1969 // Add an entry for a global symbol to the GOT. Return true if this
1970 // is a new GOT entry, false if the symbol was already in the GOT.
1972 add_global(Symbol
* gsym
, unsigned int got_type
);
1974 // Like add_global, but use the PLT offset of the global symbol if
1977 add_global_plt(Symbol
* gsym
, unsigned int got_type
);
1979 // Add an entry for a global symbol to the GOT, and add a dynamic
1980 // relocation of type R_TYPE for the GOT entry.
1982 add_global_with_rel(Symbol
* gsym
, unsigned int got_type
,
1983 Rel_dyn
* rel_dyn
, unsigned int r_type
);
1986 add_global_with_rela(Symbol
* gsym
, unsigned int got_type
,
1987 Rela_dyn
* rela_dyn
, unsigned int r_type
);
1989 // Add a pair of entries for a global symbol to the GOT, and add
1990 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
1992 add_global_pair_with_rel(Symbol
* gsym
, unsigned int got_type
,
1993 Rel_dyn
* rel_dyn
, unsigned int r_type_1
,
1994 unsigned int r_type_2
);
1997 add_global_pair_with_rela(Symbol
* gsym
, unsigned int got_type
,
1998 Rela_dyn
* rela_dyn
, unsigned int r_type_1
,
1999 unsigned int r_type_2
);
2001 // Add an entry for a local symbol to the GOT. This returns true if
2002 // this is a new GOT entry, false if the symbol already has a GOT
2005 add_local(Sized_relobj
<size
, big_endian
>* object
, unsigned int sym_index
,
2006 unsigned int got_type
);
2008 // Like add_local, but use the PLT offset of the local symbol if it
2011 add_local_plt(Sized_relobj
<size
, big_endian
>* object
, unsigned int sym_index
,
2012 unsigned int got_type
);
2014 // Add an entry for a local symbol to the GOT, and add a dynamic
2015 // relocation of type R_TYPE for the GOT entry.
2017 add_local_with_rel(Sized_relobj
<size
, big_endian
>* object
,
2018 unsigned int sym_index
, unsigned int got_type
,
2019 Rel_dyn
* rel_dyn
, unsigned int r_type
);
2022 add_local_with_rela(Sized_relobj
<size
, big_endian
>* object
,
2023 unsigned int sym_index
, unsigned int got_type
,
2024 Rela_dyn
* rela_dyn
, unsigned int r_type
);
2026 // Add a pair of entries for a local symbol to the GOT, and add
2027 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
2029 add_local_pair_with_rel(Sized_relobj
<size
, big_endian
>* object
,
2030 unsigned int sym_index
, unsigned int shndx
,
2031 unsigned int got_type
, Rel_dyn
* rel_dyn
,
2032 unsigned int r_type_1
, unsigned int r_type_2
);
2035 add_local_pair_with_rela(Sized_relobj
<size
, big_endian
>* object
,
2036 unsigned int sym_index
, unsigned int shndx
,
2037 unsigned int got_type
, Rela_dyn
* rela_dyn
,
2038 unsigned int r_type_1
, unsigned int r_type_2
);
2040 // Add a constant to the GOT. This returns the offset of the new
2041 // entry from the start of the GOT.
2043 add_constant(Valtype constant
)
2045 unsigned int got_offset
= this->add_got_entry(Got_entry(constant
));
2049 // Reserve a slot in the GOT for a local symbol or the second slot of a pair.
2051 reserve_slot(unsigned int i
);
2053 // Reserve a slot in the GOT for a global symbol.
2055 reserve_slot_for_global(unsigned int i
, Symbol
* gsym
, unsigned int got_type
);
2058 // Write out the GOT table.
2060 do_write(Output_file
*);
2062 // Write to a map file.
2064 do_print_to_mapfile(Mapfile
* mapfile
) const
2065 { mapfile
->print_output_data(this, _("** GOT")); }
2068 // This POD class holds a single GOT entry.
2072 // Create a zero entry.
2074 : local_sym_index_(RESERVED_CODE
), use_plt_offset_(false)
2075 { this->u_
.constant
= 0; }
2077 // Create a global symbol entry.
2078 Got_entry(Symbol
* gsym
, bool use_plt_offset
)
2079 : local_sym_index_(GSYM_CODE
), use_plt_offset_(use_plt_offset
)
2080 { this->u_
.gsym
= gsym
; }
2082 // Create a local symbol entry.
2083 Got_entry(Sized_relobj
<size
, big_endian
>* object
,
2084 unsigned int local_sym_index
, bool use_plt_offset
)
2085 : local_sym_index_(local_sym_index
), use_plt_offset_(use_plt_offset
)
2087 gold_assert(local_sym_index
!= GSYM_CODE
2088 && local_sym_index
!= CONSTANT_CODE
2089 && local_sym_index
!= RESERVED_CODE
2090 && local_sym_index
== this->local_sym_index_
);
2091 this->u_
.object
= object
;
2094 // Create a constant entry. The constant is a host value--it will
2095 // be swapped, if necessary, when it is written out.
2096 explicit Got_entry(Valtype constant
)
2097 : local_sym_index_(CONSTANT_CODE
), use_plt_offset_(false)
2098 { this->u_
.constant
= constant
; }
2100 // Write the GOT entry to an output view.
2102 write(unsigned char* pov
) const;
2107 GSYM_CODE
= 0x7fffffff,
2108 CONSTANT_CODE
= 0x7ffffffe,
2109 RESERVED_CODE
= 0x7ffffffd
2114 // For a local symbol, the object.
2115 Sized_relobj
<size
, big_endian
>* object
;
2116 // For a global symbol, the symbol.
2118 // For a constant, the constant.
2121 // For a local symbol, the local symbol index. This is GSYM_CODE
2122 // for a global symbol, or CONSTANT_CODE for a constant.
2123 unsigned int local_sym_index_
: 31;
2124 // Whether to use the PLT offset of the symbol if it has one.
2125 bool use_plt_offset_
: 1;
2128 typedef std::vector
<Got_entry
> Got_entries
;
2130 // Create a new GOT entry and return its offset.
2132 add_got_entry(Got_entry got_entry
);
2134 // Create a pair of new GOT entries and return the offset of the first.
2136 add_got_entry_pair(Got_entry got_entry_1
, Got_entry got_entry_2
);
2138 // Return the offset into the GOT of GOT entry I.
2140 got_offset(unsigned int i
) const
2141 { return i
* (size
/ 8); }
2143 // Return the offset into the GOT of the last entry added.
2145 last_got_offset() const
2146 { return this->got_offset(this->entries_
.size() - 1); }
2148 // Set the size of the section.
2151 { this->set_current_data_size(this->got_offset(this->entries_
.size())); }
2153 // The list of GOT entries.
2154 Got_entries entries_
;
2156 // List of available regions within the section, for incremental
2158 Free_list free_list_
;
2161 // Output_data_dynamic is used to hold the data in SHT_DYNAMIC
2164 class Output_data_dynamic
: public Output_section_data
2167 Output_data_dynamic(Stringpool
* pool
)
2168 : Output_section_data(Output_data::default_alignment()),
2169 entries_(), pool_(pool
)
2172 // Add a new dynamic entry with a fixed numeric value.
2174 add_constant(elfcpp::DT tag
, unsigned int val
)
2175 { this->add_entry(Dynamic_entry(tag
, val
)); }
2177 // Add a new dynamic entry with the address of output data.
2179 add_section_address(elfcpp::DT tag
, const Output_data
* od
)
2180 { this->add_entry(Dynamic_entry(tag
, od
, false)); }
2182 // Add a new dynamic entry with the address of output data
2183 // plus a constant offset.
2185 add_section_plus_offset(elfcpp::DT tag
, const Output_data
* od
,
2186 unsigned int offset
)
2187 { this->add_entry(Dynamic_entry(tag
, od
, offset
)); }
2189 // Add a new dynamic entry with the size of output data.
2191 add_section_size(elfcpp::DT tag
, const Output_data
* od
)
2192 { this->add_entry(Dynamic_entry(tag
, od
, true)); }
2194 // Add a new dynamic entry with the total size of two output datas.
2196 add_section_size(elfcpp::DT tag
, const Output_data
* od
,
2197 const Output_data
* od2
)
2198 { this->add_entry(Dynamic_entry(tag
, od
, od2
)); }
2200 // Add a new dynamic entry with the address of a symbol.
2202 add_symbol(elfcpp::DT tag
, const Symbol
* sym
)
2203 { this->add_entry(Dynamic_entry(tag
, sym
)); }
2205 // Add a new dynamic entry with a string.
2207 add_string(elfcpp::DT tag
, const char* str
)
2208 { this->add_entry(Dynamic_entry(tag
, this->pool_
->add(str
, true, NULL
))); }
2211 add_string(elfcpp::DT tag
, const std::string
& str
)
2212 { this->add_string(tag
, str
.c_str()); }
2215 // Adjust the output section to set the entry size.
2217 do_adjust_output_section(Output_section
*);
2219 // Set the final data size.
2221 set_final_data_size();
2223 // Write out the dynamic entries.
2225 do_write(Output_file
*);
2227 // Write to a map file.
2229 do_print_to_mapfile(Mapfile
* mapfile
) const
2230 { mapfile
->print_output_data(this, _("** dynamic")); }
2233 // This POD class holds a single dynamic entry.
2237 // Create an entry with a fixed numeric value.
2238 Dynamic_entry(elfcpp::DT tag
, unsigned int val
)
2239 : tag_(tag
), offset_(DYNAMIC_NUMBER
)
2240 { this->u_
.val
= val
; }
2242 // Create an entry with the size or address of a section.
2243 Dynamic_entry(elfcpp::DT tag
, const Output_data
* od
, bool section_size
)
2245 offset_(section_size
2246 ? DYNAMIC_SECTION_SIZE
2247 : DYNAMIC_SECTION_ADDRESS
)
2253 // Create an entry with the size of two sections.
2254 Dynamic_entry(elfcpp::DT tag
, const Output_data
* od
, const Output_data
* od2
)
2256 offset_(DYNAMIC_SECTION_SIZE
)
2262 // Create an entry with the address of a section plus a constant offset.
2263 Dynamic_entry(elfcpp::DT tag
, const Output_data
* od
, unsigned int offset
)
2266 { this->u_
.od
= od
; }
2268 // Create an entry with the address of a symbol.
2269 Dynamic_entry(elfcpp::DT tag
, const Symbol
* sym
)
2270 : tag_(tag
), offset_(DYNAMIC_SYMBOL
)
2271 { this->u_
.sym
= sym
; }
2273 // Create an entry with a string.
2274 Dynamic_entry(elfcpp::DT tag
, const char* str
)
2275 : tag_(tag
), offset_(DYNAMIC_STRING
)
2276 { this->u_
.str
= str
; }
2278 // Return the tag of this entry.
2281 { return this->tag_
; }
2283 // Write the dynamic entry to an output view.
2284 template<int size
, bool big_endian
>
2286 write(unsigned char* pov
, const Stringpool
*) const;
2289 // Classification is encoded in the OFFSET field.
2293 DYNAMIC_SECTION_ADDRESS
= 0,
2295 DYNAMIC_NUMBER
= -1U,
2297 DYNAMIC_SECTION_SIZE
= -2U,
2299 DYNAMIC_SYMBOL
= -3U,
2301 DYNAMIC_STRING
= -4U
2302 // Any other value indicates a section address plus OFFSET.
2307 // For DYNAMIC_NUMBER.
2309 // For DYNAMIC_SECTION_SIZE and section address plus OFFSET.
2310 const Output_data
* od
;
2311 // For DYNAMIC_SYMBOL.
2313 // For DYNAMIC_STRING.
2316 // For DYNAMIC_SYMBOL with two sections.
2317 const Output_data
* od2
;
2320 // The type of entry (Classification) or offset within a section.
2321 unsigned int offset_
;
2324 // Add an entry to the list.
2326 add_entry(const Dynamic_entry
& entry
)
2327 { this->entries_
.push_back(entry
); }
2329 // Sized version of write function.
2330 template<int size
, bool big_endian
>
2332 sized_write(Output_file
* of
);
2334 // The type of the list of entries.
2335 typedef std::vector
<Dynamic_entry
> Dynamic_entries
;
2338 Dynamic_entries entries_
;
2339 // The pool used for strings.
2343 // Output_symtab_xindex is used to handle SHT_SYMTAB_SHNDX sections,
2344 // which may be required if the object file has more than
2345 // SHN_LORESERVE sections.
2347 class Output_symtab_xindex
: public Output_section_data
2350 Output_symtab_xindex(size_t symcount
)
2351 : Output_section_data(symcount
* 4, 4, true),
2355 // Add an entry: symbol number SYMNDX has section SHNDX.
2357 add(unsigned int symndx
, unsigned int shndx
)
2358 { this->entries_
.push_back(std::make_pair(symndx
, shndx
)); }
2362 do_write(Output_file
*);
2364 // Write to a map file.
2366 do_print_to_mapfile(Mapfile
* mapfile
) const
2367 { mapfile
->print_output_data(this, _("** symtab xindex")); }
2370 template<bool big_endian
>
2372 endian_do_write(unsigned char*);
2374 // It is likely that most symbols will not require entries. Rather
2375 // than keep a vector for all symbols, we keep pairs of symbol index
2376 // and section index.
2377 typedef std::vector
<std::pair
<unsigned int, unsigned int> > Xindex_entries
;
2379 // The entries we need.
2380 Xindex_entries entries_
;
2383 // A relaxed input section.
2384 class Output_relaxed_input_section
: public Output_section_data_build
2387 // We would like to call relobj->section_addralign(shndx) to get the
2388 // alignment but we do not want the constructor to fail. So callers
2389 // are repsonsible for ensuring that.
2390 Output_relaxed_input_section(Relobj
* relobj
, unsigned int shndx
,
2392 : Output_section_data_build(addralign
), relobj_(relobj
), shndx_(shndx
)
2395 // Return the Relobj of this relaxed input section.
2398 { return this->relobj_
; }
2400 // Return the section index of this relaxed input section.
2403 { return this->shndx_
; }
2407 unsigned int shndx_
;
2410 // This class describes properties of merge data sections. It is used
2411 // as a key type for maps.
2412 class Merge_section_properties
2415 Merge_section_properties(bool is_string
, uint64_t entsize
,
2417 : is_string_(is_string
), entsize_(entsize
), addralign_(addralign
)
2420 // Whether this equals to another Merge_section_properties MSP.
2422 eq(const Merge_section_properties
& msp
) const
2424 return ((this->is_string_
== msp
.is_string_
)
2425 && (this->entsize_
== msp
.entsize_
)
2426 && (this->addralign_
== msp
.addralign_
));
2429 // Compute a hash value for this using 64-bit FNV-1a hash.
2433 uint64_t h
= 14695981039346656037ULL; // FNV offset basis.
2434 uint64_t prime
= 1099511628211ULL;
2435 h
= (h
^ static_cast<uint64_t>(this->is_string_
)) * prime
;
2436 h
= (h
^ static_cast<uint64_t>(this->entsize_
)) * prime
;
2437 h
= (h
^ static_cast<uint64_t>(this->addralign_
)) * prime
;
2441 // Functors for associative containers.
2445 operator()(const Merge_section_properties
& msp1
,
2446 const Merge_section_properties
& msp2
) const
2447 { return msp1
.eq(msp2
); }
2453 operator()(const Merge_section_properties
& msp
) const
2454 { return msp
.hash_value(); }
2458 // Whether this merge data section is for strings.
2460 // Entsize of this merge data section.
2462 // Address alignment.
2463 uint64_t addralign_
;
2466 // This class is used to speed up look up of special input sections in an
2469 class Output_section_lookup_maps
2472 Output_section_lookup_maps()
2473 : is_valid_(true), merge_sections_by_properties_(),
2474 merge_sections_by_id_(), relaxed_input_sections_by_id_()
2477 // Whether the maps are valid.
2480 { return this->is_valid_
; }
2482 // Invalidate the maps.
2485 { this->is_valid_
= false; }
2491 this->merge_sections_by_properties_
.clear();
2492 this->merge_sections_by_id_
.clear();
2493 this->relaxed_input_sections_by_id_
.clear();
2494 // A cleared map is valid.
2495 this->is_valid_
= true;
2498 // Find a merge section by merge section properties. Return NULL if none
2501 find_merge_section(const Merge_section_properties
& msp
) const
2503 gold_assert(this->is_valid_
);
2504 Merge_sections_by_properties::const_iterator p
=
2505 this->merge_sections_by_properties_
.find(msp
);
2506 return p
!= this->merge_sections_by_properties_
.end() ? p
->second
: NULL
;
2509 // Find a merge section by section ID of a merge input section. Return NULL
2510 // if none is found.
2512 find_merge_section(const Object
* object
, unsigned int shndx
) const
2514 gold_assert(this->is_valid_
);
2515 Merge_sections_by_id::const_iterator p
=
2516 this->merge_sections_by_id_
.find(Const_section_id(object
, shndx
));
2517 return p
!= this->merge_sections_by_id_
.end() ? p
->second
: NULL
;
2520 // Add a merge section pointed by POMB with properties MSP.
2522 add_merge_section(const Merge_section_properties
& msp
,
2523 Output_merge_base
* pomb
)
2525 std::pair
<Merge_section_properties
, Output_merge_base
*> value(msp
, pomb
);
2526 std::pair
<Merge_sections_by_properties::iterator
, bool> result
=
2527 this->merge_sections_by_properties_
.insert(value
);
2528 gold_assert(result
.second
);
2531 // Add a mapping from a merged input section in OBJECT with index SHNDX
2532 // to a merge output section pointed by POMB.
2534 add_merge_input_section(const Object
* object
, unsigned int shndx
,
2535 Output_merge_base
* pomb
)
2537 Const_section_id
csid(object
, shndx
);
2538 std::pair
<Const_section_id
, Output_merge_base
*> value(csid
, pomb
);
2539 std::pair
<Merge_sections_by_id::iterator
, bool> result
=
2540 this->merge_sections_by_id_
.insert(value
);
2541 gold_assert(result
.second
);
2544 // Find a relaxed input section of OBJECT with index SHNDX.
2545 Output_relaxed_input_section
*
2546 find_relaxed_input_section(const Object
* object
, unsigned int shndx
) const
2548 gold_assert(this->is_valid_
);
2549 Relaxed_input_sections_by_id::const_iterator p
=
2550 this->relaxed_input_sections_by_id_
.find(Const_section_id(object
, shndx
));
2551 return p
!= this->relaxed_input_sections_by_id_
.end() ? p
->second
: NULL
;
2554 // Add a relaxed input section pointed by POMB and whose original input
2555 // section is in OBJECT with index SHNDX.
2557 add_relaxed_input_section(const Relobj
* relobj
, unsigned int shndx
,
2558 Output_relaxed_input_section
* poris
)
2560 Const_section_id
csid(relobj
, shndx
);
2561 std::pair
<Const_section_id
, Output_relaxed_input_section
*>
2563 std::pair
<Relaxed_input_sections_by_id::iterator
, bool> result
=
2564 this->relaxed_input_sections_by_id_
.insert(value
);
2565 gold_assert(result
.second
);
2569 typedef Unordered_map
<Const_section_id
, Output_merge_base
*,
2570 Const_section_id_hash
>
2571 Merge_sections_by_id
;
2573 typedef Unordered_map
<Merge_section_properties
, Output_merge_base
*,
2574 Merge_section_properties::hash
,
2575 Merge_section_properties::equal_to
>
2576 Merge_sections_by_properties
;
2578 typedef Unordered_map
<Const_section_id
, Output_relaxed_input_section
*,
2579 Const_section_id_hash
>
2580 Relaxed_input_sections_by_id
;
2582 // Whether this is valid
2584 // Merge sections by merge section properties.
2585 Merge_sections_by_properties merge_sections_by_properties_
;
2586 // Merge sections by section IDs.
2587 Merge_sections_by_id merge_sections_by_id_
;
2588 // Relaxed sections by section IDs.
2589 Relaxed_input_sections_by_id relaxed_input_sections_by_id_
;
2592 // An output section. We don't expect to have too many output
2593 // sections, so we don't bother to do a template on the size.
2595 class Output_section
: public Output_data
2598 // Create an output section, giving the name, type, and flags.
2599 Output_section(const char* name
, elfcpp::Elf_Word
, elfcpp::Elf_Xword
);
2600 virtual ~Output_section();
2602 // Add a new input section SHNDX, named NAME, with header SHDR, from
2603 // object OBJECT. RELOC_SHNDX is the index of a relocation section
2604 // which applies to this section, or 0 if none, or -1 if more than
2605 // one. HAVE_SECTIONS_SCRIPT is true if we have a SECTIONS clause
2606 // in a linker script; in that case we need to keep track of input
2607 // sections associated with an output section. Return the offset
2608 // within the output section.
2609 template<int size
, bool big_endian
>
2611 add_input_section(Layout
* layout
, Sized_relobj
<size
, big_endian
>* object
,
2612 unsigned int shndx
, const char* name
,
2613 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
2614 unsigned int reloc_shndx
, bool have_sections_script
);
2616 // Add generated data POSD to this output section.
2618 add_output_section_data(Output_section_data
* posd
);
2620 // Add a relaxed input section PORIS called NAME to this output section
2623 add_relaxed_input_section(Layout
* layout
,
2624 Output_relaxed_input_section
* poris
,
2625 const std::string
& name
);
2627 // Return the section name.
2630 { return this->name_
; }
2632 // Return the section type.
2635 { return this->type_
; }
2637 // Return the section flags.
2640 { return this->flags_
; }
2642 // Update the output section flags based on input section flags.
2644 update_flags_for_input_section(elfcpp::Elf_Xword flags
);
2646 // Return the entsize field.
2649 { return this->entsize_
; }
2651 // Set the entsize field.
2653 set_entsize(uint64_t v
);
2655 // Set the load address.
2657 set_load_address(uint64_t load_address
)
2659 this->load_address_
= load_address
;
2660 this->has_load_address_
= true;
2663 // Set the link field to the output section index of a section.
2665 set_link_section(const Output_data
* od
)
2667 gold_assert(this->link_
== 0
2668 && !this->should_link_to_symtab_
2669 && !this->should_link_to_dynsym_
);
2670 this->link_section_
= od
;
2673 // Set the link field to a constant.
2675 set_link(unsigned int v
)
2677 gold_assert(this->link_section_
== NULL
2678 && !this->should_link_to_symtab_
2679 && !this->should_link_to_dynsym_
);
2683 // Record that this section should link to the normal symbol table.
2685 set_should_link_to_symtab()
2687 gold_assert(this->link_section_
== NULL
2689 && !this->should_link_to_dynsym_
);
2690 this->should_link_to_symtab_
= true;
2693 // Record that this section should link to the dynamic symbol table.
2695 set_should_link_to_dynsym()
2697 gold_assert(this->link_section_
== NULL
2699 && !this->should_link_to_symtab_
);
2700 this->should_link_to_dynsym_
= true;
2703 // Return the info field.
2707 gold_assert(this->info_section_
== NULL
2708 && this->info_symndx_
== NULL
);
2712 // Set the info field to the output section index of a section.
2714 set_info_section(const Output_section
* os
)
2716 gold_assert((this->info_section_
== NULL
2717 || (this->info_section_
== os
2718 && this->info_uses_section_index_
))
2719 && this->info_symndx_
== NULL
2720 && this->info_
== 0);
2721 this->info_section_
= os
;
2722 this->info_uses_section_index_
= true;
2725 // Set the info field to the symbol table index of a symbol.
2727 set_info_symndx(const Symbol
* sym
)
2729 gold_assert(this->info_section_
== NULL
2730 && (this->info_symndx_
== NULL
2731 || this->info_symndx_
== sym
)
2732 && this->info_
== 0);
2733 this->info_symndx_
= sym
;
2736 // Set the info field to the symbol table index of a section symbol.
2738 set_info_section_symndx(const Output_section
* os
)
2740 gold_assert((this->info_section_
== NULL
2741 || (this->info_section_
== os
2742 && !this->info_uses_section_index_
))
2743 && this->info_symndx_
== NULL
2744 && this->info_
== 0);
2745 this->info_section_
= os
;
2746 this->info_uses_section_index_
= false;
2749 // Set the info field to a constant.
2751 set_info(unsigned int v
)
2753 gold_assert(this->info_section_
== NULL
2754 && this->info_symndx_
== NULL
2755 && (this->info_
== 0
2756 || this->info_
== v
));
2760 // Set the addralign field.
2762 set_addralign(uint64_t v
)
2763 { this->addralign_
= v
; }
2765 // Whether the output section index has been set.
2767 has_out_shndx() const
2768 { return this->out_shndx_
!= -1U; }
2770 // Indicate that we need a symtab index.
2772 set_needs_symtab_index()
2773 { this->needs_symtab_index_
= true; }
2775 // Return whether we need a symtab index.
2777 needs_symtab_index() const
2778 { return this->needs_symtab_index_
; }
2780 // Get the symtab index.
2782 symtab_index() const
2784 gold_assert(this->symtab_index_
!= 0);
2785 return this->symtab_index_
;
2788 // Set the symtab index.
2790 set_symtab_index(unsigned int index
)
2792 gold_assert(index
!= 0);
2793 this->symtab_index_
= index
;
2796 // Indicate that we need a dynsym index.
2798 set_needs_dynsym_index()
2799 { this->needs_dynsym_index_
= true; }
2801 // Return whether we need a dynsym index.
2803 needs_dynsym_index() const
2804 { return this->needs_dynsym_index_
; }
2806 // Get the dynsym index.
2808 dynsym_index() const
2810 gold_assert(this->dynsym_index_
!= 0);
2811 return this->dynsym_index_
;
2814 // Set the dynsym index.
2816 set_dynsym_index(unsigned int index
)
2818 gold_assert(index
!= 0);
2819 this->dynsym_index_
= index
;
2822 // Return whether the input sections sections attachd to this output
2823 // section may require sorting. This is used to handle constructor
2824 // priorities compatibly with GNU ld.
2826 may_sort_attached_input_sections() const
2827 { return this->may_sort_attached_input_sections_
; }
2829 // Record that the input sections attached to this output section
2830 // may require sorting.
2832 set_may_sort_attached_input_sections()
2833 { this->may_sort_attached_input_sections_
= true; }
2835 // Returns true if input sections must be sorted according to the
2836 // order in which their name appear in the --section-ordering-file.
2838 input_section_order_specified()
2839 { return this->input_section_order_specified_
; }
2841 // Record that input sections must be sorted as some of their names
2842 // match the patterns specified through --section-ordering-file.
2844 set_input_section_order_specified()
2845 { this->input_section_order_specified_
= true; }
2847 // Return whether the input sections attached to this output section
2848 // require sorting. This is used to handle constructor priorities
2849 // compatibly with GNU ld.
2851 must_sort_attached_input_sections() const
2852 { return this->must_sort_attached_input_sections_
; }
2854 // Record that the input sections attached to this output section
2857 set_must_sort_attached_input_sections()
2858 { this->must_sort_attached_input_sections_
= true; }
2860 // Get the order in which this section appears in the PT_LOAD output
2862 Output_section_order
2864 { return this->order_
; }
2866 // Set the order for this section.
2868 set_order(Output_section_order order
)
2869 { this->order_
= order
; }
2871 // Return whether this section holds relro data--data which has
2872 // dynamic relocations but which may be marked read-only after the
2873 // dynamic relocations have been completed.
2876 { return this->is_relro_
; }
2878 // Record that this section holds relro data.
2881 { this->is_relro_
= true; }
2883 // Record that this section does not hold relro data.
2886 { this->is_relro_
= false; }
2888 // True if this is a small section: a section which holds small
2891 is_small_section() const
2892 { return this->is_small_section_
; }
2894 // Record that this is a small section.
2896 set_is_small_section()
2897 { this->is_small_section_
= true; }
2899 // True if this is a large section: a section which holds large
2902 is_large_section() const
2903 { return this->is_large_section_
; }
2905 // Record that this is a large section.
2907 set_is_large_section()
2908 { this->is_large_section_
= true; }
2910 // True if this is a large data (not BSS) section.
2912 is_large_data_section()
2913 { return this->is_large_section_
&& this->type_
!= elfcpp::SHT_NOBITS
; }
2915 // Return whether this section should be written after all the input
2916 // sections are complete.
2918 after_input_sections() const
2919 { return this->after_input_sections_
; }
2921 // Record that this section should be written after all the input
2922 // sections are complete.
2924 set_after_input_sections()
2925 { this->after_input_sections_
= true; }
2927 // Return whether this section requires postprocessing after all
2928 // relocations have been applied.
2930 requires_postprocessing() const
2931 { return this->requires_postprocessing_
; }
2933 // If a section requires postprocessing, return the buffer to use.
2935 postprocessing_buffer() const
2937 gold_assert(this->postprocessing_buffer_
!= NULL
);
2938 return this->postprocessing_buffer_
;
2941 // If a section requires postprocessing, create the buffer to use.
2943 create_postprocessing_buffer();
2945 // If a section requires postprocessing, this is the size of the
2946 // buffer to which relocations should be applied.
2948 postprocessing_buffer_size() const
2949 { return this->current_data_size_for_child(); }
2951 // Modify the section name. This is only permitted for an
2952 // unallocated section, and only before the size has been finalized.
2953 // Otherwise the name will not get into Layout::namepool_.
2955 set_name(const char* newname
)
2957 gold_assert((this->flags_
& elfcpp::SHF_ALLOC
) == 0);
2958 gold_assert(!this->is_data_size_valid());
2959 this->name_
= newname
;
2962 // Return whether the offset OFFSET in the input section SHNDX in
2963 // object OBJECT is being included in the link.
2965 is_input_address_mapped(const Relobj
* object
, unsigned int shndx
,
2966 off_t offset
) const;
2968 // Return the offset within the output section of OFFSET relative to
2969 // the start of input section SHNDX in object OBJECT.
2971 output_offset(const Relobj
* object
, unsigned int shndx
,
2972 section_offset_type offset
) const;
2974 // Return the output virtual address of OFFSET relative to the start
2975 // of input section SHNDX in object OBJECT.
2977 output_address(const Relobj
* object
, unsigned int shndx
,
2978 off_t offset
) const;
2980 // Look for the merged section for input section SHNDX in object
2981 // OBJECT. If found, return true, and set *ADDR to the address of
2982 // the start of the merged section. This is not necessary the
2983 // output offset corresponding to input offset 0 in the section,
2984 // since the section may be mapped arbitrarily.
2986 find_starting_output_address(const Relobj
* object
, unsigned int shndx
,
2987 uint64_t* addr
) const;
2989 // Record that this output section was found in the SECTIONS clause
2990 // of a linker script.
2992 set_found_in_sections_clause()
2993 { this->found_in_sections_clause_
= true; }
2995 // Return whether this output section was found in the SECTIONS
2996 // clause of a linker script.
2998 found_in_sections_clause() const
2999 { return this->found_in_sections_clause_
; }
3001 // Write the section header into *OPHDR.
3002 template<int size
, bool big_endian
>
3004 write_header(const Layout
*, const Stringpool
*,
3005 elfcpp::Shdr_write
<size
, big_endian
>*) const;
3007 // The next few calls are for linker script support.
3009 // In some cases we need to keep a list of the input sections
3010 // associated with this output section. We only need the list if we
3011 // might have to change the offsets of the input section within the
3012 // output section after we add the input section. The ordinary
3013 // input sections will be written out when we process the object
3014 // file, and as such we don't need to track them here. We do need
3015 // to track Output_section_data objects here. We store instances of
3016 // this structure in a std::vector, so it must be a POD. There can
3017 // be many instances of this structure, so we use a union to save
3023 : shndx_(0), p2align_(0)
3025 this->u1_
.data_size
= 0;
3026 this->u2_
.object
= NULL
;
3029 // For an ordinary input section.
3030 Input_section(Relobj
* object
, unsigned int shndx
, off_t data_size
,
3033 p2align_(ffsll(static_cast<long long>(addralign
))),
3034 section_order_index_(0)
3036 gold_assert(shndx
!= OUTPUT_SECTION_CODE
3037 && shndx
!= MERGE_DATA_SECTION_CODE
3038 && shndx
!= MERGE_STRING_SECTION_CODE
3039 && shndx
!= RELAXED_INPUT_SECTION_CODE
);
3040 this->u1_
.data_size
= data_size
;
3041 this->u2_
.object
= object
;
3044 // For a non-merge output section.
3045 Input_section(Output_section_data
* posd
)
3046 : shndx_(OUTPUT_SECTION_CODE
), p2align_(0),
3047 section_order_index_(0)
3049 this->u1_
.data_size
= 0;
3050 this->u2_
.posd
= posd
;
3053 // For a merge section.
3054 Input_section(Output_section_data
* posd
, bool is_string
, uint64_t entsize
)
3056 ? MERGE_STRING_SECTION_CODE
3057 : MERGE_DATA_SECTION_CODE
),
3059 section_order_index_(0)
3061 this->u1_
.entsize
= entsize
;
3062 this->u2_
.posd
= posd
;
3065 // For a relaxed input section.
3066 Input_section(Output_relaxed_input_section
* psection
)
3067 : shndx_(RELAXED_INPUT_SECTION_CODE
), p2align_(0),
3068 section_order_index_(0)
3070 this->u1_
.data_size
= 0;
3071 this->u2_
.poris
= psection
;
3075 section_order_index() const
3077 return this->section_order_index_
;
3081 set_section_order_index(unsigned int number
)
3083 this->section_order_index_
= number
;
3086 // The required alignment.
3090 if (this->p2align_
!= 0)
3091 return static_cast<uint64_t>(1) << (this->p2align_
- 1);
3092 else if (!this->is_input_section())
3093 return this->u2_
.posd
->addralign();
3098 // Set the required alignment, which must be either 0 or a power of 2.
3099 // For input sections that are sub-classes of Output_section_data, a
3100 // alignment of zero means asking the underlying object for alignment.
3102 set_addralign(uint64_t addralign
)
3108 gold_assert((addralign
& (addralign
- 1)) == 0);
3109 this->p2align_
= ffsll(static_cast<long long>(addralign
));
3113 // Return the current required size, without finalization.
3115 current_data_size() const;
3117 // Return the required size.
3121 // Whether this is an input section.
3123 is_input_section() const
3125 return (this->shndx_
!= OUTPUT_SECTION_CODE
3126 && this->shndx_
!= MERGE_DATA_SECTION_CODE
3127 && this->shndx_
!= MERGE_STRING_SECTION_CODE
3128 && this->shndx_
!= RELAXED_INPUT_SECTION_CODE
);
3131 // Return whether this is a merge section which matches the
3134 is_merge_section(bool is_string
, uint64_t entsize
,
3135 uint64_t addralign
) const
3137 return (this->shndx_
== (is_string
3138 ? MERGE_STRING_SECTION_CODE
3139 : MERGE_DATA_SECTION_CODE
)
3140 && this->u1_
.entsize
== entsize
3141 && this->addralign() == addralign
);
3144 // Return whether this is a merge section for some input section.
3146 is_merge_section() const
3148 return (this->shndx_
== MERGE_DATA_SECTION_CODE
3149 || this->shndx_
== MERGE_STRING_SECTION_CODE
);
3152 // Return whether this is a relaxed input section.
3154 is_relaxed_input_section() const
3155 { return this->shndx_
== RELAXED_INPUT_SECTION_CODE
; }
3157 // Return whether this is a generic Output_section_data.
3159 is_output_section_data() const
3161 return this->shndx_
== OUTPUT_SECTION_CODE
;
3164 // Return the object for an input section.
3168 // Return the input section index for an input section.
3172 // For non-input-sections, return the associated Output_section_data
3174 Output_section_data
*
3175 output_section_data() const
3177 gold_assert(!this->is_input_section());
3178 return this->u2_
.posd
;
3181 // For a merge section, return the Output_merge_base pointer.
3183 output_merge_base() const
3185 gold_assert(this->is_merge_section());
3186 return this->u2_
.pomb
;
3189 // Return the Output_relaxed_input_section object.
3190 Output_relaxed_input_section
*
3191 relaxed_input_section() const
3193 gold_assert(this->is_relaxed_input_section());
3194 return this->u2_
.poris
;
3197 // Set the output section.
3199 set_output_section(Output_section
* os
)
3201 gold_assert(!this->is_input_section());
3202 Output_section_data
* posd
=
3203 this->is_relaxed_input_section() ? this->u2_
.poris
: this->u2_
.posd
;
3204 posd
->set_output_section(os
);
3207 // Set the address and file offset. This is called during
3208 // Layout::finalize. SECTION_FILE_OFFSET is the file offset of
3209 // the enclosing section.
3211 set_address_and_file_offset(uint64_t address
, off_t file_offset
,
3212 off_t section_file_offset
);
3214 // Reset the address and file offset.
3216 reset_address_and_file_offset();
3218 // Finalize the data size.
3220 finalize_data_size();
3222 // Add an input section, for SHF_MERGE sections.
3224 add_input_section(Relobj
* object
, unsigned int shndx
)
3226 gold_assert(this->shndx_
== MERGE_DATA_SECTION_CODE
3227 || this->shndx_
== MERGE_STRING_SECTION_CODE
);
3228 return this->u2_
.posd
->add_input_section(object
, shndx
);
3231 // Given an input OBJECT, an input section index SHNDX within that
3232 // object, and an OFFSET relative to the start of that input
3233 // section, return whether or not the output offset is known. If
3234 // this function returns true, it sets *POUTPUT to the offset in
3235 // the output section, relative to the start of the input section
3236 // in the output section. *POUTPUT may be different from OFFSET
3237 // for a merged section.
3239 output_offset(const Relobj
* object
, unsigned int shndx
,
3240 section_offset_type offset
,
3241 section_offset_type
* poutput
) const;
3243 // Return whether this is the merge section for the input section
3246 is_merge_section_for(const Relobj
* object
, unsigned int shndx
) const;
3248 // Write out the data. This does nothing for an input section.
3250 write(Output_file
*);
3252 // Write the data to a buffer. This does nothing for an input
3255 write_to_buffer(unsigned char*);
3257 // Print to a map file.
3259 print_to_mapfile(Mapfile
*) const;
3261 // Print statistics about merge sections to stderr.
3263 print_merge_stats(const char* section_name
)
3265 if (this->shndx_
== MERGE_DATA_SECTION_CODE
3266 || this->shndx_
== MERGE_STRING_SECTION_CODE
)
3267 this->u2_
.posd
->print_merge_stats(section_name
);
3271 // Code values which appear in shndx_. If the value is not one of
3272 // these codes, it is the input section index in the object file.
3275 // An Output_section_data.
3276 OUTPUT_SECTION_CODE
= -1U,
3277 // An Output_section_data for an SHF_MERGE section with
3278 // SHF_STRINGS not set.
3279 MERGE_DATA_SECTION_CODE
= -2U,
3280 // An Output_section_data for an SHF_MERGE section with
3282 MERGE_STRING_SECTION_CODE
= -3U,
3283 // An Output_section_data for a relaxed input section.
3284 RELAXED_INPUT_SECTION_CODE
= -4U
3287 // For an ordinary input section, this is the section index in the
3288 // input file. For an Output_section_data, this is
3289 // OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
3290 // MERGE_STRING_SECTION_CODE.
3291 unsigned int shndx_
;
3292 // The required alignment, stored as a power of 2.
3293 unsigned int p2align_
;
3296 // For an ordinary input section, the section size.
3298 // For OUTPUT_SECTION_CODE or RELAXED_INPUT_SECTION_CODE, this is not
3299 // used. For MERGE_DATA_SECTION_CODE or MERGE_STRING_SECTION_CODE, the
3305 // For an ordinary input section, the object which holds the
3308 // For OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
3309 // MERGE_STRING_SECTION_CODE, the data.
3310 Output_section_data
* posd
;
3311 Output_merge_base
* pomb
;
3312 // For RELAXED_INPUT_SECTION_CODE, the data.
3313 Output_relaxed_input_section
* poris
;
3315 // The line number of the pattern it matches in the --section-ordering-file
3316 // file. It is 0 if does not match any pattern.
3317 unsigned int section_order_index_
;
3320 // Store the list of input sections for this Output_section into the
3321 // list passed in. This removes the input sections, leaving only
3322 // any Output_section_data elements. This returns the size of those
3323 // Output_section_data elements. ADDRESS is the address of this
3324 // output section. FILL is the fill value to use, in case there are
3325 // any spaces between the remaining Output_section_data elements.
3327 get_input_sections(uint64_t address
, const std::string
& fill
,
3328 std::list
<Input_section
>*);
3330 // Add a script input section. A script input section can either be
3331 // a plain input section or a sub-class of Output_section_data.
3333 add_script_input_section(const Input_section
& input_section
);
3335 // Set the current size of the output section.
3337 set_current_data_size(off_t size
)
3338 { this->set_current_data_size_for_child(size
); }
3340 // End of linker script support.
3342 // Save states before doing section layout.
3343 // This is used for relaxation.
3347 // Restore states prior to section layout.
3355 // Convert existing input sections to relaxed input sections.
3357 convert_input_sections_to_relaxed_sections(
3358 const std::vector
<Output_relaxed_input_section
*>& sections
);
3360 // Find a relaxed input section to an input section in OBJECT
3361 // with index SHNDX. Return NULL if none is found.
3362 const Output_relaxed_input_section
*
3363 find_relaxed_input_section(const Relobj
* object
, unsigned int shndx
) const;
3365 // Whether section offsets need adjustment due to relaxation.
3367 section_offsets_need_adjustment() const
3368 { return this->section_offsets_need_adjustment_
; }
3370 // Set section_offsets_need_adjustment to be true.
3372 set_section_offsets_need_adjustment()
3373 { this->section_offsets_need_adjustment_
= true; }
3375 // Adjust section offsets of input sections in this. This is
3376 // requires if relaxation caused some input sections to change sizes.
3378 adjust_section_offsets();
3380 // Whether this is a NOLOAD section.
3383 { return this->is_noload_
; }
3388 { this->is_noload_
= true; }
3390 // Print merge statistics to stderr.
3392 print_merge_stats();
3394 // Set a fixed layout for the section. Used for incremental update links.
3396 set_fixed_layout(uint64_t sh_addr
, off_t sh_offset
, off_t sh_size
,
3397 uint64_t sh_addralign
);
3399 // Return TRUE if the section has a fixed layout.
3401 has_fixed_layout() const
3402 { return this->has_fixed_layout_
; }
3404 // Reserve space within the fixed layout for the section. Used for
3405 // incremental update links.
3407 reserve(uint64_t sh_offset
, uint64_t sh_size
);
3410 // Return the output section--i.e., the object itself.
3415 const Output_section
*
3416 do_output_section() const
3419 // Return the section index in the output file.
3421 do_out_shndx() const
3423 gold_assert(this->out_shndx_
!= -1U);
3424 return this->out_shndx_
;
3427 // Set the output section index.
3429 do_set_out_shndx(unsigned int shndx
)
3431 gold_assert(this->out_shndx_
== -1U || this->out_shndx_
== shndx
);
3432 this->out_shndx_
= shndx
;
3435 // Update the data size of the Output_section. For a typical
3436 // Output_section, there is nothing to do, but if there are any
3437 // Output_section_data objects we need to do a trial layout
3442 // Set the final data size of the Output_section. For a typical
3443 // Output_section, there is nothing to do, but if there are any
3444 // Output_section_data objects we need to set their final addresses
3447 set_final_data_size();
3449 // Reset the address and file offset.
3451 do_reset_address_and_file_offset();
3453 // Return true if address and file offset already have reset values. In
3454 // other words, calling reset_address_and_file_offset will not change them.
3456 do_address_and_file_offset_have_reset_values() const;
3458 // Write the data to the file. For a typical Output_section, this
3459 // does nothing: the data is written out by calling Object::Relocate
3460 // on each input object. But if there are any Output_section_data
3461 // objects we do need to write them out here.
3463 do_write(Output_file
*);
3465 // Return the address alignment--function required by parent class.
3467 do_addralign() const
3468 { return this->addralign_
; }
3470 // Return whether there is a load address.
3472 do_has_load_address() const
3473 { return this->has_load_address_
; }
3475 // Return the load address.
3477 do_load_address() const
3479 gold_assert(this->has_load_address_
);
3480 return this->load_address_
;
3483 // Return whether this is an Output_section.
3485 do_is_section() const
3488 // Return whether this is a section of the specified type.
3490 do_is_section_type(elfcpp::Elf_Word type
) const
3491 { return this->type_
== type
; }
3493 // Return whether the specified section flag is set.
3495 do_is_section_flag_set(elfcpp::Elf_Xword flag
) const
3496 { return (this->flags_
& flag
) != 0; }
3498 // Set the TLS offset. Called only for SHT_TLS sections.
3500 do_set_tls_offset(uint64_t tls_base
);
3502 // Return the TLS offset, relative to the base of the TLS segment.
3503 // Valid only for SHT_TLS sections.
3505 do_tls_offset() const
3506 { return this->tls_offset_
; }
3508 // This may be implemented by a child class.
3510 do_finalize_name(Layout
*)
3513 // Print to the map file.
3515 do_print_to_mapfile(Mapfile
*) const;
3517 // Record that this section requires postprocessing after all
3518 // relocations have been applied. This is called by a child class.
3520 set_requires_postprocessing()
3522 this->requires_postprocessing_
= true;
3523 this->after_input_sections_
= true;
3526 // Write all the data of an Output_section into the postprocessing
3529 write_to_postprocessing_buffer();
3531 typedef std::vector
<Input_section
> Input_section_list
;
3533 // Allow a child class to access the input sections.
3534 const Input_section_list
&
3535 input_sections() const
3536 { return this->input_sections_
; }
3538 // Whether this always keeps an input section list
3540 always_keeps_input_sections() const
3541 { return this->always_keeps_input_sections_
; }
3543 // Always keep an input section list.
3545 set_always_keeps_input_sections()
3547 gold_assert(this->current_data_size_for_child() == 0);
3548 this->always_keeps_input_sections_
= true;
3552 // We only save enough information to undo the effects of section layout.
3553 class Checkpoint_output_section
3556 Checkpoint_output_section(uint64_t addralign
, elfcpp::Elf_Xword flags
,
3557 const Input_section_list
& input_sections
,
3558 off_t first_input_offset
,
3559 bool attached_input_sections_are_sorted
)
3560 : addralign_(addralign
), flags_(flags
),
3561 input_sections_(input_sections
),
3562 input_sections_size_(input_sections_
.size()),
3563 input_sections_copy_(), first_input_offset_(first_input_offset
),
3564 attached_input_sections_are_sorted_(attached_input_sections_are_sorted
)
3568 ~Checkpoint_output_section()
3571 // Return the address alignment.
3574 { return this->addralign_
; }
3576 // Return the section flags.
3579 { return this->flags_
; }
3581 // Return a reference to the input section list copy.
3584 { return &this->input_sections_copy_
; }
3586 // Return the size of input_sections at the time when checkpoint is
3589 input_sections_size() const
3590 { return this->input_sections_size_
; }
3592 // Whether input sections are copied.
3594 input_sections_saved() const
3595 { return this->input_sections_copy_
.size() == this->input_sections_size_
; }
3598 first_input_offset() const
3599 { return this->first_input_offset_
; }
3602 attached_input_sections_are_sorted() const
3603 { return this->attached_input_sections_are_sorted_
; }
3605 // Save input sections.
3607 save_input_sections()
3609 this->input_sections_copy_
.reserve(this->input_sections_size_
);
3610 this->input_sections_copy_
.clear();
3611 Input_section_list::const_iterator p
= this->input_sections_
.begin();
3612 gold_assert(this->input_sections_size_
>= this->input_sections_
.size());
3613 for(size_t i
= 0; i
< this->input_sections_size_
; i
++, ++p
)
3614 this->input_sections_copy_
.push_back(*p
);
3618 // The section alignment.
3619 uint64_t addralign_
;
3620 // The section flags.
3621 elfcpp::Elf_Xword flags_
;
3622 // Reference to the input sections to be checkpointed.
3623 const Input_section_list
& input_sections_
;
3624 // Size of the checkpointed portion of input_sections_;
3625 size_t input_sections_size_
;
3626 // Copy of input sections.
3627 Input_section_list input_sections_copy_
;
3628 // The offset of the first entry in input_sections_.
3629 off_t first_input_offset_
;
3630 // True if the input sections attached to this output section have
3631 // already been sorted.
3632 bool attached_input_sections_are_sorted_
;
3635 // This class is used to sort the input sections.
3636 class Input_section_sort_entry
;
3638 // This is the sort comparison function for ctors and dtors.
3639 struct Input_section_sort_compare
3642 operator()(const Input_section_sort_entry
&,
3643 const Input_section_sort_entry
&) const;
3646 // This is the sort comparison function for .init_array and .fini_array.
3647 struct Input_section_sort_init_fini_compare
3650 operator()(const Input_section_sort_entry
&,
3651 const Input_section_sort_entry
&) const;
3654 // This is the sort comparison function when a section order is specified
3655 // from an input file.
3656 struct Input_section_sort_section_order_index_compare
3659 operator()(const Input_section_sort_entry
&,
3660 const Input_section_sort_entry
&) const;
3663 // Fill data. This is used to fill in data between input sections.
3664 // It is also used for data statements (BYTE, WORD, etc.) in linker
3665 // scripts. When we have to keep track of the input sections, we
3666 // can use an Output_data_const, but we don't want to have to keep
3667 // track of input sections just to implement fills.
3671 Fill(off_t section_offset
, off_t length
)
3672 : section_offset_(section_offset
),
3673 length_(convert_to_section_size_type(length
))
3676 // Return section offset.
3678 section_offset() const
3679 { return this->section_offset_
; }
3681 // Return fill length.
3684 { return this->length_
; }
3687 // The offset within the output section.
3688 off_t section_offset_
;
3689 // The length of the space to fill.
3690 section_size_type length_
;
3693 typedef std::vector
<Fill
> Fill_list
;
3695 // Map used during relaxation of existing sections. This map
3696 // a section id an input section list index. We assume that
3697 // Input_section_list is a vector.
3698 typedef Unordered_map
<Section_id
, size_t, Section_id_hash
> Relaxation_map
;
3700 // Add a new output section by Input_section.
3702 add_output_section_data(Input_section
*);
3704 // Add an SHF_MERGE input section. Returns true if the section was
3705 // handled. If KEEPS_INPUT_SECTIONS is true, the output merge section
3706 // stores information about the merged input sections.
3708 add_merge_input_section(Relobj
* object
, unsigned int shndx
, uint64_t flags
,
3709 uint64_t entsize
, uint64_t addralign
,
3710 bool keeps_input_sections
);
3712 // Add an output SHF_MERGE section POSD to this output section.
3713 // IS_STRING indicates whether it is a SHF_STRINGS section, and
3714 // ENTSIZE is the entity size. This returns the entry added to
3717 add_output_merge_section(Output_section_data
* posd
, bool is_string
,
3720 // Sort the attached input sections.
3722 sort_attached_input_sections();
3724 // Find the merge section into which an input section with index SHNDX in
3725 // OBJECT has been added. Return NULL if none found.
3726 Output_section_data
*
3727 find_merge_section(const Relobj
* object
, unsigned int shndx
) const;
3729 // Build a relaxation map.
3731 build_relaxation_map(
3732 const Input_section_list
& input_sections
,
3734 Relaxation_map
* map
) const;
3736 // Convert input sections in an input section list into relaxed sections.
3738 convert_input_sections_in_list_to_relaxed_sections(
3739 const std::vector
<Output_relaxed_input_section
*>& relaxed_sections
,
3740 const Relaxation_map
& map
,
3741 Input_section_list
* input_sections
);
3743 // Build the lookup maps for merge and relaxed input sections.
3745 build_lookup_maps() const;
3747 // Most of these fields are only valid after layout.
3749 // The name of the section. This will point into a Stringpool.
3751 // The section address is in the parent class.
3752 // The section alignment.
3753 uint64_t addralign_
;
3754 // The section entry size.
3756 // The load address. This is only used when using a linker script
3757 // with a SECTIONS clause. The has_load_address_ field indicates
3758 // whether this field is valid.
3759 uint64_t load_address_
;
3760 // The file offset is in the parent class.
3761 // Set the section link field to the index of this section.
3762 const Output_data
* link_section_
;
3763 // If link_section_ is NULL, this is the link field.
3765 // Set the section info field to the index of this section.
3766 const Output_section
* info_section_
;
3767 // If info_section_ is NULL, set the info field to the symbol table
3768 // index of this symbol.
3769 const Symbol
* info_symndx_
;
3770 // If info_section_ and info_symndx_ are NULL, this is the section
3773 // The section type.
3774 const elfcpp::Elf_Word type_
;
3775 // The section flags.
3776 elfcpp::Elf_Xword flags_
;
3777 // The order of this section in the output segment.
3778 Output_section_order order_
;
3779 // The section index.
3780 unsigned int out_shndx_
;
3781 // If there is a STT_SECTION for this output section in the normal
3782 // symbol table, this is the symbol index. This starts out as zero.
3783 // It is initialized in Layout::finalize() to be the index, or -1U
3784 // if there isn't one.
3785 unsigned int symtab_index_
;
3786 // If there is a STT_SECTION for this output section in the dynamic
3787 // symbol table, this is the symbol index. This starts out as zero.
3788 // It is initialized in Layout::finalize() to be the index, or -1U
3789 // if there isn't one.
3790 unsigned int dynsym_index_
;
3791 // The input sections. This will be empty in cases where we don't
3792 // need to keep track of them.
3793 Input_section_list input_sections_
;
3794 // The offset of the first entry in input_sections_.
3795 off_t first_input_offset_
;
3796 // The fill data. This is separate from input_sections_ because we
3797 // often will need fill sections without needing to keep track of
3800 // If the section requires postprocessing, this buffer holds the
3801 // section contents during relocation.
3802 unsigned char* postprocessing_buffer_
;
3803 // Whether this output section needs a STT_SECTION symbol in the
3804 // normal symbol table. This will be true if there is a relocation
3806 bool needs_symtab_index_
: 1;
3807 // Whether this output section needs a STT_SECTION symbol in the
3808 // dynamic symbol table. This will be true if there is a dynamic
3809 // relocation which needs it.
3810 bool needs_dynsym_index_
: 1;
3811 // Whether the link field of this output section should point to the
3812 // normal symbol table.
3813 bool should_link_to_symtab_
: 1;
3814 // Whether the link field of this output section should point to the
3815 // dynamic symbol table.
3816 bool should_link_to_dynsym_
: 1;
3817 // Whether this section should be written after all the input
3818 // sections are complete.
3819 bool after_input_sections_
: 1;
3820 // Whether this section requires post processing after all
3821 // relocations have been applied.
3822 bool requires_postprocessing_
: 1;
3823 // Whether an input section was mapped to this output section
3824 // because of a SECTIONS clause in a linker script.
3825 bool found_in_sections_clause_
: 1;
3826 // Whether this section has an explicitly specified load address.
3827 bool has_load_address_
: 1;
3828 // True if the info_section_ field means the section index of the
3829 // section, false if it means the symbol index of the corresponding
3831 bool info_uses_section_index_
: 1;
3832 // True if input sections attached to this output section have to be
3833 // sorted according to a specified order.
3834 bool input_section_order_specified_
: 1;
3835 // True if the input sections attached to this output section may
3837 bool may_sort_attached_input_sections_
: 1;
3838 // True if the input sections attached to this output section must
3840 bool must_sort_attached_input_sections_
: 1;
3841 // True if the input sections attached to this output section have
3842 // already been sorted.
3843 bool attached_input_sections_are_sorted_
: 1;
3844 // True if this section holds relro data.
3846 // True if this is a small section.
3847 bool is_small_section_
: 1;
3848 // True if this is a large section.
3849 bool is_large_section_
: 1;
3850 // Whether code-fills are generated at write.
3851 bool generate_code_fills_at_write_
: 1;
3852 // Whether the entry size field should be zero.
3853 bool is_entsize_zero_
: 1;
3854 // Whether section offsets need adjustment due to relaxation.
3855 bool section_offsets_need_adjustment_
: 1;
3856 // Whether this is a NOLOAD section.
3857 bool is_noload_
: 1;
3858 // Whether this always keeps input section.
3859 bool always_keeps_input_sections_
: 1;
3860 // Whether this section has a fixed layout, for incremental update links.
3861 bool has_fixed_layout_
: 1;
3862 // For SHT_TLS sections, the offset of this section relative to the base
3863 // of the TLS segment.
3864 uint64_t tls_offset_
;
3865 // Saved checkpoint.
3866 Checkpoint_output_section
* checkpoint_
;
3867 // Fast lookup maps for merged and relaxed input sections.
3868 Output_section_lookup_maps
* lookup_maps_
;
3869 // List of available regions within the section, for incremental
3871 Free_list free_list_
;
3874 // An output segment. PT_LOAD segments are built from collections of
3875 // output sections. Other segments typically point within PT_LOAD
3876 // segments, and are built directly as needed.
3878 // NOTE: We want to use the copy constructor for this class. During
3879 // relaxation, we may try built the segments multiple times. We do
3880 // that by copying the original segment list before lay-out, doing
3881 // a trial lay-out and roll-back to the saved copied if we need to
3882 // to the lay-out again.
3884 class Output_segment
3887 // Create an output segment, specifying the type and flags.
3888 Output_segment(elfcpp::Elf_Word
, elfcpp::Elf_Word
);
3890 // Return the virtual address.
3893 { return this->vaddr_
; }
3895 // Return the physical address.
3898 { return this->paddr_
; }
3900 // Return the segment type.
3903 { return this->type_
; }
3905 // Return the segment flags.
3908 { return this->flags_
; }
3910 // Return the memory size.
3913 { return this->memsz_
; }
3915 // Return the file size.
3918 { return this->filesz_
; }
3920 // Return the file offset.
3923 { return this->offset_
; }
3925 // Whether this is a segment created to hold large data sections.
3927 is_large_data_segment() const
3928 { return this->is_large_data_segment_
; }
3930 // Record that this is a segment created to hold large data
3933 set_is_large_data_segment()
3934 { this->is_large_data_segment_
= true; }
3936 // Return the maximum alignment of the Output_data.
3938 maximum_alignment();
3940 // Add the Output_section OS to this PT_LOAD segment. SEG_FLAGS is
3941 // the segment flags to use.
3943 add_output_section_to_load(Layout
* layout
, Output_section
* os
,
3944 elfcpp::Elf_Word seg_flags
);
3946 // Add the Output_section OS to this non-PT_LOAD segment. SEG_FLAGS
3947 // is the segment flags to use.
3949 add_output_section_to_nonload(Output_section
* os
,
3950 elfcpp::Elf_Word seg_flags
);
3952 // Remove an Output_section from this segment. It is an error if it
3955 remove_output_section(Output_section
* os
);
3957 // Add an Output_data (which need not be an Output_section) to the
3958 // start of this segment.
3960 add_initial_output_data(Output_data
*);
3962 // Return true if this segment has any sections which hold actual
3963 // data, rather than being a BSS section.
3965 has_any_data_sections() const;
3967 // Whether this segment has a dynamic relocs.
3969 has_dynamic_reloc() const;
3971 // Return the address of the first section.
3973 first_section_load_address() const;
3975 // Return whether the addresses have been set already.
3977 are_addresses_set() const
3978 { return this->are_addresses_set_
; }
3980 // Set the addresses.
3982 set_addresses(uint64_t vaddr
, uint64_t paddr
)
3984 this->vaddr_
= vaddr
;
3985 this->paddr_
= paddr
;
3986 this->are_addresses_set_
= true;
3989 // Update the flags for the flags of an output section added to this
3992 update_flags_for_output_section(elfcpp::Elf_Xword flags
)
3994 // The ELF ABI specifies that a PT_TLS segment should always have
3995 // PF_R as the flags.
3996 if (this->type() != elfcpp::PT_TLS
)
3997 this->flags_
|= flags
;
4000 // Set the segment flags. This is only used if we have a PHDRS
4001 // clause which explicitly specifies the flags.
4003 set_flags(elfcpp::Elf_Word flags
)
4004 { this->flags_
= flags
; }
4006 // Set the address of the segment to ADDR and the offset to *POFF
4007 // and set the addresses and offsets of all contained output
4008 // sections accordingly. Set the section indexes of all contained
4009 // output sections starting with *PSHNDX. If RESET is true, first
4010 // reset the addresses of the contained sections. Return the
4011 // address of the immediately following segment. Update *POFF and
4012 // *PSHNDX. This should only be called for a PT_LOAD segment.
4014 set_section_addresses(Layout
*, bool reset
, uint64_t addr
,
4015 unsigned int* increase_relro
, bool* has_relro
,
4016 off_t
* poff
, unsigned int* pshndx
);
4018 // Set the minimum alignment of this segment. This may be adjusted
4019 // upward based on the section alignments.
4021 set_minimum_p_align(uint64_t align
)
4023 if (align
> this->min_p_align_
)
4024 this->min_p_align_
= align
;
4027 // Set the offset of this segment based on the section. This should
4028 // only be called for a non-PT_LOAD segment.
4030 set_offset(unsigned int increase
);
4032 // Set the TLS offsets of the sections contained in the PT_TLS segment.
4036 // Return the number of output sections.
4038 output_section_count() const;
4040 // Return the section attached to the list segment with the lowest
4041 // load address. This is used when handling a PHDRS clause in a
4044 section_with_lowest_load_address() const;
4046 // Write the segment header into *OPHDR.
4047 template<int size
, bool big_endian
>
4049 write_header(elfcpp::Phdr_write
<size
, big_endian
>*);
4051 // Write the section headers of associated sections into V.
4052 template<int size
, bool big_endian
>
4054 write_section_headers(const Layout
*, const Stringpool
*, unsigned char* v
,
4055 unsigned int* pshndx
) const;
4057 // Print the output sections in the map file.
4059 print_sections_to_mapfile(Mapfile
*) const;
4062 typedef std::vector
<Output_data
*> Output_data_list
;
4064 // Find the maximum alignment in an Output_data_list.
4066 maximum_alignment_list(const Output_data_list
*);
4068 // Return whether the first data section is a relro section.
4070 is_first_section_relro() const;
4072 // Set the section addresses in an Output_data_list.
4074 set_section_list_addresses(Layout
*, bool reset
, Output_data_list
*,
4075 uint64_t addr
, off_t
* poff
, unsigned int* pshndx
,
4078 // Return the number of Output_sections in an Output_data_list.
4080 output_section_count_list(const Output_data_list
*) const;
4082 // Return whether an Output_data_list has a dynamic reloc.
4084 has_dynamic_reloc_list(const Output_data_list
*) const;
4086 // Find the section with the lowest load address in an
4087 // Output_data_list.
4089 lowest_load_address_in_list(const Output_data_list
* pdl
,
4090 Output_section
** found
,
4091 uint64_t* found_lma
) const;
4093 // Find the first and last entries by address.
4095 find_first_and_last_list(const Output_data_list
* pdl
,
4096 const Output_data
** pfirst
,
4097 const Output_data
** plast
) const;
4099 // Write the section headers in the list into V.
4100 template<int size
, bool big_endian
>
4102 write_section_headers_list(const Layout
*, const Stringpool
*,
4103 const Output_data_list
*, unsigned char* v
,
4104 unsigned int* pshdx
) const;
4106 // Print a section list to the mapfile.
4108 print_section_list_to_mapfile(Mapfile
*, const Output_data_list
*) const;
4110 // NOTE: We want to use the copy constructor. Currently, shallow copy
4111 // works for us so we do not need to write our own copy constructor.
4113 // The list of output data attached to this segment.
4114 Output_data_list output_lists_
[ORDER_MAX
];
4115 // The segment virtual address.
4117 // The segment physical address.
4119 // The size of the segment in memory.
4121 // The maximum section alignment. The is_max_align_known_ field
4122 // indicates whether this has been finalized.
4123 uint64_t max_align_
;
4124 // The required minimum value for the p_align field. This is used
4125 // for PT_LOAD segments. Note that this does not mean that
4126 // addresses should be aligned to this value; it means the p_paddr
4127 // and p_vaddr fields must be congruent modulo this value. For
4128 // non-PT_LOAD segments, the dynamic linker works more efficiently
4129 // if the p_align field has the more conventional value, although it
4130 // can align as needed.
4131 uint64_t min_p_align_
;
4132 // The offset of the segment data within the file.
4134 // The size of the segment data in the file.
4136 // The segment type;
4137 elfcpp::Elf_Word type_
;
4138 // The segment flags.
4139 elfcpp::Elf_Word flags_
;
4140 // Whether we have finalized max_align_.
4141 bool is_max_align_known_
: 1;
4142 // Whether vaddr and paddr were set by a linker script.
4143 bool are_addresses_set_
: 1;
4144 // Whether this segment holds large data sections.
4145 bool is_large_data_segment_
: 1;
4148 // This class represents the output file.
4153 Output_file(const char* name
);
4155 // Indicate that this is a temporary file which should not be
4159 { this->is_temporary_
= true; }
4161 // Try to open an existing file. Returns false if the file doesn't
4162 // exist, has a size of 0 or can't be mmaped. This method is
4165 open_for_modification();
4167 // Open the output file. FILE_SIZE is the final size of the file.
4168 // If the file already exists, it is deleted/truncated. This method
4169 // is thread-unsafe.
4171 open(off_t file_size
);
4173 // Resize the output file. This method is thread-unsafe.
4175 resize(off_t file_size
);
4177 // Close the output file (flushing all buffered data) and make sure
4178 // there are no errors. This method is thread-unsafe.
4182 // Return the size of this file.
4185 { return this->file_size_
; }
4187 // Return the name of this file.
4190 { return this->name_
; }
4192 // We currently always use mmap which makes the view handling quite
4193 // simple. In the future we may support other approaches.
4195 // Write data to the output file.
4197 write(off_t offset
, const void* data
, size_t len
)
4198 { memcpy(this->base_
+ offset
, data
, len
); }
4200 // Get a buffer to use to write to the file, given the offset into
4201 // the file and the size.
4203 get_output_view(off_t start
, size_t size
)
4205 gold_assert(start
>= 0
4206 && start
+ static_cast<off_t
>(size
) <= this->file_size_
);
4207 return this->base_
+ start
;
4210 // VIEW must have been returned by get_output_view. Write the
4211 // buffer to the file, passing in the offset and the size.
4213 write_output_view(off_t
, size_t, unsigned char*)
4216 // Get a read/write buffer. This is used when we want to write part
4217 // of the file, read it in, and write it again.
4219 get_input_output_view(off_t start
, size_t size
)
4220 { return this->get_output_view(start
, size
); }
4222 // Write a read/write buffer back to the file.
4224 write_input_output_view(off_t
, size_t, unsigned char*)
4227 // Get a read buffer. This is used when we just want to read part
4228 // of the file back it in.
4229 const unsigned char*
4230 get_input_view(off_t start
, size_t size
)
4231 { return this->get_output_view(start
, size
); }
4233 // Release a read bfufer.
4235 free_input_view(off_t
, size_t, const unsigned char*)
4239 // Map the file into memory or, if that fails, allocate anonymous
4244 // Allocate anonymous memory for the file.
4248 // Map the file into memory.
4252 // Unmap the file from memory (and flush to disk buffers).
4262 // Base of file mapped into memory.
4263 unsigned char* base_
;
4264 // True iff base_ points to a memory buffer rather than an output file.
4265 bool map_is_anonymous_
;
4266 // True if base_ was allocated using new rather than mmap.
4267 bool map_is_allocated_
;
4268 // True if this is a temporary file which should not be output.
4272 } // End namespace gold.
4274 #endif // !defined(GOLD_OUTPUT_H)