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_archive_entry
;
44 class Incremental_inputs
;
45 class Incremental_binary
;
48 // Incremental input type as stored in .gnu_incremental_inputs.
50 enum Incremental_input_type
52 INCREMENTAL_INPUT_OBJECT
= 1,
53 INCREMENTAL_INPUT_ARCHIVE_MEMBER
= 2,
54 INCREMENTAL_INPUT_ARCHIVE
= 3,
55 INCREMENTAL_INPUT_SHARED_LIBRARY
= 4,
56 INCREMENTAL_INPUT_SCRIPT
= 5
59 // Create an Incremental_binary object for FILE. Returns NULL is this is not
60 // possible, e.g. FILE is not an ELF file or has an unsupported target.
63 open_incremental_binary(Output_file
* file
);
65 // Code invoked early during an incremental link that checks what files need
68 class Incremental_checker
71 // Check if the file named OUTPUT_NAME can be linked incrementally.
72 // INCREMENTAL_INPUTS must have the canonical form of the command line
73 // and input arguments filled - at this point of linking other fields are
74 // probably not filled yet. TODO: for inputs that don't need to be
75 // rebuilt, this function should fill the incremental input information.
76 Incremental_checker(const char* output_name
,
77 Incremental_inputs
* incremental_inputs
)
78 : output_name_(output_name
), incremental_inputs_(incremental_inputs
)
81 // Analyzes the output file to check if incremental linking is possible and
82 // what files needs to be relinked.
84 can_incrementally_link_output_file();
87 // Name of the output file to analyze.
88 const char* output_name_
;
90 // The Incremental_inputs object. At this stage of link, only the command
91 // line and inputs are filled.
92 Incremental_inputs
* incremental_inputs_
;
95 // Base class for recording each input file.
97 class Incremental_input_entry
100 Incremental_input_entry(Stringpool::Key filename_key
, Timespec mtime
)
101 : filename_key_(filename_key
), offset_(0), info_offset_(0), mtime_(mtime
)
105 ~Incremental_input_entry()
108 // Return the type of input file.
109 Incremental_input_type
111 { return this->do_type(); }
113 // Set the section offset of this input file entry.
115 set_offset(unsigned int offset
)
116 { this->offset_
= offset
; }
118 // Set the section offset of the supplemental information for this entry.
120 set_info_offset(unsigned int info_offset
)
121 { this->info_offset_
= info_offset
; }
123 // Get the section offset of this input file entry.
126 { return this->offset_
; }
128 // Get the section offset of the supplemental information for this entry.
130 get_info_offset() const
131 { return this->info_offset_
; }
133 // Get the stringpool key for the input filename.
135 get_filename_key() const
136 { return this->filename_key_
; }
138 // Get the modification time of the input file.
141 { return this->mtime_
; }
143 // Return a pointer to the derived Incremental_script_entry object.
144 // Return NULL for input entries that are not script files.
145 Incremental_script_entry
*
147 { return this->do_script_entry(); }
149 // Return a pointer to the derived Incremental_object_entry object.
150 // Return NULL for input entries that are not object files.
151 Incremental_object_entry
*
153 { return this->do_object_entry(); }
155 // Return a pointer to the derived Incremental_archive_entry object.
156 // Return NULL for input entries that are not archive files.
157 Incremental_archive_entry
*
159 { return this->do_archive_entry(); }
162 // Return the type of input file.
163 virtual Incremental_input_type
166 // Return a pointer to the derived Incremental_script_entry object.
167 // Return NULL for input entries that are not script files.
168 virtual Incremental_script_entry
*
172 // Return a pointer to the derived Incremental_object_entry object.
173 // Return NULL for input entries that are not object files.
174 virtual Incremental_object_entry
*
178 // Return a pointer to the derived Incremental_archive_entry object.
179 // Return NULL for input entries that are not archive files.
180 virtual Incremental_archive_entry
*
185 // Key of the filename string in the section stringtable.
186 Stringpool::Key filename_key_
;
188 // Offset of the entry in the output section.
189 unsigned int offset_
;
191 // Offset of the extra information in the output section.
192 unsigned int info_offset_
;
194 // Last modification time of the file.
198 // Class for recording input scripts.
200 class Incremental_script_entry
: public Incremental_input_entry
203 Incremental_script_entry(Stringpool::Key filename_key
, Script_info
* script
,
205 : Incremental_input_entry(filename_key
, mtime
), script_(script
), objects_()
208 // Add a member object to the archive.
210 add_object(Incremental_input_entry
* obj_entry
)
212 this->objects_
.push_back(obj_entry
);
215 // Return the number of objects included by this script.
218 { return this->objects_
.size(); }
220 // Return the Nth object.
221 Incremental_input_entry
*
222 get_object(unsigned int n
)
224 gold_assert(n
< this->objects_
.size());
225 return this->objects_
[n
];
229 virtual Incremental_input_type
231 { return INCREMENTAL_INPUT_SCRIPT
; }
233 // Return a pointer to the derived Incremental_script_entry object.
234 virtual Incremental_script_entry
*
239 // Information about the script file.
240 Script_info
* script_
;
241 // Objects that have been included by this script.
242 std::vector
<Incremental_input_entry
*> objects_
;
245 // Class for recording input object files.
247 class Incremental_object_entry
: public Incremental_input_entry
250 Incremental_object_entry(Stringpool::Key filename_key
, Object
* obj
,
252 : Incremental_input_entry(filename_key
, mtime
), obj_(obj
),
253 is_member_(false), sections_()
255 if (!obj_
->is_dynamic())
256 this->sections_
.reserve(obj
->shnum());
262 { return this->obj_
; }
264 // Record that this object is an archive member.
267 { this->is_member_
= true; }
269 // Return true if this object is an archive member.
272 { return this->is_member_
; }
274 // Add an input section.
276 add_input_section(unsigned int shndx
, Stringpool::Key name_key
, off_t sh_size
)
278 if (shndx
>= this->sections_
.size())
279 this->sections_
.resize(shndx
+ 1);
280 this->sections_
[shndx
].name_key
= name_key
;
281 this->sections_
[shndx
].sh_size
= sh_size
;
284 // Return the number of input sections in this object.
286 get_input_section_count() const
287 { return this->sections_
.size(); }
289 // Return the stringpool key of the Nth input section.
291 get_input_section_name_key(unsigned int n
) const
292 { return this->sections_
[n
].name_key
; }
294 // Return the size of the Nth input section.
296 get_input_section_size(unsigned int n
) const
297 { return this->sections_
[n
].sh_size
; }
300 virtual Incremental_input_type
303 return (this->is_member_
304 ? INCREMENTAL_INPUT_ARCHIVE_MEMBER
305 : (this->obj_
->is_dynamic()
306 ? INCREMENTAL_INPUT_SHARED_LIBRARY
307 : INCREMENTAL_INPUT_OBJECT
));
310 // Return a pointer to the derived Incremental_object_entry object.
311 virtual Incremental_object_entry
*
316 // The object file itself.
319 // Whether this object is an archive member.
325 Stringpool::Key name_key
;
328 std::vector
<Input_section
> sections_
;
331 // Class for recording archive library input files.
333 class Incremental_archive_entry
: public Incremental_input_entry
336 Incremental_archive_entry(Stringpool::Key filename_key
, Timespec mtime
)
337 : Incremental_input_entry(filename_key
, mtime
), members_(), unused_syms_()
340 // Add a member object to the archive.
342 add_object(Incremental_object_entry
* obj_entry
)
344 this->members_
.push_back(obj_entry
);
345 obj_entry
->set_is_member();
348 // Add an unused global symbol to the archive.
350 add_unused_global_symbol(Stringpool::Key symbol_key
)
351 { this->unused_syms_
.push_back(symbol_key
); }
353 // Return the number of member objects included in the link.
356 { return this->members_
.size(); }
358 // Return the Nth member object.
359 Incremental_object_entry
*
360 get_member(unsigned int n
)
361 { return this->members_
[n
]; }
363 // Return the number of unused global symbols in this archive.
365 get_unused_global_symbol_count()
366 { return this->unused_syms_
.size(); }
368 // Return the Nth unused global symbol.
370 get_unused_global_symbol(unsigned int n
)
371 { return this->unused_syms_
[n
]; }
374 virtual Incremental_input_type
376 { return INCREMENTAL_INPUT_ARCHIVE
; }
378 // Return a pointer to the derived Incremental_archive_entry object.
379 virtual Incremental_archive_entry
*
384 // Members of the archive that have been included in the link.
385 std::vector
<Incremental_object_entry
*> members_
;
387 // Unused global symbols from this archive.
388 std::vector
<Stringpool::Key
> unused_syms_
;
391 // This class contains the information needed during an incremental
392 // build about the inputs necessary to build the .gnu_incremental_inputs.
394 class Incremental_inputs
397 typedef std::vector
<Incremental_input_entry
*> Input_list
;
400 : inputs_(), command_line_(), command_line_key_(0),
401 strtab_(new Stringpool()), current_object_(NULL
),
402 current_object_entry_(NULL
), inputs_section_(NULL
),
403 symtab_section_(NULL
), relocs_section_(NULL
),
407 ~Incremental_inputs() { delete this->strtab_
; }
409 // Record the command line.
411 report_command_line(int argc
, const char* const* argv
);
413 // Record the initial info for archive file ARCHIVE.
415 report_archive_begin(Library_base
* arch
, Script_info
* script_info
);
417 // Record the final info for archive file ARCHIVE.
419 report_archive_end(Library_base
* arch
);
421 // Record the info for object file OBJ. If ARCH is not NULL,
422 // attach the object file to the archive.
424 report_object(Object
* obj
, Library_base
* arch
, Script_info
* script_info
);
426 // Record an input section belonging to object file OBJ.
428 report_input_section(Object
* obj
, unsigned int shndx
, const char* name
,
431 // Record the info for input script SCRIPT.
433 report_script(const std::string
& filename
, Script_info
* script
,
436 // Return the running count of incremental relocations.
438 get_reloc_count() const
439 { return this->reloc_count_
; }
441 // Update the running count of incremental relocations.
443 set_reloc_count(unsigned int count
)
444 { this->reloc_count_
= count
; }
446 // Prepare for layout. Called from Layout::finalize.
450 // Create the .gnu_incremental_inputs and related sections.
452 create_data_sections(Symbol_table
* symtab
);
454 // Return the .gnu_incremental_inputs section.
456 inputs_section() const
457 { return this->inputs_section_
; }
459 // Return the .gnu_incremental_symtab section.
461 symtab_section() const
462 { return this->symtab_section_
; }
464 // Return the .gnu_incremental_relocs section.
466 relocs_section() const
467 { return this->relocs_section_
; }
469 // Return the .gnu_incremental_got_plt section.
471 got_plt_section() const
472 { return this->got_plt_section_
; }
474 // Return the .gnu_incremental_strtab stringpool.
476 get_stringpool() const
477 { return this->strtab_
; }
479 // Return the canonical form of the command line, as will be stored in
480 // .gnu_incremental_strtab.
483 { return this->command_line_
; }
485 // Return the stringpool key of the command line.
487 command_line_key() const
488 { return this->command_line_key_
; }
490 // Return the number of input files.
492 input_file_count() const
493 { return this->inputs_
.size(); }
495 // Return the input files.
498 { return this->inputs_
; }
500 // Return the sh_entsize value for the .gnu_incremental_relocs section.
502 relocs_entsize() const;
505 // The list of input files.
508 // Canonical form of the command line, as will be stored in
509 // .gnu_incremental_strtab.
510 std::string command_line_
;
512 // The key of the command line string in the string pool.
513 Stringpool::Key command_line_key_
;
515 // The .gnu_incremental_strtab string pool associated with the
516 // .gnu_incremental_inputs.
519 // Keep track of the object currently being processed.
520 Object
* current_object_
;
521 Incremental_object_entry
* current_object_entry_
;
523 // The .gnu_incremental_inputs section.
524 Output_section_data
* inputs_section_
;
526 // The .gnu_incremental_symtab section.
527 Output_data_space
* symtab_section_
;
529 // The .gnu_incremental_relocs section.
530 Output_data_space
* relocs_section_
;
532 // The .gnu_incremental_got_plt section.
533 Output_data_space
* got_plt_section_
;
535 // Total count of incremental relocations. Updated during Scan_relocs
536 // phase at the completion of each object file.
537 unsigned int reloc_count_
;
540 // Reader class for .gnu_incremental_inputs section.
542 template<int size
, bool big_endian
>
543 class Incremental_inputs_reader
546 typedef elfcpp::Swap
<size
, big_endian
> Swap
;
547 typedef elfcpp::Swap
<16, big_endian
> Swap16
;
548 typedef elfcpp::Swap
<32, big_endian
> Swap32
;
549 typedef elfcpp::Swap
<64, big_endian
> Swap64
;
552 Incremental_inputs_reader()
553 : p_(NULL
), strtab_(NULL
, 0), input_file_count_(0)
556 Incremental_inputs_reader(const unsigned char* p
,
557 const elfcpp::Elf_strtab
& strtab
)
558 : p_(p
), strtab_(strtab
)
559 { this->input_file_count_
= Swap32::readval(this->p_
+ 4); }
561 // Return the version number.
564 { return Swap32::readval(this->p_
); }
566 // Return the count of input file entries.
568 input_file_count() const
569 { return this->input_file_count_
; }
571 // Return the command line.
575 unsigned int offset
= Swap32::readval(this->p_
+ 8);
576 return this->get_string(offset
);
579 // Reader class for an input file entry and its supplemental info.
580 class Incremental_input_entry_reader
583 Incremental_input_entry_reader(const Incremental_inputs_reader
* inputs
,
585 : inputs_(inputs
), offset_(offset
)
587 this->info_offset_
= Swap32::readval(inputs
->p_
+ offset
+ 4);
588 int type
= Swap16::readval(this->inputs_
->p_
+ offset
+ 20);
589 this->type_
= static_cast<Incremental_input_type
>(type
);
592 // Return the filename.
596 unsigned int offset
= Swap32::readval(this->inputs_
->p_
+ this->offset_
);
597 return this->inputs_
->get_string(offset
);
600 // Return the timestamp.
605 const unsigned char* p
= this->inputs_
->p_
+ this->offset_
+ 8;
606 t
.seconds
= Swap64::readval(p
);
607 t
.nanoseconds
= Swap32::readval(p
+8);
611 // Return the type of input file.
612 Incremental_input_type
614 { return this->type_
; }
616 // Return the input section count -- for objects only.
618 get_input_section_count() const
620 gold_assert(this->type_
== INCREMENTAL_INPUT_OBJECT
621 || this->type_
== INCREMENTAL_INPUT_ARCHIVE_MEMBER
);
622 return Swap32::readval(this->inputs_
->p_
+ this->info_offset_
);
625 // Return the offset of the supplemental info for symbol SYMNDX --
628 get_symbol_offset(unsigned int symndx
) const
630 gold_assert(this->type_
== INCREMENTAL_INPUT_OBJECT
631 || this->type_
== INCREMENTAL_INPUT_ARCHIVE_MEMBER
);
633 unsigned int section_count
= this->get_input_section_count();
634 return (this->info_offset_
+ 8
635 + section_count
* input_section_entry_size
639 // Return the global symbol count -- for objects & shared libraries only.
641 get_global_symbol_count() const
645 case INCREMENTAL_INPUT_OBJECT
:
646 case INCREMENTAL_INPUT_ARCHIVE_MEMBER
:
647 return Swap32::readval(this->inputs_
->p_
+ this->info_offset_
+ 4);
648 case INCREMENTAL_INPUT_SHARED_LIBRARY
:
649 return Swap32::readval(this->inputs_
->p_
+ this->info_offset_
);
655 // Return the object count -- for scripts only.
657 get_object_count() const
659 gold_assert(this->type_
== INCREMENTAL_INPUT_SCRIPT
);
660 return Swap32::readval(this->inputs_
->p_
+ this->info_offset_
);
663 // Return the input file offset for object N -- for scripts only.
665 get_object_offset(unsigned int n
) const
667 gold_assert(this->type_
== INCREMENTAL_INPUT_SCRIPT
);
668 return Swap32::readval(this->inputs_
->p_
+ this->info_offset_
672 // Return the member count -- for archives only.
674 get_member_count() const
676 gold_assert(this->type_
== INCREMENTAL_INPUT_ARCHIVE
);
677 return Swap32::readval(this->inputs_
->p_
+ this->info_offset_
);
680 // Return the unused symbol count -- for archives only.
682 get_unused_symbol_count() const
684 gold_assert(this->type_
== INCREMENTAL_INPUT_ARCHIVE
);
685 return Swap32::readval(this->inputs_
->p_
+ this->info_offset_
+ 4);
688 // Return the input file offset for archive member N -- for archives only.
690 get_member_offset(unsigned int n
) const
692 gold_assert(this->type_
== INCREMENTAL_INPUT_ARCHIVE
);
693 return Swap32::readval(this->inputs_
->p_
+ this->info_offset_
697 // Return the Nth unused global symbol -- for archives only.
699 get_unused_symbol(unsigned int n
) const
701 gold_assert(this->type_
== INCREMENTAL_INPUT_ARCHIVE
);
702 unsigned int member_count
= this->get_member_count();
703 unsigned int offset
= Swap32::readval(this->inputs_
->p_
704 + this->info_offset_
+ 8
707 return this->inputs_
->get_string(offset
);
710 // Information about an input section.
711 struct Input_section_info
714 unsigned int output_shndx
;
719 // Return info about the Nth input section -- for objects only.
721 get_input_section(unsigned int n
) const
723 Input_section_info info
;
724 const unsigned char* p
= (this->inputs_
->p_
725 + this->info_offset_
+ 8
726 + n
* input_section_entry_size
);
727 unsigned int name_offset
= Swap32::readval(p
);
728 info
.name
= this->inputs_
->get_string(name_offset
);
729 info
.output_shndx
= Swap32::readval(p
+ 4);
730 info
.sh_offset
= Swap::readval(p
+ 8);
731 info
.sh_size
= Swap::readval(p
+ 8 + size
/ 8);
735 // Information about a global symbol.
736 struct Global_symbol_info
738 unsigned int output_symndx
;
739 unsigned int next_offset
;
740 unsigned int reloc_count
;
741 unsigned int reloc_offset
;
744 // Return info about the Nth global symbol -- for objects only.
746 get_global_symbol_info(unsigned int n
) const
748 Global_symbol_info info
;
749 unsigned int section_count
= this->get_input_section_count();
750 const unsigned char* p
= (this->inputs_
->p_
751 + this->info_offset_
+ 8
752 + section_count
* input_section_entry_size
754 info
.output_symndx
= Swap32::readval(p
);
755 info
.next_offset
= Swap32::readval(p
+ 4);
756 info
.reloc_count
= Swap::readval(p
+ 8);
757 info
.reloc_offset
= Swap::readval(p
+ 12);
762 // Size of an input section entry.
763 static const unsigned int input_section_entry_size
= 8 + 2 * size
/ 8;
764 // The reader instance for the containing section.
765 const Incremental_inputs_reader
* inputs_
;
766 // The type of input file.
767 Incremental_input_type type_
;
768 // Section offset to the input file entry.
769 unsigned int offset_
;
770 // Section offset to the supplemental info for the input file.
771 unsigned int info_offset_
;
774 // Return a reader for the Nth input file entry.
775 Incremental_input_entry_reader
776 input_file(unsigned int n
) const
778 gold_assert(n
< this->input_file_count_
);
779 Incremental_input_entry_reader
input(this, 16 + n
* 24);
784 // Lookup a string in the ELF string table.
785 const char* get_string(unsigned int offset
) const
788 if (this->strtab_
.get_c_string(offset
, &s
))
793 // Base address of the .gnu_incremental_inputs section.
794 const unsigned char* p_
;
795 // The associated ELF string table.
796 elfcpp::Elf_strtab strtab_
;
797 // The number of input file entries in this section.
798 unsigned int input_file_count_
;
801 // Reader class for the .gnu_incremental_symtab section.
803 template<bool big_endian
>
804 class Incremental_symtab_reader
807 Incremental_symtab_reader()
811 Incremental_symtab_reader(const unsigned char* p
, off_t len
)
815 // Return the count of symbols in this section.
818 { return static_cast<unsigned int>(this->len_
/ 4); }
820 // Return the list head for symbol table entry N.
822 get_list_head(unsigned int n
) const
823 { return elfcpp::Swap
<32, big_endian
>::readval(this->p_
+ 4 * n
); }
826 // Base address of the .gnu_incremental_relocs section.
827 const unsigned char* p_
;
828 // Size of the section.
832 // Reader class for the .gnu_incremental_relocs section.
834 template<int size
, bool big_endian
>
835 class Incremental_relocs_reader
838 // Size of each field.
839 static const unsigned int field_size
= size
/ 8;
842 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
843 typedef typename
elfcpp::Elf_types
<size
>::Elf_Swxword Addend
;
845 // Size of each entry.
846 static const unsigned int reloc_size
= 8 + 2 * field_size
;
848 Incremental_relocs_reader()
852 Incremental_relocs_reader(const unsigned char* p
, off_t len
)
856 // Return the count of relocations in this section.
859 { return static_cast<unsigned int>(this->len_
/ reloc_size
); }
861 // Return the relocation type for relocation entry at offset OFF.
863 get_r_type(unsigned int off
) const
865 return elfcpp::Swap
<32, big_endian
>::readval(this->p_
+ off
);
868 // Return the output section index for relocation entry at offset OFF.
870 get_r_shndx(unsigned int off
) const
872 return elfcpp::Swap
<32, big_endian
>::readval(this->p_
+ off
+ 4);
875 // Return the output section offset for relocation entry at offset OFF.
877 get_r_offset(unsigned int off
) const
879 return elfcpp::Swap
<size
, big_endian
>::readval(this->p_
+ off
+ 8);
882 // Return the addend for relocation entry at offset OFF.
884 get_r_addend(unsigned int off
) const
886 return elfcpp::Swap
<size
, big_endian
>::readval(this->p_
+ off
+ 8
891 // Base address of the .gnu_incremental_relocs section.
892 const unsigned char* p_
;
893 // Size of the section.
897 // Reader class for the .gnu_incremental_got_plt section.
899 template<bool big_endian
>
900 class Incremental_got_plt_reader
903 Incremental_got_plt_reader()
904 : p_(NULL
), got_count_(0), got_desc_p_(NULL
), plt_desc_p_(NULL
)
907 Incremental_got_plt_reader(const unsigned char* p
) : p_(p
)
909 this->got_count_
= elfcpp::Swap
<32, big_endian
>::readval(p
);
910 this->got_desc_p_
= p
+ 8 + ((this->got_count_
+ 3) & ~3);
911 this->plt_desc_p_
= this->got_desc_p_
+ this->got_count_
* 4;
914 // Return the GOT entry count.
916 get_got_entry_count() const
918 return this->got_count_
;
921 // Return the PLT entry count.
923 get_plt_entry_count() const
925 return elfcpp::Swap
<32, big_endian
>::readval(this->p_
+ 4);
928 // Return the GOT type for GOT entry N.
930 get_got_type(unsigned int n
)
932 return this->p_
[8 + n
];
935 // Return the GOT descriptor for GOT entry N.
937 get_got_desc(unsigned int n
)
939 return elfcpp::Swap
<32, big_endian
>::readval(this->got_desc_p_
+ n
* 4);
942 // Return the PLT descriptor for PLT entry N.
944 get_plt_desc(unsigned int n
)
946 return elfcpp::Swap
<32, big_endian
>::readval(this->plt_desc_p_
+ n
* 4);
950 // Base address of the .gnu_incremental_got_plt section.
951 const unsigned char* p_
;
953 unsigned int got_count_
;
954 // Base address of the GOT descriptor array.
955 const unsigned char* got_desc_p_
;
956 // Base address of the PLT descriptor array.
957 const unsigned char* plt_desc_p_
;
960 // An object representing the ELF file we edit during an incremental build.
961 // Similar to Object or Dynobj, but operates on Output_file and contains
962 // methods to support incremental updating. This is the abstract parent class
963 // implemented in Sized_incremental_binary<size, big_endian> for a specific
964 // endianness and size.
966 class Incremental_binary
969 Incremental_binary(Output_file
* output
, Target
* target
)
970 : output_(output
), target_(target
)
974 ~Incremental_binary()
977 // Check the .gnu_incremental_inputs section to see whether an incremental
978 // build is possible.
980 check_inputs(Incremental_inputs
* incremental_inputs
)
981 { return this->do_check_inputs(incremental_inputs
); }
983 // Return TRUE if the file specified by INPUT_ARGUMENT is unchanged
984 // with respect to the base file.
986 file_is_unchanged(const Input_argument
* input_argument
) const
987 { return this->do_file_is_unchanged(input_argument
); }
991 error(const char* format
, ...) const ATTRIBUTE_PRINTF_2
;
993 // Wrapper class for a sized Incremental_input_entry_reader.
1007 { return this->do_filename(); }
1011 { return this->do_get_mtime(); }
1013 Incremental_input_type
1015 { return this->do_type(); }
1019 do_filename() const = 0;
1022 do_get_mtime() const = 0;
1024 virtual Incremental_input_type
1025 do_type() const = 0;
1029 get_input_reader(const char* filename
)
1030 { return this->do_get_input_reader(filename
); }
1032 // Functions and types for the elfcpp::Elf_file interface. This
1033 // permit us to use Incremental_binary as the File template parameter for
1034 // elfcpp::Elf_file.
1036 // The View class is returned by view. It must support a single
1037 // method, data(). This is trivial, because Output_file::get_output_view
1038 // does what we need.
1042 View(const unsigned char* p
)
1046 const unsigned char*
1048 { return this->p_
; }
1051 const unsigned char* p_
;
1056 view(off_t file_offset
, section_size_type data_size
)
1057 { return View(this->output_
->get_input_view(file_offset
, data_size
)); }
1059 // A location in the file.
1065 Location(off_t fo
, section_size_type ds
)
1066 : file_offset(fo
), data_size(ds
)
1070 : file_offset(0), data_size(0)
1074 // Get a View given a Location.
1077 { return View(this->view(loc
.file_offset
, loc
.data_size
)); }
1080 // Check the .gnu_incremental_inputs section to see whether an incremental
1081 // build is possible.
1083 do_check_inputs(Incremental_inputs
* incremental_inputs
) = 0;
1085 // Return TRUE if the file specified by INPUT_ARGUMENT is unchanged
1086 // with respect to the base file.
1088 do_file_is_unchanged(const Input_argument
* input_argument
) const = 0;
1090 virtual Input_reader
*
1091 do_get_input_reader(const char* filename
) = 0;
1094 // Edited output file object.
1095 Output_file
* output_
;
1096 // Target of the output file.
1100 template<int size
, bool big_endian
>
1101 class Sized_incremental_binary
: public Incremental_binary
1104 Sized_incremental_binary(Output_file
* output
,
1105 const elfcpp::Ehdr
<size
, big_endian
>& ehdr
,
1107 : Incremental_binary(output
, target
), elf_file_(this, ehdr
),
1108 has_incremental_info_(false), inputs_reader_(), symtab_reader_(),
1109 relocs_reader_(), got_plt_reader_(), current_input_file_(0)
1110 { this->setup_readers(); }
1112 // Returns TRUE if the file contains incremental info.
1114 has_incremental_info() const
1115 { return this->has_incremental_info_
; }
1117 // Readers for the incremental info sections.
1119 Incremental_inputs_reader
<size
, big_endian
>
1120 inputs_reader() const
1121 { return this->inputs_reader_
; }
1123 Incremental_symtab_reader
<big_endian
>
1124 symtab_reader() const
1125 { return this->symtab_reader_
; }
1127 Incremental_relocs_reader
<size
, big_endian
>
1128 relocs_reader() const
1129 { return this->relocs_reader_
; }
1131 Incremental_got_plt_reader
<big_endian
>
1132 got_plt_reader() const
1133 { return this->got_plt_reader_
; }
1137 do_check_inputs(Incremental_inputs
* incremental_inputs
);
1139 // Return TRUE if the file specified by INPUT_ARGUMENT is unchanged
1140 // with respect to the base file.
1142 do_file_is_unchanged(const Input_argument
* input_argument
) const;
1144 // Wrapper class for a sized Incremental_input_entry_reader.
1146 class Sized_input_reader
: public Input_reader
1149 typedef Incremental_inputs_reader
<size
, big_endian
> Inputs_reader
;
1150 typedef typename
Inputs_reader::Incremental_input_entry_reader
1153 Sized_input_reader(Input_entry_reader r
)
1154 : Input_reader(), reader_(r
)
1158 ~Sized_input_reader()
1164 { return this->reader_
.filename(); }
1167 do_get_mtime() const
1168 { return this->reader_
.get_mtime(); }
1170 Incremental_input_type
1172 { return this->reader_
.type(); }
1174 Input_entry_reader reader_
;
1177 virtual Input_reader
*
1178 do_get_input_reader(const char* filename
);
1182 find_incremental_inputs_sections(unsigned int* p_inputs_shndx
,
1183 unsigned int* p_symtab_shndx
,
1184 unsigned int* p_relocs_shndx
,
1185 unsigned int* p_got_plt_shndx
,
1186 unsigned int* p_strtab_shndx
);
1191 // Output as an ELF file.
1192 elfcpp::Elf_file
<size
, big_endian
, Incremental_binary
> elf_file_
;
1194 // Readers for the incremental info sections.
1195 bool has_incremental_info_
;
1196 Incremental_inputs_reader
<size
, big_endian
> inputs_reader_
;
1197 Incremental_symtab_reader
<big_endian
> symtab_reader_
;
1198 Incremental_relocs_reader
<size
, big_endian
> relocs_reader_
;
1199 Incremental_got_plt_reader
<big_endian
> got_plt_reader_
;
1201 // Index of the current input file entry.
1202 int current_input_file_
;
1205 } // End namespace gold.
1207 #endif // !defined(GOLD_INCREMENTAL_H)