1 // inremental.h -- incremental linking support for gold -*- C++ -*-
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.
23 #ifndef GOLD_INCREMENTAL_H
24 #define GOLD_INCREMENTAL_H
29 #include "elfcpp_file.h"
30 #include "stringpool.h"
31 #include "workqueue.h"
40 class Incremental_inputs_checker
;
41 class Incremental_script_entry
;
42 class Incremental_object_entry
;
43 class Incremental_dynobj_entry
;
44 class Incremental_archive_entry
;
45 class Incremental_inputs
;
46 class Incremental_binary
;
47 class Incremental_library
;
50 // Incremental input type as stored in .gnu_incremental_inputs.
52 enum Incremental_input_type
54 INCREMENTAL_INPUT_OBJECT
= 1,
55 INCREMENTAL_INPUT_ARCHIVE_MEMBER
= 2,
56 INCREMENTAL_INPUT_ARCHIVE
= 3,
57 INCREMENTAL_INPUT_SHARED_LIBRARY
= 4,
58 INCREMENTAL_INPUT_SCRIPT
= 5
61 // Incremental input file flags.
62 // The input file type is stored in the lower eight bits.
64 enum Incremental_input_flags
66 INCREMENTAL_INPUT_IN_SYSTEM_DIR
= 0x8000,
67 INCREMENTAL_INPUT_AS_NEEDED
= 0x4000
70 // Symbol flags for the incremental symbol table.
71 // These flags are stored in the top two bits of
72 // the symbol index field.
74 enum Incremental_shlib_symbol_flags
76 // Symbol is defined in this library.
77 INCREMENTAL_SHLIB_SYM_DEF
= 2,
78 // Symbol is defined in this library, with a COPY relocation.
79 INCREMENTAL_SHLIB_SYM_COPY
= 3
82 static const int INCREMENTAL_SHLIB_SYM_FLAGS_SHIFT
= 30;
84 // Create an Incremental_binary object for FILE. Returns NULL is this is not
85 // possible, e.g. FILE is not an ELF file or has an unsupported target.
88 open_incremental_binary(Output_file
* file
);
90 // Base class for recording each input file.
92 class Incremental_input_entry
95 Incremental_input_entry(Stringpool::Key filename_key
, unsigned int arg_serial
,
97 : filename_key_(filename_key
), file_index_(0), offset_(0), info_offset_(0),
98 arg_serial_(arg_serial
), mtime_(mtime
), is_in_system_directory_(false),
103 ~Incremental_input_entry()
106 // Return the type of input file.
107 Incremental_input_type
109 { return this->do_type(); }
111 // Set the index and section offset of this input file entry.
113 set_offset(unsigned int file_index
, unsigned int offset
)
115 this->file_index_
= file_index
;
116 this->offset_
= offset
;
119 // Set the section offset of the supplemental information for this entry.
121 set_info_offset(unsigned int info_offset
)
122 { this->info_offset_
= info_offset
; }
124 // Get the index of this input file entry.
126 get_file_index() const
127 { return this->file_index_
; }
129 // Get the section offset of this input file entry.
132 { return this->offset_
; }
134 // Get the section offset of the supplemental information for this entry.
136 get_info_offset() const
137 { return this->info_offset_
; }
139 // Get the stringpool key for the input filename.
141 get_filename_key() const
142 { return this->filename_key_
; }
144 // Get the serial number of the input file.
147 { return this->arg_serial_
; }
149 // Get the modification time of the input file.
152 { return this->mtime_
; }
154 // Record that the file was found in a system directory.
156 set_is_in_system_directory()
157 { this->is_in_system_directory_
= true; }
159 // Return TRUE if the file was found in a system directory.
161 is_in_system_directory() const
162 { return this->is_in_system_directory_
; }
164 // Record that the file was linked with --as-needed.
167 { this->as_needed_
= true; }
169 // Return TRUE if the file was linked with --as-needed.
172 { return this->as_needed_
; }
174 // Return a pointer to the derived Incremental_script_entry object.
175 // Return NULL for input entries that are not script files.
176 Incremental_script_entry
*
178 { return this->do_script_entry(); }
180 // Return a pointer to the derived Incremental_object_entry object.
181 // Return NULL for input entries that are not object files.
182 Incremental_object_entry
*
184 { return this->do_object_entry(); }
186 // Return a pointer to the derived Incremental_dynobj_entry object.
187 // Return NULL for input entries that are not shared object files.
188 Incremental_dynobj_entry
*
190 { return this->do_dynobj_entry(); }
192 // Return a pointer to the derived Incremental_archive_entry object.
193 // Return NULL for input entries that are not archive files.
194 Incremental_archive_entry
*
196 { return this->do_archive_entry(); }
199 // Return the type of input file.
200 virtual Incremental_input_type
203 // Return a pointer to the derived Incremental_script_entry object.
204 // Return NULL for input entries that are not script files.
205 virtual Incremental_script_entry
*
209 // Return a pointer to the derived Incremental_object_entry object.
210 // Return NULL for input entries that are not object files.
211 virtual Incremental_object_entry
*
215 // Return a pointer to the derived Incremental_dynobj_entry object.
216 // Return NULL for input entries that are not shared object files.
217 virtual Incremental_dynobj_entry
*
221 // Return a pointer to the derived Incremental_archive_entry object.
222 // Return NULL for input entries that are not archive files.
223 virtual Incremental_archive_entry
*
228 // Key of the filename string in the section stringtable.
229 Stringpool::Key filename_key_
;
231 // Index of the entry in the output section.
232 unsigned int file_index_
;
234 // Offset of the entry in the output section.
235 unsigned int offset_
;
237 // Offset of the extra information in the output section.
238 unsigned int info_offset_
;
240 // Serial number of the file in the argument list.
241 unsigned int arg_serial_
;
243 // Last modification time of the file.
246 // TRUE if the file was found in a system directory.
247 bool is_in_system_directory_
;
249 // TRUE if the file was linked with --as-needed.
253 // Information about a script input that will persist during the whole linker
254 // run. Needed only during an incremental build to retrieve the input files
255 // added by this script.
260 Script_info(const std::string
& filename
)
261 : filename_(filename
), input_file_index_(0),
262 incremental_script_entry_(NULL
)
265 Script_info(const std::string
& filename
, unsigned int input_file_index
)
266 : filename_(filename
), input_file_index_(input_file_index
),
267 incremental_script_entry_(NULL
)
270 // Store a pointer to the incremental information for this script.
272 set_incremental_info(Incremental_script_entry
* entry
)
273 { this->incremental_script_entry_
= entry
; }
275 // Return the filename.
278 { return this->filename_
; }
280 // Return the input file index.
282 input_file_index() const
283 { return this->input_file_index_
; }
285 // Return the pointer to the incremental information for this script.
286 Incremental_script_entry
*
287 incremental_info() const
288 { return this->incremental_script_entry_
; }
291 const std::string filename_
;
292 unsigned int input_file_index_
;
293 Incremental_script_entry
* incremental_script_entry_
;
296 // Class for recording input scripts.
298 class Incremental_script_entry
: public Incremental_input_entry
301 Incremental_script_entry(Stringpool::Key filename_key
,
302 unsigned int arg_serial
, Script_info
* script
,
304 : Incremental_input_entry(filename_key
, arg_serial
, mtime
),
305 script_(script
), objects_()
308 // Add a member object to the archive.
310 add_object(Incremental_input_entry
* obj_entry
)
312 this->objects_
.push_back(obj_entry
);
315 // Return the number of objects included by this script.
318 { return this->objects_
.size(); }
320 // Return the Nth object.
321 Incremental_input_entry
*
322 get_object(unsigned int n
)
324 gold_assert(n
< this->objects_
.size());
325 return this->objects_
[n
];
329 virtual Incremental_input_type
331 { return INCREMENTAL_INPUT_SCRIPT
; }
333 // Return a pointer to the derived Incremental_script_entry object.
334 virtual Incremental_script_entry
*
339 // Information about the script file.
340 Script_info
* script_
;
341 // Objects that have been included by this script.
342 std::vector
<Incremental_input_entry
*> objects_
;
345 // Class for recording input object files.
347 class Incremental_object_entry
: public Incremental_input_entry
350 Incremental_object_entry(Stringpool::Key filename_key
, Object
* obj
,
351 unsigned int arg_serial
, Timespec mtime
)
352 : Incremental_input_entry(filename_key
, arg_serial
, mtime
), obj_(obj
),
353 is_member_(false), sections_(), groups_()
354 { this->sections_
.reserve(obj
->shnum()); }
359 { return this->obj_
; }
361 // Record that this object is an archive member.
364 { this->is_member_
= true; }
366 // Return true if this object is an archive member.
369 { return this->is_member_
; }
371 // Add an input section.
373 add_input_section(unsigned int shndx
, Stringpool::Key name_key
, off_t sh_size
)
374 { this->sections_
.push_back(Input_section(shndx
, name_key
, sh_size
)); }
376 // Return the number of input sections in this object.
378 get_input_section_count() const
379 { return this->sections_
.size(); }
381 // Return the input section index for the Nth input section.
383 get_input_section_index(unsigned int n
) const
384 { return this->sections_
[n
].shndx_
; }
386 // Return the stringpool key of the Nth input section.
388 get_input_section_name_key(unsigned int n
) const
389 { return this->sections_
[n
].name_key_
; }
391 // Return the size of the Nth input section.
393 get_input_section_size(unsigned int n
) const
394 { return this->sections_
[n
].sh_size_
; }
396 // Add a kept COMDAT group.
398 add_comdat_group(Stringpool::Key signature_key
)
399 { this->groups_
.push_back(signature_key
); }
401 // Return the number of COMDAT groups.
403 get_comdat_group_count() const
404 { return this->groups_
.size(); }
406 // Return the stringpool key for the signature of the Nth comdat group.
408 get_comdat_signature_key(unsigned int n
) const
409 { return this->groups_
[n
]; }
412 virtual Incremental_input_type
415 return (this->is_member_
416 ? INCREMENTAL_INPUT_ARCHIVE_MEMBER
417 : INCREMENTAL_INPUT_OBJECT
);
420 // Return a pointer to the derived Incremental_object_entry object.
421 virtual Incremental_object_entry
*
426 // The object file itself.
429 // Whether this object is an archive member.
435 Input_section(unsigned int shndx
, Stringpool::Key name_key
, off_t sh_size
)
436 : shndx_(shndx
), name_key_(name_key
), sh_size_(sh_size
)
439 Stringpool::Key name_key_
;
442 std::vector
<Input_section
> sections_
;
445 std::vector
<Stringpool::Key
> groups_
;
448 // Class for recording shared library input files.
450 class Incremental_dynobj_entry
: public Incremental_input_entry
453 Incremental_dynobj_entry(Stringpool::Key filename_key
,
454 Stringpool::Key soname_key
, Object
* obj
,
455 unsigned int arg_serial
, Timespec mtime
)
456 : Incremental_input_entry(filename_key
, arg_serial
, mtime
),
457 soname_key_(soname_key
), obj_(obj
)
463 { return this->obj_
; }
465 // Get the stringpool key for the soname.
467 get_soname_key() const
468 { return this->soname_key_
; }
471 virtual Incremental_input_type
473 { return INCREMENTAL_INPUT_SHARED_LIBRARY
; }
475 // Return a pointer to the derived Incremental_dynobj_entry object.
476 virtual Incremental_dynobj_entry
*
481 // Key of the soname string in the section stringtable.
482 Stringpool::Key soname_key_
;
484 // The object file itself.
488 // Class for recording archive library input files.
490 class Incremental_archive_entry
: public Incremental_input_entry
493 Incremental_archive_entry(Stringpool::Key filename_key
,
494 unsigned int arg_serial
, Timespec mtime
)
495 : Incremental_input_entry(filename_key
, arg_serial
, mtime
), members_(),
499 // Add a member object to the archive.
501 add_object(Incremental_object_entry
* obj_entry
)
503 this->members_
.push_back(obj_entry
);
504 obj_entry
->set_is_member();
507 // Add an unused global symbol to the archive.
509 add_unused_global_symbol(Stringpool::Key symbol_key
)
510 { this->unused_syms_
.push_back(symbol_key
); }
512 // Return the number of member objects included in the link.
515 { return this->members_
.size(); }
517 // Return the Nth member object.
518 Incremental_object_entry
*
519 get_member(unsigned int n
)
520 { return this->members_
[n
]; }
522 // Return the number of unused global symbols in this archive.
524 get_unused_global_symbol_count()
525 { return this->unused_syms_
.size(); }
527 // Return the Nth unused global symbol.
529 get_unused_global_symbol(unsigned int n
)
530 { return this->unused_syms_
[n
]; }
533 virtual Incremental_input_type
535 { return INCREMENTAL_INPUT_ARCHIVE
; }
537 // Return a pointer to the derived Incremental_archive_entry object.
538 virtual Incremental_archive_entry
*
543 // Members of the archive that have been included in the link.
544 std::vector
<Incremental_object_entry
*> members_
;
546 // Unused global symbols from this archive.
547 std::vector
<Stringpool::Key
> unused_syms_
;
550 // This class contains the information needed during an incremental
551 // build about the inputs necessary to build the .gnu_incremental_inputs.
553 class Incremental_inputs
556 typedef std::vector
<Incremental_input_entry
*> Input_list
;
559 : inputs_(), command_line_(), command_line_key_(0),
560 strtab_(new Stringpool()), current_object_(NULL
),
561 current_object_entry_(NULL
), inputs_section_(NULL
),
562 symtab_section_(NULL
), relocs_section_(NULL
),
566 ~Incremental_inputs() { delete this->strtab_
; }
568 // Record the command line.
570 report_command_line(int argc
, const char* const* argv
);
572 // Record the initial info for archive file ARCHIVE.
574 report_archive_begin(Library_base
* arch
, unsigned int arg_serial
,
575 Script_info
* script_info
);
577 // Record the final info for archive file ARCHIVE.
579 report_archive_end(Library_base
* arch
);
581 // Record the info for object file OBJ. If ARCH is not NULL,
582 // attach the object file to the archive.
584 report_object(Object
* obj
, unsigned int arg_serial
, Library_base
* arch
,
585 Script_info
* script_info
);
587 // Record an input section belonging to object file OBJ.
589 report_input_section(Object
* obj
, unsigned int shndx
, const char* name
,
592 // Record a kept COMDAT group belonging to object file OBJ.
594 report_comdat_group(Object
* obj
, const char* name
);
596 // Record the info for input script SCRIPT.
598 report_script(Script_info
* script
, unsigned int arg_serial
,
601 // Return the running count of incremental relocations.
603 get_reloc_count() const
604 { return this->reloc_count_
; }
606 // Update the running count of incremental relocations.
608 set_reloc_count(unsigned int count
)
609 { this->reloc_count_
= count
; }
611 // Prepare for layout. Called from Layout::finalize.
615 // Create the .gnu_incremental_inputs and related sections.
617 create_data_sections(Symbol_table
* symtab
);
619 // Return the .gnu_incremental_inputs section.
621 inputs_section() const
622 { return this->inputs_section_
; }
624 // Return the .gnu_incremental_symtab section.
626 symtab_section() const
627 { return this->symtab_section_
; }
629 // Return the .gnu_incremental_relocs section.
631 relocs_section() const
632 { return this->relocs_section_
; }
634 // Return the .gnu_incremental_got_plt section.
636 got_plt_section() const
637 { return this->got_plt_section_
; }
639 // Return the .gnu_incremental_strtab stringpool.
641 get_stringpool() const
642 { return this->strtab_
; }
644 // Return the canonical form of the command line, as will be stored in
645 // .gnu_incremental_strtab.
648 { return this->command_line_
; }
650 // Return the stringpool key of the command line.
652 command_line_key() const
653 { return this->command_line_key_
; }
655 // Return the number of input files.
657 input_file_count() const
658 { return this->inputs_
.size(); }
660 // Return the input files.
663 { return this->inputs_
; }
665 // Return the sh_entsize value for the .gnu_incremental_relocs section.
667 relocs_entsize() const;
670 // The list of input files.
673 // Canonical form of the command line, as will be stored in
674 // .gnu_incremental_strtab.
675 std::string command_line_
;
677 // The key of the command line string in the string pool.
678 Stringpool::Key command_line_key_
;
680 // The .gnu_incremental_strtab string pool associated with the
681 // .gnu_incremental_inputs.
684 // Keep track of the object currently being processed.
685 Object
* current_object_
;
686 Incremental_object_entry
* current_object_entry_
;
688 // The .gnu_incremental_inputs section.
689 Output_section_data
* inputs_section_
;
691 // The .gnu_incremental_symtab section.
692 Output_data_space
* symtab_section_
;
694 // The .gnu_incremental_relocs section.
695 Output_data_space
* relocs_section_
;
697 // The .gnu_incremental_got_plt section.
698 Output_data_space
* got_plt_section_
;
700 // Total count of incremental relocations. Updated during Scan_relocs
701 // phase at the completion of each object file.
702 unsigned int reloc_count_
;
705 // Reader class for global symbol info from an object file entry in
706 // the .gnu_incremental_inputs section.
708 template<bool big_endian
>
709 class Incremental_global_symbol_reader
712 typedef elfcpp::Swap
<32, big_endian
> Swap32
;
715 Incremental_global_symbol_reader(const unsigned char* p
)
720 output_symndx() const
721 { return Swap32::readval(this->p_
); }
725 { return Swap32::readval(this->p_
+ 4); }
729 { return Swap32::readval(this->p_
+ 8); }
733 { return Swap32::readval(this->p_
+ 12); }
737 { return Swap32::readval(this->p_
+ 16); }
740 // Base address of the symbol entry.
741 const unsigned char* p_
;
744 // Reader class for .gnu_incremental_inputs section.
746 template<int size
, bool big_endian
>
747 class Incremental_inputs_reader
750 typedef elfcpp::Swap
<size
, big_endian
> Swap
;
751 typedef elfcpp::Swap
<16, big_endian
> Swap16
;
752 typedef elfcpp::Swap
<32, big_endian
> Swap32
;
753 typedef elfcpp::Swap
<64, big_endian
> Swap64
;
756 Incremental_inputs_reader()
757 : p_(NULL
), strtab_(NULL
, 0), input_file_count_(0)
760 Incremental_inputs_reader(const unsigned char* p
,
761 const elfcpp::Elf_strtab
& strtab
)
762 : p_(p
), strtab_(strtab
)
763 { this->input_file_count_
= Swap32::readval(this->p_
+ 4); }
765 // Return the version number.
768 { return Swap32::readval(this->p_
); }
770 // Return the count of input file entries.
772 input_file_count() const
773 { return this->input_file_count_
; }
775 // Return the command line.
779 unsigned int offset
= Swap32::readval(this->p_
+ 8);
780 return this->get_string(offset
);
783 // Reader class for an input file entry and its supplemental info.
784 class Incremental_input_entry_reader
787 Incremental_input_entry_reader(const Incremental_inputs_reader
* inputs
,
789 : inputs_(inputs
), offset_(offset
)
791 this->info_offset_
= Swap32::readval(inputs
->p_
+ offset
+ 4);
792 this->flags_
= Swap16::readval(this->inputs_
->p_
+ offset
+ 20);
795 // Return the filename.
799 unsigned int offset
= Swap32::readval(this->inputs_
->p_
+ this->offset_
);
800 return this->inputs_
->get_string(offset
);
803 // Return the argument serial number.
807 return Swap16::readval(this->inputs_
->p_
+ this->offset_
+ 22);
810 // Return the timestamp.
815 const unsigned char* p
= this->inputs_
->p_
+ this->offset_
+ 8;
816 t
.seconds
= Swap64::readval(p
);
817 t
.nanoseconds
= Swap32::readval(p
+8);
821 // Return the type of input file.
822 Incremental_input_type
824 { return static_cast<Incremental_input_type
>(this->flags_
& 0xff); }
826 // Return TRUE if the file was found in a system directory.
828 is_in_system_directory() const
829 { return (this->flags_
& INCREMENTAL_INPUT_IN_SYSTEM_DIR
) != 0; }
831 // Return TRUE if the file was linked with --as-needed.
834 { return (this->flags_
& INCREMENTAL_INPUT_AS_NEEDED
) != 0; }
836 // Return the input section count -- for objects only.
838 get_input_section_count() const
840 gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT
841 || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER
);
842 return Swap32::readval(this->inputs_
->p_
+ this->info_offset_
);
845 // Return the soname -- for shared libraries only.
849 gold_assert(this->type() == INCREMENTAL_INPUT_SHARED_LIBRARY
);
850 unsigned int offset
= Swap32::readval(this->inputs_
->p_
851 + this->info_offset_
);
852 return this->inputs_
->get_string(offset
);
855 // Return the offset of the supplemental info for symbol SYMNDX --
858 get_symbol_offset(unsigned int symndx
) const
860 gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT
861 || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER
);
863 unsigned int section_count
= this->get_input_section_count();
864 return (this->info_offset_
+ 28
865 + section_count
* input_section_entry_size
869 // Return the global symbol count -- for objects & shared libraries only.
871 get_global_symbol_count() const
873 gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT
874 || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER
875 || this->type() == INCREMENTAL_INPUT_SHARED_LIBRARY
);
876 return Swap32::readval(this->inputs_
->p_
+ this->info_offset_
+ 4);
879 // Return the offset of the first local symbol -- for objects only.
881 get_local_symbol_offset() const
883 gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT
884 || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER
);
886 return Swap32::readval(this->inputs_
->p_
+ this->info_offset_
+ 8);
889 // Return the local symbol count -- for objects only.
891 get_local_symbol_count() const
893 gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT
894 || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER
);
896 return Swap32::readval(this->inputs_
->p_
+ this->info_offset_
+ 12);
899 // Return the index of the first dynamic relocation -- for objects only.
901 get_first_dyn_reloc() const
903 gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT
904 || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER
);
906 return Swap32::readval(this->inputs_
->p_
+ this->info_offset_
+ 16);
909 // Return the dynamic relocation count -- for objects only.
911 get_dyn_reloc_count() const
913 gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT
914 || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER
);
916 return Swap32::readval(this->inputs_
->p_
+ this->info_offset_
+ 20);
919 // Return the COMDAT group count -- for objects only.
921 get_comdat_group_count() const
923 gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT
924 || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER
);
926 return Swap32::readval(this->inputs_
->p_
+ this->info_offset_
+ 24);
929 // Return the object count -- for scripts only.
931 get_object_count() const
933 gold_assert(this->type() == INCREMENTAL_INPUT_SCRIPT
);
934 return Swap32::readval(this->inputs_
->p_
+ this->info_offset_
);
937 // Return the input file offset for object N -- for scripts only.
939 get_object_offset(unsigned int n
) const
941 gold_assert(this->type() == INCREMENTAL_INPUT_SCRIPT
);
942 return Swap32::readval(this->inputs_
->p_
+ this->info_offset_
946 // Return the member count -- for archives only.
948 get_member_count() const
950 gold_assert(this->type() == INCREMENTAL_INPUT_ARCHIVE
);
951 return Swap32::readval(this->inputs_
->p_
+ this->info_offset_
);
954 // Return the unused symbol count -- for archives only.
956 get_unused_symbol_count() const
958 gold_assert(this->type() == INCREMENTAL_INPUT_ARCHIVE
);
959 return Swap32::readval(this->inputs_
->p_
+ this->info_offset_
+ 4);
962 // Return the input file offset for archive member N -- for archives only.
964 get_member_offset(unsigned int n
) const
966 gold_assert(this->type() == INCREMENTAL_INPUT_ARCHIVE
);
967 return Swap32::readval(this->inputs_
->p_
+ this->info_offset_
971 // Return the Nth unused global symbol -- for archives only.
973 get_unused_symbol(unsigned int n
) const
975 gold_assert(this->type() == INCREMENTAL_INPUT_ARCHIVE
);
976 unsigned int member_count
= this->get_member_count();
977 unsigned int offset
= Swap32::readval(this->inputs_
->p_
978 + this->info_offset_
+ 8
981 return this->inputs_
->get_string(offset
);
984 // Information about an input section.
985 struct Input_section_info
988 unsigned int output_shndx
;
993 // Return info about the Nth input section -- for objects only.
995 get_input_section(unsigned int n
) const
997 Input_section_info info
;
998 const unsigned char* p
= (this->inputs_
->p_
999 + this->info_offset_
+ 28
1000 + n
* input_section_entry_size
);
1001 unsigned int name_offset
= Swap32::readval(p
);
1002 info
.name
= this->inputs_
->get_string(name_offset
);
1003 info
.output_shndx
= Swap32::readval(p
+ 4);
1004 info
.sh_offset
= Swap::readval(p
+ 8);
1005 info
.sh_size
= Swap::readval(p
+ 8 + size
/ 8);
1009 // Return info about the Nth global symbol -- for objects only.
1010 Incremental_global_symbol_reader
<big_endian
>
1011 get_global_symbol_reader(unsigned int n
) const
1013 gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT
1014 || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER
);
1015 unsigned int section_count
= this->get_input_section_count();
1016 const unsigned char* p
= (this->inputs_
->p_
1017 + this->info_offset_
+ 28
1018 + section_count
* input_section_entry_size
1020 return Incremental_global_symbol_reader
<big_endian
>(p
);
1023 // Return the signature of the Nth comdat group -- for objects only.
1025 get_comdat_group_signature(unsigned int n
) const
1027 unsigned int section_count
= this->get_input_section_count();
1028 unsigned int symbol_count
= this->get_global_symbol_count();
1029 const unsigned char* p
= (this->inputs_
->p_
1030 + this->info_offset_
+ 28
1031 + section_count
* input_section_entry_size
1034 unsigned int name_offset
= Swap32::readval(p
);
1035 return this->inputs_
->get_string(name_offset
);
1038 // Return the output symbol index for the Nth global symbol -- for shared
1039 // libraries only. Sets *IS_DEF to TRUE if the symbol is defined in this
1040 // input file. Sets *IS_COPY to TRUE if the symbol was copied from this
1041 // input file with a COPY relocation.
1043 get_output_symbol_index(unsigned int n
, bool* is_def
, bool* is_copy
)
1045 gold_assert(this->type() == INCREMENTAL_INPUT_SHARED_LIBRARY
);
1046 const unsigned char* p
= (this->inputs_
->p_
1047 + this->info_offset_
+ 8
1049 unsigned int output_symndx
= Swap32::readval(p
);
1050 unsigned int flags
= output_symndx
>> INCREMENTAL_SHLIB_SYM_FLAGS_SHIFT
;
1051 output_symndx
&= ((1U << INCREMENTAL_SHLIB_SYM_FLAGS_SHIFT
) - 1);
1054 case INCREMENTAL_SHLIB_SYM_DEF
:
1058 case INCREMENTAL_SHLIB_SYM_COPY
:
1066 return output_symndx
;
1070 // Size of an input section entry.
1071 static const unsigned int input_section_entry_size
= 8 + 2 * size
/ 8;
1072 // The reader instance for the containing section.
1073 const Incremental_inputs_reader
* inputs_
;
1074 // The flags, including the type of input file.
1075 unsigned int flags_
;
1076 // Section offset to the input file entry.
1077 unsigned int offset_
;
1078 // Section offset to the supplemental info for the input file.
1079 unsigned int info_offset_
;
1082 // Return the offset of an input file entry given its index N.
1084 input_file_offset(unsigned int n
) const
1086 gold_assert(n
< this->input_file_count_
);
1090 // Return the index of an input file entry given its OFFSET.
1092 input_file_index(unsigned int offset
) const
1094 int n
= (offset
- 16) / 24;
1095 gold_assert(input_file_offset(n
) == offset
);
1099 // Return a reader for the Nth input file entry.
1100 Incremental_input_entry_reader
1101 input_file(unsigned int n
) const
1102 { return Incremental_input_entry_reader(this, this->input_file_offset(n
)); }
1104 // Return a reader for the input file entry at OFFSET.
1105 Incremental_input_entry_reader
1106 input_file_at_offset(unsigned int offset
) const
1108 gold_assert(offset
< 16 + this->input_file_count_
* 24);
1109 return Incremental_input_entry_reader(this, offset
);
1112 // Return a reader for the global symbol info at OFFSET.
1113 Incremental_global_symbol_reader
<big_endian
>
1114 global_symbol_reader_at_offset(unsigned int offset
) const
1116 const unsigned char* p
= this->p_
+ offset
;
1117 return Incremental_global_symbol_reader
<big_endian
>(p
);
1121 // Lookup a string in the ELF string table.
1122 const char* get_string(unsigned int offset
) const
1125 if (this->strtab_
.get_c_string(offset
, &s
))
1130 // Base address of the .gnu_incremental_inputs section.
1131 const unsigned char* p_
;
1132 // The associated ELF string table.
1133 elfcpp::Elf_strtab strtab_
;
1134 // The number of input file entries in this section.
1135 unsigned int input_file_count_
;
1138 // Reader class for the .gnu_incremental_symtab section.
1140 template<bool big_endian
>
1141 class Incremental_symtab_reader
1144 Incremental_symtab_reader()
1148 Incremental_symtab_reader(const unsigned char* p
, off_t len
)
1152 // Return the count of symbols in this section.
1154 symbol_count() const
1155 { return static_cast<unsigned int>(this->len_
/ 4); }
1157 // Return the list head for symbol table entry N.
1159 get_list_head(unsigned int n
) const
1160 { return elfcpp::Swap
<32, big_endian
>::readval(this->p_
+ 4 * n
); }
1163 // Base address of the .gnu_incremental_relocs section.
1164 const unsigned char* p_
;
1165 // Size of the section.
1169 // Reader class for the .gnu_incremental_relocs section.
1171 template<int size
, bool big_endian
>
1172 class Incremental_relocs_reader
1175 // Size of each field.
1176 static const unsigned int field_size
= size
/ 8;
1179 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
1180 typedef typename
elfcpp::Elf_types
<size
>::Elf_Swxword Addend
;
1182 // Size of each entry.
1183 static const unsigned int reloc_size
= 8 + 2 * field_size
;
1185 Incremental_relocs_reader()
1189 Incremental_relocs_reader(const unsigned char* p
, off_t len
)
1193 // Return the count of relocations in this section.
1196 { return static_cast<unsigned int>(this->len_
/ reloc_size
); }
1198 // Return the relocation type for relocation entry at offset OFF.
1200 get_r_type(unsigned int off
) const
1201 { return elfcpp::Swap
<32, big_endian
>::readval(this->p_
+ off
); }
1203 // Return the output section index for relocation entry at offset OFF.
1205 get_r_shndx(unsigned int off
) const
1206 { return elfcpp::Swap
<32, big_endian
>::readval(this->p_
+ off
+ 4); }
1208 // Return the output section offset for relocation entry at offset OFF.
1210 get_r_offset(unsigned int off
) const
1211 { return elfcpp::Swap
<size
, big_endian
>::readval(this->p_
+ off
+ 8); }
1213 // Return the addend for relocation entry at offset OFF.
1215 get_r_addend(unsigned int off
) const
1217 return elfcpp::Swap
<size
, big_endian
>::readval(this->p_
+ off
+ 8
1218 + this->field_size
);
1221 // Return a pointer to the relocation entry at offset OFF.
1222 const unsigned char*
1223 data(unsigned int off
) const
1224 { return this->p_
+ off
; }
1227 // Base address of the .gnu_incremental_relocs section.
1228 const unsigned char* p_
;
1229 // Size of the section.
1233 // Reader class for the .gnu_incremental_got_plt section.
1235 template<bool big_endian
>
1236 class Incremental_got_plt_reader
1239 Incremental_got_plt_reader()
1240 : p_(NULL
), got_count_(0), got_desc_p_(NULL
), plt_desc_p_(NULL
)
1243 Incremental_got_plt_reader(const unsigned char* p
) : p_(p
)
1245 this->got_count_
= elfcpp::Swap
<32, big_endian
>::readval(p
);
1246 this->got_desc_p_
= p
+ 8 + ((this->got_count_
+ 3) & ~3);
1247 this->plt_desc_p_
= this->got_desc_p_
+ this->got_count_
* 8;
1250 // Return the GOT entry count.
1252 get_got_entry_count() const
1254 return this->got_count_
;
1257 // Return the PLT entry count.
1259 get_plt_entry_count() const
1261 return elfcpp::Swap
<32, big_endian
>::readval(this->p_
+ 4);
1264 // Return the GOT type for GOT entry N.
1266 get_got_type(unsigned int n
)
1268 return this->p_
[8 + n
];
1271 // Return the symbol index for GOT entry N.
1273 get_got_symndx(unsigned int n
)
1275 return elfcpp::Swap
<32, big_endian
>::readval(this->got_desc_p_
+ n
* 8);
1278 // Return the input file index for GOT entry N.
1280 get_got_input_index(unsigned int n
)
1282 return elfcpp::Swap
<32, big_endian
>::readval(this->got_desc_p_
+ n
* 8 + 4);
1285 // Return the PLT descriptor for PLT entry N.
1287 get_plt_desc(unsigned int n
)
1289 return elfcpp::Swap
<32, big_endian
>::readval(this->plt_desc_p_
+ n
* 4);
1293 // Base address of the .gnu_incremental_got_plt section.
1294 const unsigned char* p_
;
1296 unsigned int got_count_
;
1297 // Base address of the GOT descriptor array.
1298 const unsigned char* got_desc_p_
;
1299 // Base address of the PLT descriptor array.
1300 const unsigned char* plt_desc_p_
;
1303 // An object representing the ELF file we edit during an incremental build.
1304 // Similar to Object or Dynobj, but operates on Output_file and contains
1305 // methods to support incremental updating. This is the abstract parent class
1306 // implemented in Sized_incremental_binary<size, big_endian> for a specific
1307 // endianness and size.
1309 class Incremental_binary
1312 Incremental_binary(Output_file
* output
, Target
* target
)
1313 : input_args_map_(), library_map_(), script_map_(),
1314 output_(output
), target_(target
)
1318 ~Incremental_binary()
1321 // Check the .gnu_incremental_inputs section to see whether an incremental
1322 // build is possible.
1324 check_inputs(const Command_line
& cmdline
,
1325 Incremental_inputs
* incremental_inputs
)
1326 { return this->do_check_inputs(cmdline
, incremental_inputs
); }
1330 error(const char* format
, ...) const ATTRIBUTE_PRINTF_2
;
1332 // Proxy class for a sized Incremental_input_entry_reader.
1346 { return this->do_filename(); }
1350 { return this->do_get_mtime(); }
1352 Incremental_input_type
1354 { return this->do_type(); }
1358 { return this->do_arg_serial(); }
1361 get_unused_symbol_count() const
1362 { return this->do_get_unused_symbol_count(); }
1365 get_unused_symbol(unsigned int n
) const
1366 { return this->do_get_unused_symbol(n
); }
1370 do_filename() const = 0;
1373 do_get_mtime() const = 0;
1375 virtual Incremental_input_type
1376 do_type() const = 0;
1378 virtual unsigned int
1379 do_arg_serial() const = 0;
1381 virtual unsigned int
1382 do_get_unused_symbol_count() const = 0;
1385 do_get_unused_symbol(unsigned int n
) const = 0;
1388 // Return the number of input files.
1390 input_file_count() const
1391 { return this->do_input_file_count(); }
1393 // Return an Input_reader for input file N.
1395 get_input_reader(unsigned int n
) const
1396 { return this->do_get_input_reader(n
); }
1398 // Return TRUE if the input file N has changed since the last link.
1400 file_has_changed(unsigned int n
) const
1401 { return this->do_file_has_changed(n
); }
1403 // Return the Input_argument for input file N. Returns NULL if
1404 // the Input_argument is not available.
1405 const Input_argument
*
1406 get_input_argument(unsigned int n
) const
1408 const Input_reader
* input_file
= this->do_get_input_reader(n
);
1409 unsigned int arg_serial
= input_file
->arg_serial();
1410 if (arg_serial
== 0 || arg_serial
> this->input_args_map_
.size())
1412 return this->input_args_map_
[arg_serial
- 1];
1415 // Return an Incremental_library for the given input file.
1416 Incremental_library
*
1417 get_library(unsigned int n
) const
1418 { return this->library_map_
[n
]; }
1420 // Return a Script_info for the given input file.
1422 get_script_info(unsigned int n
) const
1423 { return this->script_map_
[n
]; }
1425 // Initialize the layout of the output file based on the existing
1428 init_layout(Layout
* layout
)
1429 { this->do_init_layout(layout
); }
1431 // Mark regions of the input file that must be kept unchanged.
1433 reserve_layout(unsigned int input_file_index
)
1434 { this->do_reserve_layout(input_file_index
); }
1436 // Process the GOT and PLT entries from the existing output file.
1438 process_got_plt(Symbol_table
* symtab
, Layout
* layout
)
1439 { this->do_process_got_plt(symtab
, layout
); }
1441 // Emit COPY relocations from the existing output file.
1443 emit_copy_relocs(Symbol_table
* symtab
)
1444 { this->do_emit_copy_relocs(symtab
); }
1446 // Apply incremental relocations for symbols whose values have changed.
1448 apply_incremental_relocs(const Symbol_table
* symtab
, Layout
* layout
,
1450 { this->do_apply_incremental_relocs(symtab
, layout
, of
); }
1452 // Functions and types for the elfcpp::Elf_file interface. This
1453 // permit us to use Incremental_binary as the File template parameter for
1454 // elfcpp::Elf_file.
1456 // The View class is returned by view. It must support a single
1457 // method, data(). This is trivial, because Output_file::get_output_view
1458 // does what we need.
1462 View(const unsigned char* p
)
1466 const unsigned char*
1468 { return this->p_
; }
1471 const unsigned char* p_
;
1476 view(off_t file_offset
, section_size_type data_size
)
1477 { return View(this->output_
->get_input_view(file_offset
, data_size
)); }
1479 // A location in the file.
1485 Location(off_t fo
, section_size_type ds
)
1486 : file_offset(fo
), data_size(ds
)
1490 : file_offset(0), data_size(0)
1494 // Get a View given a Location.
1497 { return View(this->view(loc
.file_offset
, loc
.data_size
)); }
1499 // Return the Output_file.
1502 { return this->output_
; }
1505 // Check the .gnu_incremental_inputs section to see whether an incremental
1506 // build is possible.
1508 do_check_inputs(const Command_line
& cmdline
,
1509 Incremental_inputs
* incremental_inputs
) = 0;
1511 // Return TRUE if input file N has changed since the last incremental link.
1513 do_file_has_changed(unsigned int n
) const = 0;
1515 // Initialize the layout of the output file based on the existing
1518 do_init_layout(Layout
* layout
) = 0;
1520 // Mark regions of the input file that must be kept unchanged.
1522 do_reserve_layout(unsigned int input_file_index
) = 0;
1524 // Process the GOT and PLT entries from the existing output file.
1526 do_process_got_plt(Symbol_table
* symtab
, Layout
* layout
) = 0;
1528 // Emit COPY relocations from the existing output file.
1530 do_emit_copy_relocs(Symbol_table
* symtab
) = 0;
1532 // Apply incremental relocations for symbols whose values have changed.
1534 do_apply_incremental_relocs(const Symbol_table
*, Layout
*, Output_file
*) = 0;
1536 virtual unsigned int
1537 do_input_file_count() const = 0;
1539 virtual const Input_reader
*
1540 do_get_input_reader(unsigned int) const = 0;
1542 // Map from input file index to Input_argument.
1543 std::vector
<const Input_argument
*> input_args_map_
;
1544 // Map from an input file index to an Incremental_library.
1545 std::vector
<Incremental_library
*> library_map_
;
1546 // Map from an input file index to a Script_info.
1547 std::vector
<Script_info
*> script_map_
;
1550 // Edited output file object.
1551 Output_file
* output_
;
1552 // Target of the output file.
1556 template<int size
, bool big_endian
>
1557 class Sized_relobj_incr
;
1559 template<int size
, bool big_endian
>
1560 class Sized_incremental_binary
: public Incremental_binary
1563 Sized_incremental_binary(Output_file
* output
,
1564 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
,
1566 : Incremental_binary(output
, target
), elf_file_(this, ehdr
),
1567 input_objects_(), section_map_(), symbol_map_(), copy_relocs_(),
1568 main_symtab_loc_(), main_strtab_loc_(), has_incremental_info_(false),
1569 inputs_reader_(), symtab_reader_(), relocs_reader_(), got_plt_reader_(),
1570 input_entry_readers_()
1571 { this->setup_readers(); }
1573 // Returns TRUE if the file contains incremental info.
1575 has_incremental_info() const
1576 { return this->has_incremental_info_
; }
1578 // Record a pointer to the object for input file N.
1580 set_input_object(unsigned int n
,
1581 Sized_relobj_incr
<size
, big_endian
>* obj
)
1582 { this->input_objects_
[n
] = obj
; }
1584 // Return a pointer to the object for input file N.
1585 Sized_relobj_incr
<size
, big_endian
>*
1586 input_object(unsigned int n
) const
1588 gold_assert(n
< this->input_objects_
.size());
1589 return this->input_objects_
[n
];
1592 // Return the Output_section for section index SHNDX.
1594 output_section(unsigned int shndx
)
1595 { return this->section_map_
[shndx
]; }
1597 // Map a symbol table entry from the base file to the output symbol table.
1598 // SYMNDX is relative to the first forced-local or global symbol in the
1599 // input file symbol table.
1601 add_global_symbol(unsigned int symndx
, Symbol
* gsym
)
1602 { this->symbol_map_
[symndx
] = gsym
; }
1604 // Map a symbol table entry from the base file to the output symbol table.
1605 // SYMNDX is relative to the first forced-local or global symbol in the
1606 // input file symbol table.
1608 global_symbol(unsigned int symndx
) const
1609 { return this->symbol_map_
[symndx
]; }
1611 // Add a COPY relocation for a global symbol.
1613 add_copy_reloc(Symbol
* gsym
, Output_section
* os
, off_t offset
)
1614 { this->copy_relocs_
.push_back(Copy_reloc(gsym
, os
, offset
)); }
1616 // Readers for the incremental info sections.
1618 const Incremental_inputs_reader
<size
, big_endian
>&
1619 inputs_reader() const
1620 { return this->inputs_reader_
; }
1622 const Incremental_symtab_reader
<big_endian
>&
1623 symtab_reader() const
1624 { return this->symtab_reader_
; }
1626 const Incremental_relocs_reader
<size
, big_endian
>&
1627 relocs_reader() const
1628 { return this->relocs_reader_
; }
1630 const Incremental_got_plt_reader
<big_endian
>&
1631 got_plt_reader() const
1632 { return this->got_plt_reader_
; }
1635 get_symtab_view(View
* symtab_view
, unsigned int* sym_count
,
1636 elfcpp::Elf_strtab
* strtab
);
1639 typedef Incremental_inputs_reader
<size
, big_endian
> Inputs_reader
;
1640 typedef typename
Inputs_reader::Incremental_input_entry_reader
1644 do_check_inputs(const Command_line
& cmdline
,
1645 Incremental_inputs
* incremental_inputs
);
1647 // Return TRUE if input file N has changed since the last incremental link.
1649 do_file_has_changed(unsigned int n
) const;
1651 // Initialize the layout of the output file based on the existing
1654 do_init_layout(Layout
* layout
);
1656 // Mark regions of the input file that must be kept unchanged.
1658 do_reserve_layout(unsigned int input_file_index
);
1660 // Process the GOT and PLT entries from the existing output file.
1662 do_process_got_plt(Symbol_table
* symtab
, Layout
* layout
);
1664 // Emit COPY relocations from the existing output file.
1666 do_emit_copy_relocs(Symbol_table
* symtab
);
1668 // Apply incremental relocations for symbols whose values have changed.
1670 do_apply_incremental_relocs(const Symbol_table
* symtab
, Layout
* layout
,
1673 // Proxy class for a sized Incremental_input_entry_reader.
1675 class Sized_input_reader
: public Input_reader
1678 Sized_input_reader(Input_entry_reader r
)
1679 : Input_reader(), reader_(r
)
1683 ~Sized_input_reader()
1689 { return this->reader_
.filename(); }
1692 do_get_mtime() const
1693 { return this->reader_
.get_mtime(); }
1695 Incremental_input_type
1697 { return this->reader_
.type(); }
1700 do_arg_serial() const
1701 { return this->reader_
.arg_serial(); }
1704 do_get_unused_symbol_count() const
1705 { return this->reader_
.get_unused_symbol_count(); }
1708 do_get_unused_symbol(unsigned int n
) const
1709 { return this->reader_
.get_unused_symbol(n
); }
1711 Input_entry_reader reader_
;
1714 virtual unsigned int
1715 do_input_file_count() const
1716 { return this->inputs_reader_
.input_file_count(); }
1718 virtual const Input_reader
*
1719 do_get_input_reader(unsigned int n
) const
1721 gold_assert(n
< this->input_entry_readers_
.size());
1722 return &this->input_entry_readers_
[n
];
1726 // List of symbols that need COPY relocations.
1729 Copy_reloc(Symbol
* sym
, Output_section
* os
, off_t off
)
1730 : symbol(sym
), output_section(os
), offset(off
)
1733 // The global symbol to copy.
1735 // The output section into which the symbol was copied.
1736 Output_section
* output_section
;
1737 // The offset within that output section.
1740 typedef std::vector
<Copy_reloc
> Copy_relocs
;
1743 find_incremental_inputs_sections(unsigned int* p_inputs_shndx
,
1744 unsigned int* p_symtab_shndx
,
1745 unsigned int* p_relocs_shndx
,
1746 unsigned int* p_got_plt_shndx
,
1747 unsigned int* p_strtab_shndx
);
1752 // Output as an ELF file.
1753 elfcpp::Elf_file
<size
, big_endian
, Incremental_binary
> elf_file_
;
1755 // Vector of pointers to the input objects for the unchanged files.
1756 // For replaced files, the corresponding pointer is NULL.
1757 std::vector
<Sized_relobj_incr
<size
, big_endian
>*> input_objects_
;
1759 // Map section index to an Output_section in the updated layout.
1760 std::vector
<Output_section
*> section_map_
;
1762 // Map global symbols from the input file to the symbol table.
1763 std::vector
<Symbol
*> symbol_map_
;
1765 // List of symbols that need COPY relocations.
1766 Copy_relocs copy_relocs_
;
1768 // Locations of the main symbol table and symbol string table.
1769 Location main_symtab_loc_
;
1770 Location main_strtab_loc_
;
1772 // Readers for the incremental info sections.
1773 bool has_incremental_info_
;
1774 Incremental_inputs_reader
<size
, big_endian
> inputs_reader_
;
1775 Incremental_symtab_reader
<big_endian
> symtab_reader_
;
1776 Incremental_relocs_reader
<size
, big_endian
> relocs_reader_
;
1777 Incremental_got_plt_reader
<big_endian
> got_plt_reader_
;
1778 std::vector
<Sized_input_reader
> input_entry_readers_
;
1781 // An incremental Relobj. This class represents a relocatable object
1782 // that has not changed since the last incremental link, and whose contents
1783 // can be used directly from the base file.
1785 template<int size
, bool big_endian
>
1786 class Sized_relobj_incr
: public Sized_relobj
<size
, big_endian
>
1789 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
1790 typedef typename Sized_relobj
<size
, big_endian
>::Symbols Symbols
;
1792 Sized_relobj_incr(const std::string
& name
,
1793 Sized_incremental_binary
<size
, big_endian
>* ibase
,
1794 unsigned int input_file_index
);
1798 typedef Sized_relobj_incr
<size
, big_endian
> This
;
1799 static const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1801 typedef typename Sized_relobj
<size
, big_endian
>::Output_sections
1803 typedef Incremental_inputs_reader
<size
, big_endian
> Inputs_reader
;
1804 typedef typename
Inputs_reader::Incremental_input_entry_reader
1810 Local_symbol(const char* name_
, Address value_
, unsigned int size_
,
1811 unsigned int shndx_
, unsigned int type_
,
1812 bool needs_dynsym_entry_
)
1813 : st_value(value_
), name(name_
), st_size(size_
), st_shndx(shndx_
),
1814 st_type(type_
), output_dynsym_index(0),
1815 needs_dynsym_entry(needs_dynsym_entry_
)
1817 // The symbol value.
1819 // The symbol name. This points to the stringpool entry.
1822 unsigned int st_size
;
1823 // The output section index.
1824 unsigned int st_shndx
: 28;
1826 unsigned int st_type
: 4;
1827 // The index of the symbol in the output dynamic symbol table.
1828 unsigned int output_dynsym_index
: 31;
1829 // TRUE if the symbol needs to appear in the dynamic symbol table.
1830 unsigned int needs_dynsym_entry
: 1;
1833 // Return TRUE if this is an incremental (unchanged) input file.
1835 do_is_incremental() const
1838 // Return the last modified time of the file.
1841 { return this->input_reader_
.get_mtime(); }
1843 // Read the symbols.
1845 do_read_symbols(Read_symbols_data
*);
1847 // Lay out the input sections.
1849 do_layout(Symbol_table
*, Layout
*, Read_symbols_data
*);
1851 // Layout sections whose layout was deferred while waiting for
1852 // input files from a plugin.
1854 do_layout_deferred_sections(Layout
*);
1856 // Add the symbols to the symbol table.
1858 do_add_symbols(Symbol_table
*, Read_symbols_data
*, Layout
*);
1860 Archive::Should_include
1861 do_should_include_member(Symbol_table
* symtab
, Layout
*, Read_symbols_data
*,
1864 // Iterate over global symbols, calling a visitor class V for each.
1866 do_for_all_global_symbols(Read_symbols_data
* sd
,
1867 Library_base::Symbol_visitor_base
* v
);
1869 // Get the size of a section.
1871 do_section_size(unsigned int shndx
);
1873 // Get the name of a section.
1875 do_section_name(unsigned int shndx
);
1877 // Return a view of the contents of a section.
1879 do_section_contents(unsigned int shndx
);
1881 // Return section flags.
1883 do_section_flags(unsigned int shndx
);
1885 // Return section entsize.
1887 do_section_entsize(unsigned int shndx
);
1889 // Return section address.
1891 do_section_address(unsigned int shndx
);
1893 // Return section type.
1895 do_section_type(unsigned int shndx
);
1897 // Return the section link field.
1899 do_section_link(unsigned int shndx
);
1901 // Return the section link field.
1903 do_section_info(unsigned int shndx
);
1905 // Return the section alignment.
1907 do_section_addralign(unsigned int shndx
);
1909 // Return the Xindex structure to use.
1911 do_initialize_xindex();
1913 // Get symbol counts.
1915 do_get_global_symbol_counts(const Symbol_table
*, size_t*, size_t*) const;
1917 // Get global symbols.
1919 do_get_global_symbols() const
1920 { return &this->symbols_
; }
1922 // Return the number of local symbols.
1924 do_local_symbol_count() const
1925 { return this->local_symbol_count_
; }
1927 // Return the number of local symbols in the output symbol table.
1929 do_output_local_symbol_count() const
1930 { return this->local_symbol_count_
; }
1932 // Return the file offset for local symbols in the output symbol table.
1934 do_local_symbol_offset() const
1935 { return this->local_symbol_offset_
; }
1939 do_read_relocs(Read_relocs_data
*);
1941 // Process the relocs to find list of referenced sections. Used only
1942 // during garbage collection.
1944 do_gc_process_relocs(Symbol_table
*, Layout
*, Read_relocs_data
*);
1946 // Scan the relocs and adjust the symbol table.
1948 do_scan_relocs(Symbol_table
*, Layout
*, Read_relocs_data
*);
1950 // Count the local symbols.
1952 do_count_local_symbols(Stringpool_template
<char>*,
1953 Stringpool_template
<char>*);
1955 // Finalize the local symbols.
1957 do_finalize_local_symbols(unsigned int, off_t
, Symbol_table
*);
1959 // Set the offset where local dynamic symbol information will be stored.
1961 do_set_local_dynsym_indexes(unsigned int);
1963 // Set the offset where local dynamic symbol information will be stored.
1965 do_set_local_dynsym_offset(off_t
);
1967 // Relocate the input sections and write out the local symbols.
1969 do_relocate(const Symbol_table
* symtab
, const Layout
*, Output_file
* of
);
1971 // Set the offset of a section.
1973 do_set_section_offset(unsigned int shndx
, uint64_t off
);
1975 // The Incremental_binary base file.
1976 Sized_incremental_binary
<size
, big_endian
>* ibase_
;
1977 // The index of the object in the input file list.
1978 unsigned int input_file_index_
;
1979 // The reader for the input file.
1980 Input_entry_reader input_reader_
;
1981 // The number of local symbols.
1982 unsigned int local_symbol_count_
;
1983 // The number of local symbols which go into the output file's dynamic
1985 unsigned int output_local_dynsym_count_
;
1986 // This starting symbol index in the output symbol table.
1987 unsigned int local_symbol_index_
;
1988 // The file offset for local symbols in the output symbol table.
1989 unsigned int local_symbol_offset_
;
1990 // The file offset for local symbols in the output symbol table.
1991 unsigned int local_dynsym_offset_
;
1992 // The entries in the symbol table for the external symbols.
1994 // The offset of the first incremental relocation for this object.
1995 unsigned int incr_reloc_offset_
;
1996 // The number of incremental relocations for this object.
1997 unsigned int incr_reloc_count_
;
1998 // The index of the first incremental relocation for this object in the
1999 // updated output file.
2000 unsigned int incr_reloc_output_index_
;
2001 // A copy of the incremental relocations from this object.
2002 unsigned char* incr_relocs_
;
2003 // The local symbols.
2004 std::vector
<Local_symbol
> local_symbols_
;
2007 // An incremental Dynobj. This class represents a shared object that has
2008 // not changed since the last incremental link, and whose contents can be
2009 // used directly from the base file.
2011 template<int size
, bool big_endian
>
2012 class Sized_incr_dynobj
: public Dynobj
2015 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
2017 static const Address invalid_address
= static_cast<Address
>(0) - 1;
2019 Sized_incr_dynobj(const std::string
& name
,
2020 Sized_incremental_binary
<size
, big_endian
>* ibase
,
2021 unsigned int input_file_index
);
2024 typedef Incremental_inputs_reader
<size
, big_endian
> Inputs_reader
;
2025 typedef typename
Inputs_reader::Incremental_input_entry_reader
2028 // Return TRUE if this is an incremental (unchanged) input file.
2030 do_is_incremental() const
2033 // Return the last modified time of the file.
2036 { return this->input_reader_
.get_mtime(); }
2038 // Read the symbols.
2040 do_read_symbols(Read_symbols_data
*);
2042 // Lay out the input sections.
2044 do_layout(Symbol_table
*, Layout
*, Read_symbols_data
*);
2046 // Add the symbols to the symbol table.
2048 do_add_symbols(Symbol_table
*, Read_symbols_data
*, Layout
*);
2050 Archive::Should_include
2051 do_should_include_member(Symbol_table
* symtab
, Layout
*, Read_symbols_data
*,
2054 // Iterate over global symbols, calling a visitor class V for each.
2056 do_for_all_global_symbols(Read_symbols_data
* sd
,
2057 Library_base::Symbol_visitor_base
* v
);
2059 // Iterate over local symbols, calling a visitor class V for each GOT offset
2060 // associated with a local symbol.
2062 do_for_all_local_got_entries(Got_offset_list::Visitor
* v
) const;
2064 // Get the size of a section.
2066 do_section_size(unsigned int shndx
);
2068 // Get the name of a section.
2070 do_section_name(unsigned int shndx
);
2072 // Return a view of the contents of a section.
2074 do_section_contents(unsigned int shndx
);
2076 // Return section flags.
2078 do_section_flags(unsigned int shndx
);
2080 // Return section entsize.
2082 do_section_entsize(unsigned int shndx
);
2084 // Return section address.
2086 do_section_address(unsigned int shndx
);
2088 // Return section type.
2090 do_section_type(unsigned int shndx
);
2092 // Return the section link field.
2094 do_section_link(unsigned int shndx
);
2096 // Return the section link field.
2098 do_section_info(unsigned int shndx
);
2100 // Return the section alignment.
2102 do_section_addralign(unsigned int shndx
);
2104 // Return the Xindex structure to use.
2106 do_initialize_xindex();
2108 // Get symbol counts.
2110 do_get_global_symbol_counts(const Symbol_table
*, size_t*, size_t*) const;
2112 // Get global symbols.
2114 do_get_global_symbols() const
2115 { return &this->symbols_
; }
2117 // The Incremental_binary base file.
2118 Sized_incremental_binary
<size
, big_endian
>* ibase_
;
2119 // The index of the object in the input file list.
2120 unsigned int input_file_index_
;
2121 // The reader for the input file.
2122 Input_entry_reader input_reader_
;
2123 // The entries in the symbol table for the external symbols.
2127 // Allocate an incremental object of the appropriate size and endianness.
2129 make_sized_incremental_object(
2130 Incremental_binary
* base
,
2131 unsigned int input_file_index
,
2132 Incremental_input_type input_type
,
2133 const Incremental_binary::Input_reader
* input_reader
);
2135 // This class represents an Archive library (or --start-lib/--end-lib group)
2136 // that has not changed since the last incremental link. Its contents come
2137 // from the incremental inputs entry in the base file.
2139 class Incremental_library
: public Library_base
2142 Incremental_library(const char* filename
, unsigned int input_file_index
,
2143 const Incremental_binary::Input_reader
* input_reader
)
2144 : Library_base(NULL
), filename_(filename
),
2145 input_file_index_(input_file_index
), input_reader_(input_reader
),
2146 unused_symbols_(), is_reported_(false)
2149 // Return the input file index.
2151 input_file_index() const
2152 { return this->input_file_index_
; }
2154 // Return the serial number of the input file.
2157 { return this->input_reader_
->arg_serial(); }
2159 // Copy the unused symbols from the incremental input info.
2160 // We need to do this because we may be overwriting the incremental
2161 // input info in the base file before we write the new incremental
2164 copy_unused_symbols();
2166 // Return FALSE on the first call to indicate that the library needs
2167 // to be recorded; return TRUE subsequently.
2171 bool was_reported
= this->is_reported_
;
2172 is_reported_
= true;
2173 return was_reported
;
2177 typedef std::vector
<std::string
> Symbol_list
;
2182 { return this->filename_
; }
2184 // Return the modification time of the archive file.
2187 { return this->input_reader_
->get_mtime(); }
2189 // Iterator for unused global symbols in the library.
2191 do_for_all_unused_symbols(Symbol_visitor_base
* v
) const;
2193 // The name of the library.
2194 std::string filename_
;
2195 // The input file index of this library.
2196 unsigned int input_file_index_
;
2197 // A reader for the incremental input information.
2198 const Incremental_binary::Input_reader
* input_reader_
;
2199 // List of unused symbols defined in this library.
2200 Symbol_list unused_symbols_
;
2201 // TRUE when this library has been reported to the new incremental info.
2205 } // End namespace gold.
2207 #endif // !defined(GOLD_INCREMENTAL_H)