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("--incremental-base=", argv
[i
])
865 || is_prefix_of("--debug=", argv
[i
]))
867 if (strcmp(argv
[i
], "--incremental-base") == 0
868 || strcmp(argv
[i
], "--debug") == 0)
870 // When these options are used without the '=', skip the
871 // following parameter as well.
877 // Now append argv[i], but with all single-quotes escaped
878 const char* argpos
= argv
[i
];
881 const int len
= strcspn(argpos
, "'");
882 args
.append(argpos
, len
);
883 if (argpos
[len
] == '\0')
885 args
.append("'\"'\"'");
891 this->command_line_
= args
;
892 this->strtab_
->add(this->command_line_
.c_str(), false,
893 &this->command_line_key_
);
896 // Record the input archive file ARCHIVE. This is called by the
897 // Add_archive_symbols task before determining which archive members
898 // to include. We create the Incremental_archive_entry here and
899 // attach it to the Archive, but we do not add it to the list of
900 // input objects until report_archive_end is called.
903 Incremental_inputs::report_archive_begin(Library_base
* arch
,
904 unsigned int arg_serial
,
905 Script_info
* script_info
)
907 Stringpool::Key filename_key
;
908 Timespec mtime
= arch
->get_mtime();
910 // For a file loaded from a script, don't record its argument serial number.
911 if (script_info
!= NULL
)
914 this->strtab_
->add(arch
->filename().c_str(), false, &filename_key
);
915 Incremental_archive_entry
* entry
=
916 new Incremental_archive_entry(filename_key
, arg_serial
, mtime
);
917 arch
->set_incremental_info(entry
);
919 if (script_info
!= NULL
)
921 Incremental_script_entry
* script_entry
= script_info
->incremental_info();
922 gold_assert(script_entry
!= NULL
);
923 script_entry
->add_object(entry
);
927 // Visitor class for processing the unused global symbols in a library.
928 // An instance of this class is passed to the library's
929 // for_all_unused_symbols() iterator, which will call the visit()
930 // function for each global symbol defined in each unused library
931 // member. We add those symbol names to the incremental info for the
934 class Unused_symbol_visitor
: public Library_base::Symbol_visitor_base
937 Unused_symbol_visitor(Incremental_archive_entry
* entry
, Stringpool
* strtab
)
938 : entry_(entry
), strtab_(strtab
)
942 visit(const char* sym
)
944 Stringpool::Key symbol_key
;
945 this->strtab_
->add(sym
, true, &symbol_key
);
946 this->entry_
->add_unused_global_symbol(symbol_key
);
950 Incremental_archive_entry
* entry_
;
954 // Finish recording the input archive file ARCHIVE. This is called by the
955 // Add_archive_symbols task after determining which archive members
959 Incremental_inputs::report_archive_end(Library_base
* arch
)
961 Incremental_archive_entry
* entry
= arch
->incremental_info();
963 gold_assert(entry
!= NULL
);
964 this->inputs_
.push_back(entry
);
966 // Collect unused global symbols.
967 Unused_symbol_visitor
v(entry
, this->strtab_
);
968 arch
->for_all_unused_symbols(&v
);
971 // Record the input object file OBJ. If ARCH is not NULL, attach
972 // the object file to the archive. This is called by the
973 // Add_symbols task after finding out the type of the file.
976 Incremental_inputs::report_object(Object
* obj
, unsigned int arg_serial
,
977 Library_base
* arch
, Script_info
* script_info
)
979 Stringpool::Key filename_key
;
980 Timespec mtime
= obj
->get_mtime();
982 // For a file loaded from a script, don't record its argument serial number.
983 if (script_info
!= NULL
)
986 this->strtab_
->add(obj
->name().c_str(), false, &filename_key
);
988 Incremental_input_entry
* input_entry
;
990 this->current_object_
= obj
;
992 if (!obj
->is_dynamic())
994 this->current_object_entry_
=
995 new Incremental_object_entry(filename_key
, obj
, arg_serial
, mtime
);
996 input_entry
= this->current_object_entry_
;
999 Incremental_archive_entry
* arch_entry
= arch
->incremental_info();
1000 gold_assert(arch_entry
!= NULL
);
1001 arch_entry
->add_object(this->current_object_entry_
);
1006 this->current_object_entry_
= NULL
;
1007 Stringpool::Key soname_key
;
1008 Dynobj
* dynobj
= obj
->dynobj();
1009 gold_assert(dynobj
!= NULL
);
1010 this->strtab_
->add(dynobj
->soname(), false, &soname_key
);
1011 input_entry
= new Incremental_dynobj_entry(filename_key
, soname_key
, obj
,
1015 if (obj
->is_in_system_directory())
1016 input_entry
->set_is_in_system_directory();
1018 if (obj
->as_needed())
1019 input_entry
->set_as_needed();
1021 this->inputs_
.push_back(input_entry
);
1023 if (script_info
!= NULL
)
1025 Incremental_script_entry
* script_entry
= script_info
->incremental_info();
1026 gold_assert(script_entry
!= NULL
);
1027 script_entry
->add_object(input_entry
);
1031 // Record the input object file OBJ. If ARCH is not NULL, attach
1032 // the object file to the archive. This is called by the
1033 // Add_symbols task after finding out the type of the file.
1036 Incremental_inputs::report_input_section(Object
* obj
, unsigned int shndx
,
1037 const char* name
, off_t sh_size
)
1039 Stringpool::Key key
= 0;
1042 this->strtab_
->add(name
, true, &key
);
1044 gold_assert(obj
== this->current_object_
);
1045 gold_assert(this->current_object_entry_
!= NULL
);
1046 this->current_object_entry_
->add_input_section(shndx
, key
, sh_size
);
1049 // Record that the input argument INPUT is a script SCRIPT. This is
1050 // called by read_script after parsing the script and reading the list
1051 // of inputs added by this script.
1054 Incremental_inputs::report_script(Script_info
* script
,
1055 unsigned int arg_serial
,
1058 Stringpool::Key filename_key
;
1060 this->strtab_
->add(script
->filename().c_str(), false, &filename_key
);
1061 Incremental_script_entry
* entry
=
1062 new Incremental_script_entry(filename_key
, arg_serial
, script
, mtime
);
1063 this->inputs_
.push_back(entry
);
1064 script
->set_incremental_info(entry
);
1067 // Finalize the incremental link information. Called from
1068 // Layout::finalize.
1071 Incremental_inputs::finalize()
1073 // Finalize the string table.
1074 this->strtab_
->set_string_offsets();
1077 // Create the .gnu_incremental_inputs, _symtab, and _relocs input sections.
1080 Incremental_inputs::create_data_sections(Symbol_table
* symtab
)
1082 switch (parameters
->size_and_endianness())
1084 #ifdef HAVE_TARGET_32_LITTLE
1085 case Parameters::TARGET_32_LITTLE
:
1086 this->inputs_section_
=
1087 new Output_section_incremental_inputs
<32, false>(this, symtab
);
1090 #ifdef HAVE_TARGET_32_BIG
1091 case Parameters::TARGET_32_BIG
:
1092 this->inputs_section_
=
1093 new Output_section_incremental_inputs
<32, true>(this, symtab
);
1096 #ifdef HAVE_TARGET_64_LITTLE
1097 case Parameters::TARGET_64_LITTLE
:
1098 this->inputs_section_
=
1099 new Output_section_incremental_inputs
<64, false>(this, symtab
);
1102 #ifdef HAVE_TARGET_64_BIG
1103 case Parameters::TARGET_64_BIG
:
1104 this->inputs_section_
=
1105 new Output_section_incremental_inputs
<64, true>(this, symtab
);
1111 this->symtab_section_
= new Output_data_space(4, "** incremental_symtab");
1112 this->relocs_section_
= new Output_data_space(4, "** incremental_relocs");
1113 this->got_plt_section_
= new Output_data_space(4, "** incremental_got_plt");
1116 // Return the sh_entsize value for the .gnu_incremental_relocs section.
1118 Incremental_inputs::relocs_entsize() const
1120 return 8 + 2 * parameters
->target().get_size() / 8;
1123 // Class Output_section_incremental_inputs.
1125 // Finalize the offsets for each input section and supplemental info block,
1126 // and set the final data size of the incremental output sections.
1128 template<int size
, bool big_endian
>
1130 Output_section_incremental_inputs
<size
, big_endian
>::set_final_data_size()
1132 const Incremental_inputs
* inputs
= this->inputs_
;
1133 const unsigned int sizeof_addr
= size
/ 8;
1134 const unsigned int rel_size
= 8 + 2 * sizeof_addr
;
1136 // Offset of each input entry.
1137 unsigned int input_offset
= this->header_size
;
1139 // Offset of each supplemental info block.
1140 unsigned int file_index
= 0;
1141 unsigned int info_offset
= this->header_size
;
1142 info_offset
+= this->input_entry_size
* inputs
->input_file_count();
1144 // Count each input file and its supplemental information block.
1145 for (Incremental_inputs::Input_list::const_iterator p
=
1146 inputs
->input_files().begin();
1147 p
!= inputs
->input_files().end();
1150 // Set the index and offset of the input file entry.
1151 (*p
)->set_offset(file_index
, input_offset
);
1153 input_offset
+= this->input_entry_size
;
1155 // Set the offset of the supplemental info block.
1156 switch ((*p
)->type())
1158 case INCREMENTAL_INPUT_SCRIPT
:
1160 Incremental_script_entry
*entry
= (*p
)->script_entry();
1161 gold_assert(entry
!= NULL
);
1162 (*p
)->set_info_offset(info_offset
);
1166 info_offset
+= (entry
->get_object_count() * 4);
1169 case INCREMENTAL_INPUT_OBJECT
:
1170 case INCREMENTAL_INPUT_ARCHIVE_MEMBER
:
1172 Incremental_object_entry
* entry
= (*p
)->object_entry();
1173 gold_assert(entry
!= NULL
);
1174 (*p
)->set_info_offset(info_offset
);
1175 // Input section count, global symbol count, local symbol offset,
1176 // local symbol count, first dynamic reloc, dynamic reloc count.
1178 // Each input section.
1179 info_offset
+= (entry
->get_input_section_count()
1180 * (8 + 2 * sizeof_addr
));
1181 // Each global symbol.
1182 const Object::Symbols
* syms
= entry
->object()->get_global_symbols();
1183 info_offset
+= syms
->size() * 20;
1186 case INCREMENTAL_INPUT_SHARED_LIBRARY
:
1188 Incremental_dynobj_entry
* entry
= (*p
)->dynobj_entry();
1189 gold_assert(entry
!= NULL
);
1190 (*p
)->set_info_offset(info_offset
);
1191 // Global symbol count, soname index.
1193 // Each global symbol.
1194 const Object::Symbols
* syms
= entry
->object()->get_global_symbols();
1195 gold_assert(syms
!= NULL
);
1196 unsigned int nsyms
= syms
->size();
1197 unsigned int nsyms_out
= 0;
1198 for (unsigned int i
= 0; i
< nsyms
; ++i
)
1200 const Symbol
* sym
= (*syms
)[i
];
1203 if (sym
->is_forwarder())
1204 sym
= this->symtab_
->resolve_forwards(sym
);
1205 if (sym
->symtab_index() != -1U)
1208 info_offset
+= nsyms_out
* 4;
1211 case INCREMENTAL_INPUT_ARCHIVE
:
1213 Incremental_archive_entry
* entry
= (*p
)->archive_entry();
1214 gold_assert(entry
!= NULL
);
1215 (*p
)->set_info_offset(info_offset
);
1216 // Member count + unused global symbol count.
1219 info_offset
+= (entry
->get_member_count() * 4);
1220 // Each global symbol.
1221 info_offset
+= (entry
->get_unused_global_symbol_count() * 4);
1229 this->set_data_size(info_offset
);
1231 // Set the size of the .gnu_incremental_symtab section.
1232 inputs
->symtab_section()->set_current_data_size(this->symtab_
->output_count()
1233 * sizeof(unsigned int));
1235 // Set the size of the .gnu_incremental_relocs section.
1236 inputs
->relocs_section()->set_current_data_size(inputs
->get_reloc_count()
1239 // Set the size of the .gnu_incremental_got_plt section.
1240 Sized_target
<size
, big_endian
>* target
=
1241 parameters
->sized_target
<size
, big_endian
>();
1242 unsigned int got_count
= target
->got_entry_count();
1243 unsigned int plt_count
= target
->plt_entry_count();
1244 unsigned int got_plt_size
= 8; // GOT entry count, PLT entry count.
1245 got_plt_size
= (got_plt_size
+ got_count
+ 3) & ~3; // GOT type array.
1246 got_plt_size
+= got_count
* 8 + plt_count
* 4; // GOT array, PLT array.
1247 inputs
->got_plt_section()->set_current_data_size(got_plt_size
);
1250 // Write the contents of the .gnu_incremental_inputs and
1251 // .gnu_incremental_symtab sections.
1253 template<int size
, bool big_endian
>
1255 Output_section_incremental_inputs
<size
, big_endian
>::do_write(Output_file
* of
)
1257 const Incremental_inputs
* inputs
= this->inputs_
;
1258 Stringpool
* strtab
= inputs
->get_stringpool();
1260 // Get a view into the .gnu_incremental_inputs section.
1261 const off_t off
= this->offset();
1262 const off_t oview_size
= this->data_size();
1263 unsigned char* const oview
= of
->get_output_view(off
, oview_size
);
1264 unsigned char* pov
= oview
;
1266 // Get a view into the .gnu_incremental_symtab section.
1267 const off_t symtab_off
= inputs
->symtab_section()->offset();
1268 const off_t symtab_size
= inputs
->symtab_section()->data_size();
1269 unsigned char* const symtab_view
= of
->get_output_view(symtab_off
,
1272 // Allocate an array of linked list heads for the .gnu_incremental_symtab
1273 // section. Each element corresponds to a global symbol in the output
1274 // symbol table, and points to the head of the linked list that threads
1275 // through the object file input entries. The value of each element
1276 // is the section-relative offset to a global symbol entry in a
1277 // supplemental information block.
1278 unsigned int global_sym_count
= this->symtab_
->output_count();
1279 unsigned int* global_syms
= new unsigned int[global_sym_count
];
1280 memset(global_syms
, 0, global_sym_count
* sizeof(unsigned int));
1282 // Write the section header.
1283 Stringpool::Key command_line_key
= inputs
->command_line_key();
1284 pov
= this->write_header(pov
, inputs
->input_file_count(),
1285 strtab
->get_offset_from_key(command_line_key
));
1287 // Write the list of input files.
1288 pov
= this->write_input_files(oview
, pov
, strtab
);
1290 // Write the supplemental information blocks for each input file.
1291 pov
= this->write_info_blocks(oview
, pov
, strtab
, global_syms
,
1294 gold_assert(pov
- oview
== oview_size
);
1296 // Write the .gnu_incremental_symtab section.
1297 gold_assert(global_sym_count
* 4 == symtab_size
);
1298 this->write_symtab(symtab_view
, global_syms
, global_sym_count
);
1300 delete[] global_syms
;
1302 // Write the .gnu_incremental_got_plt section.
1303 const off_t got_plt_off
= inputs
->got_plt_section()->offset();
1304 const off_t got_plt_size
= inputs
->got_plt_section()->data_size();
1305 unsigned char* const got_plt_view
= of
->get_output_view(got_plt_off
,
1307 this->write_got_plt(got_plt_view
, got_plt_size
);
1309 of
->write_output_view(off
, oview_size
, oview
);
1310 of
->write_output_view(symtab_off
, symtab_size
, symtab_view
);
1311 of
->write_output_view(got_plt_off
, got_plt_size
, got_plt_view
);
1314 // Write the section header: version, input file count, offset of command line
1315 // in the string table, and 4 bytes of padding.
1317 template<int size
, bool big_endian
>
1319 Output_section_incremental_inputs
<size
, big_endian
>::write_header(
1321 unsigned int input_file_count
,
1322 section_offset_type command_line_offset
)
1324 Swap32::writeval(pov
, INCREMENTAL_LINK_VERSION
);
1325 Swap32::writeval(pov
+ 4, input_file_count
);
1326 Swap32::writeval(pov
+ 8, command_line_offset
);
1327 Swap32::writeval(pov
+ 12, 0);
1328 return pov
+ this->header_size
;
1331 // Write the input file entries.
1333 template<int size
, bool big_endian
>
1335 Output_section_incremental_inputs
<size
, big_endian
>::write_input_files(
1336 unsigned char* oview
,
1340 const Incremental_inputs
* inputs
= this->inputs_
;
1342 for (Incremental_inputs::Input_list::const_iterator p
=
1343 inputs
->input_files().begin();
1344 p
!= inputs
->input_files().end();
1347 gold_assert(static_cast<unsigned int>(pov
- oview
) == (*p
)->get_offset());
1348 section_offset_type filename_offset
=
1349 strtab
->get_offset_from_key((*p
)->get_filename_key());
1350 const Timespec
& mtime
= (*p
)->get_mtime();
1351 unsigned int flags
= (*p
)->type();
1352 if ((*p
)->is_in_system_directory())
1353 flags
|= INCREMENTAL_INPUT_IN_SYSTEM_DIR
;
1354 if ((*p
)->as_needed())
1355 flags
|= INCREMENTAL_INPUT_AS_NEEDED
;
1356 Swap32::writeval(pov
, filename_offset
);
1357 Swap32::writeval(pov
+ 4, (*p
)->get_info_offset());
1358 Swap64::writeval(pov
+ 8, mtime
.seconds
);
1359 Swap32::writeval(pov
+ 16, mtime
.nanoseconds
);
1360 Swap16::writeval(pov
+ 20, flags
);
1361 Swap16::writeval(pov
+ 22, (*p
)->arg_serial());
1362 pov
+= this->input_entry_size
;
1367 // Write the supplemental information blocks.
1369 template<int size
, bool big_endian
>
1371 Output_section_incremental_inputs
<size
, big_endian
>::write_info_blocks(
1372 unsigned char* oview
,
1375 unsigned int* global_syms
,
1376 unsigned int global_sym_count
)
1378 const Incremental_inputs
* inputs
= this->inputs_
;
1379 unsigned int first_global_index
= this->symtab_
->first_global_index();
1381 for (Incremental_inputs::Input_list::const_iterator p
=
1382 inputs
->input_files().begin();
1383 p
!= inputs
->input_files().end();
1386 switch ((*p
)->type())
1388 case INCREMENTAL_INPUT_SCRIPT
:
1390 gold_assert(static_cast<unsigned int>(pov
- oview
)
1391 == (*p
)->get_info_offset());
1392 Incremental_script_entry
* entry
= (*p
)->script_entry();
1393 gold_assert(entry
!= NULL
);
1395 // Write the object count.
1396 unsigned int nobjects
= entry
->get_object_count();
1397 Swap32::writeval(pov
, nobjects
);
1400 // For each object, write the offset to its input file entry.
1401 for (unsigned int i
= 0; i
< nobjects
; ++i
)
1403 Incremental_input_entry
* obj
= entry
->get_object(i
);
1404 Swap32::writeval(pov
, obj
->get_offset());
1410 case INCREMENTAL_INPUT_OBJECT
:
1411 case INCREMENTAL_INPUT_ARCHIVE_MEMBER
:
1413 gold_assert(static_cast<unsigned int>(pov
- oview
)
1414 == (*p
)->get_info_offset());
1415 Incremental_object_entry
* entry
= (*p
)->object_entry();
1416 gold_assert(entry
!= NULL
);
1417 const Object
* obj
= entry
->object();
1418 const Relobj
* relobj
= static_cast<const Relobj
*>(obj
);
1419 const Object::Symbols
* syms
= obj
->get_global_symbols();
1420 // Write the input section count and global symbol count.
1421 unsigned int nsections
= entry
->get_input_section_count();
1422 unsigned int nsyms
= syms
->size();
1423 off_t locals_offset
= relobj
->local_symbol_offset();
1424 unsigned int nlocals
= relobj
->output_local_symbol_count();
1425 unsigned int first_dynrel
= relobj
->first_dyn_reloc();
1426 unsigned int ndynrel
= relobj
->dyn_reloc_count();
1427 Swap32::writeval(pov
, nsections
);
1428 Swap32::writeval(pov
+ 4, nsyms
);
1429 Swap32::writeval(pov
+ 8, static_cast<unsigned int>(locals_offset
));
1430 Swap32::writeval(pov
+ 12, nlocals
);
1431 Swap32::writeval(pov
+ 16, first_dynrel
);
1432 Swap32::writeval(pov
+ 20, ndynrel
);
1435 // Build a temporary array to map input section indexes
1436 // from the original object file index to the index in the
1437 // incremental info table.
1438 unsigned int* index_map
= new unsigned int[obj
->shnum()];
1439 memset(index_map
, 0, obj
->shnum() * sizeof(unsigned int));
1441 // For each input section, write the name, output section index,
1442 // offset within output section, and input section size.
1443 for (unsigned int i
= 0; i
< nsections
; i
++)
1445 unsigned int shndx
= entry
->get_input_section_index(i
);
1446 index_map
[shndx
] = i
+ 1;
1447 Stringpool::Key key
= entry
->get_input_section_name_key(i
);
1448 off_t name_offset
= 0;
1450 name_offset
= strtab
->get_offset_from_key(key
);
1452 off_t out_offset
= 0;
1454 Output_section
* os
= obj
->output_section(shndx
);
1457 out_shndx
= os
->out_shndx();
1458 out_offset
= obj
->output_section_offset(shndx
);
1459 sh_size
= entry
->get_input_section_size(i
);
1461 Swap32::writeval(pov
, name_offset
);
1462 Swap32::writeval(pov
+ 4, out_shndx
);
1463 Swap::writeval(pov
+ 8, out_offset
);
1464 Swap::writeval(pov
+ 8 + sizeof_addr
, sh_size
);
1465 pov
+= 8 + 2 * sizeof_addr
;
1468 // For each global symbol, write its associated relocations,
1469 // add it to the linked list of globals, then write the
1470 // supplemental information: global symbol table index,
1471 // input section index, linked list chain pointer, relocation
1472 // count, and offset to the relocations.
1473 for (unsigned int i
= 0; i
< nsyms
; i
++)
1475 const Symbol
* sym
= (*syms
)[i
];
1476 if (sym
->is_forwarder())
1477 sym
= this->symtab_
->resolve_forwards(sym
);
1478 unsigned int shndx
= 0;
1479 if (sym
->source() == Symbol::FROM_OBJECT
1480 && sym
->object() == obj
1481 && sym
->is_defined())
1484 unsigned int orig_shndx
= sym
->shndx(&is_ordinary
);
1486 shndx
= index_map
[orig_shndx
];
1488 unsigned int symtab_index
= sym
->symtab_index();
1489 unsigned int chain
= 0;
1490 unsigned int first_reloc
= 0;
1491 unsigned int nrelocs
= obj
->get_incremental_reloc_count(i
);
1494 gold_assert(symtab_index
!= -1U
1495 && (symtab_index
- first_global_index
1496 < global_sym_count
));
1497 first_reloc
= obj
->get_incremental_reloc_base(i
);
1498 chain
= global_syms
[symtab_index
- first_global_index
];
1499 global_syms
[symtab_index
- first_global_index
] =
1502 Swap32::writeval(pov
, symtab_index
);
1503 Swap32::writeval(pov
+ 4, shndx
);
1504 Swap32::writeval(pov
+ 8, chain
);
1505 Swap32::writeval(pov
+ 12, nrelocs
);
1506 Swap32::writeval(pov
+ 16, first_reloc
* 3 * sizeof_addr
);
1514 case INCREMENTAL_INPUT_SHARED_LIBRARY
:
1516 gold_assert(static_cast<unsigned int>(pov
- oview
)
1517 == (*p
)->get_info_offset());
1518 Incremental_dynobj_entry
* entry
= (*p
)->dynobj_entry();
1519 gold_assert(entry
!= NULL
);
1520 const Object
* obj
= entry
->object();
1521 const Object::Symbols
* syms
= obj
->get_global_symbols();
1523 // Write the soname string table index.
1524 section_offset_type soname_offset
=
1525 strtab
->get_offset_from_key(entry
->get_soname_key());
1526 Swap32::writeval(pov
, soname_offset
);
1529 // Skip the global symbol count for now.
1530 unsigned char* orig_pov
= pov
;
1533 // For each global symbol, write the global symbol table index.
1534 unsigned int nsyms
= syms
->size();
1535 unsigned int nsyms_out
= 0;
1536 for (unsigned int i
= 0; i
< nsyms
; i
++)
1538 const Symbol
* sym
= (*syms
)[i
];
1541 if (sym
->is_forwarder())
1542 sym
= this->symtab_
->resolve_forwards(sym
);
1543 if (sym
->symtab_index() == -1U)
1545 unsigned int def_flag
= 0;
1546 if (sym
->source() == Symbol::FROM_OBJECT
1547 && sym
->object() == obj
1548 && sym
->is_defined())
1549 def_flag
= 1U << 31;
1550 Swap32::writeval(pov
, sym
->symtab_index() | def_flag
);
1555 // Now write the global symbol count.
1556 Swap32::writeval(orig_pov
, nsyms_out
);
1560 case INCREMENTAL_INPUT_ARCHIVE
:
1562 gold_assert(static_cast<unsigned int>(pov
- oview
)
1563 == (*p
)->get_info_offset());
1564 Incremental_archive_entry
* entry
= (*p
)->archive_entry();
1565 gold_assert(entry
!= NULL
);
1567 // Write the member count and unused global symbol count.
1568 unsigned int nmembers
= entry
->get_member_count();
1569 unsigned int nsyms
= entry
->get_unused_global_symbol_count();
1570 Swap32::writeval(pov
, nmembers
);
1571 Swap32::writeval(pov
+ 4, nsyms
);
1574 // For each member, write the offset to its input file entry.
1575 for (unsigned int i
= 0; i
< nmembers
; ++i
)
1577 Incremental_object_entry
* member
= entry
->get_member(i
);
1578 Swap32::writeval(pov
, member
->get_offset());
1582 // For each global symbol, write the name offset.
1583 for (unsigned int i
= 0; i
< nsyms
; ++i
)
1585 Stringpool::Key key
= entry
->get_unused_global_symbol(i
);
1586 Swap32::writeval(pov
, strtab
->get_offset_from_key(key
));
1599 // Write the contents of the .gnu_incremental_symtab section.
1601 template<int size
, bool big_endian
>
1603 Output_section_incremental_inputs
<size
, big_endian
>::write_symtab(
1605 unsigned int* global_syms
,
1606 unsigned int global_sym_count
)
1608 for (unsigned int i
= 0; i
< global_sym_count
; ++i
)
1610 Swap32::writeval(pov
, global_syms
[i
]);
1615 // This struct holds the view information needed to write the
1616 // .gnu_incremental_got_plt section.
1618 struct Got_plt_view_info
1620 // Start of the GOT type array in the output view.
1621 unsigned char* got_type_p
;
1622 // Start of the GOT descriptor array in the output view.
1623 unsigned char* got_desc_p
;
1624 // Start of the PLT descriptor array in the output view.
1625 unsigned char* plt_desc_p
;
1626 // Number of GOT entries.
1627 unsigned int got_count
;
1628 // Number of PLT entries.
1629 unsigned int plt_count
;
1630 // Offset of the first non-reserved PLT entry (this is a target-dependent value).
1631 unsigned int first_plt_entry_offset
;
1632 // Size of a PLT entry (this is a target-dependent value).
1633 unsigned int plt_entry_size
;
1634 // Symbol index to write in the GOT descriptor array. For global symbols,
1635 // this is the global symbol table index; for local symbols, it is the
1636 // local symbol table index.
1637 unsigned int sym_index
;
1638 // Input file index to write in the GOT descriptor array. For global
1639 // symbols, this is 0; for local symbols, it is the index of the input
1640 // file entry in the .gnu_incremental_inputs section.
1641 unsigned int input_index
;
1644 // Functor class for processing a GOT offset list for local symbols.
1645 // Writes the GOT type and symbol index into the GOT type and descriptor
1646 // arrays in the output section.
1648 template<int size
, bool big_endian
>
1649 class Local_got_offset_visitor
: public Got_offset_list::Visitor
1652 Local_got_offset_visitor(struct Got_plt_view_info
& info
)
1657 visit(unsigned int got_type
, unsigned int got_offset
)
1659 unsigned int got_index
= got_offset
/ this->got_entry_size_
;
1660 gold_assert(got_index
< this->info_
.got_count
);
1661 // We can only handle GOT entry types in the range 0..0x7e
1662 // because we use a byte array to store them, and we use the
1663 // high bit to flag a local symbol.
1664 gold_assert(got_type
< 0x7f);
1665 this->info_
.got_type_p
[got_index
] = got_type
| 0x80;
1666 unsigned char* pov
= this->info_
.got_desc_p
+ got_index
* 8;
1667 elfcpp::Swap
<32, big_endian
>::writeval(pov
, this->info_
.sym_index
);
1668 elfcpp::Swap
<32, big_endian
>::writeval(pov
+ 4, this->info_
.input_index
);
1672 static const unsigned int got_entry_size_
= size
/ 8;
1673 struct Got_plt_view_info
& info_
;
1676 // Functor class for processing a GOT offset list. Writes the GOT type
1677 // and symbol index into the GOT type and descriptor arrays in the output
1680 template<int size
, bool big_endian
>
1681 class Global_got_offset_visitor
: public Got_offset_list::Visitor
1684 Global_got_offset_visitor(struct Got_plt_view_info
& info
)
1689 visit(unsigned int got_type
, unsigned int got_offset
)
1691 unsigned int got_index
= got_offset
/ this->got_entry_size_
;
1692 gold_assert(got_index
< this->info_
.got_count
);
1693 // We can only handle GOT entry types in the range 0..0x7e
1694 // because we use a byte array to store them, and we use the
1695 // high bit to flag a local symbol.
1696 gold_assert(got_type
< 0x7f);
1697 this->info_
.got_type_p
[got_index
] = got_type
;
1698 unsigned char* pov
= this->info_
.got_desc_p
+ got_index
* 8;
1699 elfcpp::Swap
<32, big_endian
>::writeval(pov
, this->info_
.sym_index
);
1700 elfcpp::Swap
<32, big_endian
>::writeval(pov
+ 4, 0);
1704 static const unsigned int got_entry_size_
= size
/ 8;
1705 struct Got_plt_view_info
& info_
;
1708 // Functor class for processing the global symbol table. Processes the
1709 // GOT offset list for the symbol, and writes the symbol table index
1710 // into the PLT descriptor array in the output section.
1712 template<int size
, bool big_endian
>
1713 class Global_symbol_visitor_got_plt
1716 Global_symbol_visitor_got_plt(struct Got_plt_view_info
& info
)
1721 operator()(const Sized_symbol
<size
>* sym
)
1723 typedef Global_got_offset_visitor
<size
, big_endian
> Got_visitor
;
1724 const Got_offset_list
* got_offsets
= sym
->got_offset_list();
1725 if (got_offsets
!= NULL
)
1727 this->info_
.sym_index
= sym
->symtab_index();
1728 this->info_
.input_index
= 0;
1729 Got_visitor
v(this->info_
);
1730 got_offsets
->for_all_got_offsets(&v
);
1732 if (sym
->has_plt_offset())
1734 unsigned int plt_index
=
1735 ((sym
->plt_offset() - this->info_
.first_plt_entry_offset
)
1736 / this->info_
.plt_entry_size
);
1737 gold_assert(plt_index
< this->info_
.plt_count
);
1738 unsigned char* pov
= this->info_
.plt_desc_p
+ plt_index
* 4;
1739 elfcpp::Swap
<32, big_endian
>::writeval(pov
, sym
->symtab_index());
1744 struct Got_plt_view_info
& info_
;
1747 // Write the contents of the .gnu_incremental_got_plt section.
1749 template<int size
, bool big_endian
>
1751 Output_section_incremental_inputs
<size
, big_endian
>::write_got_plt(
1755 Sized_target
<size
, big_endian
>* target
=
1756 parameters
->sized_target
<size
, big_endian
>();
1758 // Set up the view information for the functors.
1759 struct Got_plt_view_info view_info
;
1760 view_info
.got_count
= target
->got_entry_count();
1761 view_info
.plt_count
= target
->plt_entry_count();
1762 view_info
.first_plt_entry_offset
= target
->first_plt_entry_offset();
1763 view_info
.plt_entry_size
= target
->plt_entry_size();
1764 view_info
.got_type_p
= pov
+ 8;
1765 view_info
.got_desc_p
= (view_info
.got_type_p
1766 + ((view_info
.got_count
+ 3) & ~3));
1767 view_info
.plt_desc_p
= view_info
.got_desc_p
+ view_info
.got_count
* 8;
1769 gold_assert(pov
+ view_size
==
1770 view_info
.plt_desc_p
+ view_info
.plt_count
* 4);
1772 // Write the section header.
1773 Swap32::writeval(pov
, view_info
.got_count
);
1774 Swap32::writeval(pov
+ 4, view_info
.plt_count
);
1776 // Initialize the GOT type array to 0xff (reserved).
1777 memset(view_info
.got_type_p
, 0xff, view_info
.got_count
);
1779 // Write the incremental GOT descriptors for local symbols.
1780 typedef Local_got_offset_visitor
<size
, big_endian
> Got_visitor
;
1781 for (Incremental_inputs::Input_list::const_iterator p
=
1782 this->inputs_
->input_files().begin();
1783 p
!= this->inputs_
->input_files().end();
1786 if ((*p
)->type() != INCREMENTAL_INPUT_OBJECT
1787 && (*p
)->type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER
)
1789 Incremental_object_entry
* entry
= (*p
)->object_entry();
1790 gold_assert(entry
!= NULL
);
1791 const Object
* obj
= entry
->object();
1792 gold_assert(obj
!= NULL
);
1793 view_info
.input_index
= (*p
)->get_file_index();
1794 Got_visitor
v(view_info
);
1795 obj
->for_all_local_got_entries(&v
);
1798 // Write the incremental GOT and PLT descriptors for global symbols.
1799 typedef Global_symbol_visitor_got_plt
<size
, big_endian
> Symbol_visitor
;
1800 symtab_
->for_all_symbols
<size
, Symbol_visitor
>(Symbol_visitor(view_info
));
1803 // Class Sized_relobj_incr. Most of these methods are not used for
1804 // Incremental objects, but are required to be implemented by the
1805 // base class Object.
1807 template<int size
, bool big_endian
>
1808 Sized_relobj_incr
<size
, big_endian
>::Sized_relobj_incr(
1809 const std::string
& name
,
1810 Sized_incremental_binary
<size
, big_endian
>* ibase
,
1811 unsigned int input_file_index
)
1812 : Sized_relobj
<size
, big_endian
>(name
, NULL
), ibase_(ibase
),
1813 input_file_index_(input_file_index
),
1814 input_reader_(ibase
->inputs_reader().input_file(input_file_index
)),
1815 local_symbol_count_(0), output_local_dynsym_count_(0),
1816 local_symbol_index_(0), local_symbol_offset_(0), local_dynsym_offset_(0),
1817 symbols_(), incr_reloc_offset_(-1U), incr_reloc_count_(0),
1818 incr_reloc_output_index_(0), incr_relocs_(NULL
), local_symbols_()
1820 if (this->input_reader_
.is_in_system_directory())
1821 this->set_is_in_system_directory();
1822 const unsigned int shnum
= this->input_reader_
.get_input_section_count() + 1;
1823 this->set_shnum(shnum
);
1824 ibase
->set_input_object(input_file_index
, this);
1827 // Read the symbols.
1829 template<int size
, bool big_endian
>
1831 Sized_relobj_incr
<size
, big_endian
>::do_read_symbols(Read_symbols_data
*)
1836 // Lay out the input sections.
1838 template<int size
, bool big_endian
>
1840 Sized_relobj_incr
<size
, big_endian
>::do_layout(
1845 const unsigned int shnum
= this->shnum();
1846 Incremental_inputs
* incremental_inputs
= layout
->incremental_inputs();
1847 gold_assert(incremental_inputs
!= NULL
);
1848 Output_sections
& out_sections(this->output_sections());
1849 out_sections
.resize(shnum
);
1850 this->section_offsets().resize(shnum
);
1851 for (unsigned int i
= 1; i
< shnum
; i
++)
1853 typename
Input_entry_reader::Input_section_info sect
=
1854 this->input_reader_
.get_input_section(i
- 1);
1855 // Add the section to the incremental inputs layout.
1856 incremental_inputs
->report_input_section(this, i
, sect
.name
,
1858 if (sect
.output_shndx
== 0 || sect
.sh_offset
== -1)
1860 Output_section
* os
= this->ibase_
->output_section(sect
.output_shndx
);
1861 gold_assert(os
!= NULL
);
1862 out_sections
[i
] = os
;
1863 this->section_offsets()[i
] = static_cast<Address
>(sect
.sh_offset
);
1867 // Layout sections whose layout was deferred while waiting for
1868 // input files from a plugin.
1869 template<int size
, bool big_endian
>
1871 Sized_relobj_incr
<size
, big_endian
>::do_layout_deferred_sections(Layout
*)
1875 // Add the symbols to the symbol table.
1877 template<int size
, bool big_endian
>
1879 Sized_relobj_incr
<size
, big_endian
>::do_add_symbols(
1880 Symbol_table
* symtab
,
1884 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1885 unsigned char symbuf
[sym_size
];
1886 elfcpp::Sym
<size
, big_endian
> sym(symbuf
);
1887 elfcpp::Sym_write
<size
, big_endian
> osym(symbuf
);
1889 typedef typename
elfcpp::Elf_types
<size
>::Elf_WXword Elf_size_type
;
1891 unsigned int nsyms
= this->input_reader_
.get_global_symbol_count();
1892 this->symbols_
.resize(nsyms
);
1894 Incremental_binary::View
symtab_view(NULL
);
1895 unsigned int symtab_count
;
1896 elfcpp::Elf_strtab
strtab(NULL
, 0);
1897 this->ibase_
->get_symtab_view(&symtab_view
, &symtab_count
, &strtab
);
1899 Incremental_symtab_reader
<big_endian
> isymtab(this->ibase_
->symtab_reader());
1900 unsigned int isym_count
= isymtab
.symbol_count();
1901 unsigned int first_global
= symtab_count
- isym_count
;
1903 const unsigned char* sym_p
;
1904 for (unsigned int i
= 0; i
< nsyms
; ++i
)
1906 Incremental_global_symbol_reader
<big_endian
> info
=
1907 this->input_reader_
.get_global_symbol_reader(i
);
1908 unsigned int output_symndx
= info
.output_symndx();
1909 sym_p
= symtab_view
.data() + output_symndx
* sym_size
;
1910 elfcpp::Sym
<size
, big_endian
> gsym(sym_p
);
1912 if (!strtab
.get_c_string(gsym
.get_st_name(), &name
))
1915 typename
elfcpp::Elf_types
<size
>::Elf_Addr v
= gsym
.get_st_value();
1916 unsigned int shndx
= gsym
.get_st_shndx();
1917 elfcpp::STB st_bind
= gsym
.get_st_bind();
1918 elfcpp::STT st_type
= gsym
.get_st_type();
1920 // Local hidden symbols start out as globals, but get converted to
1921 // to local during output.
1922 if (st_bind
== elfcpp::STB_LOCAL
)
1923 st_bind
= elfcpp::STB_GLOBAL
;
1925 unsigned int input_shndx
= info
.shndx();
1926 if (input_shndx
== 0)
1928 shndx
= elfcpp::SHN_UNDEF
;
1931 else if (shndx
!= elfcpp::SHN_ABS
)
1933 // Find the input section and calculate the section-relative value.
1934 gold_assert(shndx
!= elfcpp::SHN_UNDEF
);
1935 Output_section
* os
= this->ibase_
->output_section(shndx
);
1936 gold_assert(os
!= NULL
&& os
->has_fixed_layout());
1937 typename
Input_entry_reader::Input_section_info sect
=
1938 this->input_reader_
.get_input_section(input_shndx
- 1);
1939 gold_assert(sect
.output_shndx
== shndx
);
1940 if (st_type
!= elfcpp::STT_TLS
)
1942 v
-= sect
.sh_offset
;
1943 shndx
= input_shndx
;
1946 osym
.put_st_name(0);
1947 osym
.put_st_value(v
);
1948 osym
.put_st_size(gsym
.get_st_size());
1949 osym
.put_st_info(st_bind
, st_type
);
1950 osym
.put_st_other(gsym
.get_st_other());
1951 osym
.put_st_shndx(shndx
);
1954 symtab
->add_from_incrobj(this, name
, NULL
, &sym
);
1955 this->ibase_
->add_global_symbol(output_symndx
- first_global
,
1960 // Return TRUE if we should include this object from an archive library.
1962 template<int size
, bool big_endian
>
1963 Archive::Should_include
1964 Sized_relobj_incr
<size
, big_endian
>::do_should_include_member(
1973 // Iterate over global symbols, calling a visitor class V for each.
1975 template<int size
, bool big_endian
>
1977 Sized_relobj_incr
<size
, big_endian
>::do_for_all_global_symbols(
1979 Library_base::Symbol_visitor_base
*)
1981 // This routine is not used for incremental objects.
1984 // Get the size of a section.
1986 template<int size
, bool big_endian
>
1988 Sized_relobj_incr
<size
, big_endian
>::do_section_size(unsigned int)
1993 // Get the name of a section.
1995 template<int size
, bool big_endian
>
1997 Sized_relobj_incr
<size
, big_endian
>::do_section_name(unsigned int)
2002 // Return a view of the contents of a section.
2004 template<int size
, bool big_endian
>
2006 Sized_relobj_incr
<size
, big_endian
>::do_section_contents(unsigned int)
2011 // Return section flags.
2013 template<int size
, bool big_endian
>
2015 Sized_relobj_incr
<size
, big_endian
>::do_section_flags(unsigned int)
2020 // Return section entsize.
2022 template<int size
, bool big_endian
>
2024 Sized_relobj_incr
<size
, big_endian
>::do_section_entsize(unsigned int)
2029 // Return section address.
2031 template<int size
, bool big_endian
>
2033 Sized_relobj_incr
<size
, big_endian
>::do_section_address(unsigned int)
2038 // Return section type.
2040 template<int size
, bool big_endian
>
2042 Sized_relobj_incr
<size
, big_endian
>::do_section_type(unsigned int)
2047 // Return the section link field.
2049 template<int size
, bool big_endian
>
2051 Sized_relobj_incr
<size
, big_endian
>::do_section_link(unsigned int)
2056 // Return the section link field.
2058 template<int size
, bool big_endian
>
2060 Sized_relobj_incr
<size
, big_endian
>::do_section_info(unsigned int)
2065 // Return the section alignment.
2067 template<int size
, bool big_endian
>
2069 Sized_relobj_incr
<size
, big_endian
>::do_section_addralign(unsigned int)
2074 // Return the Xindex structure to use.
2076 template<int size
, bool big_endian
>
2078 Sized_relobj_incr
<size
, big_endian
>::do_initialize_xindex()
2083 // Get symbol counts.
2085 template<int size
, bool big_endian
>
2087 Sized_relobj_incr
<size
, big_endian
>::do_get_global_symbol_counts(
2088 const Symbol_table
*, size_t*, size_t*) const
2095 template<int size
, bool big_endian
>
2097 Sized_relobj_incr
<size
, big_endian
>::do_read_relocs(Read_relocs_data
*)
2101 // Process the relocs to find list of referenced sections. Used only
2102 // during garbage collection.
2104 template<int size
, bool big_endian
>
2106 Sized_relobj_incr
<size
, big_endian
>::do_gc_process_relocs(Symbol_table
*,
2113 // Scan the relocs and adjust the symbol table.
2115 template<int size
, bool big_endian
>
2117 Sized_relobj_incr
<size
, big_endian
>::do_scan_relocs(Symbol_table
*,
2121 // Count the incremental relocations for this object.
2122 unsigned int nsyms
= this->input_reader_
.get_global_symbol_count();
2123 this->allocate_incremental_reloc_counts();
2124 for (unsigned int i
= 0; i
< nsyms
; i
++)
2126 Incremental_global_symbol_reader
<big_endian
> sym
=
2127 this->input_reader_
.get_global_symbol_reader(i
);
2128 unsigned int reloc_count
= sym
.reloc_count();
2129 if (reloc_count
> 0 && this->incr_reloc_offset_
== -1U)
2130 this->incr_reloc_offset_
= sym
.reloc_offset();
2131 this->incr_reloc_count_
+= reloc_count
;
2132 for (unsigned int j
= 0; j
< reloc_count
; j
++)
2133 this->count_incremental_reloc(i
);
2135 this->incr_reloc_output_index_
=
2136 layout
->incremental_inputs()->get_reloc_count();
2137 this->finalize_incremental_relocs(layout
, false);
2139 // The incoming incremental relocations may not end up in the same
2140 // location after the incremental update, because the incremental info
2141 // is regenerated in each link. Because the new location may overlap
2142 // with other data in the updated output file, we need to copy the
2143 // relocations into a buffer so that we can still read them safely
2144 // after we start writing updates to the output file.
2145 if (this->incr_reloc_count_
> 0)
2147 const Incremental_relocs_reader
<size
, big_endian
>& relocs_reader
=
2148 this->ibase_
->relocs_reader();
2149 const unsigned int incr_reloc_size
= relocs_reader
.reloc_size
;
2150 unsigned int len
= this->incr_reloc_count_
* incr_reloc_size
;
2151 this->incr_relocs_
= new unsigned char[len
];
2152 memcpy(this->incr_relocs_
,
2153 relocs_reader
.data(this->incr_reloc_offset_
),
2158 // Count the local symbols.
2160 template<int size
, bool big_endian
>
2162 Sized_relobj_incr
<size
, big_endian
>::do_count_local_symbols(
2163 Stringpool_template
<char>* pool
,
2164 Stringpool_template
<char>*)
2166 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2168 // Set the count of local symbols based on the incremental info.
2169 unsigned int nlocals
= this->input_reader_
.get_local_symbol_count();
2170 this->local_symbol_count_
= nlocals
;
2171 this->local_symbols_
.reserve(nlocals
);
2173 // Get views of the base file's symbol table and string table.
2174 Incremental_binary::View
symtab_view(NULL
);
2175 unsigned int symtab_count
;
2176 elfcpp::Elf_strtab
strtab(NULL
, 0);
2177 this->ibase_
->get_symtab_view(&symtab_view
, &symtab_count
, &strtab
);
2179 // Read the local symbols from the base file's symbol table.
2180 off_t off
= this->input_reader_
.get_local_symbol_offset();
2181 const unsigned char* symp
= symtab_view
.data() + off
;
2182 for (unsigned int i
= 0; i
< nlocals
; ++i
, symp
+= sym_size
)
2184 elfcpp::Sym
<size
, big_endian
> sym(symp
);
2186 if (!strtab
.get_c_string(sym
.get_st_name(), &name
))
2188 gold_debug(DEBUG_INCREMENTAL
, "Local symbol %d: %s", i
, name
);
2189 name
= pool
->add(name
, true, NULL
);
2190 this->local_symbols_
.push_back(Local_symbol(name
,
2199 // Finalize the local symbols.
2201 template<int size
, bool big_endian
>
2203 Sized_relobj_incr
<size
, big_endian
>::do_finalize_local_symbols(
2208 this->local_symbol_index_
= index
;
2209 this->local_symbol_offset_
= off
;
2210 return index
+ this->local_symbol_count_
;
2213 // Set the offset where local dynamic symbol information will be stored.
2215 template<int size
, bool big_endian
>
2217 Sized_relobj_incr
<size
, big_endian
>::do_set_local_dynsym_indexes(
2220 // FIXME: set local dynsym indexes.
2224 // Set the offset where local dynamic symbol information will be stored.
2226 template<int size
, bool big_endian
>
2228 Sized_relobj_incr
<size
, big_endian
>::do_set_local_dynsym_offset(off_t
)
2233 // Relocate the input sections and write out the local symbols.
2234 // We don't actually do any relocation here. For unchanged input files,
2235 // we reapply relocations only for symbols that have changed; that happens
2236 // in queue_final_tasks. We do need to rewrite the incremental relocations
2239 template<int size
, bool big_endian
>
2241 Sized_relobj_incr
<size
, big_endian
>::do_relocate(const Symbol_table
*,
2242 const Layout
* layout
,
2245 if (this->incr_reloc_count_
== 0)
2248 const unsigned int incr_reloc_size
=
2249 Incremental_relocs_reader
<size
, big_endian
>::reloc_size
;
2251 // Get a view for the .gnu_incremental_relocs section.
2252 Incremental_inputs
* inputs
= layout
->incremental_inputs();
2253 gold_assert(inputs
!= NULL
);
2254 const off_t relocs_off
= inputs
->relocs_section()->offset();
2255 const off_t relocs_size
= inputs
->relocs_section()->data_size();
2256 unsigned char* const view
= of
->get_output_view(relocs_off
, relocs_size
);
2258 // Copy the relocations from the buffer.
2259 off_t off
= this->incr_reloc_output_index_
* incr_reloc_size
;
2260 unsigned int len
= this->incr_reloc_count_
* incr_reloc_size
;
2261 memcpy(view
+ off
, this->incr_relocs_
, len
);
2263 // The output section table may have changed, so we need to map
2264 // the old section index to the new section index for each relocation.
2265 for (unsigned int i
= 0; i
< this->incr_reloc_count_
; ++i
)
2267 unsigned char* pov
= view
+ off
+ i
* incr_reloc_size
;
2268 unsigned int shndx
= elfcpp::Swap
<32, big_endian
>::readval(pov
+ 4);
2269 Output_section
* os
= this->ibase_
->output_section(shndx
);
2270 gold_assert(os
!= NULL
);
2271 shndx
= os
->out_shndx();
2272 elfcpp::Swap
<32, big_endian
>::writeval(pov
+ 4, shndx
);
2275 of
->write_output_view(off
, len
, view
);
2277 // Get views into the output file for the portions of the symbol table
2278 // and the dynamic symbol table that we will be writing.
2279 off_t symtab_off
= layout
->symtab_section()->offset();
2280 off_t output_size
= this->local_symbol_count_
* This::sym_size
;
2281 unsigned char* oview
= NULL
;
2282 if (output_size
> 0)
2283 oview
= of
->get_output_view(symtab_off
+ this->local_symbol_offset_
,
2286 off_t dyn_output_size
= this->output_local_dynsym_count_
* sym_size
;
2287 unsigned char* dyn_oview
= NULL
;
2288 if (dyn_output_size
> 0)
2289 dyn_oview
= of
->get_output_view(this->local_dynsym_offset_
,
2292 // Write the local symbols.
2293 unsigned char* ov
= oview
;
2294 unsigned char* dyn_ov
= dyn_oview
;
2295 const Stringpool
* sympool
= layout
->sympool();
2296 const Stringpool
* dynpool
= layout
->dynpool();
2297 Output_symtab_xindex
* symtab_xindex
= layout
->symtab_xindex();
2298 Output_symtab_xindex
* dynsym_xindex
= layout
->dynsym_xindex();
2299 for (unsigned int i
= 0; i
< this->local_symbol_count_
; ++i
)
2301 Local_symbol
& lsym(this->local_symbols_
[i
]);
2304 unsigned int st_shndx
= this->adjust_sym_shndx(i
, lsym
.st_shndx
,
2308 Output_section
* os
= this->ibase_
->output_section(st_shndx
);
2309 st_shndx
= os
->out_shndx();
2310 if (st_shndx
>= elfcpp::SHN_LORESERVE
)
2312 symtab_xindex
->add(this->local_symbol_index_
+ i
, st_shndx
);
2313 if (lsym
.needs_dynsym_entry
)
2314 dynsym_xindex
->add(lsym
.output_dynsym_index
, st_shndx
);
2315 st_shndx
= elfcpp::SHN_XINDEX
;
2319 // Write the symbol to the output symbol table.
2321 elfcpp::Sym_write
<size
, big_endian
> osym(ov
);
2322 osym
.put_st_name(sympool
->get_offset(lsym
.name
));
2323 osym
.put_st_value(lsym
.st_value
);
2324 osym
.put_st_size(lsym
.st_size
);
2325 osym
.put_st_info(elfcpp::STB_LOCAL
,
2326 static_cast<elfcpp::STT
>(lsym
.st_type
));
2327 osym
.put_st_other(0);
2328 osym
.put_st_shndx(st_shndx
);
2332 // Write the symbol to the output dynamic symbol table.
2333 if (lsym
.needs_dynsym_entry
)
2335 gold_assert(dyn_ov
< dyn_oview
+ dyn_output_size
);
2336 elfcpp::Sym_write
<size
, big_endian
> osym(dyn_ov
);
2337 osym
.put_st_name(dynpool
->get_offset(lsym
.name
));
2338 osym
.put_st_value(lsym
.st_value
);
2339 osym
.put_st_size(lsym
.st_size
);
2340 osym
.put_st_info(elfcpp::STB_LOCAL
,
2341 static_cast<elfcpp::STT
>(lsym
.st_type
));
2342 osym
.put_st_other(0);
2343 osym
.put_st_shndx(st_shndx
);
2348 if (output_size
> 0)
2350 gold_assert(ov
- oview
== output_size
);
2351 of
->write_output_view(symtab_off
+ this->local_symbol_offset_
,
2352 output_size
, oview
);
2355 if (dyn_output_size
> 0)
2357 gold_assert(dyn_ov
- dyn_oview
== dyn_output_size
);
2358 of
->write_output_view(this->local_dynsym_offset_
, dyn_output_size
,
2363 // Set the offset of a section.
2365 template<int size
, bool big_endian
>
2367 Sized_relobj_incr
<size
, big_endian
>::do_set_section_offset(unsigned int,
2372 // Class Sized_incr_dynobj. Most of these methods are not used for
2373 // Incremental objects, but are required to be implemented by the
2374 // base class Object.
2376 template<int size
, bool big_endian
>
2377 Sized_incr_dynobj
<size
, big_endian
>::Sized_incr_dynobj(
2378 const std::string
& name
,
2379 Sized_incremental_binary
<size
, big_endian
>* ibase
,
2380 unsigned int input_file_index
)
2381 : Dynobj(name
, NULL
), ibase_(ibase
),
2382 input_file_index_(input_file_index
),
2383 input_reader_(ibase
->inputs_reader().input_file(input_file_index
)),
2386 if (this->input_reader_
.is_in_system_directory())
2387 this->set_is_in_system_directory();
2388 if (this->input_reader_
.as_needed())
2389 this->set_as_needed();
2390 this->set_soname_string(this->input_reader_
.get_soname());
2394 // Read the symbols.
2396 template<int size
, bool big_endian
>
2398 Sized_incr_dynobj
<size
, big_endian
>::do_read_symbols(Read_symbols_data
*)
2403 // Lay out the input sections.
2405 template<int size
, bool big_endian
>
2407 Sized_incr_dynobj
<size
, big_endian
>::do_layout(
2414 // Add the symbols to the symbol table.
2416 template<int size
, bool big_endian
>
2418 Sized_incr_dynobj
<size
, big_endian
>::do_add_symbols(
2419 Symbol_table
* symtab
,
2423 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2424 unsigned char symbuf
[sym_size
];
2425 elfcpp::Sym
<size
, big_endian
> sym(symbuf
);
2426 elfcpp::Sym_write
<size
, big_endian
> osym(symbuf
);
2428 typedef typename
elfcpp::Elf_types
<size
>::Elf_WXword Elf_size_type
;
2430 unsigned int nsyms
= this->input_reader_
.get_global_symbol_count();
2431 this->symbols_
.resize(nsyms
);
2433 Incremental_binary::View
symtab_view(NULL
);
2434 unsigned int symtab_count
;
2435 elfcpp::Elf_strtab
strtab(NULL
, 0);
2436 this->ibase_
->get_symtab_view(&symtab_view
, &symtab_count
, &strtab
);
2438 Incremental_symtab_reader
<big_endian
> isymtab(this->ibase_
->symtab_reader());
2439 unsigned int isym_count
= isymtab
.symbol_count();
2440 unsigned int first_global
= symtab_count
- isym_count
;
2442 const unsigned char* sym_p
;
2443 for (unsigned int i
= 0; i
< nsyms
; ++i
)
2446 unsigned int output_symndx
=
2447 this->input_reader_
.get_output_symbol_index(i
, &is_def
);
2448 sym_p
= symtab_view
.data() + output_symndx
* sym_size
;
2449 elfcpp::Sym
<size
, big_endian
> gsym(sym_p
);
2451 if (!strtab
.get_c_string(gsym
.get_st_name(), &name
))
2454 typename
elfcpp::Elf_types
<size
>::Elf_Addr v
;
2456 elfcpp::STB st_bind
= gsym
.get_st_bind();
2457 elfcpp::STT st_type
= gsym
.get_st_type();
2459 // Local hidden symbols start out as globals, but get converted to
2460 // to local during output.
2461 if (st_bind
== elfcpp::STB_LOCAL
)
2462 st_bind
= elfcpp::STB_GLOBAL
;
2466 shndx
= elfcpp::SHN_UNDEF
;
2471 // For a symbol defined in a shared object, the section index
2472 // is meaningless, as long as it's not SHN_UNDEF.
2474 v
= gsym
.get_st_value();
2477 osym
.put_st_name(0);
2478 osym
.put_st_value(v
);
2479 osym
.put_st_size(gsym
.get_st_size());
2480 osym
.put_st_info(st_bind
, st_type
);
2481 osym
.put_st_other(gsym
.get_st_other());
2482 osym
.put_st_shndx(shndx
);
2485 symtab
->add_from_incrobj
<size
, big_endian
>(this, name
, NULL
, &sym
);
2486 this->ibase_
->add_global_symbol(output_symndx
- first_global
,
2491 // Return TRUE if we should include this object from an archive library.
2493 template<int size
, bool big_endian
>
2494 Archive::Should_include
2495 Sized_incr_dynobj
<size
, big_endian
>::do_should_include_member(
2504 // Iterate over global symbols, calling a visitor class V for each.
2506 template<int size
, bool big_endian
>
2508 Sized_incr_dynobj
<size
, big_endian
>::do_for_all_global_symbols(
2510 Library_base::Symbol_visitor_base
*)
2512 // This routine is not used for dynamic libraries.
2515 // Iterate over local symbols, calling a visitor class V for each GOT offset
2516 // associated with a local symbol.
2518 template<int size
, bool big_endian
>
2520 Sized_incr_dynobj
<size
, big_endian
>::do_for_all_local_got_entries(
2521 Got_offset_list::Visitor
*) const
2525 // Get the size of a section.
2527 template<int size
, bool big_endian
>
2529 Sized_incr_dynobj
<size
, big_endian
>::do_section_size(unsigned int)
2534 // Get the name of a section.
2536 template<int size
, bool big_endian
>
2538 Sized_incr_dynobj
<size
, big_endian
>::do_section_name(unsigned int)
2543 // Return a view of the contents of a section.
2545 template<int size
, bool big_endian
>
2547 Sized_incr_dynobj
<size
, big_endian
>::do_section_contents(unsigned int)
2552 // Return section flags.
2554 template<int size
, bool big_endian
>
2556 Sized_incr_dynobj
<size
, big_endian
>::do_section_flags(unsigned int)
2561 // Return section entsize.
2563 template<int size
, bool big_endian
>
2565 Sized_incr_dynobj
<size
, big_endian
>::do_section_entsize(unsigned int)
2570 // Return section address.
2572 template<int size
, bool big_endian
>
2574 Sized_incr_dynobj
<size
, big_endian
>::do_section_address(unsigned int)
2579 // Return section type.
2581 template<int size
, bool big_endian
>
2583 Sized_incr_dynobj
<size
, big_endian
>::do_section_type(unsigned int)
2588 // Return the section link field.
2590 template<int size
, bool big_endian
>
2592 Sized_incr_dynobj
<size
, big_endian
>::do_section_link(unsigned int)
2597 // Return the section link field.
2599 template<int size
, bool big_endian
>
2601 Sized_incr_dynobj
<size
, big_endian
>::do_section_info(unsigned int)
2606 // Return the section alignment.
2608 template<int size
, bool big_endian
>
2610 Sized_incr_dynobj
<size
, big_endian
>::do_section_addralign(unsigned int)
2615 // Return the Xindex structure to use.
2617 template<int size
, bool big_endian
>
2619 Sized_incr_dynobj
<size
, big_endian
>::do_initialize_xindex()
2624 // Get symbol counts.
2626 template<int size
, bool big_endian
>
2628 Sized_incr_dynobj
<size
, big_endian
>::do_get_global_symbol_counts(
2629 const Symbol_table
*, size_t*, size_t*) const
2634 // Allocate an incremental object of the appropriate size and endianness.
2637 make_sized_incremental_object(
2638 Incremental_binary
* ibase
,
2639 unsigned int input_file_index
,
2640 Incremental_input_type input_type
,
2641 const Incremental_binary::Input_reader
* input_reader
)
2644 std::string
name(input_reader
->filename());
2646 switch (parameters
->size_and_endianness())
2648 #ifdef HAVE_TARGET_32_LITTLE
2649 case Parameters::TARGET_32_LITTLE
:
2651 Sized_incremental_binary
<32, false>* sized_ibase
=
2652 static_cast<Sized_incremental_binary
<32, false>*>(ibase
);
2653 if (input_type
== INCREMENTAL_INPUT_SHARED_LIBRARY
)
2654 obj
= new Sized_incr_dynobj
<32, false>(name
, sized_ibase
,
2657 obj
= new Sized_relobj_incr
<32, false>(name
, sized_ibase
,
2662 #ifdef HAVE_TARGET_32_BIG
2663 case Parameters::TARGET_32_BIG
:
2665 Sized_incremental_binary
<32, true>* sized_ibase
=
2666 static_cast<Sized_incremental_binary
<32, true>*>(ibase
);
2667 if (input_type
== INCREMENTAL_INPUT_SHARED_LIBRARY
)
2668 obj
= new Sized_incr_dynobj
<32, true>(name
, sized_ibase
,
2671 obj
= new Sized_relobj_incr
<32, true>(name
, sized_ibase
,
2676 #ifdef HAVE_TARGET_64_LITTLE
2677 case Parameters::TARGET_64_LITTLE
:
2679 Sized_incremental_binary
<64, false>* sized_ibase
=
2680 static_cast<Sized_incremental_binary
<64, false>*>(ibase
);
2681 if (input_type
== INCREMENTAL_INPUT_SHARED_LIBRARY
)
2682 obj
= new Sized_incr_dynobj
<64, false>(name
, sized_ibase
,
2685 obj
= new Sized_relobj_incr
<64, false>(name
, sized_ibase
,
2690 #ifdef HAVE_TARGET_64_BIG
2691 case Parameters::TARGET_64_BIG
:
2693 Sized_incremental_binary
<64, true>* sized_ibase
=
2694 static_cast<Sized_incremental_binary
<64, true>*>(ibase
);
2695 if (input_type
== INCREMENTAL_INPUT_SHARED_LIBRARY
)
2696 obj
= new Sized_incr_dynobj
<64, true>(name
, sized_ibase
,
2699 obj
= new Sized_relobj_incr
<64, true>(name
, sized_ibase
,
2708 gold_assert(obj
!= NULL
);
2712 // Copy the unused symbols from the incremental input info.
2713 // We need to do this because we may be overwriting the incremental
2714 // input info in the base file before we write the new incremental
2717 Incremental_library::copy_unused_symbols()
2719 unsigned int symcount
= this->input_reader_
->get_unused_symbol_count();
2720 this->unused_symbols_
.reserve(symcount
);
2721 for (unsigned int i
= 0; i
< symcount
; ++i
)
2723 std::string
name(this->input_reader_
->get_unused_symbol(i
));
2724 this->unused_symbols_
.push_back(name
);
2728 // Iterator for unused global symbols in the library.
2730 Incremental_library::do_for_all_unused_symbols(Symbol_visitor_base
* v
) const
2732 for (Symbol_list::const_iterator p
= this->unused_symbols_
.begin();
2733 p
!= this->unused_symbols_
.end();
2735 v
->visit(p
->c_str());
2738 // Instantiate the templates we need.
2740 #ifdef HAVE_TARGET_32_LITTLE
2742 class Sized_incremental_binary
<32, false>;
2745 class Sized_relobj_incr
<32, false>;
2748 class Sized_incr_dynobj
<32, false>;
2751 #ifdef HAVE_TARGET_32_BIG
2753 class Sized_incremental_binary
<32, true>;
2756 class Sized_relobj_incr
<32, true>;
2759 class Sized_incr_dynobj
<32, true>;
2762 #ifdef HAVE_TARGET_64_LITTLE
2764 class Sized_incremental_binary
<64, false>;
2767 class Sized_relobj_incr
<64, false>;
2770 class Sized_incr_dynobj
<64, false>;
2773 #ifdef HAVE_TARGET_64_BIG
2775 class Sized_incremental_binary
<64, true>;
2778 class Sized_relobj_incr
<64, true>;
2781 class Sized_incr_dynobj
<64, true>;
2784 } // End namespace gold.