1 // output.h -- manage the output file for gold -*- C++ -*-
3 // Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
31 #include "reloc-types.h"
36 class General_options;
41 class Relocatable_relocs;
43 template<int size, bool big_endian>
45 template<int size, bool big_endian>
48 // An abtract class for data which has to go into the output file.
53 explicit Output_data()
54 : address_(0), data_size_(0), offset_(-1),
55 is_address_valid_(false), is_data_size_valid_(false),
56 is_offset_valid_(false),
57 dynamic_reloc_count_(0)
63 // Return the address. For allocated sections, this is only valid
64 // after Layout::finalize is finished.
68 gold_assert(this->is_address_valid_);
69 return this->address_;
72 // Return the size of the data. For allocated sections, this must
73 // be valid after Layout::finalize calls set_address, but need not
74 // be valid before then.
78 gold_assert(this->is_data_size_valid_);
79 return this->data_size_;
82 // Return the file offset. This is only valid after
83 // Layout::finalize is finished. For some non-allocated sections,
84 // it may not be valid until near the end of the link.
88 gold_assert(this->is_offset_valid_);
92 // Reset the address and file offset. This essentially disables the
93 // sanity testing about duplicate and unknown settings.
95 reset_address_and_file_offset()
97 this->is_address_valid_ = false;
98 this->is_offset_valid_ = false;
99 this->is_data_size_valid_ = false;
100 this->do_reset_address_and_file_offset();
103 // Return the required alignment.
106 { return this->do_addralign(); }
108 // Return whether this has a load address.
110 has_load_address() const
111 { return this->do_has_load_address(); }
113 // Return the load address.
116 { return this->do_load_address(); }
118 // Return whether this is an Output_section.
121 { return this->do_is_section(); }
123 // Return whether this is an Output_section of the specified type.
125 is_section_type(elfcpp::Elf_Word stt) const
126 { return this->do_is_section_type(stt); }
128 // Return whether this is an Output_section with the specified flag
131 is_section_flag_set(elfcpp::Elf_Xword shf) const
132 { return this->do_is_section_flag_set(shf); }
134 // Return the output section that this goes in, if there is one.
137 { return this->do_output_section(); }
139 // Return the output section index, if there is an output section.
142 { return this->do_out_shndx(); }
144 // Set the output section index, if this is an output section.
146 set_out_shndx(unsigned int shndx)
147 { this->do_set_out_shndx(shndx); }
149 // Set the address and file offset of this data, and finalize the
150 // size of the data. This is called during Layout::finalize for
151 // allocated sections.
153 set_address_and_file_offset(uint64_t addr, off_t off)
155 this->set_address(addr);
156 this->set_file_offset(off);
157 this->finalize_data_size();
162 set_address(uint64_t addr)
164 gold_assert(!this->is_address_valid_);
165 this->address_ = addr;
166 this->is_address_valid_ = true;
169 // Set the file offset.
171 set_file_offset(off_t off)
173 gold_assert(!this->is_offset_valid_);
175 this->is_offset_valid_ = true;
178 // Finalize the data size.
182 if (!this->is_data_size_valid_)
184 // Tell the child class to set the data size.
185 this->set_final_data_size();
186 gold_assert(this->is_data_size_valid_);
190 // Set the TLS offset. Called only for SHT_TLS sections.
192 set_tls_offset(uint64_t tls_base)
193 { this->do_set_tls_offset(tls_base); }
195 // Return the TLS offset, relative to the base of the TLS segment.
196 // Valid only for SHT_TLS sections.
199 { return this->do_tls_offset(); }
201 // Write the data to the output file. This is called after
202 // Layout::finalize is complete.
204 write(Output_file* file)
205 { this->do_write(file); }
207 // This is called by Layout::finalize to note that the sizes of
208 // allocated sections must now be fixed.
211 { Output_data::allocated_sizes_are_fixed = true; }
213 // Used to check that layout has been done.
216 { return Output_data::allocated_sizes_are_fixed; }
218 // Count the number of dynamic relocations applied to this section.
221 { ++this->dynamic_reloc_count_; }
223 // Return the number of dynamic relocations applied to this section.
225 dynamic_reloc_count() const
226 { return this->dynamic_reloc_count_; }
228 // Whether the address is valid.
230 is_address_valid() const
231 { return this->is_address_valid_; }
233 // Whether the file offset is valid.
235 is_offset_valid() const
236 { return this->is_offset_valid_; }
238 // Whether the data size is valid.
240 is_data_size_valid() const
241 { return this->is_data_size_valid_; }
244 // Functions that child classes may or in some cases must implement.
246 // Write the data to the output file.
248 do_write(Output_file*) = 0;
250 // Return the required alignment.
252 do_addralign() const = 0;
254 // Return whether this has a load address.
256 do_has_load_address() const
259 // Return the load address.
261 do_load_address() const
262 { gold_unreachable(); }
264 // Return whether this is an Output_section.
266 do_is_section() const
269 // Return whether this is an Output_section of the specified type.
270 // This only needs to be implement by Output_section.
272 do_is_section_type(elfcpp::Elf_Word) const
275 // Return whether this is an Output_section with the specific flag
276 // set. This only needs to be implemented by Output_section.
278 do_is_section_flag_set(elfcpp::Elf_Xword) const
281 // Return the output section, if there is one.
282 virtual Output_section*
286 // Return the output section index, if there is an output section.
289 { gold_unreachable(); }
291 // Set the output section index, if this is an output section.
293 do_set_out_shndx(unsigned int)
294 { gold_unreachable(); }
296 // This is a hook for derived classes to set the data size. This is
297 // called by finalize_data_size, normally called during
298 // Layout::finalize, when the section address is set.
300 set_final_data_size()
301 { gold_unreachable(); }
303 // A hook for resetting the address and file offset.
305 do_reset_address_and_file_offset()
308 // Set the TLS offset. Called only for SHT_TLS sections.
310 do_set_tls_offset(uint64_t)
311 { gold_unreachable(); }
313 // Return the TLS offset, relative to the base of the TLS segment.
314 // Valid only for SHT_TLS sections.
316 do_tls_offset() const
317 { gold_unreachable(); }
319 // Functions that child classes may call.
321 // Set the size of the data.
323 set_data_size(off_t data_size)
325 gold_assert(!this->is_data_size_valid_);
326 this->data_size_ = data_size;
327 this->is_data_size_valid_ = true;
330 // Get the current data size--this is for the convenience of
331 // sections which build up their size over time.
333 current_data_size_for_child() const
334 { return this->data_size_; }
336 // Set the current data size--this is for the convenience of
337 // sections which build up their size over time.
339 set_current_data_size_for_child(off_t data_size)
341 gold_assert(!this->is_data_size_valid_);
342 this->data_size_ = data_size;
345 // Return default alignment for the target size.
349 // Return default alignment for a specified size--32 or 64.
351 default_alignment_for_size(int size);
354 Output_data(const Output_data&);
355 Output_data& operator=(const Output_data&);
357 // This is used for verification, to make sure that we don't try to
358 // change any sizes of allocated sections after we set the section
360 static bool allocated_sizes_are_fixed;
362 // Memory address in output file.
364 // Size of data in output file.
366 // File offset of contents in output file.
368 // Whether address_ is valid.
369 bool is_address_valid_;
370 // Whether data_size_ is valid.
371 bool is_data_size_valid_;
372 // Whether offset_ is valid.
373 bool is_offset_valid_;
374 // Count of dynamic relocations applied to this section.
375 unsigned int dynamic_reloc_count_;
378 // Output the section headers.
380 class Output_section_headers : public Output_data
383 Output_section_headers(const Layout*,
384 const Layout::Segment_list*,
385 const Layout::Section_list*,
386 const Layout::Section_list*,
390 // Write the data to the file.
392 do_write(Output_file*);
394 // Return the required alignment.
397 { return Output_data::default_alignment(); }
400 // Write the data to the file with the right size and endianness.
401 template<int size, bool big_endian>
403 do_sized_write(Output_file*);
405 const Layout* layout_;
406 const Layout::Segment_list* segment_list_;
407 const Layout::Section_list* section_list_;
408 const Layout::Section_list* unattached_section_list_;
409 const Stringpool* secnamepool_;
412 // Output the segment headers.
414 class Output_segment_headers : public Output_data
417 Output_segment_headers(const Layout::Segment_list& segment_list);
420 // Write the data to the file.
422 do_write(Output_file*);
424 // Return the required alignment.
427 { return Output_data::default_alignment(); }
430 // Write the data to the file with the right size and endianness.
431 template<int size, bool big_endian>
433 do_sized_write(Output_file*);
435 const Layout::Segment_list& segment_list_;
438 // Output the ELF file header.
440 class Output_file_header : public Output_data
443 Output_file_header(const Target*,
445 const Output_segment_headers*,
448 // Add information about the section headers. We lay out the ELF
449 // file header before we create the section headers.
450 void set_section_info(const Output_section_headers*,
451 const Output_section* shstrtab);
454 // Write the data to the file.
456 do_write(Output_file*);
458 // Return the required alignment.
461 { return Output_data::default_alignment(); }
464 // Write the data to the file with the right size and endianness.
465 template<int size, bool big_endian>
467 do_sized_write(Output_file*);
469 // Return the value to use for the entry address.
471 typename elfcpp::Elf_types<size>::Elf_Addr
474 const Target* target_;
475 const Symbol_table* symtab_;
476 const Output_segment_headers* segment_header_;
477 const Output_section_headers* section_header_;
478 const Output_section* shstrtab_;
482 // Output sections are mainly comprised of input sections. However,
483 // there are cases where we have data to write out which is not in an
484 // input section. Output_section_data is used in such cases. This is
485 // an abstract base class.
487 class Output_section_data : public Output_data
490 Output_section_data(off_t data_size, uint64_t addralign)
491 : Output_data(), output_section_(NULL), addralign_(addralign)
492 { this->set_data_size(data_size); }
494 Output_section_data(uint64_t addralign)
495 : Output_data(), output_section_(NULL), addralign_(addralign)
498 // Return the output section.
499 const Output_section*
500 output_section() const
501 { return this->output_section_; }
503 // Record the output section.
505 set_output_section(Output_section* os);
507 // Add an input section, for SHF_MERGE sections. This returns true
508 // if the section was handled.
510 add_input_section(Relobj* object, unsigned int shndx)
511 { return this->do_add_input_section(object, shndx); }
513 // Given an input OBJECT, an input section index SHNDX within that
514 // object, and an OFFSET relative to the start of that input
515 // section, return whether or not the corresponding offset within
516 // the output section is known. If this function returns true, it
517 // sets *POUTPUT to the output offset. The value -1 indicates that
518 // this input offset is being discarded.
520 output_offset(const Relobj* object, unsigned int shndx,
521 section_offset_type offset,
522 section_offset_type *poutput) const
523 { return this->do_output_offset(object, shndx, offset, poutput); }
525 // Return whether this is the merge section for the input section
526 // SHNDX in OBJECT. This should return true when output_offset
527 // would return true for some values of OFFSET.
529 is_merge_section_for(const Relobj* object, unsigned int shndx) const
530 { return this->do_is_merge_section_for(object, shndx); }
532 // Write the contents to a buffer. This is used for sections which
533 // require postprocessing, such as compression.
535 write_to_buffer(unsigned char* buffer)
536 { this->do_write_to_buffer(buffer); }
538 // Print merge stats to stderr. This should only be called for
539 // SHF_MERGE sections.
541 print_merge_stats(const char* section_name)
542 { this->do_print_merge_stats(section_name); }
545 // The child class must implement do_write.
547 // The child class may implement specific adjustments to the output
550 do_adjust_output_section(Output_section*)
553 // May be implemented by child class. Return true if the section
556 do_add_input_section(Relobj*, unsigned int)
557 { gold_unreachable(); }
559 // The child class may implement output_offset.
561 do_output_offset(const Relobj*, unsigned int, section_offset_type,
562 section_offset_type*) const
565 // The child class may implement is_merge_section_for.
567 do_is_merge_section_for(const Relobj*, unsigned int) const
570 // The child class may implement write_to_buffer. Most child
571 // classes can not appear in a compressed section, and they do not
574 do_write_to_buffer(unsigned char*)
575 { gold_unreachable(); }
577 // Print merge statistics.
579 do_print_merge_stats(const char*)
580 { gold_unreachable(); }
582 // Return the required alignment.
585 { return this->addralign_; }
587 // Return the output section.
590 { return this->output_section_; }
592 // Return the section index of the output section.
594 do_out_shndx() const;
596 // Set the alignment.
598 set_addralign(uint64_t addralign)
599 { this->addralign_ = addralign; }
602 // The output section for this section.
603 Output_section* output_section_;
604 // The required alignment.
608 // Some Output_section_data classes build up their data step by step,
609 // rather than all at once. This class provides an interface for
612 class Output_section_data_build : public Output_section_data
615 Output_section_data_build(uint64_t addralign)
616 : Output_section_data(addralign)
619 // Get the current data size.
621 current_data_size() const
622 { return this->current_data_size_for_child(); }
624 // Set the current data size.
626 set_current_data_size(off_t data_size)
627 { this->set_current_data_size_for_child(data_size); }
630 // Set the final data size.
632 set_final_data_size()
633 { this->set_data_size(this->current_data_size_for_child()); }
636 // A simple case of Output_data in which we have constant data to
639 class Output_data_const : public Output_section_data
642 Output_data_const(const std::string& data, uint64_t addralign)
643 : Output_section_data(data.size(), addralign), data_(data)
646 Output_data_const(const char* p, off_t len, uint64_t addralign)
647 : Output_section_data(len, addralign), data_(p, len)
650 Output_data_const(const unsigned char* p, off_t len, uint64_t addralign)
651 : Output_section_data(len, addralign),
652 data_(reinterpret_cast<const char*>(p), len)
656 // Write the data to the output file.
658 do_write(Output_file*);
660 // Write the data to a buffer.
662 do_write_to_buffer(unsigned char* buffer)
663 { memcpy(buffer, this->data_.data(), this->data_.size()); }
669 // Another version of Output_data with constant data, in which the
670 // buffer is allocated by the caller.
672 class Output_data_const_buffer : public Output_section_data
675 Output_data_const_buffer(const unsigned char* p, off_t len,
677 : Output_section_data(len, addralign), p_(p)
681 // Write the data the output file.
683 do_write(Output_file*);
685 // Write the data to a buffer.
687 do_write_to_buffer(unsigned char* buffer)
688 { memcpy(buffer, this->p_, this->data_size()); }
691 const unsigned char* p_;
694 // A place holder for a fixed amount of data written out via some
697 class Output_data_fixed_space : public Output_section_data
700 Output_data_fixed_space(off_t data_size, uint64_t addralign)
701 : Output_section_data(data_size, addralign)
705 // Write out the data--the actual data must be written out
708 do_write(Output_file*)
712 // A place holder for variable sized data written out via some other
715 class Output_data_space : public Output_section_data_build
718 explicit Output_data_space(uint64_t addralign)
719 : Output_section_data_build(addralign)
722 // Set the alignment.
724 set_space_alignment(uint64_t align)
725 { this->set_addralign(align); }
728 // Write out the data--the actual data must be written out
731 do_write(Output_file*)
735 // A string table which goes into an output section.
737 class Output_data_strtab : public Output_section_data
740 Output_data_strtab(Stringpool* strtab)
741 : Output_section_data(1), strtab_(strtab)
745 // This is called to set the address and file offset. Here we make
746 // sure that the Stringpool is finalized.
748 set_final_data_size();
750 // Write out the data.
752 do_write(Output_file*);
754 // Write the data to a buffer.
756 do_write_to_buffer(unsigned char* buffer)
757 { this->strtab_->write_to_buffer(buffer, this->data_size()); }
763 // This POD class is used to represent a single reloc in the output
764 // file. This could be a private class within Output_data_reloc, but
765 // the templatization is complex enough that I broke it out into a
766 // separate class. The class is templatized on either elfcpp::SHT_REL
767 // or elfcpp::SHT_RELA, and also on whether this is a dynamic
768 // relocation or an ordinary relocation.
770 // A relocation can be against a global symbol, a local symbol, a
771 // local section symbol, an output section, or the undefined symbol at
772 // index 0. We represent the latter by using a NULL global symbol.
774 template<int sh_type, bool dynamic, int size, bool big_endian>
777 template<bool dynamic, int size, bool big_endian>
778 class Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>
781 typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
782 typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend;
784 // An uninitialized entry. We need this because we want to put
785 // instances of this class into an STL container.
787 : local_sym_index_(INVALID_CODE)
790 // We have a bunch of different constructors. They come in pairs
791 // depending on how the address of the relocation is specified. It
792 // can either be an offset in an Output_data or an offset in an
795 // A reloc against a global symbol.
797 Output_reloc(Symbol* gsym, unsigned int type, Output_data* od,
798 Address address, bool is_relative);
800 Output_reloc(Symbol* gsym, unsigned int type, Relobj* relobj,
801 unsigned int shndx, Address address, bool is_relative);
803 // A reloc against a local symbol or local section symbol.
805 Output_reloc(Sized_relobj<size, big_endian>* relobj,
806 unsigned int local_sym_index, unsigned int type,
807 Output_data* od, Address address, bool is_relative,
808 bool is_section_symbol);
810 Output_reloc(Sized_relobj<size, big_endian>* relobj,
811 unsigned int local_sym_index, unsigned int type,
812 unsigned int shndx, Address address, bool is_relative,
813 bool is_section_symbol);
815 // A reloc against the STT_SECTION symbol of an output section.
817 Output_reloc(Output_section* os, unsigned int type, Output_data* od,
820 Output_reloc(Output_section* os, unsigned int type, Relobj* relobj,
821 unsigned int shndx, Address address);
823 // Return TRUE if this is a RELATIVE relocation.
826 { return this->is_relative_; }
828 // Return whether this is against a local section symbol.
830 is_local_section_symbol() const
832 return (this->local_sym_index_ != GSYM_CODE
833 && this->local_sym_index_ != SECTION_CODE
834 && this->local_sym_index_ != INVALID_CODE
835 && this->is_section_symbol_);
838 // For a local section symbol, return the offset of the input
839 // section within the output section. ADDEND is the addend being
840 // applied to the input section.
842 local_section_offset(Addend addend) const;
844 // Get the value of the symbol referred to by a Rel relocation when
845 // we are adding the given ADDEND.
847 symbol_value(Addend addend) const;
849 // Write the reloc entry to an output view.
851 write(unsigned char* pov) const;
853 // Write the offset and info fields to Write_rel.
854 template<typename Write_rel>
855 void write_rel(Write_rel*) const;
858 // Record that we need a dynamic symbol index.
860 set_needs_dynsym_index();
862 // Return the symbol index.
864 get_symbol_index() const;
866 // Codes for local_sym_index_.
873 // Invalid uninitialized entry.
879 // For a local symbol or local section symbol
880 // (this->local_sym_index_ >= 0), the object. We will never
881 // generate a relocation against a local symbol in a dynamic
882 // object; that doesn't make sense. And our callers will always
883 // be templatized, so we use Sized_relobj here.
884 Sized_relobj<size, big_endian>* relobj;
885 // For a global symbol (this->local_sym_index_ == GSYM_CODE, the
886 // symbol. If this is NULL, it indicates a relocation against the
887 // undefined 0 symbol.
889 // For a relocation against an output section
890 // (this->local_sym_index_ == SECTION_CODE), the output section.
895 // If this->shndx_ is not INVALID CODE, the object which holds the
896 // input section being used to specify the reloc address.
898 // If this->shndx_ is INVALID_CODE, the output data being used to
899 // specify the reloc address. This may be NULL if the reloc
900 // address is absolute.
903 // The address offset within the input section or the Output_data.
905 // This is GSYM_CODE for a global symbol, or SECTION_CODE for a
906 // relocation against an output section, or INVALID_CODE for an
907 // uninitialized value. Otherwise, for a local symbol
908 // (this->is_section_symbol_ is false), the local symbol index. For
909 // a local section symbol (this->is_section_symbol_ is true), the
910 // section index in the input file.
911 unsigned int local_sym_index_;
912 // The reloc type--a processor specific code.
913 unsigned int type_ : 30;
914 // True if the relocation is a RELATIVE relocation.
915 bool is_relative_ : 1;
916 // True if the relocation is against a section symbol.
917 bool is_section_symbol_ : 1;
918 // If the reloc address is an input section in an object, the
919 // section index. This is INVALID_CODE if the reloc address is
920 // specified in some other way.
924 // The SHT_RELA version of Output_reloc<>. This is just derived from
925 // the SHT_REL version of Output_reloc, but it adds an addend.
927 template<bool dynamic, int size, bool big_endian>
928 class Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>
931 typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
932 typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend;
934 // An uninitialized entry.
939 // A reloc against a global symbol.
941 Output_reloc(Symbol* gsym, unsigned int type, Output_data* od,
942 Address address, Addend addend, bool is_relative)
943 : rel_(gsym, type, od, address, is_relative), addend_(addend)
946 Output_reloc(Symbol* gsym, unsigned int type, Relobj* relobj,
947 unsigned int shndx, Address address, Addend addend,
949 : rel_(gsym, type, relobj, shndx, address, is_relative), addend_(addend)
952 // A reloc against a local symbol.
954 Output_reloc(Sized_relobj<size, big_endian>* relobj,
955 unsigned int local_sym_index, unsigned int type,
956 Output_data* od, Address address,
957 Addend addend, bool is_relative, bool is_section_symbol)
958 : rel_(relobj, local_sym_index, type, od, address, is_relative,
963 Output_reloc(Sized_relobj<size, big_endian>* relobj,
964 unsigned int local_sym_index, unsigned int type,
965 unsigned int shndx, Address address,
966 Addend addend, bool is_relative, bool is_section_symbol)
967 : rel_(relobj, local_sym_index, type, shndx, address, is_relative,
972 // A reloc against the STT_SECTION symbol of an output section.
974 Output_reloc(Output_section* os, unsigned int type, Output_data* od,
975 Address address, Addend addend)
976 : rel_(os, type, od, address), addend_(addend)
979 Output_reloc(Output_section* os, unsigned int type, Relobj* relobj,
980 unsigned int shndx, Address address, Addend addend)
981 : rel_(os, type, relobj, shndx, address), addend_(addend)
984 // Write the reloc entry to an output view.
986 write(unsigned char* pov) const;
990 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian> rel_;
995 // Output_data_reloc is used to manage a section containing relocs.
996 // SH_TYPE is either elfcpp::SHT_REL or elfcpp::SHT_RELA. DYNAMIC
997 // indicates whether this is a dynamic relocation or a normal
998 // relocation. Output_data_reloc_base is a base class.
999 // Output_data_reloc is the real class, which we specialize based on
1002 template<int sh_type, bool dynamic, int size, bool big_endian>
1003 class Output_data_reloc_base : public Output_section_data_build
1006 typedef Output_reloc<sh_type, dynamic, size, big_endian> Output_reloc_type;
1007 typedef typename Output_reloc_type::Address Address;
1008 static const int reloc_size =
1009 Reloc_types<sh_type, size, big_endian>::reloc_size;
1011 // Construct the section.
1012 Output_data_reloc_base()
1013 : Output_section_data_build(Output_data::default_alignment_for_size(size))
1017 // Write out the data.
1019 do_write(Output_file*);
1021 // Set the entry size and the link.
1023 do_adjust_output_section(Output_section *os);
1025 // Add a relocation entry.
1027 add(Output_data *od, const Output_reloc_type& reloc)
1029 this->relocs_.push_back(reloc);
1030 this->set_current_data_size(this->relocs_.size() * reloc_size);
1031 od->add_dynamic_reloc();
1035 typedef std::vector<Output_reloc_type> Relocs;
1040 // The class which callers actually create.
1042 template<int sh_type, bool dynamic, int size, bool big_endian>
1043 class Output_data_reloc;
1045 // The SHT_REL version of Output_data_reloc.
1047 template<bool dynamic, int size, bool big_endian>
1048 class Output_data_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>
1049 : public Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian>
1052 typedef Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size,
1056 typedef typename Base::Output_reloc_type Output_reloc_type;
1057 typedef typename Output_reloc_type::Address Address;
1060 : Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian>()
1063 // Add a reloc against a global symbol.
1066 add_global(Symbol* gsym, unsigned int type, Output_data* od, Address address)
1067 { this->add(od, Output_reloc_type(gsym, type, od, address, false)); }
1070 add_global(Symbol* gsym, unsigned int type, Output_data* od, Relobj* relobj,
1071 unsigned int shndx, Address address)
1072 { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
1075 // Add a RELATIVE reloc against a global symbol. The final relocation
1076 // will not reference the symbol.
1079 add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
1081 { this->add(od, Output_reloc_type(gsym, type, od, address, true)); }
1084 add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
1085 Relobj* relobj, unsigned int shndx, Address address)
1087 this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
1091 // Add a reloc against a local symbol.
1094 add_local(Sized_relobj<size, big_endian>* relobj,
1095 unsigned int local_sym_index, unsigned int type,
1096 Output_data* od, Address address)
1098 this->add(od, Output_reloc_type(relobj, local_sym_index, type, od,
1099 address, false, false));
1103 add_local(Sized_relobj<size, big_endian>* relobj,
1104 unsigned int local_sym_index, unsigned int type,
1105 Output_data* od, unsigned int shndx, Address address)
1107 this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
1108 address, false, false));
1111 // Add a RELATIVE reloc against a local symbol.
1114 add_local_relative(Sized_relobj<size, big_endian>* relobj,
1115 unsigned int local_sym_index, unsigned int type,
1116 Output_data* od, Address address)
1118 this->add(od, Output_reloc_type(relobj, local_sym_index, type, od,
1119 address, true, false));
1123 add_local_relative(Sized_relobj<size, big_endian>* relobj,
1124 unsigned int local_sym_index, unsigned int type,
1125 Output_data* od, unsigned int shndx, Address address)
1127 this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
1128 address, true, false));
1131 // Add a reloc against a local section symbol. This will be
1132 // converted into a reloc against the STT_SECTION symbol of the
1136 add_local_section(Sized_relobj<size, big_endian>* relobj,
1137 unsigned int input_shndx, unsigned int type,
1138 Output_data* od, Address address)
1140 this->add(od, Output_reloc_type(relobj, input_shndx, type, od,
1141 address, false, true));
1145 add_local_section(Sized_relobj<size, big_endian>* relobj,
1146 unsigned int input_shndx, unsigned int type,
1147 Output_data* od, unsigned int shndx, Address address)
1149 this->add(od, Output_reloc_type(relobj, input_shndx, type, shndx,
1150 address, false, true));
1153 // A reloc against the STT_SECTION symbol of an output section.
1154 // OS is the Output_section that the relocation refers to; OD is
1155 // the Output_data object being relocated.
1158 add_output_section(Output_section* os, unsigned int type,
1159 Output_data* od, Address address)
1160 { this->add(od, Output_reloc_type(os, type, od, address)); }
1163 add_output_section(Output_section* os, unsigned int type, Output_data* od,
1164 Relobj* relobj, unsigned int shndx, Address address)
1165 { this->add(od, Output_reloc_type(os, type, relobj, shndx, address)); }
1168 // The SHT_RELA version of Output_data_reloc.
1170 template<bool dynamic, int size, bool big_endian>
1171 class Output_data_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>
1172 : public Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian>
1175 typedef Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size,
1179 typedef typename Base::Output_reloc_type Output_reloc_type;
1180 typedef typename Output_reloc_type::Address Address;
1181 typedef typename Output_reloc_type::Addend Addend;
1184 : Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian>()
1187 // Add a reloc against a global symbol.
1190 add_global(Symbol* gsym, unsigned int type, Output_data* od,
1191 Address address, Addend addend)
1192 { this->add(od, Output_reloc_type(gsym, type, od, address, addend,
1196 add_global(Symbol* gsym, unsigned int type, Output_data* od, Relobj* relobj,
1197 unsigned int shndx, Address address,
1199 { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
1202 // Add a RELATIVE reloc against a global symbol. The final output
1203 // relocation will not reference the symbol, but we must keep the symbol
1204 // information long enough to set the addend of the relocation correctly
1205 // when it is written.
1208 add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
1209 Address address, Addend addend)
1210 { this->add(od, Output_reloc_type(gsym, type, od, address, addend, true)); }
1213 add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
1214 Relobj* relobj, unsigned int shndx, Address address,
1216 { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
1219 // Add a reloc against a local symbol.
1222 add_local(Sized_relobj<size, big_endian>* relobj,
1223 unsigned int local_sym_index, unsigned int type,
1224 Output_data* od, Address address, Addend addend)
1226 this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address,
1227 addend, false, false));
1231 add_local(Sized_relobj<size, big_endian>* relobj,
1232 unsigned int local_sym_index, unsigned int type,
1233 Output_data* od, unsigned int shndx, Address address,
1236 this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
1237 address, addend, false, false));
1240 // Add a RELATIVE reloc against a local symbol.
1243 add_local_relative(Sized_relobj<size, big_endian>* relobj,
1244 unsigned int local_sym_index, unsigned int type,
1245 Output_data* od, Address address, Addend addend)
1247 this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address,
1248 addend, true, false));
1252 add_local_relative(Sized_relobj<size, big_endian>* relobj,
1253 unsigned int local_sym_index, unsigned int type,
1254 Output_data* od, unsigned int shndx, Address address,
1257 this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
1258 address, addend, true, false));
1261 // Add a reloc against a local section symbol. This will be
1262 // converted into a reloc against the STT_SECTION symbol of the
1266 add_local_section(Sized_relobj<size, big_endian>* relobj,
1267 unsigned int input_shndx, unsigned int type,
1268 Output_data* od, Address address, Addend addend)
1270 this->add(od, Output_reloc_type(relobj, input_shndx, type, od, address,
1271 addend, false, true));
1275 add_local_section(Sized_relobj<size, big_endian>* relobj,
1276 unsigned int input_shndx, unsigned int type,
1277 Output_data* od, unsigned int shndx, Address address,
1280 this->add(od, Output_reloc_type(relobj, input_shndx, type, shndx,
1281 address, addend, false, true));
1284 // A reloc against the STT_SECTION symbol of an output section.
1287 add_output_section(Output_section* os, unsigned int type, Output_data* od,
1288 Address address, Addend addend)
1289 { this->add(os, Output_reloc_type(os, type, od, address, addend)); }
1292 add_output_section(Output_section* os, unsigned int type, Relobj* relobj,
1293 unsigned int shndx, Address address, Addend addend)
1294 { this->add(os, Output_reloc_type(os, type, relobj, shndx, address,
1298 // Output_relocatable_relocs represents a relocation section in a
1299 // relocatable link. The actual data is written out in the target
1300 // hook relocate_for_relocatable. This just saves space for it.
1302 template<int sh_type, int size, bool big_endian>
1303 class Output_relocatable_relocs : public Output_section_data
1306 Output_relocatable_relocs(Relocatable_relocs* rr)
1307 : Output_section_data(Output_data::default_alignment_for_size(size)),
1312 set_final_data_size();
1314 // Write out the data. There is nothing to do here.
1316 do_write(Output_file*)
1320 // The relocs associated with this input section.
1321 Relocatable_relocs* rr_;
1324 // Handle a GROUP section.
1326 template<int size, bool big_endian>
1327 class Output_data_group : public Output_section_data
1330 Output_data_group(Sized_relobj<size, big_endian>* relobj,
1331 section_size_type entry_count,
1332 const elfcpp::Elf_Word* contents);
1335 do_write(Output_file*);
1338 // The input object.
1339 Sized_relobj<size, big_endian>* relobj_;
1340 // The group flag word.
1341 elfcpp::Elf_Word flags_;
1342 // The section indexes of the input sections in this group.
1343 std::vector<unsigned int> input_sections_;
1346 // Output_data_got is used to manage a GOT. Each entry in the GOT is
1347 // for one symbol--either a global symbol or a local symbol in an
1348 // object. The target specific code adds entries to the GOT as
1351 template<int size, bool big_endian>
1352 class Output_data_got : public Output_section_data_build
1355 typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype;
1356 typedef Output_data_reloc<elfcpp::SHT_REL, true, size, big_endian> Rel_dyn;
1357 typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Rela_dyn;
1360 : Output_section_data_build(Output_data::default_alignment_for_size(size)),
1364 // Add an entry for a global symbol to the GOT. Return true if this
1365 // is a new GOT entry, false if the symbol was already in the GOT.
1367 add_global(Symbol* gsym, unsigned int got_type);
1369 // Add an entry for a global symbol to the GOT, and add a dynamic
1370 // relocation of type R_TYPE for the GOT entry.
1372 add_global_with_rel(Symbol* gsym, unsigned int got_type,
1373 Rel_dyn* rel_dyn, unsigned int r_type);
1376 add_global_with_rela(Symbol* gsym, unsigned int got_type,
1377 Rela_dyn* rela_dyn, unsigned int r_type);
1379 // Add a pair of entries for a global symbol to the GOT, and add
1380 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
1382 add_global_pair_with_rel(Symbol* gsym, unsigned int got_type,
1383 Rel_dyn* rel_dyn, unsigned int r_type_1,
1384 unsigned int r_type_2);
1387 add_global_pair_with_rela(Symbol* gsym, unsigned int got_type,
1388 Rela_dyn* rela_dyn, unsigned int r_type_1,
1389 unsigned int r_type_2);
1391 // Add an entry for a local symbol to the GOT. This returns true if
1392 // this is a new GOT entry, false if the symbol already has a GOT
1395 add_local(Sized_relobj<size, big_endian>* object, unsigned int sym_index,
1396 unsigned int got_type);
1398 // Add an entry for a local symbol to the GOT, and add a dynamic
1399 // relocation of type R_TYPE for the GOT entry.
1401 add_local_with_rel(Sized_relobj<size, big_endian>* object,
1402 unsigned int sym_index, unsigned int got_type,
1403 Rel_dyn* rel_dyn, unsigned int r_type);
1406 add_local_with_rela(Sized_relobj<size, big_endian>* object,
1407 unsigned int sym_index, unsigned int got_type,
1408 Rela_dyn* rela_dyn, unsigned int r_type);
1410 // Add a pair of entries for a local symbol to the GOT, and add
1411 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
1413 add_local_pair_with_rel(Sized_relobj<size, big_endian>* object,
1414 unsigned int sym_index, unsigned int shndx,
1415 unsigned int got_type, Rel_dyn* rel_dyn,
1416 unsigned int r_type_1, unsigned int r_type_2);
1419 add_local_pair_with_rela(Sized_relobj<size, big_endian>* object,
1420 unsigned int sym_index, unsigned int shndx,
1421 unsigned int got_type, Rela_dyn* rela_dyn,
1422 unsigned int r_type_1, unsigned int r_type_2);
1424 // Add a constant to the GOT. This returns the offset of the new
1425 // entry from the start of the GOT.
1427 add_constant(Valtype constant)
1429 this->entries_.push_back(Got_entry(constant));
1430 this->set_got_size();
1431 return this->last_got_offset();
1435 // Write out the GOT table.
1437 do_write(Output_file*);
1440 // This POD class holds a single GOT entry.
1444 // Create a zero entry.
1446 : local_sym_index_(CONSTANT_CODE)
1447 { this->u_.constant = 0; }
1449 // Create a global symbol entry.
1450 explicit Got_entry(Symbol* gsym)
1451 : local_sym_index_(GSYM_CODE)
1452 { this->u_.gsym = gsym; }
1454 // Create a local symbol entry.
1455 Got_entry(Sized_relobj<size, big_endian>* object,
1456 unsigned int local_sym_index)
1457 : local_sym_index_(local_sym_index)
1459 gold_assert(local_sym_index != GSYM_CODE
1460 && local_sym_index != CONSTANT_CODE);
1461 this->u_.object = object;
1464 // Create a constant entry. The constant is a host value--it will
1465 // be swapped, if necessary, when it is written out.
1466 explicit Got_entry(Valtype constant)
1467 : local_sym_index_(CONSTANT_CODE)
1468 { this->u_.constant = constant; }
1470 // Write the GOT entry to an output view.
1472 write(unsigned char* pov) const;
1483 // For a local symbol, the object.
1484 Sized_relobj<size, big_endian>* object;
1485 // For a global symbol, the symbol.
1487 // For a constant, the constant.
1490 // For a local symbol, the local symbol index. This is GSYM_CODE
1491 // for a global symbol, or CONSTANT_CODE for a constant.
1492 unsigned int local_sym_index_;
1495 typedef std::vector<Got_entry> Got_entries;
1497 // Return the offset into the GOT of GOT entry I.
1499 got_offset(unsigned int i) const
1500 { return i * (size / 8); }
1502 // Return the offset into the GOT of the last entry added.
1504 last_got_offset() const
1505 { return this->got_offset(this->entries_.size() - 1); }
1507 // Set the size of the section.
1510 { this->set_current_data_size(this->got_offset(this->entries_.size())); }
1512 // The list of GOT entries.
1513 Got_entries entries_;
1516 // Output_data_dynamic is used to hold the data in SHT_DYNAMIC
1519 class Output_data_dynamic : public Output_section_data
1522 Output_data_dynamic(Stringpool* pool)
1523 : Output_section_data(Output_data::default_alignment()),
1524 entries_(), pool_(pool)
1527 // Add a new dynamic entry with a fixed numeric value.
1529 add_constant(elfcpp::DT tag, unsigned int val)
1530 { this->add_entry(Dynamic_entry(tag, val)); }
1532 // Add a new dynamic entry with the address of output data.
1534 add_section_address(elfcpp::DT tag, const Output_data* od)
1535 { this->add_entry(Dynamic_entry(tag, od, false)); }
1537 // Add a new dynamic entry with the size of output data.
1539 add_section_size(elfcpp::DT tag, const Output_data* od)
1540 { this->add_entry(Dynamic_entry(tag, od, true)); }
1542 // Add a new dynamic entry with the address of a symbol.
1544 add_symbol(elfcpp::DT tag, const Symbol* sym)
1545 { this->add_entry(Dynamic_entry(tag, sym)); }
1547 // Add a new dynamic entry with a string.
1549 add_string(elfcpp::DT tag, const char* str)
1550 { this->add_entry(Dynamic_entry(tag, this->pool_->add(str, true, NULL))); }
1553 add_string(elfcpp::DT tag, const std::string& str)
1554 { this->add_string(tag, str.c_str()); }
1557 // Adjust the output section to set the entry size.
1559 do_adjust_output_section(Output_section*);
1561 // Set the final data size.
1563 set_final_data_size();
1565 // Write out the dynamic entries.
1567 do_write(Output_file*);
1570 // This POD class holds a single dynamic entry.
1574 // Create an entry with a fixed numeric value.
1575 Dynamic_entry(elfcpp::DT tag, unsigned int val)
1576 : tag_(tag), classification_(DYNAMIC_NUMBER)
1577 { this->u_.val = val; }
1579 // Create an entry with the size or address of a section.
1580 Dynamic_entry(elfcpp::DT tag, const Output_data* od, bool section_size)
1582 classification_(section_size
1583 ? DYNAMIC_SECTION_SIZE
1584 : DYNAMIC_SECTION_ADDRESS)
1585 { this->u_.od = od; }
1587 // Create an entry with the address of a symbol.
1588 Dynamic_entry(elfcpp::DT tag, const Symbol* sym)
1589 : tag_(tag), classification_(DYNAMIC_SYMBOL)
1590 { this->u_.sym = sym; }
1592 // Create an entry with a string.
1593 Dynamic_entry(elfcpp::DT tag, const char* str)
1594 : tag_(tag), classification_(DYNAMIC_STRING)
1595 { this->u_.str = str; }
1597 // Write the dynamic entry to an output view.
1598 template<int size, bool big_endian>
1600 write(unsigned char* pov, const Stringpool*) const;
1608 DYNAMIC_SECTION_ADDRESS,
1610 DYNAMIC_SECTION_SIZE,
1619 // For DYNAMIC_NUMBER.
1621 // For DYNAMIC_SECTION_ADDRESS and DYNAMIC_SECTION_SIZE.
1622 const Output_data* od;
1623 // For DYNAMIC_SYMBOL.
1625 // For DYNAMIC_STRING.
1630 // The type of entry.
1631 Classification classification_;
1634 // Add an entry to the list.
1636 add_entry(const Dynamic_entry& entry)
1637 { this->entries_.push_back(entry); }
1639 // Sized version of write function.
1640 template<int size, bool big_endian>
1642 sized_write(Output_file* of);
1644 // The type of the list of entries.
1645 typedef std::vector<Dynamic_entry> Dynamic_entries;
1648 Dynamic_entries entries_;
1649 // The pool used for strings.
1653 // An output section. We don't expect to have too many output
1654 // sections, so we don't bother to do a template on the size.
1656 class Output_section : public Output_data
1659 // Create an output section, giving the name, type, and flags.
1660 Output_section(const char* name, elfcpp::Elf_Word, elfcpp::Elf_Xword);
1661 virtual ~Output_section();
1663 // Add a new input section SHNDX, named NAME, with header SHDR, from
1664 // object OBJECT. RELOC_SHNDX is the index of a relocation section
1665 // which applies to this section, or 0 if none, or -1U if more than
1666 // one. HAVE_SECTIONS_SCRIPT is true if we have a SECTIONS clause
1667 // in a linker script; in that case we need to keep track of input
1668 // sections associated with an output section. Return the offset
1669 // within the output section.
1670 template<int size, bool big_endian>
1672 add_input_section(Sized_relobj<size, big_endian>* object, unsigned int shndx,
1674 const elfcpp::Shdr<size, big_endian>& shdr,
1675 unsigned int reloc_shndx, bool have_sections_script);
1677 // Add generated data POSD to this output section.
1679 add_output_section_data(Output_section_data* posd);
1681 // Return the section name.
1684 { return this->name_; }
1686 // Return the section type.
1689 { return this->type_; }
1691 // Return the section flags.
1694 { return this->flags_; }
1696 // Set the section flags. This may only be used with the Layout
1697 // code when it is prepared to move the section to a different
1700 set_flags(elfcpp::Elf_Xword flags)
1701 { this->flags_ = flags; }
1703 // Return the entsize field.
1706 { return this->entsize_; }
1708 // Set the entsize field.
1710 set_entsize(uint64_t v);
1712 // Set the load address.
1714 set_load_address(uint64_t load_address)
1716 this->load_address_ = load_address;
1717 this->has_load_address_ = true;
1720 // Set the link field to the output section index of a section.
1722 set_link_section(const Output_data* od)
1724 gold_assert(this->link_ == 0
1725 && !this->should_link_to_symtab_
1726 && !this->should_link_to_dynsym_);
1727 this->link_section_ = od;
1730 // Set the link field to a constant.
1732 set_link(unsigned int v)
1734 gold_assert(this->link_section_ == NULL
1735 && !this->should_link_to_symtab_
1736 && !this->should_link_to_dynsym_);
1740 // Record that this section should link to the normal symbol table.
1742 set_should_link_to_symtab()
1744 gold_assert(this->link_section_ == NULL
1746 && !this->should_link_to_dynsym_);
1747 this->should_link_to_symtab_ = true;
1750 // Record that this section should link to the dynamic symbol table.
1752 set_should_link_to_dynsym()
1754 gold_assert(this->link_section_ == NULL
1756 && !this->should_link_to_symtab_);
1757 this->should_link_to_dynsym_ = true;
1760 // Return the info field.
1764 gold_assert(this->info_section_ == NULL
1765 && this->info_symndx_ == NULL);
1769 // Set the info field to the output section index of a section.
1771 set_info_section(const Output_section* os)
1773 gold_assert((this->info_section_ == NULL
1774 || (this->info_section_ == os
1775 && this->info_uses_section_index_))
1776 && this->info_symndx_ == NULL
1777 && this->info_ == 0);
1778 this->info_section_ = os;
1779 this->info_uses_section_index_= true;
1782 // Set the info field to the symbol table index of a symbol.
1784 set_info_symndx(const Symbol* sym)
1786 gold_assert(this->info_section_ == NULL
1787 && (this->info_symndx_ == NULL
1788 || this->info_symndx_ == sym)
1789 && this->info_ == 0);
1790 this->info_symndx_ = sym;
1793 // Set the info field to the symbol table index of a section symbol.
1795 set_info_section_symndx(const Output_section* os)
1797 gold_assert((this->info_section_ == NULL
1798 || (this->info_section_ == os
1799 && !this->info_uses_section_index_))
1800 && this->info_symndx_ == NULL
1801 && this->info_ == 0);
1802 this->info_section_ = os;
1803 this->info_uses_section_index_ = false;
1806 // Set the info field to a constant.
1808 set_info(unsigned int v)
1810 gold_assert(this->info_section_ == NULL
1811 && this->info_symndx_ == NULL
1812 && (this->info_ == 0
1813 || this->info_ == v));
1817 // Set the addralign field.
1819 set_addralign(uint64_t v)
1820 { this->addralign_ = v; }
1822 // Indicate that we need a symtab index.
1824 set_needs_symtab_index()
1825 { this->needs_symtab_index_ = true; }
1827 // Return whether we need a symtab index.
1829 needs_symtab_index() const
1830 { return this->needs_symtab_index_; }
1832 // Get the symtab index.
1834 symtab_index() const
1836 gold_assert(this->symtab_index_ != 0);
1837 return this->symtab_index_;
1840 // Set the symtab index.
1842 set_symtab_index(unsigned int index)
1844 gold_assert(index != 0);
1845 this->symtab_index_ = index;
1848 // Indicate that we need a dynsym index.
1850 set_needs_dynsym_index()
1851 { this->needs_dynsym_index_ = true; }
1853 // Return whether we need a dynsym index.
1855 needs_dynsym_index() const
1856 { return this->needs_dynsym_index_; }
1858 // Get the dynsym index.
1860 dynsym_index() const
1862 gold_assert(this->dynsym_index_ != 0);
1863 return this->dynsym_index_;
1866 // Set the dynsym index.
1868 set_dynsym_index(unsigned int index)
1870 gold_assert(index != 0);
1871 this->dynsym_index_ = index;
1874 // Return whether the input sections sections attachd to this output
1875 // section may require sorting. This is used to handle constructor
1876 // priorities compatibly with GNU ld.
1878 may_sort_attached_input_sections() const
1879 { return this->may_sort_attached_input_sections_; }
1881 // Record that the input sections attached to this output section
1882 // may require sorting.
1884 set_may_sort_attached_input_sections()
1885 { this->may_sort_attached_input_sections_ = true; }
1887 // Return whether the input sections attached to this output section
1888 // require sorting. This is used to handle constructor priorities
1889 // compatibly with GNU ld.
1891 must_sort_attached_input_sections() const
1892 { return this->must_sort_attached_input_sections_; }
1894 // Record that the input sections attached to this output section
1897 set_must_sort_attached_input_sections()
1898 { this->must_sort_attached_input_sections_ = true; }
1900 // Return whether this section should be written after all the input
1901 // sections are complete.
1903 after_input_sections() const
1904 { return this->after_input_sections_; }
1906 // Record that this section should be written after all the input
1907 // sections are complete.
1909 set_after_input_sections()
1910 { this->after_input_sections_ = true; }
1912 // Return whether this section requires postprocessing after all
1913 // relocations have been applied.
1915 requires_postprocessing() const
1916 { return this->requires_postprocessing_; }
1918 // If a section requires postprocessing, return the buffer to use.
1920 postprocessing_buffer() const
1922 gold_assert(this->postprocessing_buffer_ != NULL);
1923 return this->postprocessing_buffer_;
1926 // If a section requires postprocessing, create the buffer to use.
1928 create_postprocessing_buffer();
1930 // If a section requires postprocessing, this is the size of the
1931 // buffer to which relocations should be applied.
1933 postprocessing_buffer_size() const
1934 { return this->current_data_size_for_child(); }
1936 // Modify the section name. This is only permitted for an
1937 // unallocated section, and only before the size has been finalized.
1938 // Otherwise the name will not get into Layout::namepool_.
1940 set_name(const char* newname)
1942 gold_assert((this->flags_ & elfcpp::SHF_ALLOC) == 0);
1943 gold_assert(!this->is_data_size_valid());
1944 this->name_ = newname;
1947 // Return whether the offset OFFSET in the input section SHNDX in
1948 // object OBJECT is being included in the link.
1950 is_input_address_mapped(const Relobj* object, unsigned int shndx,
1951 off_t offset) const;
1953 // Return the offset within the output section of OFFSET relative to
1954 // the start of input section SHNDX in object OBJECT.
1956 output_offset(const Relobj* object, unsigned int shndx,
1957 section_offset_type offset) const;
1959 // Return the output virtual address of OFFSET relative to the start
1960 // of input section SHNDX in object OBJECT.
1962 output_address(const Relobj* object, unsigned int shndx,
1963 off_t offset) const;
1965 // Return the output address of the start of the merged section for
1966 // input section SHNDX in object OBJECT. This is not necessarily
1967 // the offset corresponding to input offset 0 in the section, since
1968 // the section may be mapped arbitrarily.
1970 starting_output_address(const Relobj* object, unsigned int shndx) const;
1972 // Record that this output section was found in the SECTIONS clause
1973 // of a linker script.
1975 set_found_in_sections_clause()
1976 { this->found_in_sections_clause_ = true; }
1978 // Return whether this output section was found in the SECTIONS
1979 // clause of a linker script.
1981 found_in_sections_clause() const
1982 { return this->found_in_sections_clause_; }
1984 // Write the section header into *OPHDR.
1985 template<int size, bool big_endian>
1987 write_header(const Layout*, const Stringpool*,
1988 elfcpp::Shdr_write<size, big_endian>*) const;
1990 // The next few calls are for linker script support.
1992 // Store the list of input sections for this Output_section into the
1993 // list passed in. This removes the input sections, leaving only
1994 // any Output_section_data elements. This returns the size of those
1995 // Output_section_data elements. ADDRESS is the address of this
1996 // output section. FILL is the fill value to use, in case there are
1997 // any spaces between the remaining Output_section_data elements.
1999 get_input_sections(uint64_t address, const std::string& fill,
2000 std::list<std::pair<Relobj*, unsigned int > >*);
2002 // Add an input section from a script.
2004 add_input_section_for_script(Relobj* object, unsigned int shndx,
2005 off_t data_size, uint64_t addralign);
2007 // Set the current size of the output section.
2009 set_current_data_size(off_t size)
2010 { this->set_current_data_size_for_child(size); }
2012 // Get the current size of the output section.
2014 current_data_size() const
2015 { return this->current_data_size_for_child(); }
2017 // End of linker script support.
2019 // Print merge statistics to stderr.
2021 print_merge_stats();
2024 // Return the output section--i.e., the object itself.
2029 // Return the section index in the output file.
2031 do_out_shndx() const
2033 gold_assert(this->out_shndx_ != -1U);
2034 return this->out_shndx_;
2037 // Set the output section index.
2039 do_set_out_shndx(unsigned int shndx)
2041 gold_assert(this->out_shndx_ == -1U || this->out_shndx_ == shndx);
2042 this->out_shndx_ = shndx;
2045 // Set the final data size of the Output_section. For a typical
2046 // Output_section, there is nothing to do, but if there are any
2047 // Output_section_data objects we need to set their final addresses
2050 set_final_data_size();
2052 // Reset the address and file offset.
2054 do_reset_address_and_file_offset();
2056 // Write the data to the file. For a typical Output_section, this
2057 // does nothing: the data is written out by calling Object::Relocate
2058 // on each input object. But if there are any Output_section_data
2059 // objects we do need to write them out here.
2061 do_write(Output_file*);
2063 // Return the address alignment--function required by parent class.
2065 do_addralign() const
2066 { return this->addralign_; }
2068 // Return whether there is a load address.
2070 do_has_load_address() const
2071 { return this->has_load_address_; }
2073 // Return the load address.
2075 do_load_address() const
2077 gold_assert(this->has_load_address_);
2078 return this->load_address_;
2081 // Return whether this is an Output_section.
2083 do_is_section() const
2086 // Return whether this is a section of the specified type.
2088 do_is_section_type(elfcpp::Elf_Word type) const
2089 { return this->type_ == type; }
2091 // Return whether the specified section flag is set.
2093 do_is_section_flag_set(elfcpp::Elf_Xword flag) const
2094 { return (this->flags_ & flag) != 0; }
2096 // Set the TLS offset. Called only for SHT_TLS sections.
2098 do_set_tls_offset(uint64_t tls_base);
2100 // Return the TLS offset, relative to the base of the TLS segment.
2101 // Valid only for SHT_TLS sections.
2103 do_tls_offset() const
2104 { return this->tls_offset_; }
2106 // This may be implemented by a child class.
2108 do_finalize_name(Layout*)
2111 // Record that this section requires postprocessing after all
2112 // relocations have been applied. This is called by a child class.
2114 set_requires_postprocessing()
2116 this->requires_postprocessing_ = true;
2117 this->after_input_sections_ = true;
2120 // Write all the data of an Output_section into the postprocessing
2123 write_to_postprocessing_buffer();
2126 // In some cases we need to keep a list of the input sections
2127 // associated with this output section. We only need the list if we
2128 // might have to change the offsets of the input section within the
2129 // output section after we add the input section. The ordinary
2130 // input sections will be written out when we process the object
2131 // file, and as such we don't need to track them here. We do need
2132 // to track Output_section_data objects here. We store instances of
2133 // this structure in a std::vector, so it must be a POD. There can
2134 // be many instances of this structure, so we use a union to save
2140 : shndx_(0), p2align_(0)
2142 this->u1_.data_size = 0;
2143 this->u2_.object = NULL;
2146 // For an ordinary input section.
2147 Input_section(Relobj* object, unsigned int shndx, off_t data_size,
2150 p2align_(ffsll(static_cast<long long>(addralign)))
2152 gold_assert(shndx != OUTPUT_SECTION_CODE
2153 && shndx != MERGE_DATA_SECTION_CODE
2154 && shndx != MERGE_STRING_SECTION_CODE);
2155 this->u1_.data_size = data_size;
2156 this->u2_.object = object;
2159 // For a non-merge output section.
2160 Input_section(Output_section_data* posd)
2161 : shndx_(OUTPUT_SECTION_CODE),
2162 p2align_(ffsll(static_cast<long long>(posd->addralign())))
2164 this->u1_.data_size = 0;
2165 this->u2_.posd = posd;
2168 // For a merge section.
2169 Input_section(Output_section_data* posd, bool is_string, uint64_t entsize)
2171 ? MERGE_STRING_SECTION_CODE
2172 : MERGE_DATA_SECTION_CODE),
2173 p2align_(ffsll(static_cast<long long>(posd->addralign())))
2175 this->u1_.entsize = entsize;
2176 this->u2_.posd = posd;
2179 // The required alignment.
2183 return (this->p2align_ == 0
2185 : static_cast<uint64_t>(1) << (this->p2align_ - 1));
2188 // Return the required size.
2192 // Whether this is an input section.
2194 is_input_section() const
2196 return (this->shndx_ != OUTPUT_SECTION_CODE
2197 && this->shndx_ != MERGE_DATA_SECTION_CODE
2198 && this->shndx_ != MERGE_STRING_SECTION_CODE);
2201 // Return whether this is a merge section which matches the
2204 is_merge_section(bool is_string, uint64_t entsize,
2205 uint64_t addralign) const
2207 return (this->shndx_ == (is_string
2208 ? MERGE_STRING_SECTION_CODE
2209 : MERGE_DATA_SECTION_CODE)
2210 && this->u1_.entsize == entsize
2211 && this->addralign() == addralign);
2214 // Return the object for an input section.
2218 gold_assert(this->is_input_section());
2219 return this->u2_.object;
2222 // Return the input section index for an input section.
2226 gold_assert(this->is_input_section());
2227 return this->shndx_;
2230 // Set the output section.
2232 set_output_section(Output_section* os)
2234 gold_assert(!this->is_input_section());
2235 this->u2_.posd->set_output_section(os);
2238 // Set the address and file offset. This is called during
2239 // Layout::finalize. SECTION_FILE_OFFSET is the file offset of
2240 // the enclosing section.
2242 set_address_and_file_offset(uint64_t address, off_t file_offset,
2243 off_t section_file_offset);
2245 // Reset the address and file offset.
2247 reset_address_and_file_offset();
2249 // Finalize the data size.
2251 finalize_data_size();
2253 // Add an input section, for SHF_MERGE sections.
2255 add_input_section(Relobj* object, unsigned int shndx)
2257 gold_assert(this->shndx_ == MERGE_DATA_SECTION_CODE
2258 || this->shndx_ == MERGE_STRING_SECTION_CODE);
2259 return this->u2_.posd->add_input_section(object, shndx);
2262 // Given an input OBJECT, an input section index SHNDX within that
2263 // object, and an OFFSET relative to the start of that input
2264 // section, return whether or not the output offset is known. If
2265 // this function returns true, it sets *POUTPUT to the offset in
2266 // the output section, relative to the start of the input section
2267 // in the output section. *POUTPUT may be different from OFFSET
2268 // for a merged section.
2270 output_offset(const Relobj* object, unsigned int shndx,
2271 section_offset_type offset,
2272 section_offset_type *poutput) const;
2274 // Return whether this is the merge section for the input section
2277 is_merge_section_for(const Relobj* object, unsigned int shndx) const;
2279 // Write out the data. This does nothing for an input section.
2281 write(Output_file*);
2283 // Write the data to a buffer. This does nothing for an input
2286 write_to_buffer(unsigned char*);
2288 // Print statistics about merge sections to stderr.
2290 print_merge_stats(const char* section_name)
2292 if (this->shndx_ == MERGE_DATA_SECTION_CODE
2293 || this->shndx_ == MERGE_STRING_SECTION_CODE)
2294 this->u2_.posd->print_merge_stats(section_name);
2298 // Code values which appear in shndx_. If the value is not one of
2299 // these codes, it is the input section index in the object file.
2302 // An Output_section_data.
2303 OUTPUT_SECTION_CODE = -1U,
2304 // An Output_section_data for an SHF_MERGE section with
2305 // SHF_STRINGS not set.
2306 MERGE_DATA_SECTION_CODE = -2U,
2307 // An Output_section_data for an SHF_MERGE section with
2309 MERGE_STRING_SECTION_CODE = -3U
2312 // For an ordinary input section, this is the section index in the
2313 // input file. For an Output_section_data, this is
2314 // OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
2315 // MERGE_STRING_SECTION_CODE.
2316 unsigned int shndx_;
2317 // The required alignment, stored as a power of 2.
2318 unsigned int p2align_;
2321 // For an ordinary input section, the section size.
2323 // For OUTPUT_SECTION_CODE, this is not used. For
2324 // MERGE_DATA_SECTION_CODE or MERGE_STRING_SECTION_CODE, the
2330 // For an ordinary input section, the object which holds the
2333 // For OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
2334 // MERGE_STRING_SECTION_CODE, the data.
2335 Output_section_data* posd;
2339 typedef std::vector<Input_section> Input_section_list;
2341 // This class is used to sort the input sections.
2342 class Input_section_sort_entry;
2344 // This is the sort comparison function.
2345 struct Input_section_sort_compare
2348 operator()(const Input_section_sort_entry&,
2349 const Input_section_sort_entry&) const;
2352 // Fill data. This is used to fill in data between input sections.
2353 // It is also used for data statements (BYTE, WORD, etc.) in linker
2354 // scripts. When we have to keep track of the input sections, we
2355 // can use an Output_data_const, but we don't want to have to keep
2356 // track of input sections just to implement fills.
2360 Fill(off_t section_offset, off_t length)
2361 : section_offset_(section_offset),
2362 length_(convert_to_section_size_type(length))
2365 // Return section offset.
2367 section_offset() const
2368 { return this->section_offset_; }
2370 // Return fill length.
2373 { return this->length_; }
2376 // The offset within the output section.
2377 off_t section_offset_;
2378 // The length of the space to fill.
2379 section_size_type length_;
2382 typedef std::vector<Fill> Fill_list;
2384 // Add a new output section by Input_section.
2386 add_output_section_data(Input_section*);
2388 // Add an SHF_MERGE input section. Returns true if the section was
2391 add_merge_input_section(Relobj* object, unsigned int shndx, uint64_t flags,
2392 uint64_t entsize, uint64_t addralign);
2394 // Add an output SHF_MERGE section POSD to this output section.
2395 // IS_STRING indicates whether it is a SHF_STRINGS section, and
2396 // ENTSIZE is the entity size. This returns the entry added to
2399 add_output_merge_section(Output_section_data* posd, bool is_string,
2402 // Sort the attached input sections.
2404 sort_attached_input_sections();
2406 // Most of these fields are only valid after layout.
2408 // The name of the section. This will point into a Stringpool.
2410 // The section address is in the parent class.
2411 // The section alignment.
2412 uint64_t addralign_;
2413 // The section entry size.
2415 // The load address. This is only used when using a linker script
2416 // with a SECTIONS clause. The has_load_address_ field indicates
2417 // whether this field is valid.
2418 uint64_t load_address_;
2419 // The file offset is in the parent class.
2420 // Set the section link field to the index of this section.
2421 const Output_data* link_section_;
2422 // If link_section_ is NULL, this is the link field.
2424 // Set the section info field to the index of this section.
2425 const Output_section* info_section_;
2426 // If info_section_ is NULL, set the info field to the symbol table
2427 // index of this symbol.
2428 const Symbol* info_symndx_;
2429 // If info_section_ and info_symndx_ are NULL, this is the section
2432 // The section type.
2433 const elfcpp::Elf_Word type_;
2434 // The section flags.
2435 elfcpp::Elf_Xword flags_;
2436 // The section index.
2437 unsigned int out_shndx_;
2438 // If there is a STT_SECTION for this output section in the normal
2439 // symbol table, this is the symbol index. This starts out as zero.
2440 // It is initialized in Layout::finalize() to be the index, or -1U
2441 // if there isn't one.
2442 unsigned int symtab_index_;
2443 // If there is a STT_SECTION for this output section in the dynamic
2444 // symbol table, this is the symbol index. This starts out as zero.
2445 // It is initialized in Layout::finalize() to be the index, or -1U
2446 // if there isn't one.
2447 unsigned int dynsym_index_;
2448 // The input sections. This will be empty in cases where we don't
2449 // need to keep track of them.
2450 Input_section_list input_sections_;
2451 // The offset of the first entry in input_sections_.
2452 off_t first_input_offset_;
2453 // The fill data. This is separate from input_sections_ because we
2454 // often will need fill sections without needing to keep track of
2457 // If the section requires postprocessing, this buffer holds the
2458 // section contents during relocation.
2459 unsigned char* postprocessing_buffer_;
2460 // Whether this output section needs a STT_SECTION symbol in the
2461 // normal symbol table. This will be true if there is a relocation
2463 bool needs_symtab_index_ : 1;
2464 // Whether this output section needs a STT_SECTION symbol in the
2465 // dynamic symbol table. This will be true if there is a dynamic
2466 // relocation which needs it.
2467 bool needs_dynsym_index_ : 1;
2468 // Whether the link field of this output section should point to the
2469 // normal symbol table.
2470 bool should_link_to_symtab_ : 1;
2471 // Whether the link field of this output section should point to the
2472 // dynamic symbol table.
2473 bool should_link_to_dynsym_ : 1;
2474 // Whether this section should be written after all the input
2475 // sections are complete.
2476 bool after_input_sections_ : 1;
2477 // Whether this section requires post processing after all
2478 // relocations have been applied.
2479 bool requires_postprocessing_ : 1;
2480 // Whether an input section was mapped to this output section
2481 // because of a SECTIONS clause in a linker script.
2482 bool found_in_sections_clause_ : 1;
2483 // Whether this section has an explicitly specified load address.
2484 bool has_load_address_ : 1;
2485 // True if the info_section_ field means the section index of the
2486 // section, false if it means the symbol index of the corresponding
2488 bool info_uses_section_index_ : 1;
2489 // True if the input sections attached to this output section may
2491 bool may_sort_attached_input_sections_ : 1;
2492 // True if the input sections attached to this output section must
2494 bool must_sort_attached_input_sections_ : 1;
2495 // True if the input sections attached to this output section have
2496 // already been sorted.
2497 bool attached_input_sections_are_sorted_ : 1;
2498 // For SHT_TLS sections, the offset of this section relative to the base
2499 // of the TLS segment.
2500 uint64_t tls_offset_;
2503 // An output segment. PT_LOAD segments are built from collections of
2504 // output sections. Other segments typically point within PT_LOAD
2505 // segments, and are built directly as needed.
2507 class Output_segment
2510 // Create an output segment, specifying the type and flags.
2511 Output_segment(elfcpp::Elf_Word, elfcpp::Elf_Word);
2513 // Return the virtual address.
2516 { return this->vaddr_; }
2518 // Return the physical address.
2521 { return this->paddr_; }
2523 // Return the segment type.
2526 { return this->type_; }
2528 // Return the segment flags.
2531 { return this->flags_; }
2533 // Return the memory size.
2536 { return this->memsz_; }
2538 // Return the file size.
2541 { return this->filesz_; }
2543 // Return the file offset.
2546 { return this->offset_; }
2548 // Return the maximum alignment of the Output_data.
2550 maximum_alignment();
2552 // Add an Output_section to this segment.
2554 add_output_section(Output_section* os, elfcpp::Elf_Word seg_flags)
2555 { this->add_output_section(os, seg_flags, false); }
2557 // Add an Output_section to the start of this segment.
2559 add_initial_output_section(Output_section* os, elfcpp::Elf_Word seg_flags)
2560 { this->add_output_section(os, seg_flags, true); }
2562 // Remove an Output_section from this segment. It is an error if it
2565 remove_output_section(Output_section* os);
2567 // Add an Output_data (which is not an Output_section) to the start
2570 add_initial_output_data(Output_data*);
2572 // Return true if this segment has any sections which hold actual
2573 // data, rather than being a BSS section.
2575 has_any_data_sections() const
2576 { return !this->output_data_.empty(); }
2578 // Return the number of dynamic relocations applied to this segment.
2580 dynamic_reloc_count() const;
2582 // Return the address of the first section.
2584 first_section_load_address() const;
2586 // Return whether the addresses have been set already.
2588 are_addresses_set() const
2589 { return this->are_addresses_set_; }
2591 // Set the addresses.
2593 set_addresses(uint64_t vaddr, uint64_t paddr)
2595 this->vaddr_ = vaddr;
2596 this->paddr_ = paddr;
2597 this->are_addresses_set_ = true;
2600 // Set the segment flags. This is only used if we have a PHDRS
2601 // clause which explicitly specifies the flags.
2603 set_flags(elfcpp::Elf_Word flags)
2604 { this->flags_ = flags; }
2606 // Set the address of the segment to ADDR and the offset to *POFF
2607 // and set the addresses and offsets of all contained output
2608 // sections accordingly. Set the section indexes of all contained
2609 // output sections starting with *PSHNDX. If RESET is true, first
2610 // reset the addresses of the contained sections. Return the
2611 // address of the immediately following segment. Update *POFF and
2612 // *PSHNDX. This should only be called for a PT_LOAD segment.
2614 set_section_addresses(const Layout*, bool reset, uint64_t addr, off_t* poff,
2615 unsigned int* pshndx);
2617 // Set the minimum alignment of this segment. This may be adjusted
2618 // upward based on the section alignments.
2620 set_minimum_p_align(uint64_t align)
2621 { this->min_p_align_ = align; }
2623 // Set the offset of this segment based on the section. This should
2624 // only be called for a non-PT_LOAD segment.
2628 // Set the TLS offsets of the sections contained in the PT_TLS segment.
2632 // Return the number of output sections.
2634 output_section_count() const;
2636 // Return the section attached to the list segment with the lowest
2637 // load address. This is used when handling a PHDRS clause in a
2640 section_with_lowest_load_address() const;
2642 // Write the segment header into *OPHDR.
2643 template<int size, bool big_endian>
2645 write_header(elfcpp::Phdr_write<size, big_endian>*);
2647 // Write the section headers of associated sections into V.
2648 template<int size, bool big_endian>
2650 write_section_headers(const Layout*, const Stringpool*, unsigned char* v,
2651 unsigned int* pshndx) const;
2654 Output_segment(const Output_segment&);
2655 Output_segment& operator=(const Output_segment&);
2657 typedef std::list<Output_data*> Output_data_list;
2659 // Add an Output_section to this segment, specifying front or back.
2661 add_output_section(Output_section*, elfcpp::Elf_Word seg_flags,
2664 // Find the maximum alignment in an Output_data_list.
2666 maximum_alignment_list(const Output_data_list*);
2668 // Set the section addresses in an Output_data_list.
2670 set_section_list_addresses(const Layout*, bool reset, Output_data_list*,
2671 uint64_t addr, off_t* poff, unsigned int* pshndx,
2674 // Return the number of Output_sections in an Output_data_list.
2676 output_section_count_list(const Output_data_list*) const;
2678 // Return the number of dynamic relocs in an Output_data_list.
2680 dynamic_reloc_count_list(const Output_data_list*) const;
2682 // Find the section with the lowest load address in an
2683 // Output_data_list.
2685 lowest_load_address_in_list(const Output_data_list* pdl,
2686 Output_section** found,
2687 uint64_t* found_lma) const;
2689 // Write the section headers in the list into V.
2690 template<int size, bool big_endian>
2692 write_section_headers_list(const Layout*, const Stringpool*,
2693 const Output_data_list*, unsigned char* v,
2694 unsigned int* pshdx) const;
2696 // The list of output data with contents attached to this segment.
2697 Output_data_list output_data_;
2698 // The list of output data without contents attached to this segment.
2699 Output_data_list output_bss_;
2700 // The segment virtual address.
2702 // The segment physical address.
2704 // The size of the segment in memory.
2706 // The maximum section alignment. The is_max_align_known_ field
2707 // indicates whether this has been finalized.
2708 uint64_t max_align_;
2709 // The required minimum value for the p_align field. This is used
2710 // for PT_LOAD segments. Note that this does not mean that
2711 // addresses should be aligned to this value; it means the p_paddr
2712 // and p_vaddr fields must be congruent modulo this value. For
2713 // non-PT_LOAD segments, the dynamic linker works more efficiently
2714 // if the p_align field has the more conventional value, although it
2715 // can align as needed.
2716 uint64_t min_p_align_;
2717 // The offset of the segment data within the file.
2719 // The size of the segment data in the file.
2721 // The segment type;
2722 elfcpp::Elf_Word type_;
2723 // The segment flags.
2724 elfcpp::Elf_Word flags_;
2725 // Whether we have finalized max_align_.
2726 bool is_max_align_known_ : 1;
2727 // Whether vaddr and paddr were set by a linker script.
2728 bool are_addresses_set_ : 1;
2731 // This class represents the output file.
2736 Output_file(const char* name);
2738 // Indicate that this is a temporary file which should not be
2742 { this->is_temporary_ = true; }
2744 // Open the output file. FILE_SIZE is the final size of the file.
2746 open(off_t file_size);
2748 // Resize the output file.
2750 resize(off_t file_size);
2752 // Close the output file (flushing all buffered data) and make sure
2753 // there are no errors.
2757 // We currently always use mmap which makes the view handling quite
2758 // simple. In the future we may support other approaches.
2760 // Write data to the output file.
2762 write(off_t offset, const void* data, size_t len)
2763 { memcpy(this->base_ + offset, data, len); }
2765 // Get a buffer to use to write to the file, given the offset into
2766 // the file and the size.
2768 get_output_view(off_t start, size_t size)
2770 gold_assert(start >= 0
2771 && start + static_cast<off_t>(size) <= this->file_size_);
2772 return this->base_ + start;
2775 // VIEW must have been returned by get_output_view. Write the
2776 // buffer to the file, passing in the offset and the size.
2778 write_output_view(off_t, size_t, unsigned char*)
2781 // Get a read/write buffer. This is used when we want to write part
2782 // of the file, read it in, and write it again.
2784 get_input_output_view(off_t start, size_t size)
2785 { return this->get_output_view(start, size); }
2787 // Write a read/write buffer back to the file.
2789 write_input_output_view(off_t, size_t, unsigned char*)
2792 // Get a read buffer. This is used when we just want to read part
2793 // of the file back it in.
2794 const unsigned char*
2795 get_input_view(off_t start, size_t size)
2796 { return this->get_output_view(start, size); }
2798 // Release a read bfufer.
2800 free_input_view(off_t, size_t, const unsigned char*)
2804 // Map the file into memory and return a pointer to the map.
2808 // Unmap the file from memory (and flush to disk buffers).
2818 // Base of file mapped into memory.
2819 unsigned char* base_;
2820 // True iff base_ points to a memory buffer rather than an output file.
2821 bool map_is_anonymous_;
2822 // True if this is a temporary file which should not be output.
2826 } // End namespace gold.
2828 #endif // !defined(GOLD_OUTPUT_H)