1 // output.h -- manage the output file for gold -*- C++ -*-
3 // Copyright 2006, 2007 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"
32 #include "parameters.h"
37 class General_options
;
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(off_t data_size
= 0)
54 : address_(0), data_size_(data_size
), offset_(-1)
60 // Return the address. This is only valid after Layout::finalize is
64 { return this->address_
; }
66 // Return the size of the data. This must be valid after
67 // Layout::finalize calls set_address, but need not be valid before
71 { return this->data_size_
; }
73 // Return the file offset. This is only valid after
74 // Layout::finalize is finished.
77 { return this->offset_
; }
79 // Return the required alignment.
82 { return this->do_addralign(); }
84 // Return whether this is an Output_section.
87 { return this->do_is_section(); }
89 // Return whether this is an Output_section of the specified type.
91 is_section_type(elfcpp::Elf_Word stt
) const
92 { return this->do_is_section_type(stt
); }
94 // Return whether this is an Output_section with the specified flag
97 is_section_flag_set(elfcpp::Elf_Xword shf
) const
98 { return this->do_is_section_flag_set(shf
); }
100 // Return the output section index, if there is an output section.
103 { return this->do_out_shndx(); }
105 // Set the output section index, if this is an output section.
107 set_out_shndx(unsigned int shndx
)
108 { this->do_set_out_shndx(shndx
); }
110 // Set the address and file offset of this data. This is called
111 // during Layout::finalize.
113 set_address(uint64_t addr
, off_t off
);
115 // Write the data to the output file. This is called after
116 // Layout::finalize is complete.
118 write(Output_file
* file
)
119 { this->do_write(file
); }
121 // This is called by Layout::finalize to note that all sizes must
125 { Output_data::sizes_are_fixed
= true; }
128 // Functions that child classes may or in some cases must implement.
130 // Write the data to the output file.
132 do_write(Output_file
*) = 0;
134 // Return the required alignment.
136 do_addralign() const = 0;
138 // Return whether this is an Output_section.
140 do_is_section() const
143 // Return whether this is an Output_section of the specified type.
144 // This only needs to be implement by Output_section.
146 do_is_section_type(elfcpp::Elf_Word
) const
149 // Return whether this is an Output_section with the specific flag
150 // set. This only needs to be implemented by Output_section.
152 do_is_section_flag_set(elfcpp::Elf_Xword
) const
155 // Return the output section index, if there is an output section.
158 { gold_unreachable(); }
160 // Set the output section index, if this is an output section.
162 do_set_out_shndx(unsigned int)
163 { gold_unreachable(); }
165 // Set the address and file offset of the data. This only needs to
166 // be implemented if the child needs to know. The child class can
167 // set its size in this call.
169 do_set_address(uint64_t, off_t
)
172 // Functions that child classes may call.
174 // Set the size of the data.
176 set_data_size(off_t data_size
)
178 gold_assert(!Output_data::sizes_are_fixed
);
179 this->data_size_
= data_size
;
182 // Return default alignment for a size--32 or 64.
184 default_alignment(int size
);
187 Output_data(const Output_data
&);
188 Output_data
& operator=(const Output_data
&);
190 // This is used for verification, to make sure that we don't try to
191 // change any sizes after we set the section addresses.
192 static bool sizes_are_fixed
;
194 // Memory address in file (not always meaningful).
196 // Size of data in file.
198 // Offset within file.
202 // Output the section headers.
204 class Output_section_headers
: public Output_data
207 Output_section_headers(const Layout
*,
208 const Layout::Segment_list
*,
209 const Layout::Section_list
*,
212 // Write the data to the file.
214 do_write(Output_file
*);
216 // Return the required alignment.
219 { return Output_data::default_alignment(parameters
->get_size()); }
222 // Write the data to the file with the right size and endianness.
223 template<int size
, bool big_endian
>
225 do_sized_write(Output_file
*);
227 const Layout
* layout_
;
228 const Layout::Segment_list
* segment_list_
;
229 const Layout::Section_list
* unattached_section_list_
;
230 const Stringpool
* secnamepool_
;
233 // Output the segment headers.
235 class Output_segment_headers
: public Output_data
238 Output_segment_headers(const Layout::Segment_list
& segment_list
);
240 // Write the data to the file.
242 do_write(Output_file
*);
244 // Return the required alignment.
247 { return Output_data::default_alignment(parameters
->get_size()); }
250 // Write the data to the file with the right size and endianness.
251 template<int size
, bool big_endian
>
253 do_sized_write(Output_file
*);
255 const Layout::Segment_list
& segment_list_
;
258 // Output the ELF file header.
260 class Output_file_header
: public Output_data
263 Output_file_header(const Target
*,
265 const Output_segment_headers
*);
267 // Add information about the section headers. We lay out the ELF
268 // file header before we create the section headers.
269 void set_section_info(const Output_section_headers
*,
270 const Output_section
* shstrtab
);
272 // Write the data to the file.
274 do_write(Output_file
*);
276 // Return the required alignment.
279 { return Output_data::default_alignment(parameters
->get_size()); }
281 // Set the address and offset--we only implement this for error
284 do_set_address(uint64_t, off_t off
) const
285 { gold_assert(off
== 0); }
288 // Write the data to the file with the right size and endianness.
289 template<int size
, bool big_endian
>
291 do_sized_write(Output_file
*);
293 const Target
* target_
;
294 const Symbol_table
* symtab_
;
295 const Output_segment_headers
* segment_header_
;
296 const Output_section_headers
* section_header_
;
297 const Output_section
* shstrtab_
;
300 // Output sections are mainly comprised of input sections. However,
301 // there are cases where we have data to write out which is not in an
302 // input section. Output_section_data is used in such cases. This is
303 // an abstract base class.
305 class Output_section_data
: public Output_data
308 Output_section_data(off_t data_size
, uint64_t addralign
)
309 : Output_data(data_size
), output_section_(NULL
), addralign_(addralign
)
312 Output_section_data(uint64_t addralign
)
313 : Output_data(0), output_section_(NULL
), addralign_(addralign
)
316 // Return the output section.
317 const Output_section
*
318 output_section() const
319 { return this->output_section_
; }
321 // Record the output section.
323 set_output_section(Output_section
* os
);
325 // Add an input section, for SHF_MERGE sections. This returns true
326 // if the section was handled.
328 add_input_section(Relobj
* object
, unsigned int shndx
)
329 { return this->do_add_input_section(object
, shndx
); }
331 // Given an input OBJECT, an input section index SHNDX within that
332 // object, and an OFFSET relative to the start of that input
333 // section, return whether or not the output address is known.
334 // OUTPUT_SECTION_ADDRESS is the address of the output section which
335 // this is a part of. If this function returns true, it sets
336 // *POUTPUT to the output address.
338 output_address(const Relobj
* object
, unsigned int shndx
, off_t offset
,
339 uint64_t output_section_address
, uint64_t *poutput
) const
341 return this->do_output_address(object
, shndx
, offset
,
342 output_section_address
, poutput
);
346 // The child class must implement do_write.
348 // The child class may implement specific adjustments to the output
351 do_adjust_output_section(Output_section
*)
354 // May be implemented by child class. Return true if the section
357 do_add_input_section(Relobj
*, unsigned int)
358 { gold_unreachable(); }
360 // The child class may implement output_address.
362 do_output_address(const Relobj
*, unsigned int, off_t
, uint64_t,
366 // Return the required alignment.
369 { return this->addralign_
; }
371 // Return the section index of the output section.
373 do_out_shndx() const;
375 // Set the alignment.
377 set_addralign(uint64_t addralign
)
378 { this->addralign_
= addralign
; }
381 // The output section for this section.
382 const Output_section
* output_section_
;
383 // The required alignment.
387 // A simple case of Output_data in which we have constant data to
390 class Output_data_const
: public Output_section_data
393 Output_data_const(const std::string
& data
, uint64_t addralign
)
394 : Output_section_data(data
.size(), addralign
), data_(data
)
397 Output_data_const(const char* p
, off_t len
, uint64_t addralign
)
398 : Output_section_data(len
, addralign
), data_(p
, len
)
401 Output_data_const(const unsigned char* p
, off_t len
, uint64_t addralign
)
402 : Output_section_data(len
, addralign
),
403 data_(reinterpret_cast<const char*>(p
), len
)
408 add_data(const std::string
& add
)
410 this->data_
.append(add
);
411 this->set_data_size(this->data_
.size());
414 // Write the data to the output file.
416 do_write(Output_file
*);
422 // Another version of Output_data with constant data, in which the
423 // buffer is allocated by the caller.
425 class Output_data_const_buffer
: public Output_section_data
428 Output_data_const_buffer(const unsigned char* p
, off_t len
,
430 : Output_section_data(len
, addralign
), p_(p
)
433 // Write the data the output file.
435 do_write(Output_file
*);
438 const unsigned char* p_
;
441 // A place holder for data written out via some other mechanism.
443 class Output_data_space
: public Output_section_data
446 Output_data_space(off_t data_size
, uint64_t addralign
)
447 : Output_section_data(data_size
, addralign
)
450 explicit Output_data_space(uint64_t addralign
)
451 : Output_section_data(addralign
)
456 set_space_size(off_t space_size
)
457 { this->set_data_size(space_size
); }
459 // Set the alignment.
461 set_space_alignment(uint64_t align
)
462 { this->set_addralign(align
); }
464 // Write out the data--this must be handled elsewhere.
466 do_write(Output_file
*)
470 // A string table which goes into an output section.
472 class Output_data_strtab
: public Output_section_data
475 Output_data_strtab(Stringpool
* strtab
)
476 : Output_section_data(1), strtab_(strtab
)
479 // This is called to set the address and file offset. Here we make
480 // sure that the Stringpool is finalized.
482 do_set_address(uint64_t, off_t
);
484 // Write out the data.
486 do_write(Output_file
*);
492 // This POD class is used to represent a single reloc in the output
493 // file. This could be a private class within Output_data_reloc, but
494 // the templatization is complex enough that I broke it out into a
495 // separate class. The class is templatized on either elfcpp::SHT_REL
496 // or elfcpp::SHT_RELA, and also on whether this is a dynamic
497 // relocation or an ordinary relocation.
499 // A relocation can be against a global symbol, a local symbol, an
500 // output section, or the undefined symbol at index 0. We represent
501 // the latter by using a NULL global symbol.
503 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
506 template<bool dynamic
, int size
, bool big_endian
>
507 class Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>
510 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
512 // An uninitialized entry. We need this because we want to put
513 // instances of this class into an STL container.
515 : local_sym_index_(INVALID_CODE
)
518 // A reloc against a global symbol.
520 Output_reloc(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
522 : address_(address
), local_sym_index_(GSYM_CODE
), type_(type
),
525 this->u1_
.gsym
= gsym
;
529 Output_reloc(Symbol
* gsym
, unsigned int type
, Relobj
* relobj
,
530 unsigned int shndx
, Address address
)
531 : address_(address
), local_sym_index_(GSYM_CODE
), type_(type
),
534 gold_assert(shndx
!= INVALID_CODE
);
535 this->u1_
.gsym
= gsym
;
536 this->u2_
.relobj
= relobj
;
539 // A reloc against a local symbol.
541 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
542 unsigned int local_sym_index
,
546 : address_(address
), local_sym_index_(local_sym_index
), type_(type
),
549 gold_assert(local_sym_index
!= GSYM_CODE
550 && local_sym_index
!= INVALID_CODE
);
551 this->u1_
.relobj
= relobj
;
555 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
556 unsigned int local_sym_index
,
560 : address_(address
), local_sym_index_(local_sym_index
), type_(type
),
563 gold_assert(local_sym_index
!= GSYM_CODE
564 && local_sym_index
!= INVALID_CODE
);
565 gold_assert(shndx
!= INVALID_CODE
);
566 this->u1_
.relobj
= relobj
;
567 this->u2_
.relobj
= relobj
;
570 // A reloc against the STT_SECTION symbol of an output section.
572 Output_reloc(Output_section
* os
, unsigned int type
, Output_data
* od
,
574 : address_(address
), local_sym_index_(SECTION_CODE
), type_(type
),
581 Output_reloc(Output_section
* os
, unsigned int type
, Relobj
* relobj
,
582 unsigned int shndx
, Address address
)
583 : address_(address
), local_sym_index_(SECTION_CODE
), type_(type
),
586 gold_assert(shndx
!= INVALID_CODE
);
588 this->u2_
.relobj
= relobj
;
591 // Write the reloc entry to an output view.
593 write(unsigned char* pov
) const;
595 // Write the offset and info fields to Write_rel.
596 template<typename Write_rel
>
597 void write_rel(Write_rel
*) const;
600 // Return the symbol index. We can't do a double template
601 // specialization, so we do a secondary template here.
603 get_symbol_index() const;
605 // Codes for local_sym_index_.
612 // Invalid uninitialized entry.
618 // For a local symbol, the object. We will never generate a
619 // relocation against a local symbol in a dynamic object; that
620 // doesn't make sense. And our callers will always be
621 // templatized, so we use Sized_relobj here.
622 Sized_relobj
<size
, big_endian
>* relobj
;
623 // For a global symbol, the symbol. If this is NULL, it indicates
624 // a relocation against the undefined 0 symbol.
626 // For a relocation against an output section, the output section.
631 // If shndx_ is not INVALID CODE, the object which holds the input
632 // section being used to specify the reloc address.
634 // If shndx_ is INVALID_CODE, the output data being used to
635 // specify the reloc address. This may be NULL if the reloc
636 // address is absolute.
639 // The address offset within the input section or the Output_data.
641 // For a local symbol, the local symbol index. This is GSYM_CODE
642 // for a global symbol, or INVALID_CODE for an uninitialized value.
643 unsigned int local_sym_index_
;
644 // The reloc type--a processor specific code.
646 // If the reloc address is an input section in an object, the
647 // section index. This is INVALID_CODE if the reloc address is
648 // specified in some other way.
652 // The SHT_RELA version of Output_reloc<>. This is just derived from
653 // the SHT_REL version of Output_reloc, but it adds an addend.
655 template<bool dynamic
, int size
, bool big_endian
>
656 class Output_reloc
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>
659 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
660 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Addend
;
662 // An uninitialized entry.
667 // A reloc against a global symbol.
669 Output_reloc(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
670 Address address
, Addend addend
)
671 : rel_(gsym
, type
, od
, address
), addend_(addend
)
674 Output_reloc(Symbol
* gsym
, unsigned int type
, Relobj
* relobj
,
675 unsigned int shndx
, Address address
, Addend addend
)
676 : rel_(gsym
, type
, relobj
, shndx
, address
), addend_(addend
)
679 // A reloc against a local symbol.
681 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
682 unsigned int local_sym_index
,
683 unsigned int type
, Output_data
* od
, Address address
,
685 : rel_(relobj
, local_sym_index
, type
, od
, address
), addend_(addend
)
688 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
689 unsigned int local_sym_index
,
694 : rel_(relobj
, local_sym_index
, type
, shndx
, address
),
698 // A reloc against the STT_SECTION symbol of an output section.
700 Output_reloc(Output_section
* os
, unsigned int type
, Output_data
* od
,
701 Address address
, Addend addend
)
702 : rel_(os
, type
, od
, address
), addend_(addend
)
705 Output_reloc(Output_section
* os
, unsigned int type
, Relobj
* relobj
,
706 unsigned int shndx
, Address address
, Addend addend
)
707 : rel_(os
, type
, relobj
, shndx
, address
), addend_(addend
)
710 // Write the reloc entry to an output view.
712 write(unsigned char* pov
) const;
716 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
> rel_
;
721 // Output_data_reloc is used to manage a section containing relocs.
722 // SH_TYPE is either elfcpp::SHT_REL or elfcpp::SHT_RELA. DYNAMIC
723 // indicates whether this is a dynamic relocation or a normal
724 // relocation. Output_data_reloc_base is a base class.
725 // Output_data_reloc is the real class, which we specialize based on
728 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
729 class Output_data_reloc_base
: public Output_section_data
732 typedef Output_reloc
<sh_type
, dynamic
, size
, big_endian
> Output_reloc_type
;
733 typedef typename
Output_reloc_type::Address Address
;
734 static const int reloc_size
=
735 Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
;
737 // Construct the section.
738 Output_data_reloc_base()
739 : Output_section_data(Output_data::default_alignment(size
))
742 // Write out the data.
744 do_write(Output_file
*);
747 // Set the entry size and the link.
749 do_adjust_output_section(Output_section
*os
);
751 // Add a relocation entry.
753 add(const Output_reloc_type
& reloc
)
755 this->relocs_
.push_back(reloc
);
756 this->set_data_size(this->relocs_
.size() * reloc_size
);
760 typedef std::vector
<Output_reloc_type
> Relocs
;
765 // The class which callers actually create.
767 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
768 class Output_data_reloc
;
770 // The SHT_REL version of Output_data_reloc.
772 template<bool dynamic
, int size
, bool big_endian
>
773 class Output_data_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>
774 : public Output_data_reloc_base
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>
777 typedef Output_data_reloc_base
<elfcpp::SHT_REL
, dynamic
, size
,
781 typedef typename
Base::Output_reloc_type Output_reloc_type
;
782 typedef typename
Output_reloc_type::Address Address
;
785 : Output_data_reloc_base
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>()
788 // Add a reloc against a global symbol.
791 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
, Address address
)
792 { this->add(Output_reloc_type(gsym
, type
, od
, address
)); }
795 add_global(Symbol
* gsym
, unsigned int type
, Relobj
* relobj
,
796 unsigned int shndx
, Address address
)
797 { this->add(Output_reloc_type(gsym
, type
, relobj
, shndx
, address
)); }
799 // Add a reloc against a local symbol.
802 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
803 unsigned int local_sym_index
, unsigned int type
,
804 Output_data
* od
, Address address
)
805 { this->add(Output_reloc_type(relobj
, local_sym_index
, type
, od
, address
)); }
808 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
809 unsigned int local_sym_index
, unsigned int type
,
810 unsigned int shndx
, Address address
)
811 { this->add(Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
815 // A reloc against the STT_SECTION symbol of an output section.
818 add_output_section(Output_section
* os
, unsigned int type
,
819 Output_data
* od
, Address address
)
820 { this->add(Output_reloc_type(os
, type
, od
, address
)); }
823 add_output_section(Output_section
* os
, unsigned int type
,
824 Relobj
* relobj
, unsigned int shndx
, Address address
)
825 { this->add(Output_reloc_type(os
, type
, relobj
, shndx
, address
)); }
828 // The SHT_RELA version of Output_data_reloc.
830 template<bool dynamic
, int size
, bool big_endian
>
831 class Output_data_reloc
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>
832 : public Output_data_reloc_base
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>
835 typedef Output_data_reloc_base
<elfcpp::SHT_RELA
, dynamic
, size
,
839 typedef typename
Base::Output_reloc_type Output_reloc_type
;
840 typedef typename
Output_reloc_type::Address Address
;
841 typedef typename
Output_reloc_type::Addend Addend
;
844 : Output_data_reloc_base
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>()
847 // Add a reloc against a global symbol.
850 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
851 Address address
, Addend addend
)
852 { this->add(Output_reloc_type(gsym
, type
, od
, address
, addend
)); }
855 add_global(Symbol
* gsym
, unsigned int type
, Relobj
* relobj
,
856 unsigned int shndx
, Address address
, Addend addend
)
857 { this->add(Output_reloc_type(gsym
, type
, relobj
, shndx
, address
, addend
)); }
859 // Add a reloc against a local symbol.
862 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
863 unsigned int local_sym_index
, unsigned int type
,
864 Output_data
* od
, Address address
, Addend addend
)
866 this->add(Output_reloc_type(relobj
, local_sym_index
, type
, od
, address
,
871 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
872 unsigned int local_sym_index
, unsigned int type
,
873 unsigned int shndx
, Address address
, Addend addend
)
875 this->add(Output_reloc_type(relobj
, local_sym_index
, type
, shndx
, address
,
879 // A reloc against the STT_SECTION symbol of an output section.
882 add_output_section(Output_section
* os
, unsigned int type
, Output_data
* od
,
883 Address address
, Addend addend
)
884 { this->add(Output_reloc_type(os
, type
, od
, address
, addend
)); }
887 add_output_section(Output_section
* os
, unsigned int type
, Relobj
* relobj
,
888 unsigned int shndx
, Address address
, Addend addend
)
889 { this->add(Output_reloc_type(os
, type
, relobj
, shndx
, address
, addend
)); }
892 // Output_data_got is used to manage a GOT. Each entry in the GOT is
893 // for one symbol--either a global symbol or a local symbol in an
894 // object. The target specific code adds entries to the GOT as
897 template<int size
, bool big_endian
>
898 class Output_data_got
: public Output_section_data
901 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Valtype
;
904 : Output_section_data(Output_data::default_alignment(size
)), entries_()
907 // Add an entry for a global symbol to the GOT. Return true if this
908 // is a new GOT entry, false if the symbol was already in the GOT.
910 add_global(Symbol
* gsym
);
912 // Add an entry for a local symbol to the GOT. This returns true if
913 // this is a new GOT entry, false if the symbol already has a GOT
916 add_local(Sized_relobj
<size
, big_endian
>* object
, unsigned int sym_index
);
918 // Add a constant to the GOT. This returns the offset of the new
919 // entry from the start of the GOT.
921 add_constant(Valtype constant
)
923 this->entries_
.push_back(Got_entry(constant
));
924 this->set_got_size();
925 return this->last_got_offset();
928 // Write out the GOT table.
930 do_write(Output_file
*);
933 // This POD class holds a single GOT entry.
937 // Create a zero entry.
939 : local_sym_index_(CONSTANT_CODE
)
940 { this->u_
.constant
= 0; }
942 // Create a global symbol entry.
943 explicit Got_entry(Symbol
* gsym
)
944 : local_sym_index_(GSYM_CODE
)
945 { this->u_
.gsym
= gsym
; }
947 // Create a local symbol entry.
948 Got_entry(Sized_relobj
<size
, big_endian
>* object
,
949 unsigned int local_sym_index
)
950 : local_sym_index_(local_sym_index
)
952 gold_assert(local_sym_index
!= GSYM_CODE
953 && local_sym_index
!= CONSTANT_CODE
);
954 this->u_
.object
= object
;
957 // Create a constant entry. The constant is a host value--it will
958 // be swapped, if necessary, when it is written out.
959 explicit Got_entry(Valtype constant
)
960 : local_sym_index_(CONSTANT_CODE
)
961 { this->u_
.constant
= constant
; }
963 // Write the GOT entry to an output view.
965 write(unsigned char* pov
) const;
976 // For a local symbol, the object.
977 Sized_relobj
<size
, big_endian
>* object
;
978 // For a global symbol, the symbol.
980 // For a constant, the constant.
983 // For a local symbol, the local symbol index. This is GSYM_CODE
984 // for a global symbol, or CONSTANT_CODE for a constant.
985 unsigned int local_sym_index_
;
988 typedef std::vector
<Got_entry
> Got_entries
;
990 // Return the offset into the GOT of GOT entry I.
992 got_offset(unsigned int i
) const
993 { return i
* (size
/ 8); }
995 // Return the offset into the GOT of the last entry added.
997 last_got_offset() const
998 { return this->got_offset(this->entries_
.size() - 1); }
1000 // Set the size of the section.
1003 { this->set_data_size(this->got_offset(this->entries_
.size())); }
1005 // The list of GOT entries.
1006 Got_entries entries_
;
1009 // Output_data_dynamic is used to hold the data in SHT_DYNAMIC
1012 class Output_data_dynamic
: public Output_section_data
1015 Output_data_dynamic(Stringpool
* pool
)
1016 : Output_section_data(Output_data::default_alignment(
1017 parameters
->get_size())),
1018 entries_(), pool_(pool
)
1021 // Add a new dynamic entry with a fixed numeric value.
1023 add_constant(elfcpp::DT tag
, unsigned int val
)
1024 { this->add_entry(Dynamic_entry(tag
, val
)); }
1026 // Add a new dynamic entry with the address of output data.
1028 add_section_address(elfcpp::DT tag
, const Output_data
* od
)
1029 { this->add_entry(Dynamic_entry(tag
, od
, false)); }
1031 // Add a new dynamic entry with the size of output data.
1033 add_section_size(elfcpp::DT tag
, const Output_data
* od
)
1034 { this->add_entry(Dynamic_entry(tag
, od
, true)); }
1036 // Add a new dynamic entry with the address of a symbol.
1038 add_symbol(elfcpp::DT tag
, const Symbol
* sym
)
1039 { this->add_entry(Dynamic_entry(tag
, sym
)); }
1041 // Add a new dynamic entry with a string.
1043 add_string(elfcpp::DT tag
, const char* str
)
1044 { this->add_entry(Dynamic_entry(tag
, this->pool_
->add(str
, true, NULL
))); }
1047 add_string(elfcpp::DT tag
, const std::string
& str
)
1048 { this->add_string(tag
, str
.c_str()); }
1050 // Set the final data size.
1052 do_set_address(uint64_t, off_t
);
1054 // Write out the dynamic entries.
1056 do_write(Output_file
*);
1059 // Adjust the output section to set the entry size.
1061 do_adjust_output_section(Output_section
*);
1064 // This POD class holds a single dynamic entry.
1068 // Create an entry with a fixed numeric value.
1069 Dynamic_entry(elfcpp::DT tag
, unsigned int val
)
1070 : tag_(tag
), classification_(DYNAMIC_NUMBER
)
1071 { this->u_
.val
= val
; }
1073 // Create an entry with the size or address of a section.
1074 Dynamic_entry(elfcpp::DT tag
, const Output_data
* od
, bool section_size
)
1076 classification_(section_size
1077 ? DYNAMIC_SECTION_SIZE
1078 : DYNAMIC_SECTION_ADDRESS
)
1079 { this->u_
.od
= od
; }
1081 // Create an entry with the address of a symbol.
1082 Dynamic_entry(elfcpp::DT tag
, const Symbol
* sym
)
1083 : tag_(tag
), classification_(DYNAMIC_SYMBOL
)
1084 { this->u_
.sym
= sym
; }
1086 // Create an entry with a string.
1087 Dynamic_entry(elfcpp::DT tag
, const char* str
)
1088 : tag_(tag
), classification_(DYNAMIC_STRING
)
1089 { this->u_
.str
= str
; }
1091 // Write the dynamic entry to an output view.
1092 template<int size
, bool big_endian
>
1094 write(unsigned char* pov
, const Stringpool
* ACCEPT_SIZE_ENDIAN
) const;
1102 DYNAMIC_SECTION_ADDRESS
,
1104 DYNAMIC_SECTION_SIZE
,
1113 // For DYNAMIC_NUMBER.
1115 // For DYNAMIC_SECTION_ADDRESS and DYNAMIC_SECTION_SIZE.
1116 const Output_data
* od
;
1117 // For DYNAMIC_SYMBOL.
1119 // For DYNAMIC_STRING.
1124 // The type of entry.
1125 Classification classification_
;
1128 // Add an entry to the list.
1130 add_entry(const Dynamic_entry
& entry
)
1131 { this->entries_
.push_back(entry
); }
1133 // Sized version of write function.
1134 template<int size
, bool big_endian
>
1136 sized_write(Output_file
* of
);
1138 // The type of the list of entries.
1139 typedef std::vector
<Dynamic_entry
> Dynamic_entries
;
1142 Dynamic_entries entries_
;
1143 // The pool used for strings.
1147 // An output section. We don't expect to have too many output
1148 // sections, so we don't bother to do a template on the size.
1150 class Output_section
: public Output_data
1153 // Create an output section, giving the name, type, and flags.
1154 Output_section(const char* name
, elfcpp::Elf_Word
, elfcpp::Elf_Xword
);
1155 virtual ~Output_section();
1157 // Add a new input section SHNDX, named NAME, with header SHDR, from
1158 // object OBJECT. Return the offset within the output section.
1159 template<int size
, bool big_endian
>
1161 add_input_section(Relobj
* object
, unsigned int shndx
, const char *name
,
1162 const elfcpp::Shdr
<size
, big_endian
>& shdr
);
1164 // Add generated data POSD to this output section.
1166 add_output_section_data(Output_section_data
* posd
);
1168 // Return the section name.
1171 { return this->name_
; }
1173 // Return the section type.
1176 { return this->type_
; }
1178 // Return the section flags.
1181 { return this->flags_
; }
1183 // Return the section index in the output file.
1185 do_out_shndx() const
1187 gold_assert(this->out_shndx_
!= -1U);
1188 return this->out_shndx_
;
1191 // Set the output section index.
1193 do_set_out_shndx(unsigned int shndx
)
1195 gold_assert(this->out_shndx_
== -1U);
1196 this->out_shndx_
= shndx
;
1199 // Return the entsize field.
1202 { return this->entsize_
; }
1204 // Set the entsize field.
1206 set_entsize(uint64_t v
);
1208 // Set the link field to the output section index of a section.
1210 set_link_section(const Output_data
* od
)
1212 gold_assert(this->link_
== 0
1213 && !this->should_link_to_symtab_
1214 && !this->should_link_to_dynsym_
);
1215 this->link_section_
= od
;
1218 // Set the link field to a constant.
1220 set_link(unsigned int v
)
1222 gold_assert(this->link_section_
== NULL
1223 && !this->should_link_to_symtab_
1224 && !this->should_link_to_dynsym_
);
1228 // Record that this section should link to the normal symbol table.
1230 set_should_link_to_symtab()
1232 gold_assert(this->link_section_
== NULL
1234 && !this->should_link_to_dynsym_
);
1235 this->should_link_to_symtab_
= true;
1238 // Record that this section should link to the dynamic symbol table.
1240 set_should_link_to_dynsym()
1242 gold_assert(this->link_section_
== NULL
1244 && !this->should_link_to_symtab_
);
1245 this->should_link_to_dynsym_
= true;
1248 // Return the info field.
1252 gold_assert(this->info_section_
== NULL
);
1256 // Set the info field to the output section index of a section.
1258 set_info_section(const Output_data
* od
)
1260 gold_assert(this->info_
== 0);
1261 this->info_section_
= od
;
1264 // Set the info field to a constant.
1266 set_info(unsigned int v
)
1268 gold_assert(this->info_section_
== NULL
);
1272 // Set the addralign field.
1274 set_addralign(uint64_t v
)
1275 { this->addralign_
= v
; }
1277 // Indicate that we need a symtab index.
1279 set_needs_symtab_index()
1280 { this->needs_symtab_index_
= true; }
1282 // Return whether we need a symtab index.
1284 needs_symtab_index() const
1285 { return this->needs_symtab_index_
; }
1287 // Get the symtab index.
1289 symtab_index() const
1291 gold_assert(this->symtab_index_
!= 0);
1292 return this->symtab_index_
;
1295 // Set the symtab index.
1297 set_symtab_index(unsigned int index
)
1299 gold_assert(index
!= 0);
1300 this->symtab_index_
= index
;
1303 // Indicate that we need a dynsym index.
1305 set_needs_dynsym_index()
1306 { this->needs_dynsym_index_
= true; }
1308 // Return whether we need a dynsym index.
1310 needs_dynsym_index() const
1311 { return this->needs_dynsym_index_
; }
1313 // Get the dynsym index.
1315 dynsym_index() const
1317 gold_assert(this->dynsym_index_
!= 0);
1318 return this->dynsym_index_
;
1321 // Set the dynsym index.
1323 set_dynsym_index(unsigned int index
)
1325 gold_assert(index
!= 0);
1326 this->dynsym_index_
= index
;
1329 // Return the output virtual address of OFFSET relative to the start
1330 // of input section SHNDX in object OBJECT.
1332 output_address(const Relobj
* object
, unsigned int shndx
,
1333 off_t offset
) const;
1335 // Set the address of the Output_section. For a typical
1336 // Output_section, there is nothing to do, but if there are any
1337 // Output_section_data objects we need to set the final addresses
1340 do_set_address(uint64_t, off_t
);
1342 // Write the data to the file. For a typical Output_section, this
1343 // does nothing: the data is written out by calling Object::Relocate
1344 // on each input object. But if there are any Output_section_data
1345 // objects we do need to write them out here.
1347 do_write(Output_file
*);
1349 // Return the address alignment--function required by parent class.
1351 do_addralign() const
1352 { return this->addralign_
; }
1354 // Return whether this is an Output_section.
1356 do_is_section() const
1359 // Return whether this is a section of the specified type.
1361 do_is_section_type(elfcpp::Elf_Word type
) const
1362 { return this->type_
== type
; }
1364 // Return whether the specified section flag is set.
1366 do_is_section_flag_set(elfcpp::Elf_Xword flag
) const
1367 { return (this->flags_
& flag
) != 0; }
1369 // Write the section header into *OPHDR.
1370 template<int size
, bool big_endian
>
1372 write_header(const Layout
*, const Stringpool
*,
1373 elfcpp::Shdr_write
<size
, big_endian
>*) const;
1376 // In some cases we need to keep a list of the input sections
1377 // associated with this output section. We only need the list if we
1378 // might have to change the offsets of the input section within the
1379 // output section after we add the input section. The ordinary
1380 // input sections will be written out when we process the object
1381 // file, and as such we don't need to track them here. We do need
1382 // to track Output_section_data objects here. We store instances of
1383 // this structure in a std::vector, so it must be a POD. There can
1384 // be many instances of this structure, so we use a union to save
1390 : shndx_(0), p2align_(0)
1392 this->u1_
.data_size
= 0;
1393 this->u2_
.object
= NULL
;
1396 // For an ordinary input section.
1397 Input_section(Relobj
* object
, unsigned int shndx
, off_t data_size
,
1400 p2align_(ffsll(static_cast<long long>(addralign
)))
1402 gold_assert(shndx
!= OUTPUT_SECTION_CODE
1403 && shndx
!= MERGE_DATA_SECTION_CODE
1404 && shndx
!= MERGE_STRING_SECTION_CODE
);
1405 this->u1_
.data_size
= data_size
;
1406 this->u2_
.object
= object
;
1409 // For a non-merge output section.
1410 Input_section(Output_section_data
* posd
)
1411 : shndx_(OUTPUT_SECTION_CODE
),
1412 p2align_(ffsll(static_cast<long long>(posd
->addralign())))
1414 this->u1_
.data_size
= 0;
1415 this->u2_
.posd
= posd
;
1418 // For a merge section.
1419 Input_section(Output_section_data
* posd
, bool is_string
, uint64_t entsize
)
1421 ? MERGE_STRING_SECTION_CODE
1422 : MERGE_DATA_SECTION_CODE
),
1423 p2align_(ffsll(static_cast<long long>(posd
->addralign())))
1425 this->u1_
.entsize
= entsize
;
1426 this->u2_
.posd
= posd
;
1429 // The required alignment.
1433 return (this->p2align_
== 0
1435 : static_cast<uint64_t>(1) << (this->p2align_
- 1));
1438 // Return the required size.
1442 // Return whether this is a merge section which matches the
1445 is_merge_section(bool is_string
, uint64_t entsize
,
1446 uint64_t addralign
) const
1448 return (this->shndx_
== (is_string
1449 ? MERGE_STRING_SECTION_CODE
1450 : MERGE_DATA_SECTION_CODE
)
1451 && this->u1_
.entsize
== entsize
1452 && this->addralign() == addralign
);
1455 // Set the output section.
1457 set_output_section(Output_section
* os
)
1459 gold_assert(!this->is_input_section());
1460 this->u2_
.posd
->set_output_section(os
);
1463 // Set the address and file offset. This is called during
1464 // Layout::finalize. SECOFF is the file offset of the enclosing
1467 set_address(uint64_t addr
, off_t off
, off_t secoff
);
1469 // Add an input section, for SHF_MERGE sections.
1471 add_input_section(Relobj
* object
, unsigned int shndx
)
1473 gold_assert(this->shndx_
== MERGE_DATA_SECTION_CODE
1474 || this->shndx_
== MERGE_STRING_SECTION_CODE
);
1475 return this->u2_
.posd
->add_input_section(object
, shndx
);
1478 // Given an input OBJECT, an input section index SHNDX within that
1479 // object, and an OFFSET relative to the start of that input
1480 // section, return whether or not the output address is known.
1481 // OUTPUT_SECTION_ADDRESS is the address of the output section
1482 // which this is a part of. If this function returns true, it
1483 // sets *POUTPUT to the output address.
1485 output_address(const Relobj
* object
, unsigned int shndx
, off_t offset
,
1486 uint64_t output_section_address
, uint64_t *poutput
) const;
1488 // Write out the data. This does nothing for an input section.
1490 write(Output_file
*);
1493 // Code values which appear in shndx_. If the value is not one of
1494 // these codes, it is the input section index in the object file.
1497 // An Output_section_data.
1498 OUTPUT_SECTION_CODE
= -1U,
1499 // An Output_section_data for an SHF_MERGE section with
1500 // SHF_STRINGS not set.
1501 MERGE_DATA_SECTION_CODE
= -2U,
1502 // An Output_section_data for an SHF_MERGE section with
1504 MERGE_STRING_SECTION_CODE
= -3U
1507 // Whether this is an input section.
1509 is_input_section() const
1511 return (this->shndx_
!= OUTPUT_SECTION_CODE
1512 && this->shndx_
!= MERGE_DATA_SECTION_CODE
1513 && this->shndx_
!= MERGE_STRING_SECTION_CODE
);
1516 // For an ordinary input section, this is the section index in the
1517 // input file. For an Output_section_data, this is
1518 // OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
1519 // MERGE_STRING_SECTION_CODE.
1520 unsigned int shndx_
;
1521 // The required alignment, stored as a power of 2.
1522 unsigned int p2align_
;
1525 // For an ordinary input section, the section size.
1527 // For OUTPUT_SECTION_CODE, this is not used. For
1528 // MERGE_DATA_SECTION_CODE or MERGE_STRING_SECTION_CODE, the
1534 // For an ordinary input section, the object which holds the
1537 // For OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
1538 // MERGE_STRING_SECTION_CODE, the data.
1539 Output_section_data
* posd
;
1543 typedef std::vector
<Input_section
> Input_section_list
;
1545 // Fill data. This is used to fill in data between input sections.
1546 // When we have to keep track of the input sections, we can use an
1547 // Output_data_const, but we don't want to have to keep track of
1548 // input sections just to implement fills. For a fill we record the
1549 // offset, and the actual data to be written out.
1553 Fill(off_t section_offset
, off_t length
)
1554 : section_offset_(section_offset
), length_(length
)
1557 // Return section offset.
1559 section_offset() const
1560 { return this->section_offset_
; }
1562 // Return fill length.
1565 { return this->length_
; }
1568 // The offset within the output section.
1569 off_t section_offset_
;
1570 // The length of the space to fill.
1574 typedef std::vector
<Fill
> Fill_list
;
1576 // Add a new output section by Input_section.
1578 add_output_section_data(Input_section
*);
1580 // Add an SHF_MERGE input section. Returns true if the section was
1583 add_merge_input_section(Relobj
* object
, unsigned int shndx
, uint64_t flags
,
1584 uint64_t entsize
, uint64_t addralign
);
1586 // Add an output SHF_MERGE section POSD to this output section.
1587 // IS_STRING indicates whether it is a SHF_STRINGS section, and
1588 // ENTSIZE is the entity size. This returns the entry added to
1591 add_output_merge_section(Output_section_data
* posd
, bool is_string
,
1594 // Most of these fields are only valid after layout.
1596 // The name of the section. This will point into a Stringpool.
1598 // The section address is in the parent class.
1599 // The section alignment.
1600 uint64_t addralign_
;
1601 // The section entry size.
1603 // The file offset is in the parent class.
1604 // Set the section link field to the index of this section.
1605 const Output_data
* link_section_
;
1606 // If link_section_ is NULL, this is the link field.
1608 // Set the section info field to the index of this section.
1609 const Output_data
* info_section_
;
1610 // If info_section_ is NULL, this is the section info field.
1612 // The section type.
1613 elfcpp::Elf_Word type_
;
1614 // The section flags.
1615 elfcpp::Elf_Xword flags_
;
1616 // The section index.
1617 unsigned int out_shndx_
;
1618 // If there is a STT_SECTION for this output section in the normal
1619 // symbol table, this is the symbol index. This starts out as zero.
1620 // It is initialized in Layout::finalize() to be the index, or -1U
1621 // if there isn't one.
1622 unsigned int symtab_index_
;
1623 // If there is a STT_SECTION for this output section in the dynamic
1624 // symbol table, this is the symbol index. This starts out as zero.
1625 // It is initialized in Layout::finalize() to be the index, or -1U
1626 // if there isn't one.
1627 unsigned int dynsym_index_
;
1628 // The input sections. This will be empty in cases where we don't
1629 // need to keep track of them.
1630 Input_section_list input_sections_
;
1631 // The offset of the first entry in input_sections_.
1632 off_t first_input_offset_
;
1633 // The fill data. This is separate from input_sections_ because we
1634 // often will need fill sections without needing to keep track of
1637 // Whether this output section needs a STT_SECTION symbol in the
1638 // normal symbol table. This will be true if there is a relocation
1640 bool needs_symtab_index_
: 1;
1641 // Whether this output section needs a STT_SECTION symbol in the
1642 // dynamic symbol table. This will be true if there is a dynamic
1643 // relocation which needs it.
1644 bool needs_dynsym_index_
: 1;
1645 // Whether the link field of this output section should point to the
1646 // normal symbol table.
1647 bool should_link_to_symtab_
: 1;
1648 // Whether the link field of this output section should point to the
1649 // dynamic symbol table.
1650 bool should_link_to_dynsym_
: 1;
1653 // An output segment. PT_LOAD segments are built from collections of
1654 // output sections. Other segments typically point within PT_LOAD
1655 // segments, and are built directly as needed.
1657 class Output_segment
1660 // Create an output segment, specifying the type and flags.
1661 Output_segment(elfcpp::Elf_Word
, elfcpp::Elf_Word
);
1663 // Return the virtual address.
1666 { return this->vaddr_
; }
1668 // Return the physical address.
1671 { return this->paddr_
; }
1673 // Return the segment type.
1676 { return this->type_
; }
1678 // Return the segment flags.
1681 { return this->flags_
; }
1683 // Return the memory size.
1686 { return this->memsz_
; }
1688 // Return the file size.
1691 { return this->filesz_
; }
1693 // Return the maximum alignment of the Output_data.
1697 // Add an Output_section to this segment.
1699 add_output_section(Output_section
* os
, elfcpp::Elf_Word seg_flags
)
1700 { this->add_output_section(os
, seg_flags
, false); }
1702 // Add an Output_section to the start of this segment.
1704 add_initial_output_section(Output_section
* os
, elfcpp::Elf_Word seg_flags
)
1705 { this->add_output_section(os
, seg_flags
, true); }
1707 // Add an Output_data (which is not an Output_section) to the start
1710 add_initial_output_data(Output_data
*);
1712 // Set the address of the segment to ADDR and the offset to *POFF
1713 // (aligned if necessary), and set the addresses and offsets of all
1714 // contained output sections accordingly. Set the section indexes
1715 // of all contained output sections starting with *PSHNDX. Return
1716 // the address of the immediately following segment. Update *POFF
1717 // and *PSHNDX. This should only be called for a PT_LOAD segment.
1719 set_section_addresses(uint64_t addr
, off_t
* poff
, unsigned int* pshndx
);
1721 // Set the minimum alignment of this segment. This may be adjusted
1722 // upward based on the section alignments.
1724 set_minimum_addralign(uint64_t align
)
1726 gold_assert(!this->is_align_known_
);
1727 this->align_
= align
;
1730 // Set the offset of this segment based on the section. This should
1731 // only be called for a non-PT_LOAD segment.
1735 // Return the number of output sections.
1737 output_section_count() const;
1739 // Write the segment header into *OPHDR.
1740 template<int size
, bool big_endian
>
1742 write_header(elfcpp::Phdr_write
<size
, big_endian
>*);
1744 // Write the section headers of associated sections into V.
1745 template<int size
, bool big_endian
>
1747 write_section_headers(const Layout
*, const Stringpool
*, unsigned char* v
,
1748 unsigned int* pshndx ACCEPT_SIZE_ENDIAN
) const;
1751 Output_segment(const Output_segment
&);
1752 Output_segment
& operator=(const Output_segment
&);
1754 typedef std::list
<Output_data
*> Output_data_list
;
1756 // Add an Output_section to this segment, specifying front or back.
1758 add_output_section(Output_section
*, elfcpp::Elf_Word seg_flags
,
1761 // Find the maximum alignment in an Output_data_list.
1763 maximum_alignment(const Output_data_list
*);
1765 // Set the section addresses in an Output_data_list.
1767 set_section_list_addresses(Output_data_list
*, uint64_t addr
, off_t
* poff
,
1768 unsigned int* pshndx
);
1770 // Return the number of Output_sections in an Output_data_list.
1772 output_section_count_list(const Output_data_list
*) const;
1774 // Write the section headers in the list into V.
1775 template<int size
, bool big_endian
>
1777 write_section_headers_list(const Layout
*, const Stringpool
*,
1778 const Output_data_list
*, unsigned char* v
,
1779 unsigned int* pshdx ACCEPT_SIZE_ENDIAN
) const;
1781 // The list of output data with contents attached to this segment.
1782 Output_data_list output_data_
;
1783 // The list of output data without contents attached to this segment.
1784 Output_data_list output_bss_
;
1785 // The segment virtual address.
1787 // The segment physical address.
1789 // The size of the segment in memory.
1791 // The segment alignment. The is_align_known_ field indicates
1792 // whether this has been finalized. It can be set to a minimum
1793 // value before it is finalized.
1795 // The offset of the segment data within the file.
1797 // The size of the segment data in the file.
1799 // The segment type;
1800 elfcpp::Elf_Word type_
;
1801 // The segment flags.
1802 elfcpp::Elf_Word flags_
;
1803 // Whether we have finalized align_.
1804 bool is_align_known_
;
1807 // This class represents the output file.
1812 Output_file(const General_options
& options
, Target
*);
1814 // Get a pointer to the target.
1817 { return this->target_
; }
1819 // Open the output file. FILE_SIZE is the final size of the file.
1821 open(off_t file_size
);
1823 // Close the output file and make sure there are no error.
1827 // We currently always use mmap which makes the view handling quite
1828 // simple. In the future we may support other approaches.
1830 // Write data to the output file.
1832 write(off_t offset
, const void* data
, off_t len
)
1833 { memcpy(this->base_
+ offset
, data
, len
); }
1835 // Get a buffer to use to write to the file, given the offset into
1836 // the file and the size.
1838 get_output_view(off_t start
, off_t size
)
1840 gold_assert(start
>= 0 && size
>= 0 && start
+ size
<= this->file_size_
);
1841 return this->base_
+ start
;
1844 // VIEW must have been returned by get_output_view. Write the
1845 // buffer to the file, passing in the offset and the size.
1847 write_output_view(off_t
, off_t
, unsigned char*)
1852 const General_options
& options_
;
1861 // Base of file mapped into memory.
1862 unsigned char* base_
;
1865 } // End namespace gold.
1867 #endif // !defined(GOLD_OUTPUT_H)