1 // inremental.cc -- incremental linking support for gold
3 // Copyright 2009, 2010 Free Software Foundation, Inc.
4 // Written by Mikolaj Zalewski <mikolajz@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.
26 #include "libiberty.h"
32 #include "incremental.h"
36 #include "target-select.h"
43 // Version information. Will change frequently during the development, later
44 // we could think about backward (and forward?) compatibility.
45 const unsigned int INCREMENTAL_LINK_VERSION
= 1;
47 // This class manages the .gnu_incremental_inputs section, which holds
48 // the header information, a directory of input files, and separate
49 // entries for each input file.
51 template<int size
, bool big_endian
>
52 class Output_section_incremental_inputs
: public Output_section_data
55 Output_section_incremental_inputs(const Incremental_inputs
* inputs
,
56 const Symbol_table
* symtab
)
57 : Output_section_data(size
/ 8), inputs_(inputs
), symtab_(symtab
)
61 // This is called to update the section size prior to assigning
62 // the address and file offset.
65 { this->set_final_data_size(); }
67 // Set the final data size.
69 set_final_data_size();
71 // Write the data to the file.
73 do_write(Output_file
*);
75 // Write to a map file.
77 do_print_to_mapfile(Mapfile
* mapfile
) const
78 { mapfile
->print_output_data(this, _("** incremental_inputs")); }
81 // Write the section header.
83 write_header(unsigned char* pov
, unsigned int input_file_count
,
84 section_offset_type command_line_offset
);
86 // Write the input file entries.
88 write_input_files(unsigned char* oview
, unsigned char* pov
,
91 // Write the supplemental information blocks.
93 write_info_blocks(unsigned char* oview
, unsigned char* pov
,
94 Stringpool
* strtab
, unsigned int* global_syms
,
95 unsigned int global_sym_count
);
97 // Write the contents of the .gnu_incremental_symtab section.
99 write_symtab(unsigned char* pov
, unsigned int* global_syms
,
100 unsigned int global_sym_count
);
102 // Write the contents of the .gnu_incremental_got_plt section.
104 write_got_plt(unsigned char* pov
, off_t view_size
);
106 // Typedefs for writing the data to the output sections.
107 typedef elfcpp::Swap
<size
, big_endian
> Swap
;
108 typedef elfcpp::Swap
<16, big_endian
> Swap16
;
109 typedef elfcpp::Swap
<32, big_endian
> Swap32
;
110 typedef elfcpp::Swap
<64, big_endian
> Swap64
;
112 // Sizes of various structures.
113 static const int sizeof_addr
= size
/ 8;
114 static const int header_size
= 16;
115 static const int input_entry_size
= 24;
117 // The Incremental_inputs object.
118 const Incremental_inputs
* inputs_
;
121 const Symbol_table
* symtab_
;
124 // Inform the user why we don't do an incremental link. Not called in
125 // the obvious case of missing output file. TODO: Is this helpful?
128 vexplain_no_incremental(const char* format
, va_list args
)
131 if (vasprintf(&buf
, format
, args
) < 0)
133 gold_info(_("the link might take longer: "
134 "cannot perform incremental link: %s"), buf
);
139 explain_no_incremental(const char* format
, ...)
142 va_start(args
, format
);
143 vexplain_no_incremental(format
, args
);
150 Incremental_binary::error(const char* format
, ...) const
153 va_start(args
, format
);
154 // Current code only checks if the file can be used for incremental linking,
155 // so errors shouldn't fail the build, but only result in a fallback to a
157 // TODO: when we implement incremental editing of the file, we may need a
158 // flag that will cause errors to be treated seriously.
159 vexplain_no_incremental(format
, args
);
163 // Find the .gnu_incremental_inputs section and related sections.
165 template<int size
, bool big_endian
>
167 Sized_incremental_binary
<size
, big_endian
>::find_incremental_inputs_sections(
168 unsigned int* p_inputs_shndx
,
169 unsigned int* p_symtab_shndx
,
170 unsigned int* p_relocs_shndx
,
171 unsigned int* p_got_plt_shndx
,
172 unsigned int* p_strtab_shndx
)
174 unsigned int inputs_shndx
=
175 this->elf_file_
.find_section_by_type(elfcpp::SHT_GNU_INCREMENTAL_INPUTS
);
176 if (inputs_shndx
== elfcpp::SHN_UNDEF
) // Not found.
179 unsigned int symtab_shndx
=
180 this->elf_file_
.find_section_by_type(elfcpp::SHT_GNU_INCREMENTAL_SYMTAB
);
181 if (symtab_shndx
== elfcpp::SHN_UNDEF
) // Not found.
183 if (this->elf_file_
.section_link(symtab_shndx
) != inputs_shndx
)
186 unsigned int relocs_shndx
=
187 this->elf_file_
.find_section_by_type(elfcpp::SHT_GNU_INCREMENTAL_RELOCS
);
188 if (relocs_shndx
== elfcpp::SHN_UNDEF
) // Not found.
190 if (this->elf_file_
.section_link(relocs_shndx
) != inputs_shndx
)
193 unsigned int got_plt_shndx
=
194 this->elf_file_
.find_section_by_type(elfcpp::SHT_GNU_INCREMENTAL_GOT_PLT
);
195 if (got_plt_shndx
== elfcpp::SHN_UNDEF
) // Not found.
197 if (this->elf_file_
.section_link(got_plt_shndx
) != inputs_shndx
)
200 unsigned int strtab_shndx
= this->elf_file_
.section_link(inputs_shndx
);
201 if (strtab_shndx
== elfcpp::SHN_UNDEF
202 || strtab_shndx
> this->elf_file_
.shnum()
203 || this->elf_file_
.section_type(strtab_shndx
) != elfcpp::SHT_STRTAB
)
206 if (p_inputs_shndx
!= NULL
)
207 *p_inputs_shndx
= inputs_shndx
;
208 if (p_symtab_shndx
!= NULL
)
209 *p_symtab_shndx
= symtab_shndx
;
210 if (p_relocs_shndx
!= NULL
)
211 *p_relocs_shndx
= relocs_shndx
;
212 if (p_got_plt_shndx
!= NULL
)
213 *p_got_plt_shndx
= got_plt_shndx
;
214 if (p_strtab_shndx
!= NULL
)
215 *p_strtab_shndx
= strtab_shndx
;
219 // Set up the readers into the incremental info sections.
221 template<int size
, bool big_endian
>
223 Sized_incremental_binary
<size
, big_endian
>::setup_readers()
225 unsigned int inputs_shndx
;
226 unsigned int symtab_shndx
;
227 unsigned int relocs_shndx
;
228 unsigned int got_plt_shndx
;
229 unsigned int strtab_shndx
;
231 if (!this->find_incremental_inputs_sections(&inputs_shndx
, &symtab_shndx
,
232 &relocs_shndx
, &got_plt_shndx
,
236 Location
inputs_location(this->elf_file_
.section_contents(inputs_shndx
));
237 Location
symtab_location(this->elf_file_
.section_contents(symtab_shndx
));
238 Location
relocs_location(this->elf_file_
.section_contents(relocs_shndx
));
239 Location
got_plt_location(this->elf_file_
.section_contents(got_plt_shndx
));
240 Location
strtab_location(this->elf_file_
.section_contents(strtab_shndx
));
242 View inputs_view
= this->view(inputs_location
);
243 View symtab_view
= this->view(symtab_location
);
244 View relocs_view
= this->view(relocs_location
);
245 View got_plt_view
= this->view(got_plt_location
);
246 View strtab_view
= this->view(strtab_location
);
248 elfcpp::Elf_strtab
strtab(strtab_view
.data(), strtab_location
.data_size
);
250 this->inputs_reader_
=
251 Incremental_inputs_reader
<size
, big_endian
>(inputs_view
.data(), strtab
);
252 this->symtab_reader_
=
253 Incremental_symtab_reader
<big_endian
>(symtab_view
.data(),
254 symtab_location
.data_size
);
255 this->relocs_reader_
=
256 Incremental_relocs_reader
<size
, big_endian
>(relocs_view
.data(),
257 relocs_location
.data_size
);
258 this->got_plt_reader_
=
259 Incremental_got_plt_reader
<big_endian
>(got_plt_view
.data());
261 // Find the main symbol table.
262 unsigned int main_symtab_shndx
=
263 this->elf_file_
.find_section_by_type(elfcpp::SHT_SYMTAB
);
264 gold_assert(main_symtab_shndx
!= elfcpp::SHN_UNDEF
);
265 this->main_symtab_loc_
= this->elf_file_
.section_contents(main_symtab_shndx
);
267 // Find the main symbol string table.
268 unsigned int main_strtab_shndx
=
269 this->elf_file_
.section_link(main_symtab_shndx
);
270 gold_assert(main_strtab_shndx
!= elfcpp::SHN_UNDEF
271 && main_strtab_shndx
< this->elf_file_
.shnum());
272 this->main_strtab_loc_
= this->elf_file_
.section_contents(main_strtab_shndx
);
274 // Walk the list of input files (a) to setup an Input_reader for each
275 // input file, and (b) to record maps of files added from archive
276 // libraries and scripts.
277 Incremental_inputs_reader
<size
, big_endian
>& inputs
= this->inputs_reader_
;
278 unsigned int count
= inputs
.input_file_count();
279 this->input_objects_
.resize(count
);
280 this->input_entry_readers_
.reserve(count
);
281 this->library_map_
.resize(count
);
282 this->script_map_
.resize(count
);
283 for (unsigned int i
= 0; i
< count
; i
++)
285 Input_entry_reader input_file
= inputs
.input_file(i
);
286 this->input_entry_readers_
.push_back(Sized_input_reader(input_file
));
287 switch (input_file
.type())
289 case INCREMENTAL_INPUT_OBJECT
:
290 case INCREMENTAL_INPUT_ARCHIVE_MEMBER
:
291 case INCREMENTAL_INPUT_SHARED_LIBRARY
:
292 // No special treatment necessary.
294 case INCREMENTAL_INPUT_ARCHIVE
:
296 Incremental_library
* lib
=
297 new Incremental_library(input_file
.filename(), i
,
298 &this->input_entry_readers_
[i
]);
299 this->library_map_
[i
] = lib
;
300 unsigned int member_count
= input_file
.get_member_count();
301 for (unsigned int j
= 0; j
< member_count
; j
++)
303 int member_offset
= input_file
.get_member_offset(j
);
304 int member_index
= inputs
.input_file_index(member_offset
);
305 this->library_map_
[member_index
] = lib
;
309 case INCREMENTAL_INPUT_SCRIPT
:
311 Script_info
* script
= new Script_info(input_file
.filename());
312 this->script_map_
[i
] = script
;
313 unsigned int object_count
= input_file
.get_object_count();
314 for (unsigned int j
= 0; j
< object_count
; j
++)
316 int object_offset
= input_file
.get_object_offset(j
);
317 int object_index
= inputs
.input_file_index(object_offset
);
318 this->script_map_
[object_index
] = script
;
327 // Initialize the map of global symbols.
328 unsigned int nglobals
= this->symtab_reader_
.symbol_count();
329 this->symbol_map_
.resize(nglobals
);
331 this->has_incremental_info_
= true;
334 // Walk the list of input files given on the command line, and build
335 // a direct map of file index to the corresponding input argument.
338 check_input_args(std::vector
<const Input_argument
*>& input_args_map
,
339 Input_arguments::const_iterator begin
,
340 Input_arguments::const_iterator end
)
342 for (Input_arguments::const_iterator p
= begin
;
348 const Input_file_group
* group
= p
->group();
349 check_input_args(input_args_map
, group
->begin(), group
->end());
351 else if (p
->is_lib())
353 const Input_file_lib
* lib
= p
->lib();
354 check_input_args(input_args_map
, lib
->begin(), lib
->end());
358 gold_assert(p
->is_file());
359 unsigned int arg_serial
= p
->file().arg_serial();
362 gold_assert(arg_serial
<= input_args_map
.size());
363 gold_assert(input_args_map
[arg_serial
- 1] == 0);
364 input_args_map
[arg_serial
- 1] = &*p
;
370 // Determine whether an incremental link based on the existing output file
373 template<int size
, bool big_endian
>
375 Sized_incremental_binary
<size
, big_endian
>::do_check_inputs(
376 const Command_line
& cmdline
,
377 Incremental_inputs
* incremental_inputs
)
379 Incremental_inputs_reader
<size
, big_endian
>& inputs
= this->inputs_reader_
;
381 if (!this->has_incremental_info_
)
383 explain_no_incremental(_("no incremental data from previous build"));
387 if (inputs
.version() != INCREMENTAL_LINK_VERSION
)
389 explain_no_incremental(_("different version of incremental build data"));
393 if (incremental_inputs
->command_line() != inputs
.command_line())
395 explain_no_incremental(_("command line changed"));
399 // Walk the list of input files given on the command line, and build
400 // a direct map of argument serial numbers to the corresponding input
402 this->input_args_map_
.resize(cmdline
.number_of_input_files());
403 check_input_args(this->input_args_map_
, cmdline
.begin(), cmdline
.end());
405 // Walk the list of input files to check for conditions that prevent
406 // an incremental update link.
407 unsigned int count
= inputs
.input_file_count();
408 for (unsigned int i
= 0; i
< count
; i
++)
410 Input_entry_reader input_file
= inputs
.input_file(i
);
411 switch (input_file
.type())
413 case INCREMENTAL_INPUT_OBJECT
:
414 case INCREMENTAL_INPUT_ARCHIVE_MEMBER
:
415 case INCREMENTAL_INPUT_SHARED_LIBRARY
:
416 case INCREMENTAL_INPUT_ARCHIVE
:
417 // No special treatment necessary.
419 case INCREMENTAL_INPUT_SCRIPT
:
420 if (this->do_file_has_changed(i
))
422 explain_no_incremental(_("%s: script file changed"),
423 input_file
.filename());
435 // Return TRUE if input file N has changed since the last incremental link.
437 template<int size
, bool big_endian
>
439 Sized_incremental_binary
<size
, big_endian
>::do_file_has_changed(
440 unsigned int n
) const
442 Input_entry_reader input_file
= this->inputs_reader_
.input_file(n
);
443 Incremental_disposition disp
= INCREMENTAL_CHECK
;
444 const Input_argument
* input_argument
= this->get_input_argument(n
);
445 if (input_argument
!= NULL
)
446 disp
= input_argument
->file().options().incremental_disposition();
448 if (disp
!= INCREMENTAL_CHECK
)
449 return disp
== INCREMENTAL_CHANGED
;
451 const char* filename
= input_file
.filename();
452 Timespec old_mtime
= input_file
.get_mtime();
454 if (!get_mtime(filename
, &new_mtime
))
456 // If we can't open get the current modification time, assume it has
457 // changed. If the file doesn't exist, we'll issue an error when we
458 // try to open it later.
462 if (new_mtime
.seconds
> old_mtime
.seconds
)
464 if (new_mtime
.seconds
== old_mtime
.seconds
465 && new_mtime
.nanoseconds
> old_mtime
.nanoseconds
)
470 // Initialize the layout of the output file based on the existing
473 template<int size
, bool big_endian
>
475 Sized_incremental_binary
<size
, big_endian
>::do_init_layout(Layout
* layout
)
477 typedef elfcpp::Shdr
<size
, big_endian
> Shdr
;
478 const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
480 // Get views of the section headers and the section string table.
481 const off_t shoff
= this->elf_file_
.shoff();
482 const unsigned int shnum
= this->elf_file_
.shnum();
483 const unsigned int shstrndx
= this->elf_file_
.shstrndx();
484 Location
shdrs_location(shoff
, shnum
* shdr_size
);
485 Location
shstrndx_location(this->elf_file_
.section_contents(shstrndx
));
486 View shdrs_view
= this->view(shdrs_location
);
487 View shstrndx_view
= this->view(shstrndx_location
);
488 elfcpp::Elf_strtab
shstrtab(shstrndx_view
.data(),
489 shstrndx_location
.data_size
);
491 layout
->set_incremental_base(this);
493 // Initialize the layout.
494 this->section_map_
.resize(shnum
);
495 const unsigned char* pshdr
= shdrs_view
.data() + shdr_size
;
496 for (unsigned int i
= 1; i
< shnum
; i
++)
500 if (!shstrtab
.get_c_string(shdr
.get_sh_name(), &name
))
502 gold_debug(DEBUG_INCREMENTAL
,
503 "Output section: %2d %08lx %08lx %08lx %3d %s",
505 static_cast<long>(shdr
.get_sh_addr()),
506 static_cast<long>(shdr
.get_sh_offset()),
507 static_cast<long>(shdr
.get_sh_size()),
508 shdr
.get_sh_type(), name
? name
: "<null>");
509 this->section_map_
[i
] = layout
->init_fixed_output_section(name
, shdr
);
514 // Mark regions of the input file that must be kept unchanged.
516 template<int size
, bool big_endian
>
518 Sized_incremental_binary
<size
, big_endian
>::do_reserve_layout(
519 unsigned int input_file_index
)
521 Input_entry_reader input_file
=
522 this->inputs_reader_
.input_file(input_file_index
);
524 if (input_file
.type() == INCREMENTAL_INPUT_SHARED_LIBRARY
)
527 unsigned int shnum
= input_file
.get_input_section_count();
528 for (unsigned int i
= 0; i
< shnum
; i
++)
530 typename
Input_entry_reader::Input_section_info sect
=
531 input_file
.get_input_section(i
);
532 if (sect
.output_shndx
== 0 || sect
.sh_offset
== -1)
534 Output_section
* os
= this->section_map_
[sect
.output_shndx
];
535 gold_assert(os
!= NULL
);
536 os
->reserve(sect
.sh_offset
, sect
.sh_size
);
540 // Process the GOT and PLT entries from the existing output file.
542 template<int size
, bool big_endian
>
544 Sized_incremental_binary
<size
, big_endian
>::do_process_got_plt(
545 Symbol_table
* symtab
,
548 Incremental_got_plt_reader
<big_endian
> got_plt_reader(this->got_plt_reader());
549 Sized_target
<size
, big_endian
>* target
=
550 parameters
->sized_target
<size
, big_endian
>();
552 // Get the number of symbols in the main symbol table and in the
553 // incremental symbol table. The difference between the two counts
554 // is the index of the first forced-local or global symbol in the
555 // main symbol table.
556 unsigned int symtab_count
=
557 this->main_symtab_loc_
.data_size
/ elfcpp::Elf_sizes
<size
>::sym_size
;
558 unsigned int isym_count
= this->symtab_reader_
.symbol_count();
559 unsigned int first_global
= symtab_count
- isym_count
;
561 // Tell the target how big the GOT and PLT sections are.
562 unsigned int got_count
= got_plt_reader
.get_got_entry_count();
563 unsigned int plt_count
= got_plt_reader
.get_plt_entry_count();
564 Output_data_got
<size
, big_endian
>* got
=
565 target
->init_got_plt_for_update(symtab
, layout
, got_count
, plt_count
);
567 // Read the GOT entries from the base file and build the outgoing GOT.
568 for (unsigned int i
= 0; i
< got_count
; ++i
)
570 unsigned int got_type
= got_plt_reader
.get_got_type(i
);
571 if ((got_type
& 0x7f) == 0x7f)
573 // This is the second entry of a pair.
574 got
->reserve_slot(i
);
577 unsigned int symndx
= got_plt_reader
.get_got_symndx(i
);
580 // This is an entry for a local symbol. Ignore this entry if
581 // the object file was replaced.
582 unsigned int input_index
= got_plt_reader
.get_got_input_index(i
);
583 gold_debug(DEBUG_INCREMENTAL
,
584 "GOT entry %d, type %02x: (local symbol)",
586 Sized_relobj_incr
<size
, big_endian
>* obj
=
587 this->input_object(input_index
);
589 target
->reserve_local_got_entry(i
, obj
, symndx
, got_type
& 0x7f);
593 // This is an entry for a global symbol. GOT_DESC is the symbol
595 // FIXME: This should really be a fatal error (corrupt input).
596 gold_assert(symndx
>= first_global
&& symndx
< symtab_count
);
597 Symbol
* sym
= this->global_symbol(symndx
- first_global
);
598 gold_debug(DEBUG_INCREMENTAL
,
599 "GOT entry %d, type %02x: %s",
600 i
, got_type
, sym
->name());
601 target
->reserve_global_got_entry(i
, sym
, got_type
);
605 // Read the PLT entries from the base file and pass each to the target.
606 for (unsigned int i
= 0; i
< plt_count
; ++i
)
608 unsigned int plt_desc
= got_plt_reader
.get_plt_desc(i
);
609 // FIXME: This should really be a fatal error (corrupt input).
610 gold_assert(plt_desc
>= first_global
&& plt_desc
< symtab_count
);
611 Symbol
* sym
= this->global_symbol(plt_desc
- first_global
);
612 gold_debug(DEBUG_INCREMENTAL
,
615 target
->register_global_plt_entry(i
, sym
);
619 // Apply incremental relocations for symbols whose values have changed.
621 template<int size
, bool big_endian
>
623 Sized_incremental_binary
<size
, big_endian
>::do_apply_incremental_relocs(
624 const Symbol_table
* symtab
,
628 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
629 typedef typename
elfcpp::Elf_types
<size
>::Elf_Swxword Addend
;
630 Incremental_symtab_reader
<big_endian
> isymtab(this->symtab_reader());
631 Incremental_relocs_reader
<size
, big_endian
> irelocs(this->relocs_reader());
632 unsigned int nglobals
= isymtab
.symbol_count();
633 const unsigned int incr_reloc_size
= irelocs
.reloc_size
;
635 Relocate_info
<size
, big_endian
> relinfo
;
636 relinfo
.symtab
= symtab
;
637 relinfo
.layout
= layout
;
638 relinfo
.object
= NULL
;
639 relinfo
.reloc_shndx
= 0;
640 relinfo
.reloc_shdr
= NULL
;
641 relinfo
.data_shndx
= 0;
642 relinfo
.data_shdr
= NULL
;
644 Sized_target
<size
, big_endian
>* target
=
645 parameters
->sized_target
<size
, big_endian
>();
647 for (unsigned int i
= 0; i
< nglobals
; i
++)
649 const Symbol
* gsym
= this->global_symbol(i
);
651 // If the symbol is not referenced from any unchanged input files,
652 // we do not need to reapply any of its relocations.
656 // If the symbol is defined in an unchanged file, we do not need to
657 // reapply any of its relocations.
658 if (gsym
->source() == Symbol::FROM_OBJECT
659 && gsym
->object()->is_incremental())
662 gold_debug(DEBUG_INCREMENTAL
,
663 "Applying incremental relocations for global symbol %s [%d]",
666 // Follow the linked list of input symbol table entries for this symbol.
667 // We don't bother to figure out whether the symbol table entry belongs
668 // to a changed or unchanged file because it's easier just to apply all
669 // the relocations -- although we might scribble over an area that has
670 // been reallocated, we do this before copying any new data into the
672 unsigned int offset
= isymtab
.get_list_head(i
);
675 Incremental_global_symbol_reader
<big_endian
> sym_info
=
676 this->inputs_reader().global_symbol_reader_at_offset(offset
);
677 unsigned int r_base
= sym_info
.reloc_offset();
678 unsigned int r_count
= sym_info
.reloc_count();
680 // Apply each relocation for this symbol table entry.
681 for (unsigned int j
= 0; j
< r_count
;
682 ++j
, r_base
+= incr_reloc_size
)
684 unsigned int r_type
= irelocs
.get_r_type(r_base
);
685 unsigned int r_shndx
= irelocs
.get_r_shndx(r_base
);
686 Address r_offset
= irelocs
.get_r_offset(r_base
);
687 Addend r_addend
= irelocs
.get_r_addend(r_base
);
688 Output_section
* os
= this->output_section(r_shndx
);
689 Address address
= os
->address();
690 off_t section_offset
= os
->offset();
691 size_t view_size
= os
->data_size();
692 unsigned char* const view
= of
->get_output_view(section_offset
,
695 gold_debug(DEBUG_INCREMENTAL
,
696 " %08lx: %s + %d: type %d addend %ld",
697 (long)(section_offset
+ r_offset
),
703 target
->apply_relocation(&relinfo
, r_offset
, r_type
, r_addend
,
704 gsym
, view
, address
, view_size
);
706 // FIXME: Do something more efficient if write_output_view
707 // ever becomes more than a no-op.
708 of
->write_output_view(section_offset
, view_size
, view
);
710 offset
= sym_info
.next_offset();
715 // Get a view of the main symbol table and the symbol string table.
717 template<int size
, bool big_endian
>
719 Sized_incremental_binary
<size
, big_endian
>::get_symtab_view(
722 elfcpp::Elf_strtab
* strtab
)
724 *symtab_view
= this->view(this->main_symtab_loc_
);
725 *nsyms
= this->main_symtab_loc_
.data_size
/ elfcpp::Elf_sizes
<size
>::sym_size
;
727 View
strtab_view(this->view(this->main_strtab_loc_
));
728 *strtab
= elfcpp::Elf_strtab(strtab_view
.data(),
729 this->main_strtab_loc_
.data_size
);
735 // Create a Sized_incremental_binary object of the specified size and
736 // endianness. Fails if the target architecture is not supported.
738 template<int size
, bool big_endian
>
740 make_sized_incremental_binary(Output_file
* file
,
741 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
743 Target
* target
= select_target(ehdr
.get_e_machine(), size
, big_endian
,
744 ehdr
.get_e_ident()[elfcpp::EI_OSABI
],
745 ehdr
.get_e_ident()[elfcpp::EI_ABIVERSION
]);
748 explain_no_incremental(_("unsupported ELF machine number %d"),
749 ehdr
.get_e_machine());
753 if (!parameters
->target_valid())
754 set_parameters_target(target
);
755 else if (target
!= ¶meters
->target())
756 gold_error(_("%s: incompatible target"), file
->filename());
758 return new Sized_incremental_binary
<size
, big_endian
>(file
, ehdr
, target
);
761 } // End of anonymous namespace.
763 // Create an Incremental_binary object for FILE. Returns NULL is this is not
764 // possible, e.g. FILE is not an ELF file or has an unsupported target. FILE
768 open_incremental_binary(Output_file
* file
)
770 off_t filesize
= file
->filesize();
771 int want
= elfcpp::Elf_recognizer::max_header_size
;
775 const unsigned char* p
= file
->get_input_view(0, want
);
776 if (!elfcpp::Elf_recognizer::is_elf_file(p
, want
))
778 explain_no_incremental(_("output is not an ELF file."));
783 bool big_endian
= false;
785 if (!elfcpp::Elf_recognizer::is_valid_header(p
, want
, &size
, &big_endian
,
788 explain_no_incremental(error
.c_str());
792 Incremental_binary
* result
= NULL
;
797 #ifdef HAVE_TARGET_32_BIG
798 result
= make_sized_incremental_binary
<32, true>(
799 file
, elfcpp::Ehdr
<32, true>(p
));
801 explain_no_incremental(_("unsupported file: 32-bit, big-endian"));
806 #ifdef HAVE_TARGET_32_LITTLE
807 result
= make_sized_incremental_binary
<32, false>(
808 file
, elfcpp::Ehdr
<32, false>(p
));
810 explain_no_incremental(_("unsupported file: 32-bit, little-endian"));
818 #ifdef HAVE_TARGET_64_BIG
819 result
= make_sized_incremental_binary
<64, true>(
820 file
, elfcpp::Ehdr
<64, true>(p
));
822 explain_no_incremental(_("unsupported file: 64-bit, big-endian"));
827 #ifdef HAVE_TARGET_64_LITTLE
828 result
= make_sized_incremental_binary
<64, false>(
829 file
, elfcpp::Ehdr
<64, false>(p
));
831 explain_no_incremental(_("unsupported file: 64-bit, little-endian"));
841 // Class Incremental_inputs.
843 // Add the command line to the string table, setting
844 // command_line_key_. In incremental builds, the command line is
845 // stored in .gnu_incremental_inputs so that the next linker run can
846 // check if the command line options didn't change.
849 Incremental_inputs::report_command_line(int argc
, const char* const* argv
)
851 // Always store 'gold' as argv[0] to avoid a full relink if the user used a
852 // different path to the linker.
853 std::string
args("gold");
854 // Copied from collect_argv in main.cc.
855 for (int i
= 1; i
< argc
; ++i
)
857 // Adding/removing these options should not result in a full relink.
858 if (strcmp(argv
[i
], "--incremental") == 0
859 || strcmp(argv
[i
], "--incremental-full") == 0
860 || strcmp(argv
[i
], "--incremental-update") == 0
861 || strcmp(argv
[i
], "--incremental-changed") == 0
862 || strcmp(argv
[i
], "--incremental-unchanged") == 0
863 || strcmp(argv
[i
], "--incremental-unknown") == 0
864 || is_prefix_of("--debug=", argv
[i
]))
868 // Now append argv[i], but with all single-quotes escaped
869 const char* argpos
= argv
[i
];
872 const int len
= strcspn(argpos
, "'");
873 args
.append(argpos
, len
);
874 if (argpos
[len
] == '\0')
876 args
.append("'\"'\"'");
882 this->command_line_
= args
;
883 this->strtab_
->add(this->command_line_
.c_str(), false,
884 &this->command_line_key_
);
887 // Record the input archive file ARCHIVE. This is called by the
888 // Add_archive_symbols task before determining which archive members
889 // to include. We create the Incremental_archive_entry here and
890 // attach it to the Archive, but we do not add it to the list of
891 // input objects until report_archive_end is called.
894 Incremental_inputs::report_archive_begin(Library_base
* arch
,
895 unsigned int arg_serial
,
896 Script_info
* script_info
)
898 Stringpool::Key filename_key
;
899 Timespec mtime
= arch
->get_mtime();
901 // For a file loaded from a script, don't record its argument serial number.
902 if (script_info
!= NULL
)
905 this->strtab_
->add(arch
->filename().c_str(), false, &filename_key
);
906 Incremental_archive_entry
* entry
=
907 new Incremental_archive_entry(filename_key
, arg_serial
, mtime
);
908 arch
->set_incremental_info(entry
);
910 if (script_info
!= NULL
)
912 Incremental_script_entry
* script_entry
= script_info
->incremental_info();
913 gold_assert(script_entry
!= NULL
);
914 script_entry
->add_object(entry
);
918 // Visitor class for processing the unused global symbols in a library.
919 // An instance of this class is passed to the library's
920 // for_all_unused_symbols() iterator, which will call the visit()
921 // function for each global symbol defined in each unused library
922 // member. We add those symbol names to the incremental info for the
925 class Unused_symbol_visitor
: public Library_base::Symbol_visitor_base
928 Unused_symbol_visitor(Incremental_archive_entry
* entry
, Stringpool
* strtab
)
929 : entry_(entry
), strtab_(strtab
)
933 visit(const char* sym
)
935 Stringpool::Key symbol_key
;
936 this->strtab_
->add(sym
, true, &symbol_key
);
937 this->entry_
->add_unused_global_symbol(symbol_key
);
941 Incremental_archive_entry
* entry_
;
945 // Finish recording the input archive file ARCHIVE. This is called by the
946 // Add_archive_symbols task after determining which archive members
950 Incremental_inputs::report_archive_end(Library_base
* arch
)
952 Incremental_archive_entry
* entry
= arch
->incremental_info();
954 gold_assert(entry
!= NULL
);
955 this->inputs_
.push_back(entry
);
957 // Collect unused global symbols.
958 Unused_symbol_visitor
v(entry
, this->strtab_
);
959 arch
->for_all_unused_symbols(&v
);
962 // Record the input object file OBJ. If ARCH is not NULL, attach
963 // the object file to the archive. This is called by the
964 // Add_symbols task after finding out the type of the file.
967 Incremental_inputs::report_object(Object
* obj
, unsigned int arg_serial
,
968 Library_base
* arch
, Script_info
* script_info
)
970 Stringpool::Key filename_key
;
971 Timespec mtime
= obj
->get_mtime();
973 // For a file loaded from a script, don't record its argument serial number.
974 if (script_info
!= NULL
)
977 this->strtab_
->add(obj
->name().c_str(), false, &filename_key
);
978 Incremental_object_entry
* obj_entry
=
979 new Incremental_object_entry(filename_key
, obj
, arg_serial
, mtime
);
980 if (obj
->is_in_system_directory())
981 obj_entry
->set_is_in_system_directory();
982 this->inputs_
.push_back(obj_entry
);
986 Incremental_archive_entry
* arch_entry
= arch
->incremental_info();
987 gold_assert(arch_entry
!= NULL
);
988 arch_entry
->add_object(obj_entry
);
991 if (script_info
!= NULL
)
993 Incremental_script_entry
* script_entry
= script_info
->incremental_info();
994 gold_assert(script_entry
!= NULL
);
995 script_entry
->add_object(obj_entry
);
998 this->current_object_
= obj
;
999 this->current_object_entry_
= obj_entry
;
1002 // Record the input object file OBJ. If ARCH is not NULL, attach
1003 // the object file to the archive. This is called by the
1004 // Add_symbols task after finding out the type of the file.
1007 Incremental_inputs::report_input_section(Object
* obj
, unsigned int shndx
,
1008 const char* name
, off_t sh_size
)
1010 Stringpool::Key key
= 0;
1013 this->strtab_
->add(name
, true, &key
);
1015 gold_assert(obj
== this->current_object_
);
1016 this->current_object_entry_
->add_input_section(shndx
, key
, sh_size
);
1019 // Record that the input argument INPUT is a script SCRIPT. This is
1020 // called by read_script after parsing the script and reading the list
1021 // of inputs added by this script.
1024 Incremental_inputs::report_script(Script_info
* script
,
1025 unsigned int arg_serial
,
1028 Stringpool::Key filename_key
;
1030 this->strtab_
->add(script
->filename().c_str(), false, &filename_key
);
1031 Incremental_script_entry
* entry
=
1032 new Incremental_script_entry(filename_key
, arg_serial
, script
, mtime
);
1033 this->inputs_
.push_back(entry
);
1034 script
->set_incremental_info(entry
);
1037 // Finalize the incremental link information. Called from
1038 // Layout::finalize.
1041 Incremental_inputs::finalize()
1043 // Finalize the string table.
1044 this->strtab_
->set_string_offsets();
1047 // Create the .gnu_incremental_inputs, _symtab, and _relocs input sections.
1050 Incremental_inputs::create_data_sections(Symbol_table
* symtab
)
1052 switch (parameters
->size_and_endianness())
1054 #ifdef HAVE_TARGET_32_LITTLE
1055 case Parameters::TARGET_32_LITTLE
:
1056 this->inputs_section_
=
1057 new Output_section_incremental_inputs
<32, false>(this, symtab
);
1060 #ifdef HAVE_TARGET_32_BIG
1061 case Parameters::TARGET_32_BIG
:
1062 this->inputs_section_
=
1063 new Output_section_incremental_inputs
<32, true>(this, symtab
);
1066 #ifdef HAVE_TARGET_64_LITTLE
1067 case Parameters::TARGET_64_LITTLE
:
1068 this->inputs_section_
=
1069 new Output_section_incremental_inputs
<64, false>(this, symtab
);
1072 #ifdef HAVE_TARGET_64_BIG
1073 case Parameters::TARGET_64_BIG
:
1074 this->inputs_section_
=
1075 new Output_section_incremental_inputs
<64, true>(this, symtab
);
1081 this->symtab_section_
= new Output_data_space(4, "** incremental_symtab");
1082 this->relocs_section_
= new Output_data_space(4, "** incremental_relocs");
1083 this->got_plt_section_
= new Output_data_space(4, "** incremental_got_plt");
1086 // Return the sh_entsize value for the .gnu_incremental_relocs section.
1088 Incremental_inputs::relocs_entsize() const
1090 return 8 + 2 * parameters
->target().get_size() / 8;
1093 // Class Output_section_incremental_inputs.
1095 // Finalize the offsets for each input section and supplemental info block,
1096 // and set the final data size of the incremental output sections.
1098 template<int size
, bool big_endian
>
1100 Output_section_incremental_inputs
<size
, big_endian
>::set_final_data_size()
1102 const Incremental_inputs
* inputs
= this->inputs_
;
1103 const unsigned int sizeof_addr
= size
/ 8;
1104 const unsigned int rel_size
= 8 + 2 * sizeof_addr
;
1106 // Offset of each input entry.
1107 unsigned int input_offset
= this->header_size
;
1109 // Offset of each supplemental info block.
1110 unsigned int file_index
= 0;
1111 unsigned int info_offset
= this->header_size
;
1112 info_offset
+= this->input_entry_size
* inputs
->input_file_count();
1114 // Count each input file and its supplemental information block.
1115 for (Incremental_inputs::Input_list::const_iterator p
=
1116 inputs
->input_files().begin();
1117 p
!= inputs
->input_files().end();
1120 // Set the index and offset of the input file entry.
1121 (*p
)->set_offset(file_index
, input_offset
);
1123 input_offset
+= this->input_entry_size
;
1125 // Set the offset of the supplemental info block.
1126 switch ((*p
)->type())
1128 case INCREMENTAL_INPUT_SCRIPT
:
1130 Incremental_script_entry
*entry
= (*p
)->script_entry();
1131 gold_assert(entry
!= NULL
);
1132 (*p
)->set_info_offset(info_offset
);
1136 info_offset
+= (entry
->get_object_count() * 4);
1139 case INCREMENTAL_INPUT_OBJECT
:
1140 case INCREMENTAL_INPUT_ARCHIVE_MEMBER
:
1142 Incremental_object_entry
* entry
= (*p
)->object_entry();
1143 gold_assert(entry
!= NULL
);
1144 (*p
)->set_info_offset(info_offset
);
1145 // Input section count, global symbol count, local symbol offset,
1146 // local symbol count, first dynamic reloc, dynamic reloc count.
1148 // Each input section.
1149 info_offset
+= (entry
->get_input_section_count()
1150 * (8 + 2 * sizeof_addr
));
1151 // Each global symbol.
1152 const Object::Symbols
* syms
= entry
->object()->get_global_symbols();
1153 info_offset
+= syms
->size() * 20;
1156 case INCREMENTAL_INPUT_SHARED_LIBRARY
:
1158 Incremental_object_entry
* entry
= (*p
)->object_entry();
1159 gold_assert(entry
!= NULL
);
1160 (*p
)->set_info_offset(info_offset
);
1161 // Global symbol count.
1163 // Each global symbol.
1164 const Object::Symbols
* syms
= entry
->object()->get_global_symbols();
1165 gold_assert(syms
!= NULL
);
1166 unsigned int nsyms
= syms
->size();
1167 unsigned int nsyms_out
= 0;
1168 for (unsigned int i
= 0; i
< nsyms
; ++i
)
1170 const Symbol
* sym
= (*syms
)[i
];
1173 if (sym
->is_forwarder())
1174 sym
= this->symtab_
->resolve_forwards(sym
);
1175 if (sym
->symtab_index() != -1U)
1178 info_offset
+= nsyms_out
* 4;
1181 case INCREMENTAL_INPUT_ARCHIVE
:
1183 Incremental_archive_entry
* entry
= (*p
)->archive_entry();
1184 gold_assert(entry
!= NULL
);
1185 (*p
)->set_info_offset(info_offset
);
1186 // Member count + unused global symbol count.
1189 info_offset
+= (entry
->get_member_count() * 4);
1190 // Each global symbol.
1191 info_offset
+= (entry
->get_unused_global_symbol_count() * 4);
1199 this->set_data_size(info_offset
);
1201 // Set the size of the .gnu_incremental_symtab section.
1202 inputs
->symtab_section()->set_current_data_size(this->symtab_
->output_count()
1203 * sizeof(unsigned int));
1205 // Set the size of the .gnu_incremental_relocs section.
1206 inputs
->relocs_section()->set_current_data_size(inputs
->get_reloc_count()
1209 // Set the size of the .gnu_incremental_got_plt section.
1210 Sized_target
<size
, big_endian
>* target
=
1211 parameters
->sized_target
<size
, big_endian
>();
1212 unsigned int got_count
= target
->got_entry_count();
1213 unsigned int plt_count
= target
->plt_entry_count();
1214 unsigned int got_plt_size
= 8; // GOT entry count, PLT entry count.
1215 got_plt_size
= (got_plt_size
+ got_count
+ 3) & ~3; // GOT type array.
1216 got_plt_size
+= got_count
* 8 + plt_count
* 4; // GOT array, PLT array.
1217 inputs
->got_plt_section()->set_current_data_size(got_plt_size
);
1220 // Write the contents of the .gnu_incremental_inputs and
1221 // .gnu_incremental_symtab sections.
1223 template<int size
, bool big_endian
>
1225 Output_section_incremental_inputs
<size
, big_endian
>::do_write(Output_file
* of
)
1227 const Incremental_inputs
* inputs
= this->inputs_
;
1228 Stringpool
* strtab
= inputs
->get_stringpool();
1230 // Get a view into the .gnu_incremental_inputs section.
1231 const off_t off
= this->offset();
1232 const off_t oview_size
= this->data_size();
1233 unsigned char* const oview
= of
->get_output_view(off
, oview_size
);
1234 unsigned char* pov
= oview
;
1236 // Get a view into the .gnu_incremental_symtab section.
1237 const off_t symtab_off
= inputs
->symtab_section()->offset();
1238 const off_t symtab_size
= inputs
->symtab_section()->data_size();
1239 unsigned char* const symtab_view
= of
->get_output_view(symtab_off
,
1242 // Allocate an array of linked list heads for the .gnu_incremental_symtab
1243 // section. Each element corresponds to a global symbol in the output
1244 // symbol table, and points to the head of the linked list that threads
1245 // through the object file input entries. The value of each element
1246 // is the section-relative offset to a global symbol entry in a
1247 // supplemental information block.
1248 unsigned int global_sym_count
= this->symtab_
->output_count();
1249 unsigned int* global_syms
= new unsigned int[global_sym_count
];
1250 memset(global_syms
, 0, global_sym_count
* sizeof(unsigned int));
1252 // Write the section header.
1253 Stringpool::Key command_line_key
= inputs
->command_line_key();
1254 pov
= this->write_header(pov
, inputs
->input_file_count(),
1255 strtab
->get_offset_from_key(command_line_key
));
1257 // Write the list of input files.
1258 pov
= this->write_input_files(oview
, pov
, strtab
);
1260 // Write the supplemental information blocks for each input file.
1261 pov
= this->write_info_blocks(oview
, pov
, strtab
, global_syms
,
1264 gold_assert(pov
- oview
== oview_size
);
1266 // Write the .gnu_incremental_symtab section.
1267 gold_assert(global_sym_count
* 4 == symtab_size
);
1268 this->write_symtab(symtab_view
, global_syms
, global_sym_count
);
1270 delete[] global_syms
;
1272 // Write the .gnu_incremental_got_plt section.
1273 const off_t got_plt_off
= inputs
->got_plt_section()->offset();
1274 const off_t got_plt_size
= inputs
->got_plt_section()->data_size();
1275 unsigned char* const got_plt_view
= of
->get_output_view(got_plt_off
,
1277 this->write_got_plt(got_plt_view
, got_plt_size
);
1279 of
->write_output_view(off
, oview_size
, oview
);
1280 of
->write_output_view(symtab_off
, symtab_size
, symtab_view
);
1281 of
->write_output_view(got_plt_off
, got_plt_size
, got_plt_view
);
1284 // Write the section header: version, input file count, offset of command line
1285 // in the string table, and 4 bytes of padding.
1287 template<int size
, bool big_endian
>
1289 Output_section_incremental_inputs
<size
, big_endian
>::write_header(
1291 unsigned int input_file_count
,
1292 section_offset_type command_line_offset
)
1294 Swap32::writeval(pov
, INCREMENTAL_LINK_VERSION
);
1295 Swap32::writeval(pov
+ 4, input_file_count
);
1296 Swap32::writeval(pov
+ 8, command_line_offset
);
1297 Swap32::writeval(pov
+ 12, 0);
1298 return pov
+ this->header_size
;
1301 // Write the input file entries.
1303 template<int size
, bool big_endian
>
1305 Output_section_incremental_inputs
<size
, big_endian
>::write_input_files(
1306 unsigned char* oview
,
1310 const Incremental_inputs
* inputs
= this->inputs_
;
1312 for (Incremental_inputs::Input_list::const_iterator p
=
1313 inputs
->input_files().begin();
1314 p
!= inputs
->input_files().end();
1317 gold_assert(static_cast<unsigned int>(pov
- oview
) == (*p
)->get_offset());
1318 section_offset_type filename_offset
=
1319 strtab
->get_offset_from_key((*p
)->get_filename_key());
1320 const Timespec
& mtime
= (*p
)->get_mtime();
1321 unsigned int flags
= (*p
)->type();
1322 if ((*p
)->is_in_system_directory())
1323 flags
|= INCREMENTAL_INPUT_IN_SYSTEM_DIR
;
1324 Swap32::writeval(pov
, filename_offset
);
1325 Swap32::writeval(pov
+ 4, (*p
)->get_info_offset());
1326 Swap64::writeval(pov
+ 8, mtime
.seconds
);
1327 Swap32::writeval(pov
+ 16, mtime
.nanoseconds
);
1328 Swap16::writeval(pov
+ 20, flags
);
1329 Swap16::writeval(pov
+ 22, (*p
)->arg_serial());
1330 pov
+= this->input_entry_size
;
1335 // Write the supplemental information blocks.
1337 template<int size
, bool big_endian
>
1339 Output_section_incremental_inputs
<size
, big_endian
>::write_info_blocks(
1340 unsigned char* oview
,
1343 unsigned int* global_syms
,
1344 unsigned int global_sym_count
)
1346 const Incremental_inputs
* inputs
= this->inputs_
;
1347 unsigned int first_global_index
= this->symtab_
->first_global_index();
1349 for (Incremental_inputs::Input_list::const_iterator p
=
1350 inputs
->input_files().begin();
1351 p
!= inputs
->input_files().end();
1354 switch ((*p
)->type())
1356 case INCREMENTAL_INPUT_SCRIPT
:
1358 gold_assert(static_cast<unsigned int>(pov
- oview
)
1359 == (*p
)->get_info_offset());
1360 Incremental_script_entry
* entry
= (*p
)->script_entry();
1361 gold_assert(entry
!= NULL
);
1363 // Write the object count.
1364 unsigned int nobjects
= entry
->get_object_count();
1365 Swap32::writeval(pov
, nobjects
);
1368 // For each object, write the offset to its input file entry.
1369 for (unsigned int i
= 0; i
< nobjects
; ++i
)
1371 Incremental_input_entry
* obj
= entry
->get_object(i
);
1372 Swap32::writeval(pov
, obj
->get_offset());
1378 case INCREMENTAL_INPUT_OBJECT
:
1379 case INCREMENTAL_INPUT_ARCHIVE_MEMBER
:
1381 gold_assert(static_cast<unsigned int>(pov
- oview
)
1382 == (*p
)->get_info_offset());
1383 Incremental_object_entry
* entry
= (*p
)->object_entry();
1384 gold_assert(entry
!= NULL
);
1385 const Object
* obj
= entry
->object();
1386 const Relobj
* relobj
= static_cast<const Relobj
*>(obj
);
1387 const Object::Symbols
* syms
= obj
->get_global_symbols();
1388 // Write the input section count and global symbol count.
1389 unsigned int nsections
= entry
->get_input_section_count();
1390 unsigned int nsyms
= syms
->size();
1391 off_t locals_offset
= relobj
->local_symbol_offset();
1392 unsigned int nlocals
= relobj
->output_local_symbol_count();
1393 unsigned int first_dynrel
= relobj
->first_dyn_reloc();
1394 unsigned int ndynrel
= relobj
->dyn_reloc_count();
1395 Swap32::writeval(pov
, nsections
);
1396 Swap32::writeval(pov
+ 4, nsyms
);
1397 Swap32::writeval(pov
+ 8, static_cast<unsigned int>(locals_offset
));
1398 Swap32::writeval(pov
+ 12, nlocals
);
1399 Swap32::writeval(pov
+ 16, first_dynrel
);
1400 Swap32::writeval(pov
+ 20, ndynrel
);
1403 // Build a temporary array to map input section indexes
1404 // from the original object file index to the index in the
1405 // incremental info table.
1406 unsigned int* index_map
= new unsigned int[obj
->shnum()];
1407 memset(index_map
, 0, obj
->shnum() * sizeof(unsigned int));
1409 // For each input section, write the name, output section index,
1410 // offset within output section, and input section size.
1411 for (unsigned int i
= 0; i
< nsections
; i
++)
1413 unsigned int shndx
= entry
->get_input_section_index(i
);
1414 index_map
[shndx
] = i
+ 1;
1415 Stringpool::Key key
= entry
->get_input_section_name_key(i
);
1416 off_t name_offset
= 0;
1418 name_offset
= strtab
->get_offset_from_key(key
);
1420 off_t out_offset
= 0;
1422 Output_section
* os
= obj
->output_section(shndx
);
1425 out_shndx
= os
->out_shndx();
1426 out_offset
= obj
->output_section_offset(shndx
);
1427 sh_size
= entry
->get_input_section_size(i
);
1429 Swap32::writeval(pov
, name_offset
);
1430 Swap32::writeval(pov
+ 4, out_shndx
);
1431 Swap::writeval(pov
+ 8, out_offset
);
1432 Swap::writeval(pov
+ 8 + sizeof_addr
, sh_size
);
1433 pov
+= 8 + 2 * sizeof_addr
;
1436 // For each global symbol, write its associated relocations,
1437 // add it to the linked list of globals, then write the
1438 // supplemental information: global symbol table index,
1439 // input section index, linked list chain pointer, relocation
1440 // count, and offset to the relocations.
1441 for (unsigned int i
= 0; i
< nsyms
; i
++)
1443 const Symbol
* sym
= (*syms
)[i
];
1444 if (sym
->is_forwarder())
1445 sym
= this->symtab_
->resolve_forwards(sym
);
1446 unsigned int shndx
= 0;
1447 if (sym
->source() == Symbol::FROM_OBJECT
1448 && sym
->object() == obj
1449 && sym
->is_defined())
1452 unsigned int orig_shndx
= sym
->shndx(&is_ordinary
);
1454 shndx
= index_map
[orig_shndx
];
1456 unsigned int symtab_index
= sym
->symtab_index();
1457 unsigned int chain
= 0;
1458 unsigned int first_reloc
= 0;
1459 unsigned int nrelocs
= obj
->get_incremental_reloc_count(i
);
1462 gold_assert(symtab_index
!= -1U
1463 && (symtab_index
- first_global_index
1464 < global_sym_count
));
1465 first_reloc
= obj
->get_incremental_reloc_base(i
);
1466 chain
= global_syms
[symtab_index
- first_global_index
];
1467 global_syms
[symtab_index
- first_global_index
] =
1470 Swap32::writeval(pov
, symtab_index
);
1471 Swap32::writeval(pov
+ 4, shndx
);
1472 Swap32::writeval(pov
+ 8, chain
);
1473 Swap32::writeval(pov
+ 12, nrelocs
);
1474 Swap32::writeval(pov
+ 16, first_reloc
* 3 * sizeof_addr
);
1482 case INCREMENTAL_INPUT_SHARED_LIBRARY
:
1484 gold_assert(static_cast<unsigned int>(pov
- oview
)
1485 == (*p
)->get_info_offset());
1486 Incremental_object_entry
* entry
= (*p
)->object_entry();
1487 gold_assert(entry
!= NULL
);
1488 const Object
* obj
= entry
->object();
1489 const Object::Symbols
* syms
= obj
->get_global_symbols();
1491 // Skip the global symbol count for now.
1492 unsigned char* orig_pov
= pov
;
1495 // For each global symbol, write the global symbol table index.
1496 unsigned int nsyms
= syms
->size();
1497 unsigned int nsyms_out
= 0;
1498 for (unsigned int i
= 0; i
< nsyms
; i
++)
1500 const Symbol
* sym
= (*syms
)[i
];
1503 if (sym
->is_forwarder())
1504 sym
= this->symtab_
->resolve_forwards(sym
);
1505 if (sym
->symtab_index() == -1U)
1507 unsigned int def_flag
= 0;
1508 if (sym
->source() == Symbol::FROM_OBJECT
1509 && sym
->object() == obj
1510 && sym
->is_defined())
1511 def_flag
= 1U << 31;
1512 Swap32::writeval(pov
, sym
->symtab_index() | def_flag
);
1517 // Now write the global symbol count.
1518 Swap32::writeval(orig_pov
, nsyms_out
);
1522 case INCREMENTAL_INPUT_ARCHIVE
:
1524 gold_assert(static_cast<unsigned int>(pov
- oview
)
1525 == (*p
)->get_info_offset());
1526 Incremental_archive_entry
* entry
= (*p
)->archive_entry();
1527 gold_assert(entry
!= NULL
);
1529 // Write the member count and unused global symbol count.
1530 unsigned int nmembers
= entry
->get_member_count();
1531 unsigned int nsyms
= entry
->get_unused_global_symbol_count();
1532 Swap32::writeval(pov
, nmembers
);
1533 Swap32::writeval(pov
+ 4, nsyms
);
1536 // For each member, write the offset to its input file entry.
1537 for (unsigned int i
= 0; i
< nmembers
; ++i
)
1539 Incremental_object_entry
* member
= entry
->get_member(i
);
1540 Swap32::writeval(pov
, member
->get_offset());
1544 // For each global symbol, write the name offset.
1545 for (unsigned int i
= 0; i
< nsyms
; ++i
)
1547 Stringpool::Key key
= entry
->get_unused_global_symbol(i
);
1548 Swap32::writeval(pov
, strtab
->get_offset_from_key(key
));
1561 // Write the contents of the .gnu_incremental_symtab section.
1563 template<int size
, bool big_endian
>
1565 Output_section_incremental_inputs
<size
, big_endian
>::write_symtab(
1567 unsigned int* global_syms
,
1568 unsigned int global_sym_count
)
1570 for (unsigned int i
= 0; i
< global_sym_count
; ++i
)
1572 Swap32::writeval(pov
, global_syms
[i
]);
1577 // This struct holds the view information needed to write the
1578 // .gnu_incremental_got_plt section.
1580 struct Got_plt_view_info
1582 // Start of the GOT type array in the output view.
1583 unsigned char* got_type_p
;
1584 // Start of the GOT descriptor array in the output view.
1585 unsigned char* got_desc_p
;
1586 // Start of the PLT descriptor array in the output view.
1587 unsigned char* plt_desc_p
;
1588 // Number of GOT entries.
1589 unsigned int got_count
;
1590 // Number of PLT entries.
1591 unsigned int plt_count
;
1592 // Offset of the first non-reserved PLT entry (this is a target-dependent value).
1593 unsigned int first_plt_entry_offset
;
1594 // Size of a PLT entry (this is a target-dependent value).
1595 unsigned int plt_entry_size
;
1596 // Symbol index to write in the GOT descriptor array. For global symbols,
1597 // this is the global symbol table index; for local symbols, it is the
1598 // local symbol table index.
1599 unsigned int sym_index
;
1600 // Input file index to write in the GOT descriptor array. For global
1601 // symbols, this is 0; for local symbols, it is the index of the input
1602 // file entry in the .gnu_incremental_inputs section.
1603 unsigned int input_index
;
1606 // Functor class for processing a GOT offset list for local symbols.
1607 // Writes the GOT type and symbol index into the GOT type and descriptor
1608 // arrays in the output section.
1610 template<int size
, bool big_endian
>
1611 class Local_got_offset_visitor
: public Got_offset_list::Visitor
1614 Local_got_offset_visitor(struct Got_plt_view_info
& info
)
1619 visit(unsigned int got_type
, unsigned int got_offset
)
1621 unsigned int got_index
= got_offset
/ this->got_entry_size_
;
1622 gold_assert(got_index
< this->info_
.got_count
);
1623 // We can only handle GOT entry types in the range 0..0x7e
1624 // because we use a byte array to store them, and we use the
1625 // high bit to flag a local symbol.
1626 gold_assert(got_type
< 0x7f);
1627 this->info_
.got_type_p
[got_index
] = got_type
| 0x80;
1628 unsigned char* pov
= this->info_
.got_desc_p
+ got_index
* 8;
1629 elfcpp::Swap
<32, big_endian
>::writeval(pov
, this->info_
.sym_index
);
1630 elfcpp::Swap
<32, big_endian
>::writeval(pov
+ 4, this->info_
.input_index
);
1634 static const unsigned int got_entry_size_
= size
/ 8;
1635 struct Got_plt_view_info
& info_
;
1638 // Functor class for processing a GOT offset list. Writes the GOT type
1639 // and symbol index into the GOT type and descriptor arrays in the output
1642 template<int size
, bool big_endian
>
1643 class Global_got_offset_visitor
: public Got_offset_list::Visitor
1646 Global_got_offset_visitor(struct Got_plt_view_info
& info
)
1651 visit(unsigned int got_type
, unsigned int got_offset
)
1653 unsigned int got_index
= got_offset
/ this->got_entry_size_
;
1654 gold_assert(got_index
< this->info_
.got_count
);
1655 // We can only handle GOT entry types in the range 0..0x7e
1656 // because we use a byte array to store them, and we use the
1657 // high bit to flag a local symbol.
1658 gold_assert(got_type
< 0x7f);
1659 this->info_
.got_type_p
[got_index
] = got_type
;
1660 unsigned char* pov
= this->info_
.got_desc_p
+ got_index
* 8;
1661 elfcpp::Swap
<32, big_endian
>::writeval(pov
, this->info_
.sym_index
);
1662 elfcpp::Swap
<32, big_endian
>::writeval(pov
+ 4, 0);
1666 static const unsigned int got_entry_size_
= size
/ 8;
1667 struct Got_plt_view_info
& info_
;
1670 // Functor class for processing the global symbol table. Processes the
1671 // GOT offset list for the symbol, and writes the symbol table index
1672 // into the PLT descriptor array in the output section.
1674 template<int size
, bool big_endian
>
1675 class Global_symbol_visitor_got_plt
1678 Global_symbol_visitor_got_plt(struct Got_plt_view_info
& info
)
1683 operator()(const Sized_symbol
<size
>* sym
)
1685 typedef Global_got_offset_visitor
<size
, big_endian
> Got_visitor
;
1686 const Got_offset_list
* got_offsets
= sym
->got_offset_list();
1687 if (got_offsets
!= NULL
)
1689 this->info_
.sym_index
= sym
->symtab_index();
1690 this->info_
.input_index
= 0;
1691 Got_visitor
v(this->info_
);
1692 got_offsets
->for_all_got_offsets(&v
);
1694 if (sym
->has_plt_offset())
1696 unsigned int plt_index
=
1697 ((sym
->plt_offset() - this->info_
.first_plt_entry_offset
)
1698 / this->info_
.plt_entry_size
);
1699 gold_assert(plt_index
< this->info_
.plt_count
);
1700 unsigned char* pov
= this->info_
.plt_desc_p
+ plt_index
* 4;
1701 elfcpp::Swap
<32, big_endian
>::writeval(pov
, sym
->symtab_index());
1706 struct Got_plt_view_info
& info_
;
1709 // Write the contents of the .gnu_incremental_got_plt section.
1711 template<int size
, bool big_endian
>
1713 Output_section_incremental_inputs
<size
, big_endian
>::write_got_plt(
1717 Sized_target
<size
, big_endian
>* target
=
1718 parameters
->sized_target
<size
, big_endian
>();
1720 // Set up the view information for the functors.
1721 struct Got_plt_view_info view_info
;
1722 view_info
.got_count
= target
->got_entry_count();
1723 view_info
.plt_count
= target
->plt_entry_count();
1724 view_info
.first_plt_entry_offset
= target
->first_plt_entry_offset();
1725 view_info
.plt_entry_size
= target
->plt_entry_size();
1726 view_info
.got_type_p
= pov
+ 8;
1727 view_info
.got_desc_p
= (view_info
.got_type_p
1728 + ((view_info
.got_count
+ 3) & ~3));
1729 view_info
.plt_desc_p
= view_info
.got_desc_p
+ view_info
.got_count
* 8;
1731 gold_assert(pov
+ view_size
==
1732 view_info
.plt_desc_p
+ view_info
.plt_count
* 4);
1734 // Write the section header.
1735 Swap32::writeval(pov
, view_info
.got_count
);
1736 Swap32::writeval(pov
+ 4, view_info
.plt_count
);
1738 // Initialize the GOT type array to 0xff (reserved).
1739 memset(view_info
.got_type_p
, 0xff, view_info
.got_count
);
1741 // Write the incremental GOT descriptors for local symbols.
1742 typedef Local_got_offset_visitor
<size
, big_endian
> Got_visitor
;
1743 for (Incremental_inputs::Input_list::const_iterator p
=
1744 this->inputs_
->input_files().begin();
1745 p
!= this->inputs_
->input_files().end();
1748 if ((*p
)->type() != INCREMENTAL_INPUT_OBJECT
1749 && (*p
)->type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER
)
1751 Incremental_object_entry
* entry
= (*p
)->object_entry();
1752 gold_assert(entry
!= NULL
);
1753 const Object
* obj
= entry
->object();
1754 gold_assert(obj
!= NULL
);
1755 view_info
.input_index
= (*p
)->get_file_index();
1756 Got_visitor
v(view_info
);
1757 obj
->for_all_local_got_entries(&v
);
1760 // Write the incremental GOT and PLT descriptors for global symbols.
1761 typedef Global_symbol_visitor_got_plt
<size
, big_endian
> Symbol_visitor
;
1762 symtab_
->for_all_symbols
<size
, Symbol_visitor
>(Symbol_visitor(view_info
));
1765 // Class Sized_relobj_incr. Most of these methods are not used for
1766 // Incremental objects, but are required to be implemented by the
1767 // base class Object.
1769 template<int size
, bool big_endian
>
1770 Sized_relobj_incr
<size
, big_endian
>::Sized_relobj_incr(
1771 const std::string
& name
,
1772 Sized_incremental_binary
<size
, big_endian
>* ibase
,
1773 unsigned int input_file_index
)
1774 : Sized_relobj
<size
, big_endian
>(name
, NULL
), ibase_(ibase
),
1775 input_file_index_(input_file_index
),
1776 input_reader_(ibase
->inputs_reader().input_file(input_file_index
)),
1777 local_symbol_count_(0), output_local_dynsym_count_(0),
1778 local_symbol_index_(0), local_symbol_offset_(0), local_dynsym_offset_(0),
1779 symbols_(), incr_reloc_offset_(-1U), incr_reloc_count_(0),
1780 incr_reloc_output_index_(0), incr_relocs_(NULL
), local_symbols_()
1782 if (this->input_reader_
.is_in_system_directory())
1783 this->set_is_in_system_directory();
1784 const unsigned int shnum
= this->input_reader_
.get_input_section_count() + 1;
1785 this->set_shnum(shnum
);
1786 ibase
->set_input_object(input_file_index
, this);
1789 // Read the symbols.
1791 template<int size
, bool big_endian
>
1793 Sized_relobj_incr
<size
, big_endian
>::do_read_symbols(Read_symbols_data
*)
1798 // Lay out the input sections.
1800 template<int size
, bool big_endian
>
1802 Sized_relobj_incr
<size
, big_endian
>::do_layout(
1807 const unsigned int shnum
= this->shnum();
1808 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
1809 gold_assert(incremental_inputs
!= NULL
);
1810 Output_sections
& out_sections(this->output_sections());
1811 out_sections
.resize(shnum
);
1812 this->section_offsets().resize(shnum
);
1813 for (unsigned int i
= 1; i
< shnum
; i
++)
1815 typename
Input_entry_reader::Input_section_info sect
=
1816 this->input_reader_
.get_input_section(i
- 1);
1817 // Add the section to the incremental inputs layout.
1818 incremental_inputs
->report_input_section(this, i
, sect
.name
,
1820 if (sect
.output_shndx
== 0 || sect
.sh_offset
== -1)
1822 Output_section
* os
= this->ibase_
->output_section(sect
.output_shndx
);
1823 gold_assert(os
!= NULL
);
1824 out_sections
[i
] = os
;
1825 this->section_offsets()[i
] = static_cast<Address
>(sect
.sh_offset
);
1829 // Layout sections whose layout was deferred while waiting for
1830 // input files from a plugin.
1831 template<int size
, bool big_endian
>
1833 Sized_relobj_incr
<size
, big_endian
>::do_layout_deferred_sections(Layout
*)
1837 // Add the symbols to the symbol table.
1839 template<int size
, bool big_endian
>
1841 Sized_relobj_incr
<size
, big_endian
>::do_add_symbols(
1842 Symbol_table
* symtab
,
1846 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1847 unsigned char symbuf
[sym_size
];
1848 elfcpp::Sym
<size
, big_endian
> sym(symbuf
);
1849 elfcpp::Sym_write
<size
, big_endian
> osym(symbuf
);
1851 typedef typename
elfcpp::Elf_types
<size
>::Elf_WXword Elf_size_type
;
1853 unsigned int nsyms
= this->input_reader_
.get_global_symbol_count();
1854 this->symbols_
.resize(nsyms
);
1856 Incremental_binary::View
symtab_view(NULL
);
1857 unsigned int symtab_count
;
1858 elfcpp::Elf_strtab
strtab(NULL
, 0);
1859 this->ibase_
->get_symtab_view(&symtab_view
, &symtab_count
, &strtab
);
1861 Incremental_symtab_reader
<big_endian
> isymtab(this->ibase_
->symtab_reader());
1862 unsigned int isym_count
= isymtab
.symbol_count();
1863 unsigned int first_global
= symtab_count
- isym_count
;
1865 const unsigned char* sym_p
;
1866 for (unsigned int i
= 0; i
< nsyms
; ++i
)
1868 Incremental_global_symbol_reader
<big_endian
> info
=
1869 this->input_reader_
.get_global_symbol_reader(i
);
1870 unsigned int output_symndx
= info
.output_symndx();
1871 sym_p
= symtab_view
.data() + output_symndx
* sym_size
;
1872 elfcpp::Sym
<size
, big_endian
> gsym(sym_p
);
1874 if (!strtab
.get_c_string(gsym
.get_st_name(), &name
))
1877 typename
elfcpp::Elf_types
<size
>::Elf_Addr v
= gsym
.get_st_value();
1878 unsigned int shndx
= gsym
.get_st_shndx();
1879 elfcpp::STB st_bind
= gsym
.get_st_bind();
1880 elfcpp::STT st_type
= gsym
.get_st_type();
1882 // Local hidden symbols start out as globals, but get converted to
1883 // to local during output.
1884 if (st_bind
== elfcpp::STB_LOCAL
)
1885 st_bind
= elfcpp::STB_GLOBAL
;
1887 unsigned int input_shndx
= info
.shndx();
1888 if (input_shndx
== 0)
1890 shndx
= elfcpp::SHN_UNDEF
;
1893 else if (shndx
!= elfcpp::SHN_ABS
)
1895 // Find the input section and calculate the section-relative value.
1896 gold_assert(shndx
!= elfcpp::SHN_UNDEF
);
1897 Output_section
* os
= this->ibase_
->output_section(shndx
);
1898 gold_assert(os
!= NULL
&& os
->has_fixed_layout());
1899 typename
Input_entry_reader::Input_section_info sect
=
1900 this->input_reader_
.get_input_section(input_shndx
- 1);
1901 gold_assert(sect
.output_shndx
== shndx
);
1902 if (st_type
!= elfcpp::STT_TLS
)
1904 v
-= sect
.sh_offset
;
1905 shndx
= input_shndx
;
1908 osym
.put_st_name(0);
1909 osym
.put_st_value(v
);
1910 osym
.put_st_size(gsym
.get_st_size());
1911 osym
.put_st_info(st_bind
, st_type
);
1912 osym
.put_st_other(gsym
.get_st_other());
1913 osym
.put_st_shndx(shndx
);
1916 symtab
->add_from_incrobj(this, name
, NULL
, &sym
);
1917 this->ibase_
->add_global_symbol(output_symndx
- first_global
,
1922 // Return TRUE if we should include this object from an archive library.
1924 template<int size
, bool big_endian
>
1925 Archive::Should_include
1926 Sized_relobj_incr
<size
, big_endian
>::do_should_include_member(
1935 // Iterate over global symbols, calling a visitor class V for each.
1937 template<int size
, bool big_endian
>
1939 Sized_relobj_incr
<size
, big_endian
>::do_for_all_global_symbols(
1941 Library_base::Symbol_visitor_base
*)
1943 // This routine is not used for incremental objects.
1946 // Get the size of a section.
1948 template<int size
, bool big_endian
>
1950 Sized_relobj_incr
<size
, big_endian
>::do_section_size(unsigned int)
1955 // Get the name of a section.
1957 template<int size
, bool big_endian
>
1959 Sized_relobj_incr
<size
, big_endian
>::do_section_name(unsigned int)
1964 // Return a view of the contents of a section.
1966 template<int size
, bool big_endian
>
1968 Sized_relobj_incr
<size
, big_endian
>::do_section_contents(unsigned int)
1973 // Return section flags.
1975 template<int size
, bool big_endian
>
1977 Sized_relobj_incr
<size
, big_endian
>::do_section_flags(unsigned int)
1982 // Return section entsize.
1984 template<int size
, bool big_endian
>
1986 Sized_relobj_incr
<size
, big_endian
>::do_section_entsize(unsigned int)
1991 // Return section address.
1993 template<int size
, bool big_endian
>
1995 Sized_relobj_incr
<size
, big_endian
>::do_section_address(unsigned int)
2000 // Return section type.
2002 template<int size
, bool big_endian
>
2004 Sized_relobj_incr
<size
, big_endian
>::do_section_type(unsigned int)
2009 // Return the section link field.
2011 template<int size
, bool big_endian
>
2013 Sized_relobj_incr
<size
, big_endian
>::do_section_link(unsigned int)
2018 // Return the section link field.
2020 template<int size
, bool big_endian
>
2022 Sized_relobj_incr
<size
, big_endian
>::do_section_info(unsigned int)
2027 // Return the section alignment.
2029 template<int size
, bool big_endian
>
2031 Sized_relobj_incr
<size
, big_endian
>::do_section_addralign(unsigned int)
2036 // Return the Xindex structure to use.
2038 template<int size
, bool big_endian
>
2040 Sized_relobj_incr
<size
, big_endian
>::do_initialize_xindex()
2045 // Get symbol counts.
2047 template<int size
, bool big_endian
>
2049 Sized_relobj_incr
<size
, big_endian
>::do_get_global_symbol_counts(
2050 const Symbol_table
*, size_t*, size_t*) const
2057 template<int size
, bool big_endian
>
2059 Sized_relobj_incr
<size
, big_endian
>::do_read_relocs(Read_relocs_data
*)
2063 // Process the relocs to find list of referenced sections. Used only
2064 // during garbage collection.
2066 template<int size
, bool big_endian
>
2068 Sized_relobj_incr
<size
, big_endian
>::do_gc_process_relocs(Symbol_table
*,
2075 // Scan the relocs and adjust the symbol table.
2077 template<int size
, bool big_endian
>
2079 Sized_relobj_incr
<size
, big_endian
>::do_scan_relocs(Symbol_table
*,
2083 // Count the incremental relocations for this object.
2084 unsigned int nsyms
= this->input_reader_
.get_global_symbol_count();
2085 this->allocate_incremental_reloc_counts();
2086 for (unsigned int i
= 0; i
< nsyms
; i
++)
2088 Incremental_global_symbol_reader
<big_endian
> sym
=
2089 this->input_reader_
.get_global_symbol_reader(i
);
2090 unsigned int reloc_count
= sym
.reloc_count();
2091 if (reloc_count
> 0 && this->incr_reloc_offset_
== -1U)
2092 this->incr_reloc_offset_
= sym
.reloc_offset();
2093 this->incr_reloc_count_
+= reloc_count
;
2094 for (unsigned int j
= 0; j
< reloc_count
; j
++)
2095 this->count_incremental_reloc(i
);
2097 this->incr_reloc_output_index_
=
2098 layout
->incremental_inputs()->get_reloc_count();
2099 this->finalize_incremental_relocs(layout
, false);
2101 // The incoming incremental relocations may not end up in the same
2102 // location after the incremental update, because the incremental info
2103 // is regenerated in each link. Because the new location may overlap
2104 // with other data in the updated output file, we need to copy the
2105 // relocations into a buffer so that we can still read them safely
2106 // after we start writing updates to the output file.
2107 if (this->incr_reloc_count_
> 0)
2109 const Incremental_relocs_reader
<size
, big_endian
>& relocs_reader
=
2110 this->ibase_
->relocs_reader();
2111 const unsigned int incr_reloc_size
= relocs_reader
.reloc_size
;
2112 unsigned int len
= this->incr_reloc_count_
* incr_reloc_size
;
2113 this->incr_relocs_
= new unsigned char[len
];
2114 memcpy(this->incr_relocs_
,
2115 relocs_reader
.data(this->incr_reloc_offset_
),
2120 // Count the local symbols.
2122 template<int size
, bool big_endian
>
2124 Sized_relobj_incr
<size
, big_endian
>::do_count_local_symbols(
2125 Stringpool_template
<char>* pool
,
2126 Stringpool_template
<char>*)
2128 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2130 // Set the count of local symbols based on the incremental info.
2131 unsigned int nlocals
= this->input_reader_
.get_local_symbol_count();
2132 this->local_symbol_count_
= nlocals
;
2133 this->local_symbols_
.reserve(nlocals
);
2135 // Get views of the base file's symbol table and string table.
2136 Incremental_binary::View
symtab_view(NULL
);
2137 unsigned int symtab_count
;
2138 elfcpp::Elf_strtab
strtab(NULL
, 0);
2139 this->ibase_
->get_symtab_view(&symtab_view
, &symtab_count
, &strtab
);
2141 // Read the local symbols from the base file's symbol table.
2142 off_t off
= this->input_reader_
.get_local_symbol_offset();
2143 const unsigned char* symp
= symtab_view
.data() + off
;
2144 for (unsigned int i
= 0; i
< nlocals
; ++i
, symp
+= sym_size
)
2146 elfcpp::Sym
<size
, big_endian
> sym(symp
);
2148 if (!strtab
.get_c_string(sym
.get_st_name(), &name
))
2150 gold_debug(DEBUG_INCREMENTAL
, "Local symbol %d: %s", i
, name
);
2151 name
= pool
->add(name
, true, NULL
);
2152 this->local_symbols_
.push_back(Local_symbol(name
,
2161 // Finalize the local symbols.
2163 template<int size
, bool big_endian
>
2165 Sized_relobj_incr
<size
, big_endian
>::do_finalize_local_symbols(
2170 this->local_symbol_index_
= index
;
2171 this->local_symbol_offset_
= off
;
2172 return index
+ this->local_symbol_count_
;
2175 // Set the offset where local dynamic symbol information will be stored.
2177 template<int size
, bool big_endian
>
2179 Sized_relobj_incr
<size
, big_endian
>::do_set_local_dynsym_indexes(
2182 // FIXME: set local dynsym indexes.
2186 // Set the offset where local dynamic symbol information will be stored.
2188 template<int size
, bool big_endian
>
2190 Sized_relobj_incr
<size
, big_endian
>::do_set_local_dynsym_offset(off_t
)
2195 // Relocate the input sections and write out the local symbols.
2196 // We don't actually do any relocation here. For unchanged input files,
2197 // we reapply relocations only for symbols that have changed; that happens
2198 // in queue_final_tasks. We do need to rewrite the incremental relocations
2201 template<int size
, bool big_endian
>
2203 Sized_relobj_incr
<size
, big_endian
>::do_relocate(const Symbol_table
*,
2204 const Layout
* layout
,
2207 if (this->incr_reloc_count_
== 0)
2210 const unsigned int incr_reloc_size
=
2211 Incremental_relocs_reader
<size
, big_endian
>::reloc_size
;
2213 // Get a view for the .gnu_incremental_relocs section.
2214 Incremental_inputs
* inputs
= layout
->incremental_inputs();
2215 gold_assert(inputs
!= NULL
);
2216 const off_t relocs_off
= inputs
->relocs_section()->offset();
2217 const off_t relocs_size
= inputs
->relocs_section()->data_size();
2218 unsigned char* const view
= of
->get_output_view(relocs_off
, relocs_size
);
2220 // Copy the relocations from the buffer.
2221 off_t off
= this->incr_reloc_output_index_
* incr_reloc_size
;
2222 unsigned int len
= this->incr_reloc_count_
* incr_reloc_size
;
2223 memcpy(view
+ off
, this->incr_relocs_
, len
);
2225 // The output section table may have changed, so we need to map
2226 // the old section index to the new section index for each relocation.
2227 for (unsigned int i
= 0; i
< this->incr_reloc_count_
; ++i
)
2229 unsigned char* pov
= view
+ off
+ i
* incr_reloc_size
;
2230 unsigned int shndx
= elfcpp::Swap
<32, big_endian
>::readval(pov
+ 4);
2231 Output_section
* os
= this->ibase_
->output_section(shndx
);
2232 gold_assert(os
!= NULL
);
2233 shndx
= os
->out_shndx();
2234 elfcpp::Swap
<32, big_endian
>::writeval(pov
+ 4, shndx
);
2237 of
->write_output_view(off
, len
, view
);
2239 // Get views into the output file for the portions of the symbol table
2240 // and the dynamic symbol table that we will be writing.
2241 off_t symtab_off
= layout
->symtab_section()->offset();
2242 off_t output_size
= this->local_symbol_count_
* This::sym_size
;
2243 unsigned char* oview
= NULL
;
2244 if (output_size
> 0)
2245 oview
= of
->get_output_view(symtab_off
+ this->local_symbol_offset_
,
2248 off_t dyn_output_size
= this->output_local_dynsym_count_
* sym_size
;
2249 unsigned char* dyn_oview
= NULL
;
2250 if (dyn_output_size
> 0)
2251 dyn_oview
= of
->get_output_view(this->local_dynsym_offset_
,
2254 // Write the local symbols.
2255 unsigned char* ov
= oview
;
2256 unsigned char* dyn_ov
= dyn_oview
;
2257 const Stringpool
* sympool
= layout
->sympool();
2258 const Stringpool
* dynpool
= layout
->dynpool();
2259 Output_symtab_xindex
* symtab_xindex
= layout
->symtab_xindex();
2260 Output_symtab_xindex
* dynsym_xindex
= layout
->dynsym_xindex();
2261 for (unsigned int i
= 0; i
< this->local_symbol_count_
; ++i
)
2263 Local_symbol
& lsym(this->local_symbols_
[i
]);
2266 unsigned int st_shndx
= this->adjust_sym_shndx(i
, lsym
.st_shndx
,
2270 Output_section
* os
= this->ibase_
->output_section(st_shndx
);
2271 st_shndx
= os
->out_shndx();
2272 if (st_shndx
>= elfcpp::SHN_LORESERVE
)
2274 symtab_xindex
->add(this->local_symbol_index_
+ i
, st_shndx
);
2275 if (lsym
.needs_dynsym_entry
)
2276 dynsym_xindex
->add(lsym
.output_dynsym_index
, st_shndx
);
2277 st_shndx
= elfcpp::SHN_XINDEX
;
2281 // Write the symbol to the output symbol table.
2283 elfcpp::Sym_write
<size
, big_endian
> osym(ov
);
2284 osym
.put_st_name(sympool
->get_offset(lsym
.name
));
2285 osym
.put_st_value(lsym
.st_value
);
2286 osym
.put_st_size(lsym
.st_size
);
2287 osym
.put_st_info(elfcpp::STB_LOCAL
,
2288 static_cast<elfcpp::STT
>(lsym
.st_type
));
2289 osym
.put_st_other(0);
2290 osym
.put_st_shndx(st_shndx
);
2294 // Write the symbol to the output dynamic symbol table.
2295 if (lsym
.needs_dynsym_entry
)
2297 gold_assert(dyn_ov
< dyn_oview
+ dyn_output_size
);
2298 elfcpp::Sym_write
<size
, big_endian
> osym(dyn_ov
);
2299 osym
.put_st_name(dynpool
->get_offset(lsym
.name
));
2300 osym
.put_st_value(lsym
.st_value
);
2301 osym
.put_st_size(lsym
.st_size
);
2302 osym
.put_st_info(elfcpp::STB_LOCAL
,
2303 static_cast<elfcpp::STT
>(lsym
.st_type
));
2304 osym
.put_st_other(0);
2305 osym
.put_st_shndx(st_shndx
);
2310 if (output_size
> 0)
2312 gold_assert(ov
- oview
== output_size
);
2313 of
->write_output_view(symtab_off
+ this->local_symbol_offset_
,
2314 output_size
, oview
);
2317 if (dyn_output_size
> 0)
2319 gold_assert(dyn_ov
- dyn_oview
== dyn_output_size
);
2320 of
->write_output_view(this->local_dynsym_offset_
, dyn_output_size
,
2325 // Set the offset of a section.
2327 template<int size
, bool big_endian
>
2329 Sized_relobj_incr
<size
, big_endian
>::do_set_section_offset(unsigned int,
2334 // Class Sized_incr_dynobj. Most of these methods are not used for
2335 // Incremental objects, but are required to be implemented by the
2336 // base class Object.
2338 template<int size
, bool big_endian
>
2339 Sized_incr_dynobj
<size
, big_endian
>::Sized_incr_dynobj(
2340 const std::string
& name
,
2341 Sized_incremental_binary
<size
, big_endian
>* ibase
,
2342 unsigned int input_file_index
)
2343 : Dynobj(name
, NULL
), ibase_(ibase
),
2344 input_file_index_(input_file_index
),
2345 input_reader_(ibase
->inputs_reader().input_file(input_file_index
)),
2348 if (this->input_reader_
.is_in_system_directory())
2349 this->set_is_in_system_directory();
2353 // Read the symbols.
2355 template<int size
, bool big_endian
>
2357 Sized_incr_dynobj
<size
, big_endian
>::do_read_symbols(Read_symbols_data
*)
2362 // Lay out the input sections.
2364 template<int size
, bool big_endian
>
2366 Sized_incr_dynobj
<size
, big_endian
>::do_layout(
2373 // Add the symbols to the symbol table.
2375 template<int size
, bool big_endian
>
2377 Sized_incr_dynobj
<size
, big_endian
>::do_add_symbols(
2378 Symbol_table
* symtab
,
2382 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2383 unsigned char symbuf
[sym_size
];
2384 elfcpp::Sym
<size
, big_endian
> sym(symbuf
);
2385 elfcpp::Sym_write
<size
, big_endian
> osym(symbuf
);
2387 typedef typename
elfcpp::Elf_types
<size
>::Elf_WXword Elf_size_type
;
2389 unsigned int nsyms
= this->input_reader_
.get_global_symbol_count();
2390 this->symbols_
.resize(nsyms
);
2392 Incremental_binary::View
symtab_view(NULL
);
2393 unsigned int symtab_count
;
2394 elfcpp::Elf_strtab
strtab(NULL
, 0);
2395 this->ibase_
->get_symtab_view(&symtab_view
, &symtab_count
, &strtab
);
2397 Incremental_symtab_reader
<big_endian
> isymtab(this->ibase_
->symtab_reader());
2398 unsigned int isym_count
= isymtab
.symbol_count();
2399 unsigned int first_global
= symtab_count
- isym_count
;
2401 const unsigned char* sym_p
;
2402 for (unsigned int i
= 0; i
< nsyms
; ++i
)
2405 unsigned int output_symndx
=
2406 this->input_reader_
.get_output_symbol_index(i
, &is_def
);
2407 sym_p
= symtab_view
.data() + output_symndx
* sym_size
;
2408 elfcpp::Sym
<size
, big_endian
> gsym(sym_p
);
2410 if (!strtab
.get_c_string(gsym
.get_st_name(), &name
))
2413 typename
elfcpp::Elf_types
<size
>::Elf_Addr v
;
2415 elfcpp::STB st_bind
= gsym
.get_st_bind();
2416 elfcpp::STT st_type
= gsym
.get_st_type();
2418 // Local hidden symbols start out as globals, but get converted to
2419 // to local during output.
2420 if (st_bind
== elfcpp::STB_LOCAL
)
2421 st_bind
= elfcpp::STB_GLOBAL
;
2425 shndx
= elfcpp::SHN_UNDEF
;
2430 // For a symbol defined in a shared object, the section index
2431 // is meaningless, as long as it's not SHN_UNDEF.
2433 v
= gsym
.get_st_value();
2436 osym
.put_st_name(0);
2437 osym
.put_st_value(v
);
2438 osym
.put_st_size(gsym
.get_st_size());
2439 osym
.put_st_info(st_bind
, st_type
);
2440 osym
.put_st_other(gsym
.get_st_other());
2441 osym
.put_st_shndx(shndx
);
2444 symtab
->add_from_incrobj
<size
, big_endian
>(this, name
, NULL
, &sym
);
2445 this->ibase_
->add_global_symbol(output_symndx
- first_global
,
2450 // Return TRUE if we should include this object from an archive library.
2452 template<int size
, bool big_endian
>
2453 Archive::Should_include
2454 Sized_incr_dynobj
<size
, big_endian
>::do_should_include_member(
2463 // Iterate over global symbols, calling a visitor class V for each.
2465 template<int size
, bool big_endian
>
2467 Sized_incr_dynobj
<size
, big_endian
>::do_for_all_global_symbols(
2469 Library_base::Symbol_visitor_base
*)
2471 // This routine is not used for dynamic libraries.
2474 // Iterate over local symbols, calling a visitor class V for each GOT offset
2475 // associated with a local symbol.
2477 template<int size
, bool big_endian
>
2479 Sized_incr_dynobj
<size
, big_endian
>::do_for_all_local_got_entries(
2480 Got_offset_list::Visitor
*) const
2484 // Get the size of a section.
2486 template<int size
, bool big_endian
>
2488 Sized_incr_dynobj
<size
, big_endian
>::do_section_size(unsigned int)
2493 // Get the name of a section.
2495 template<int size
, bool big_endian
>
2497 Sized_incr_dynobj
<size
, big_endian
>::do_section_name(unsigned int)
2502 // Return a view of the contents of a section.
2504 template<int size
, bool big_endian
>
2506 Sized_incr_dynobj
<size
, big_endian
>::do_section_contents(unsigned int)
2511 // Return section flags.
2513 template<int size
, bool big_endian
>
2515 Sized_incr_dynobj
<size
, big_endian
>::do_section_flags(unsigned int)
2520 // Return section entsize.
2522 template<int size
, bool big_endian
>
2524 Sized_incr_dynobj
<size
, big_endian
>::do_section_entsize(unsigned int)
2529 // Return section address.
2531 template<int size
, bool big_endian
>
2533 Sized_incr_dynobj
<size
, big_endian
>::do_section_address(unsigned int)
2538 // Return section type.
2540 template<int size
, bool big_endian
>
2542 Sized_incr_dynobj
<size
, big_endian
>::do_section_type(unsigned int)
2547 // Return the section link field.
2549 template<int size
, bool big_endian
>
2551 Sized_incr_dynobj
<size
, big_endian
>::do_section_link(unsigned int)
2556 // Return the section link field.
2558 template<int size
, bool big_endian
>
2560 Sized_incr_dynobj
<size
, big_endian
>::do_section_info(unsigned int)
2565 // Return the section alignment.
2567 template<int size
, bool big_endian
>
2569 Sized_incr_dynobj
<size
, big_endian
>::do_section_addralign(unsigned int)
2574 // Return the Xindex structure to use.
2576 template<int size
, bool big_endian
>
2578 Sized_incr_dynobj
<size
, big_endian
>::do_initialize_xindex()
2583 // Get symbol counts.
2585 template<int size
, bool big_endian
>
2587 Sized_incr_dynobj
<size
, big_endian
>::do_get_global_symbol_counts(
2588 const Symbol_table
*, size_t*, size_t*) const
2593 // Allocate an incremental object of the appropriate size and endianness.
2596 make_sized_incremental_object(
2597 Incremental_binary
* ibase
,
2598 unsigned int input_file_index
,
2599 Incremental_input_type input_type
,
2600 const Incremental_binary::Input_reader
* input_reader
)
2603 std::string
name(input_reader
->filename());
2605 switch (parameters
->size_and_endianness())
2607 #ifdef HAVE_TARGET_32_LITTLE
2608 case Parameters::TARGET_32_LITTLE
:
2610 Sized_incremental_binary
<32, false>* sized_ibase
=
2611 static_cast<Sized_incremental_binary
<32, false>*>(ibase
);
2612 if (input_type
== INCREMENTAL_INPUT_SHARED_LIBRARY
)
2613 obj
= new Sized_incr_dynobj
<32, false>(name
, sized_ibase
,
2616 obj
= new Sized_relobj_incr
<32, false>(name
, sized_ibase
,
2621 #ifdef HAVE_TARGET_32_BIG
2622 case Parameters::TARGET_32_BIG
:
2624 Sized_incremental_binary
<32, true>* sized_ibase
=
2625 static_cast<Sized_incremental_binary
<32, true>*>(ibase
);
2626 if (input_type
== INCREMENTAL_INPUT_SHARED_LIBRARY
)
2627 obj
= new Sized_incr_dynobj
<32, true>(name
, sized_ibase
,
2630 obj
= new Sized_relobj_incr
<32, true>(name
, sized_ibase
,
2635 #ifdef HAVE_TARGET_64_LITTLE
2636 case Parameters::TARGET_64_LITTLE
:
2638 Sized_incremental_binary
<64, false>* sized_ibase
=
2639 static_cast<Sized_incremental_binary
<64, false>*>(ibase
);
2640 if (input_type
== INCREMENTAL_INPUT_SHARED_LIBRARY
)
2641 obj
= new Sized_incr_dynobj
<64, false>(name
, sized_ibase
,
2644 obj
= new Sized_relobj_incr
<64, false>(name
, sized_ibase
,
2649 #ifdef HAVE_TARGET_64_BIG
2650 case Parameters::TARGET_64_BIG
:
2652 Sized_incremental_binary
<64, true>* sized_ibase
=
2653 static_cast<Sized_incremental_binary
<64, true>*>(ibase
);
2654 if (input_type
== INCREMENTAL_INPUT_SHARED_LIBRARY
)
2655 obj
= new Sized_incr_dynobj
<64, true>(name
, sized_ibase
,
2658 obj
= new Sized_relobj_incr
<64, true>(name
, sized_ibase
,
2667 gold_assert(obj
!= NULL
);
2671 // Copy the unused symbols from the incremental input info.
2672 // We need to do this because we may be overwriting the incremental
2673 // input info in the base file before we write the new incremental
2676 Incremental_library::copy_unused_symbols()
2678 unsigned int symcount
= this->input_reader_
->get_unused_symbol_count();
2679 this->unused_symbols_
.reserve(symcount
);
2680 for (unsigned int i
= 0; i
< symcount
; ++i
)
2682 std::string
name(this->input_reader_
->get_unused_symbol(i
));
2683 this->unused_symbols_
.push_back(name
);
2687 // Iterator for unused global symbols in the library.
2689 Incremental_library::do_for_all_unused_symbols(Symbol_visitor_base
* v
) const
2691 for (Symbol_list::const_iterator p
= this->unused_symbols_
.begin();
2692 p
!= this->unused_symbols_
.end();
2694 v
->visit(p
->c_str());
2697 // Instantiate the templates we need.
2699 #ifdef HAVE_TARGET_32_LITTLE
2701 class Sized_incremental_binary
<32, false>;
2704 class Sized_relobj_incr
<32, false>;
2707 class Sized_incr_dynobj
<32, false>;
2710 #ifdef HAVE_TARGET_32_BIG
2712 class Sized_incremental_binary
<32, true>;
2715 class Sized_relobj_incr
<32, true>;
2718 class Sized_incr_dynobj
<32, true>;
2721 #ifdef HAVE_TARGET_64_LITTLE
2723 class Sized_incremental_binary
<64, false>;
2726 class Sized_relobj_incr
<64, false>;
2729 class Sized_incr_dynobj
<64, false>;
2732 #ifdef HAVE_TARGET_64_BIG
2734 class Sized_incremental_binary
<64, true>;
2737 class Sized_relobj_incr
<64, true>;
2740 class Sized_incr_dynobj
<64, true>;
2743 } // End namespace gold.