1 // object.h -- support for an object file for linking in gold -*- C++ -*-
3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
30 #include "elfcpp_file.h"
38 class General_options
;
45 class Output_symtab_xindex
;
48 class Object_merge_map
;
49 class Relocatable_relocs
;
52 template<typename Stringpool_char
>
53 class Stringpool_template
;
55 // Data to pass from read_symbols() to add_symbols().
57 struct Read_symbols_data
60 : section_headers(NULL
), section_names(NULL
), symbols(NULL
),
61 symbol_names(NULL
), versym(NULL
), verdef(NULL
), verneed(NULL
)
67 File_view
* section_headers
;
69 File_view
* section_names
;
70 // Size of section name data in bytes.
71 section_size_type section_names_size
;
74 // Size of symbol data in bytes.
75 section_size_type symbols_size
;
76 // Offset of external symbols within symbol data. This structure
77 // sometimes contains only external symbols, in which case this will
78 // be zero. Sometimes it contains all symbols.
79 section_offset_type external_symbols_offset
;
81 File_view
* symbol_names
;
82 // Size of symbol name data in bytes.
83 section_size_type symbol_names_size
;
85 // Version information. This is only used on dynamic objects.
86 // Version symbol data (from SHT_GNU_versym section).
88 section_size_type versym_size
;
89 // Version definition data (from SHT_GNU_verdef section).
91 section_size_type verdef_size
;
92 unsigned int verdef_info
;
93 // Needed version data (from SHT_GNU_verneed section).
95 section_size_type verneed_size
;
96 unsigned int verneed_info
;
99 // Information used to print error messages.
101 struct Symbol_location_info
103 std::string source_file
;
104 std::string enclosing_symbol_name
;
108 // Data about a single relocation section. This is read in
109 // read_relocs and processed in scan_relocs.
111 struct Section_relocs
118 { delete this->contents
; }
120 // Index of reloc section.
121 unsigned int reloc_shndx
;
122 // Index of section that relocs apply to.
123 unsigned int data_shndx
;
124 // Contents of reloc section.
126 // Reloc section type.
127 unsigned int sh_type
;
128 // Number of reloc entries.
131 Output_section
* output_section
;
132 // Whether this section has special handling for offsets.
133 bool needs_special_offset_handling
;
134 // Whether the data section is allocated (has the SHF_ALLOC flag set).
135 bool is_data_section_allocated
;
138 // Relocations in an object file. This is read in read_relocs and
139 // processed in scan_relocs.
141 struct Read_relocs_data
144 : local_symbols(NULL
)
148 { delete this->local_symbols
; }
150 typedef std::vector
<Section_relocs
> Relocs_list
;
153 // The local symbols.
154 File_view
* local_symbols
;
157 // The Xindex class manages section indexes for objects with more than
163 Xindex(int large_shndx_offset
)
164 : large_shndx_offset_(large_shndx_offset
), symtab_xindex_()
167 // Initialize the symtab_xindex_ array, given the object and the
168 // section index of the symbol table to use.
169 template<int size
, bool big_endian
>
171 initialize_symtab_xindex(Object
*, unsigned int symtab_shndx
);
173 // Read in the symtab_xindex_ array, given its section index.
174 // PSHDRS may optionally point to the section headers.
175 template<int size
, bool big_endian
>
177 read_symtab_xindex(Object
*, unsigned int xindex_shndx
,
178 const unsigned char* pshdrs
);
180 // Symbol SYMNDX in OBJECT has a section of SHN_XINDEX; return the
181 // real section index.
183 sym_xindex_to_shndx(Object
* object
, unsigned int symndx
);
186 // The type of the array giving the real section index for symbols
187 // whose st_shndx field holds SHN_XINDEX.
188 typedef std::vector
<unsigned int> Symtab_xindex
;
190 // Adjust a section index if necessary. This should only be called
191 // for ordinary section indexes.
193 adjust_shndx(unsigned int shndx
)
195 if (shndx
>= elfcpp::SHN_LORESERVE
)
196 shndx
+= this->large_shndx_offset_
;
200 // Adjust to apply to large section indexes.
201 int large_shndx_offset_
;
202 // The data from the SHT_SYMTAB_SHNDX section.
203 Symtab_xindex symtab_xindex_
;
206 // A GOT offset list. A symbol may have more than one GOT offset
207 // (e.g., when mixing modules compiled with two different TLS models),
208 // but will usually have at most one. GOT_TYPE identifies the type of
209 // GOT entry; its values are specific to each target.
211 class Got_offset_list
215 : got_type_(-1U), got_offset_(0), got_next_(NULL
)
218 Got_offset_list(unsigned int got_type
, unsigned int got_offset
)
219 : got_type_(got_type
), got_offset_(got_offset
), got_next_(NULL
)
224 if (this->got_next_
!= NULL
)
226 delete this->got_next_
;
227 this->got_next_
= NULL
;
231 // Initialize the fields to their default values.
235 this->got_type_
= -1U;
236 this->got_offset_
= 0;
237 this->got_next_
= NULL
;
240 // Set the offset for the GOT entry of type GOT_TYPE.
242 set_offset(unsigned int got_type
, unsigned int got_offset
)
244 if (this->got_type_
== -1U)
246 this->got_type_
= got_type
;
247 this->got_offset_
= got_offset
;
251 for (Got_offset_list
* g
= this; g
!= NULL
; g
= g
->got_next_
)
253 if (g
->got_type_
== got_type
)
255 g
->got_offset_
= got_offset
;
259 Got_offset_list
* g
= new Got_offset_list(got_type
, got_offset
);
260 g
->got_next_
= this->got_next_
;
265 // Return the offset for a GOT entry of type GOT_TYPE.
267 get_offset(unsigned int got_type
) const
269 for (const Got_offset_list
* g
= this; g
!= NULL
; g
= g
->got_next_
)
271 if (g
->got_type_
== got_type
)
272 return g
->got_offset_
;
277 // Return a pointer to the list, or NULL if the list is empty.
278 const Got_offset_list
*
281 if (this->got_type_
== -1U)
286 // Abstract visitor class for iterating over GOT offsets.
298 visit(unsigned int, unsigned int) = 0;
301 // Loop over all GOT offset entries, calling a visitor class V for each.
303 for_all_got_offsets(Visitor
* v
) const
305 if (this->got_type_
== -1U)
307 for (const Got_offset_list
* g
= this; g
!= NULL
; g
= g
->got_next_
)
308 v
->visit(g
->got_type_
, g
->got_offset_
);
312 unsigned int got_type_
;
313 unsigned int got_offset_
;
314 Got_offset_list
* got_next_
;
317 // Object is an abstract base class which represents either a 32-bit
318 // or a 64-bit input object. This can be a regular object file
319 // (ET_REL) or a shared object (ET_DYN).
324 typedef std::vector
<Symbol
*> Symbols
;
326 // NAME is the name of the object as we would report it to the user
327 // (e.g., libfoo.a(bar.o) if this is in an archive. INPUT_FILE is
328 // used to read the file. OFFSET is the offset within the input
329 // file--0 for a .o or .so file, something else for a .a file.
330 Object(const std::string
& name
, Input_file
* input_file
, bool is_dynamic
,
332 : name_(name
), input_file_(input_file
), offset_(offset
), shnum_(-1U),
333 is_dynamic_(is_dynamic
), is_needed_(false), uses_split_stack_(false),
334 has_no_split_stack_(false), no_export_(false),
335 is_in_system_directory_(false), xindex_(NULL
)
337 if (input_file
!= NULL
)
339 input_file
->file().add_object();
340 this->is_in_system_directory_
= input_file
->is_in_system_directory();
346 if (this->input_file_
!= NULL
)
347 this->input_file_
->file().remove_object();
350 // Return the name of the object as we would report it to the tuser.
353 { return this->name_
; }
355 // Get the offset into the file.
358 { return this->offset_
; }
360 // Return whether this is a dynamic object.
363 { return this->is_dynamic_
; }
365 // Return whether this object is needed--true if it is a dynamic
366 // object which defines some symbol referenced by a regular object.
367 // We keep the flag here rather than in Dynobj for convenience when
371 { return this->is_needed_
; }
373 // Record that this object is needed.
376 { this->is_needed_
= true; }
378 // Return whether this object was compiled with -fsplit-stack.
380 uses_split_stack() const
381 { return this->uses_split_stack_
; }
383 // Return whether this object contains any functions compiled with
384 // the no_split_stack attribute.
386 has_no_split_stack() const
387 { return this->has_no_split_stack_
; }
389 // Returns NULL for Objects that are not plugin objects. This method
390 // is overridden in the Pluginobj class.
393 { return this->do_pluginobj(); }
395 // Get the file. We pass on const-ness.
399 gold_assert(this->input_file_
!= NULL
);
400 return this->input_file_
;
406 gold_assert(this->input_file_
!= NULL
);
407 return this->input_file_
;
410 // Lock the underlying file.
414 if (this->input_file_
!= NULL
)
415 this->input_file_
->file().lock(t
);
418 // Unlock the underlying file.
420 unlock(const Task
* t
)
422 if (this->input_file_
!= NULL
)
423 this->input_file()->file().unlock(t
);
426 // Return whether the underlying file is locked.
429 { return this->input_file_
!= NULL
&& this->input_file_
->file().is_locked(); }
431 // Return the token, so that the task can be queued.
435 if (this->input_file_
== NULL
)
437 return this->input_file()->file().token();
440 // Release the underlying file.
444 if (this->input_file_
!= NULL
)
445 this->input_file()->file().release();
448 // Return whether we should just read symbols from this file.
451 { return this->input_file()->just_symbols(); }
453 // Return whether this is an incremental object.
455 is_incremental() const
456 { return this->do_is_incremental(); }
458 // Return the last modified time of the file.
461 { return this->do_get_mtime(); }
463 // Get the number of sections.
466 { return this->shnum_
; }
468 // Return a view of the contents of a section. Set *PLEN to the
469 // size. CACHE is a hint as in File_read::get_view.
471 section_contents(unsigned int shndx
, section_size_type
* plen
, bool cache
);
473 // Adjust a symbol's section index as needed. SYMNDX is the index
474 // of the symbol and SHNDX is the symbol's section from
475 // get_st_shndx. This returns the section index. It sets
476 // *IS_ORDINARY to indicate whether this is a normal section index,
477 // rather than a special code between SHN_LORESERVE and
480 adjust_sym_shndx(unsigned int symndx
, unsigned int shndx
, bool* is_ordinary
)
482 if (shndx
< elfcpp::SHN_LORESERVE
)
484 else if (shndx
== elfcpp::SHN_XINDEX
)
486 if (this->xindex_
== NULL
)
487 this->xindex_
= this->do_initialize_xindex();
488 shndx
= this->xindex_
->sym_xindex_to_shndx(this, symndx
);
492 *is_ordinary
= false;
496 // Return the size of a section given a section index.
498 section_size(unsigned int shndx
)
499 { return this->do_section_size(shndx
); }
501 // Return the name of a section given a section index.
503 section_name(unsigned int shndx
)
504 { return this->do_section_name(shndx
); }
506 // Return the section flags given a section index.
508 section_flags(unsigned int shndx
)
509 { return this->do_section_flags(shndx
); }
511 // Return the section entsize given a section index.
513 section_entsize(unsigned int shndx
)
514 { return this->do_section_entsize(shndx
); }
516 // Return the section address given a section index.
518 section_address(unsigned int shndx
)
519 { return this->do_section_address(shndx
); }
521 // Return the section type given a section index.
523 section_type(unsigned int shndx
)
524 { return this->do_section_type(shndx
); }
526 // Return the section link field given a section index.
528 section_link(unsigned int shndx
)
529 { return this->do_section_link(shndx
); }
531 // Return the section info field given a section index.
533 section_info(unsigned int shndx
)
534 { return this->do_section_info(shndx
); }
536 // Return the required section alignment given a section index.
538 section_addralign(unsigned int shndx
)
539 { return this->do_section_addralign(shndx
); }
541 // Return the output section given a section index.
543 output_section(unsigned int shndx
) const
544 { return this->do_output_section(shndx
); }
546 // Given a section index, return the offset in the Output_section.
547 // The return value will be -1U if the section is specially mapped,
548 // such as a merge section.
550 output_section_offset(unsigned int shndx
) const
551 { return this->do_output_section_offset(shndx
); }
553 // Read the symbol information.
555 read_symbols(Read_symbols_data
* sd
)
556 { return this->do_read_symbols(sd
); }
558 // Pass sections which should be included in the link to the Layout
559 // object, and record where the sections go in the output file.
561 layout(Symbol_table
* symtab
, Layout
* layout
, Read_symbols_data
* sd
)
562 { this->do_layout(symtab
, layout
, sd
); }
564 // Add symbol information to the global symbol table.
566 add_symbols(Symbol_table
* symtab
, Read_symbols_data
* sd
, Layout
*layout
)
567 { this->do_add_symbols(symtab
, sd
, layout
); }
569 // Add symbol information to the global symbol table.
570 Archive::Should_include
571 should_include_member(Symbol_table
* symtab
, Layout
* layout
,
572 Read_symbols_data
* sd
, std::string
* why
)
573 { return this->do_should_include_member(symtab
, layout
, sd
, why
); }
575 // Iterate over global symbols, calling a visitor class V for each.
577 for_all_global_symbols(Read_symbols_data
* sd
,
578 Library_base::Symbol_visitor_base
* v
)
579 { return this->do_for_all_global_symbols(sd
, v
); }
581 // Iterate over local symbols, calling a visitor class V for each GOT offset
582 // associated with a local symbol.
584 for_all_local_got_entries(Got_offset_list::Visitor
* v
) const
585 { this->do_for_all_local_got_entries(v
); }
587 // Functions and types for the elfcpp::Elf_file interface. This
588 // permit us to use Object as the File template parameter for
591 // The View class is returned by view. It must support a single
592 // method, data(). This is trivial, because get_view does what we
597 View(const unsigned char* p
)
606 const unsigned char* p_
;
611 view(off_t file_offset
, section_size_type data_size
)
612 { return View(this->get_view(file_offset
, data_size
, true, true)); }
616 error(const char* format
, ...) const ATTRIBUTE_PRINTF_2
;
618 // A location in the file.
624 Location(off_t fo
, section_size_type ds
)
625 : file_offset(fo
), data_size(ds
)
629 // Get a View given a Location.
630 View
view(Location loc
)
631 { return View(this->get_view(loc
.file_offset
, loc
.data_size
, true, true)); }
633 // Get a view into the underlying file.
635 get_view(off_t start
, section_size_type size
, bool aligned
, bool cache
)
637 return this->input_file()->file().get_view(this->offset_
, start
, size
,
641 // Get a lasting view into the underlying file.
643 get_lasting_view(off_t start
, section_size_type size
, bool aligned
,
646 return this->input_file()->file().get_lasting_view(this->offset_
, start
,
647 size
, aligned
, cache
);
650 // Read data from the underlying file.
652 read(off_t start
, section_size_type size
, void* p
)
653 { this->input_file()->file().read(start
+ this->offset_
, size
, p
); }
655 // Read multiple data from the underlying file.
657 read_multiple(const File_read::Read_multiple
& rm
)
658 { this->input_file()->file().read_multiple(this->offset_
, rm
); }
660 // Stop caching views in the underlying file.
662 clear_view_cache_marks()
664 if (this->input_file_
!= NULL
)
665 this->input_file_
->file().clear_view_cache_marks();
668 // Get the number of global symbols defined by this object, and the
669 // number of the symbols whose final definition came from this
672 get_global_symbol_counts(const Symbol_table
* symtab
, size_t* defined
,
674 { this->do_get_global_symbol_counts(symtab
, defined
, used
); }
676 // Get the symbols defined in this object.
678 get_global_symbols() const
679 { return this->do_get_global_symbols(); }
681 // Set flag that this object was found in a system directory.
683 set_is_in_system_directory()
684 { this->is_in_system_directory_
= true; }
686 // Return whether this object was found in a system directory.
688 is_in_system_directory() const
689 { return this->is_in_system_directory_
; }
691 // Return whether we found this object by searching a directory.
694 { return this->input_file()->will_search_for(); }
698 { return this->no_export_
; }
701 set_no_export(bool value
)
702 { this->no_export_
= value
; }
704 // Return TRUE if the section is a compressed debug section, and set
705 // *UNCOMPRESSED_SIZE to the size of the uncompressed data.
707 section_is_compressed(unsigned int shndx
,
708 section_size_type
* uncompressed_size
) const
709 { return this->do_section_is_compressed(shndx
, uncompressed_size
); }
711 // Return the index of the first incremental relocation for symbol SYMNDX.
713 get_incremental_reloc_base(unsigned int symndx
) const
714 { return this->do_get_incremental_reloc_base(symndx
); }
716 // Return the number of incremental relocations for symbol SYMNDX.
718 get_incremental_reloc_count(unsigned int symndx
) const
719 { return this->do_get_incremental_reloc_count(symndx
); }
722 // Returns NULL for Objects that are not plugin objects. This method
723 // is overridden in the Pluginobj class.
728 // Return TRUE if this is an incremental (unchanged) input file.
729 // We return FALSE by default; the incremental object classes
730 // override this method.
732 do_is_incremental() const
735 // Return the last modified time of the file. This method may be
736 // overridden for subclasses that don't use an actual file (e.g.,
737 // Incremental objects).
740 { return this->input_file()->file().get_mtime(); }
742 // Read the symbols--implemented by child class.
744 do_read_symbols(Read_symbols_data
*) = 0;
746 // Lay out sections--implemented by child class.
748 do_layout(Symbol_table
*, Layout
*, Read_symbols_data
*) = 0;
750 // Add symbol information to the global symbol table--implemented by
753 do_add_symbols(Symbol_table
*, Read_symbols_data
*, Layout
*) = 0;
755 virtual Archive::Should_include
756 do_should_include_member(Symbol_table
* symtab
, Layout
*, Read_symbols_data
*,
757 std::string
* why
) = 0;
759 // Iterate over global symbols, calling a visitor class V for each.
761 do_for_all_global_symbols(Read_symbols_data
* sd
,
762 Library_base::Symbol_visitor_base
* v
) = 0;
764 // Iterate over local symbols, calling a visitor class V for each GOT offset
765 // associated with a local symbol.
767 do_for_all_local_got_entries(Got_offset_list::Visitor
* v
) const = 0;
769 // Return the location of the contents of a section. Implemented by
772 do_section_contents(unsigned int shndx
) = 0;
774 // Get the size of a section--implemented by child class.
776 do_section_size(unsigned int shndx
) = 0;
778 // Get the name of a section--implemented by child class.
780 do_section_name(unsigned int shndx
) = 0;
782 // Get section flags--implemented by child class.
784 do_section_flags(unsigned int shndx
) = 0;
786 // Get section entsize--implemented by child class.
788 do_section_entsize(unsigned int shndx
) = 0;
790 // Get section address--implemented by child class.
792 do_section_address(unsigned int shndx
) = 0;
794 // Get section type--implemented by child class.
796 do_section_type(unsigned int shndx
) = 0;
798 // Get section link field--implemented by child class.
800 do_section_link(unsigned int shndx
) = 0;
802 // Get section info field--implemented by child class.
804 do_section_info(unsigned int shndx
) = 0;
806 // Get section alignment--implemented by child class.
808 do_section_addralign(unsigned int shndx
) = 0;
810 // Return the output section given a section index--implemented
812 virtual Output_section
*
813 do_output_section(unsigned int) const
814 { gold_unreachable(); }
816 // Get the offset of a section--implemented by child class.
818 do_output_section_offset(unsigned int) const
819 { gold_unreachable(); }
821 // Return the Xindex structure to use.
823 do_initialize_xindex() = 0;
825 // Implement get_global_symbol_counts--implemented by child class.
827 do_get_global_symbol_counts(const Symbol_table
*, size_t*, size_t*) const = 0;
829 virtual const Symbols
*
830 do_get_global_symbols() const = 0;
832 // Set the number of sections.
835 { this->shnum_
= shnum
; }
837 // Functions used by both Sized_relobj and Sized_dynobj.
839 // Read the section data into a Read_symbols_data object.
840 template<int size
, bool big_endian
>
842 read_section_data(elfcpp::Elf_file
<size
, big_endian
, Object
>*,
845 // Let the child class initialize the xindex object directly.
847 set_xindex(Xindex
* xindex
)
849 gold_assert(this->xindex_
== NULL
);
850 this->xindex_
= xindex
;
853 // If NAME is the name of a special .gnu.warning section, arrange
854 // for the warning to be issued. SHNDX is the section index.
855 // Return whether it is a warning section.
857 handle_gnu_warning_section(const char* name
, unsigned int shndx
,
860 // If NAME is the name of the special section which indicates that
861 // this object was compiled with -fsplit-stack, mark it accordingly,
862 // and return true. Otherwise return false.
864 handle_split_stack_section(const char* name
);
866 // Return TRUE if the section is a compressed debug section, and set
867 // *UNCOMPRESSED_SIZE to the size of the uncompressed data.
869 do_section_is_compressed(unsigned int, section_size_type
*) const
872 // Return the index of the first incremental relocation for symbol SYMNDX--
873 // implemented by child class.
875 do_get_incremental_reloc_base(unsigned int) const
876 { gold_unreachable(); }
878 // Return the number of incremental relocations for symbol SYMNDX--
879 // implemented by child class.
881 do_get_incremental_reloc_count(unsigned int) const
882 { gold_unreachable(); }
885 // This class may not be copied.
886 Object(const Object
&);
887 Object
& operator=(const Object
&);
889 // Name of object as printed to user.
891 // For reading the file.
892 Input_file
* input_file_
;
893 // Offset within the file--0 for an object file, non-0 for an
896 // Number of input sections.
898 // Whether this is a dynamic object.
899 bool is_dynamic_
: 1;
900 // Whether this object is needed. This is only set for dynamic
901 // objects, and means that the object defined a symbol which was
902 // used by a reference from a regular object.
904 // Whether this object was compiled with -fsplit-stack.
905 bool uses_split_stack_
: 1;
906 // Whether this object contains any functions compiled with the
907 // no_split_stack attribute.
908 bool has_no_split_stack_
: 1;
909 // True if exclude this object from automatic symbol export.
910 // This is used only for archive objects.
912 // True if the object was found in a system directory.
913 bool is_in_system_directory_
: 1;
914 // Many sections for objects with more than SHN_LORESERVE sections.
918 // A regular object (ET_REL). This is an abstract base class itself.
919 // The implementation is the template class Sized_relobj.
921 class Relobj
: public Object
924 Relobj(const std::string
& name
, Input_file
* input_file
, off_t offset
= 0)
925 : Object(name
, input_file
, false, offset
),
927 map_to_relocatable_relocs_(NULL
),
928 object_merge_map_(NULL
),
929 relocs_must_follow_section_writes_(false),
935 // During garbage collection, the Read_symbols_data pass for
936 // each object is stored as layout needs to be done after
940 { return this->sd_
; }
942 // Decides which section names have to be included in the worklist
945 is_section_name_included(const char* name
);
948 copy_symbols_data(Symbols_data
* gc_sd
, Read_symbols_data
* sd
,
949 unsigned int section_header_size
);
952 set_symbols_data(Symbols_data
* sd
)
955 // During garbage collection, the Read_relocs pass for all objects
956 // is done before scanning the relocs. In that case, this->rd_ is
957 // used to store the information from Read_relocs for each object.
958 // This data is also used to compute the list of relevant sections.
961 { return this->rd_
; }
964 set_relocs_data(Read_relocs_data
* rd
)
968 is_output_section_offset_invalid(unsigned int shndx
) const = 0;
972 read_relocs(Read_relocs_data
* rd
)
973 { return this->do_read_relocs(rd
); }
975 // Process the relocs, during garbage collection only.
977 gc_process_relocs(Symbol_table
* symtab
, Layout
* layout
, Read_relocs_data
* rd
)
978 { return this->do_gc_process_relocs(symtab
, layout
, rd
); }
980 // Scan the relocs and adjust the symbol table.
982 scan_relocs(Symbol_table
* symtab
, Layout
* layout
, Read_relocs_data
* rd
)
983 { return this->do_scan_relocs(symtab
, layout
, rd
); }
985 // The number of local symbols in the input symbol table.
987 local_symbol_count() const
988 { return this->do_local_symbol_count(); }
990 // The number of local symbols in the output symbol table.
992 output_local_symbol_count() const
993 { return this->do_output_local_symbol_count(); }
995 // The file offset for local symbols in the output symbol table.
997 local_symbol_offset() const
998 { return this->do_local_symbol_offset(); }
1000 // Initial local symbol processing: count the number of local symbols
1001 // in the output symbol table and dynamic symbol table; add local symbol
1002 // names to *POOL and *DYNPOOL.
1004 count_local_symbols(Stringpool_template
<char>* pool
,
1005 Stringpool_template
<char>* dynpool
)
1006 { return this->do_count_local_symbols(pool
, dynpool
); }
1008 // Set the values of the local symbols, set the output symbol table
1009 // indexes for the local variables, and set the offset where local
1010 // symbol information will be stored. Returns the new local symbol index.
1012 finalize_local_symbols(unsigned int index
, off_t off
, Symbol_table
* symtab
)
1013 { return this->do_finalize_local_symbols(index
, off
, symtab
); }
1015 // Set the output dynamic symbol table indexes for the local variables.
1017 set_local_dynsym_indexes(unsigned int index
)
1018 { return this->do_set_local_dynsym_indexes(index
); }
1020 // Set the offset where local dynamic symbol information will be stored.
1022 set_local_dynsym_offset(off_t off
)
1023 { return this->do_set_local_dynsym_offset(off
); }
1025 // Relocate the input sections and write out the local symbols.
1027 relocate(const Symbol_table
* symtab
, const Layout
* layout
, Output_file
* of
)
1028 { return this->do_relocate(symtab
, layout
, of
); }
1030 // Return whether an input section is being included in the link.
1032 is_section_included(unsigned int shndx
) const
1034 gold_assert(shndx
< this->output_sections_
.size());
1035 return this->output_sections_
[shndx
] != NULL
;
1038 // The the output section of the input section with index SHNDX.
1039 // This is only used currently to remove a section from the link in
1042 set_output_section(unsigned int shndx
, Output_section
* os
)
1044 gold_assert(shndx
< this->output_sections_
.size());
1045 this->output_sections_
[shndx
] = os
;
1048 // Set the offset of an input section within its output section.
1050 set_section_offset(unsigned int shndx
, uint64_t off
)
1051 { this->do_set_section_offset(shndx
, off
); }
1053 // Return true if we need to wait for output sections to be written
1054 // before we can apply relocations. This is true if the object has
1055 // any relocations for sections which require special handling, such
1056 // as the exception frame section.
1058 relocs_must_follow_section_writes() const
1059 { return this->relocs_must_follow_section_writes_
; }
1061 // Return the object merge map.
1064 { return this->object_merge_map_
; }
1066 // Set the object merge map.
1068 set_merge_map(Object_merge_map
* object_merge_map
)
1070 gold_assert(this->object_merge_map_
== NULL
);
1071 this->object_merge_map_
= object_merge_map
;
1074 // Record the relocatable reloc info for an input reloc section.
1076 set_relocatable_relocs(unsigned int reloc_shndx
, Relocatable_relocs
* rr
)
1078 gold_assert(reloc_shndx
< this->shnum());
1079 (*this->map_to_relocatable_relocs_
)[reloc_shndx
] = rr
;
1082 // Get the relocatable reloc info for an input reloc section.
1084 relocatable_relocs(unsigned int reloc_shndx
)
1086 gold_assert(reloc_shndx
< this->shnum());
1087 return (*this->map_to_relocatable_relocs_
)[reloc_shndx
];
1090 // Layout sections whose layout was deferred while waiting for
1091 // input files from a plugin.
1093 layout_deferred_sections(Layout
* layout
)
1094 { this->do_layout_deferred_sections(layout
); }
1096 // Return the index of the first incremental relocation for symbol SYMNDX.
1097 virtual unsigned int
1098 do_get_incremental_reloc_base(unsigned int symndx
) const
1099 { return this->reloc_bases_
[symndx
]; }
1101 // Return the number of incremental relocations for symbol SYMNDX.
1102 virtual unsigned int
1103 do_get_incremental_reloc_count(unsigned int symndx
) const
1104 { return this->reloc_counts_
[symndx
]; }
1107 // The output section to be used for each input section, indexed by
1108 // the input section number. The output section is NULL if the
1109 // input section is to be discarded.
1110 typedef std::vector
<Output_section
*> Output_sections
;
1112 // Read the relocs--implemented by child class.
1114 do_read_relocs(Read_relocs_data
*) = 0;
1116 // Process the relocs--implemented by child class.
1118 do_gc_process_relocs(Symbol_table
*, Layout
*, Read_relocs_data
*) = 0;
1120 // Scan the relocs--implemented by child class.
1122 do_scan_relocs(Symbol_table
*, Layout
*, Read_relocs_data
*) = 0;
1124 // Return the number of local symbols--implemented by child class.
1125 virtual unsigned int
1126 do_local_symbol_count() const = 0;
1128 // Return the number of output local symbols--implemented by child class.
1129 virtual unsigned int
1130 do_output_local_symbol_count() const = 0;
1132 // Return the file offset for local symbols--implemented by child class.
1134 do_local_symbol_offset() const = 0;
1136 // Count local symbols--implemented by child class.
1138 do_count_local_symbols(Stringpool_template
<char>*,
1139 Stringpool_template
<char>*) = 0;
1141 // Finalize the local symbols. Set the output symbol table indexes
1142 // for the local variables, and set the offset where local symbol
1143 // information will be stored.
1144 virtual unsigned int
1145 do_finalize_local_symbols(unsigned int, off_t
, Symbol_table
*) = 0;
1147 // Set the output dynamic symbol table indexes for the local variables.
1148 virtual unsigned int
1149 do_set_local_dynsym_indexes(unsigned int) = 0;
1151 // Set the offset where local dynamic symbol information will be stored.
1152 virtual unsigned int
1153 do_set_local_dynsym_offset(off_t
) = 0;
1155 // Relocate the input sections and write out the local
1156 // symbols--implemented by child class.
1158 do_relocate(const Symbol_table
* symtab
, const Layout
*, Output_file
* of
) = 0;
1160 // Set the offset of a section--implemented by child class.
1162 do_set_section_offset(unsigned int shndx
, uint64_t off
) = 0;
1164 // Layout sections whose layout was deferred while waiting for
1165 // input files from a plugin--implemented by child class.
1167 do_layout_deferred_sections(Layout
*) = 0;
1169 // Given a section index, return the corresponding Output_section.
1170 // The return value will be NULL if the section is not included in
1173 do_output_section(unsigned int shndx
) const
1175 gold_assert(shndx
< this->output_sections_
.size());
1176 return this->output_sections_
[shndx
];
1179 // Return the vector mapping input sections to output sections.
1182 { return this->output_sections_
; }
1184 const Output_sections
&
1185 output_sections() const
1186 { return this->output_sections_
; }
1188 // Set the size of the relocatable relocs array.
1190 size_relocatable_relocs()
1192 this->map_to_relocatable_relocs_
=
1193 new std::vector
<Relocatable_relocs
*>(this->shnum());
1196 // Record that we must wait for the output sections to be written
1197 // before applying relocations.
1199 set_relocs_must_follow_section_writes()
1200 { this->relocs_must_follow_section_writes_
= true; }
1202 // Allocate the array for counting incremental relocations.
1204 allocate_incremental_reloc_counts()
1206 unsigned int nsyms
= this->do_get_global_symbols()->size();
1207 this->reloc_counts_
= new unsigned int[nsyms
];
1208 gold_assert(this->reloc_counts_
!= NULL
);
1209 memset(this->reloc_counts_
, 0, nsyms
* sizeof(unsigned int));
1212 // Record a relocation in this object referencing global symbol SYMNDX.
1213 // Used for tracking incremental link information.
1215 count_incremental_reloc(unsigned int symndx
)
1217 unsigned int nsyms
= this->do_get_global_symbols()->size();
1218 gold_assert(symndx
< nsyms
);
1219 gold_assert(this->reloc_counts_
!= NULL
);
1220 ++this->reloc_counts_
[symndx
];
1223 // Finalize the incremental relocation information.
1225 finalize_incremental_relocs(Layout
* layout
, bool clear_counts
);
1227 // Return the index of the next relocation to be written for global symbol
1228 // SYMNDX. Only valid after finalize_incremental_relocs() has been called.
1230 next_incremental_reloc_index(unsigned int symndx
)
1232 unsigned int nsyms
= this->do_get_global_symbols()->size();
1234 gold_assert(this->reloc_counts_
!= NULL
);
1235 gold_assert(this->reloc_bases_
!= NULL
);
1236 gold_assert(symndx
< nsyms
);
1238 unsigned int counter
= this->reloc_counts_
[symndx
]++;
1239 return this->reloc_bases_
[symndx
] + counter
;
1243 // Mapping from input sections to output section.
1244 Output_sections output_sections_
;
1245 // Mapping from input section index to the information recorded for
1246 // the relocations. This is only used for a relocatable link.
1247 std::vector
<Relocatable_relocs
*>* map_to_relocatable_relocs_
;
1248 // Mappings for merge sections. This is managed by the code in the
1250 Object_merge_map
* object_merge_map_
;
1251 // Whether we need to wait for output sections to be written before
1252 // we can apply relocations.
1253 bool relocs_must_follow_section_writes_
;
1254 // Used to store the relocs data computed by the Read_relocs pass.
1255 // Used during garbage collection of unused sections.
1256 Read_relocs_data
* rd_
;
1257 // Used to store the symbols data computed by the Read_symbols pass.
1258 // Again used during garbage collection when laying out referenced
1260 gold::Symbols_data
* sd_
;
1261 // Per-symbol counts of relocations, for incremental links.
1262 unsigned int* reloc_counts_
;
1263 // Per-symbol base indexes of relocations, for incremental links.
1264 unsigned int* reloc_bases_
;
1267 // This class is used to handle relocations against a section symbol
1268 // in an SHF_MERGE section. For such a symbol, we need to know the
1269 // addend of the relocation before we can determine the final value.
1270 // The addend gives us the location in the input section, and we can
1271 // determine how it is mapped to the output section. For a
1272 // non-section symbol, we apply the addend to the final value of the
1273 // symbol; that is done in finalize_local_symbols, and does not use
1277 class Merged_symbol_value
1280 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Value
;
1282 // We use a hash table to map offsets in the input section to output
1284 typedef Unordered_map
<section_offset_type
, Value
> Output_addresses
;
1286 Merged_symbol_value(Value input_value
, Value output_start_address
)
1287 : input_value_(input_value
), output_start_address_(output_start_address
),
1291 // Initialize the hash table.
1293 initialize_input_to_output_map(const Relobj
*, unsigned int input_shndx
);
1295 // Release the hash table to save space.
1297 free_input_to_output_map()
1298 { this->output_addresses_
.clear(); }
1300 // Get the output value corresponding to an addend. The object and
1301 // input section index are passed in because the caller will have
1302 // them; otherwise we could store them here.
1304 value(const Relobj
* object
, unsigned int input_shndx
, Value addend
) const
1306 // This is a relocation against a section symbol. ADDEND is the
1307 // offset in the section. The result should be the start of some
1308 // merge area. If the object file wants something else, it should
1309 // use a regular symbol rather than a section symbol.
1310 // Unfortunately, PR 6658 shows a case in which the object file
1311 // refers to the section symbol, but uses a negative ADDEND to
1312 // compensate for a PC relative reloc. We can't handle the
1313 // general case. However, we can handle the special case of a
1314 // negative addend, by assuming that it refers to the start of the
1315 // section. Of course, that means that we have to guess when
1316 // ADDEND is negative. It is normal to see a 32-bit value here
1317 // even when the template parameter size is 64, as 64-bit object
1318 // file formats have 32-bit relocations. We know this is a merge
1319 // section, so we know it has to fit into memory. So we assume
1320 // that we won't see a value larger than a large 32-bit unsigned
1321 // value. This will break objects with very very large merge
1322 // sections; they probably break in other ways anyhow.
1323 Value input_offset
= this->input_value_
;
1324 if (addend
< 0xffffff00)
1326 input_offset
+= addend
;
1329 typename
Output_addresses::const_iterator p
=
1330 this->output_addresses_
.find(input_offset
);
1331 if (p
!= this->output_addresses_
.end())
1332 return p
->second
+ addend
;
1334 return (this->value_from_output_section(object
, input_shndx
, input_offset
)
1339 // Get the output value for an input offset if we couldn't find it
1340 // in the hash table.
1342 value_from_output_section(const Relobj
*, unsigned int input_shndx
,
1343 Value input_offset
) const;
1345 // The value of the section symbol in the input file. This is
1346 // normally zero, but could in principle be something else.
1348 // The start address of this merged section in the output file.
1349 Value output_start_address_
;
1350 // A hash table which maps offsets in the input section to output
1351 // addresses. This only maps specific offsets, not all offsets.
1352 Output_addresses output_addresses_
;
1355 // This POD class is holds the value of a symbol. This is used for
1356 // local symbols, and for all symbols during relocation processing.
1357 // For special sections, such as SHF_MERGE sections, this calls a
1358 // function to get the final symbol value.
1364 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Value
;
1367 : output_symtab_index_(0), output_dynsym_index_(-1U), input_shndx_(0),
1368 is_ordinary_shndx_(false), is_section_symbol_(false),
1369 is_tls_symbol_(false), is_ifunc_symbol_(false), has_output_value_(true)
1370 { this->u_
.value
= 0; }
1374 if (!this->has_output_value_
)
1375 delete this->u_
.merged_symbol_value
;
1378 // Get the value of this symbol. OBJECT is the object in which this
1379 // symbol is defined, and ADDEND is an addend to add to the value.
1380 template<bool big_endian
>
1382 value(const Sized_relobj
<size
, big_endian
>* object
, Value addend
) const
1384 if (this->has_output_value_
)
1385 return this->u_
.value
+ addend
;
1388 gold_assert(this->is_ordinary_shndx_
);
1389 return this->u_
.merged_symbol_value
->value(object
, this->input_shndx_
,
1394 // Set the value of this symbol in the output symbol table.
1396 set_output_value(Value value
)
1397 { this->u_
.value
= value
; }
1399 // For a section symbol in a merged section, we need more
1402 set_merged_symbol_value(Merged_symbol_value
<size
>* msv
)
1404 gold_assert(this->is_section_symbol_
);
1405 this->has_output_value_
= false;
1406 this->u_
.merged_symbol_value
= msv
;
1409 // Initialize the input to output map for a section symbol in a
1410 // merged section. We also initialize the value of a non-section
1411 // symbol in a merged section.
1413 initialize_input_to_output_map(const Relobj
* object
)
1415 if (!this->has_output_value_
)
1417 gold_assert(this->is_section_symbol_
&& this->is_ordinary_shndx_
);
1418 Merged_symbol_value
<size
>* msv
= this->u_
.merged_symbol_value
;
1419 msv
->initialize_input_to_output_map(object
, this->input_shndx_
);
1423 // Free the input to output map for a section symbol in a merged
1426 free_input_to_output_map()
1428 if (!this->has_output_value_
)
1429 this->u_
.merged_symbol_value
->free_input_to_output_map();
1432 // Set the value of the symbol from the input file. This is only
1433 // called by count_local_symbols, to communicate the value to
1434 // finalize_local_symbols.
1436 set_input_value(Value value
)
1437 { this->u_
.value
= value
; }
1439 // Return the input value. This is only called by
1440 // finalize_local_symbols and (in special cases) relocate_section.
1443 { return this->u_
.value
; }
1445 // Return whether we have set the index in the output symbol table
1448 is_output_symtab_index_set() const
1450 return (this->output_symtab_index_
!= 0
1451 && this->output_symtab_index_
!= -2U);
1454 // Return whether this symbol may be discarded from the normal
1457 may_be_discarded_from_output_symtab() const
1459 gold_assert(!this->is_output_symtab_index_set());
1460 return this->output_symtab_index_
!= -2U;
1463 // Return whether this symbol has an entry in the output symbol
1466 has_output_symtab_entry() const
1468 gold_assert(this->is_output_symtab_index_set());
1469 return this->output_symtab_index_
!= -1U;
1472 // Return the index in the output symbol table.
1474 output_symtab_index() const
1476 gold_assert(this->is_output_symtab_index_set()
1477 && this->output_symtab_index_
!= -1U);
1478 return this->output_symtab_index_
;
1481 // Set the index in the output symbol table.
1483 set_output_symtab_index(unsigned int i
)
1485 gold_assert(!this->is_output_symtab_index_set());
1486 gold_assert(i
!= 0 && i
!= -1U && i
!= -2U);
1487 this->output_symtab_index_
= i
;
1490 // Record that this symbol should not go into the output symbol
1493 set_no_output_symtab_entry()
1495 gold_assert(this->output_symtab_index_
== 0);
1496 this->output_symtab_index_
= -1U;
1499 // Record that this symbol must go into the output symbol table,
1500 // because it there is a relocation that uses it.
1502 set_must_have_output_symtab_entry()
1504 gold_assert(!this->is_output_symtab_index_set());
1505 this->output_symtab_index_
= -2U;
1508 // Set the index in the output dynamic symbol table.
1510 set_needs_output_dynsym_entry()
1512 gold_assert(!this->is_section_symbol());
1513 this->output_dynsym_index_
= 0;
1516 // Return whether this symbol should go into the dynamic symbol
1519 needs_output_dynsym_entry() const
1521 return this->output_dynsym_index_
!= -1U;
1524 // Return whether this symbol has an entry in the dynamic symbol
1527 has_output_dynsym_entry() const
1529 gold_assert(this->output_dynsym_index_
!= 0);
1530 return this->output_dynsym_index_
!= -1U;
1533 // Record that this symbol should go into the dynamic symbol table.
1535 set_output_dynsym_index(unsigned int i
)
1537 gold_assert(this->output_dynsym_index_
== 0);
1538 gold_assert(i
!= 0 && i
!= -1U);
1539 this->output_dynsym_index_
= i
;
1542 // Return the index in the output dynamic symbol table.
1544 output_dynsym_index() const
1546 gold_assert(this->output_dynsym_index_
!= 0
1547 && this->output_dynsym_index_
!= -1U);
1548 return this->output_dynsym_index_
;
1551 // Set the index of the input section in the input file.
1553 set_input_shndx(unsigned int i
, bool is_ordinary
)
1555 this->input_shndx_
= i
;
1556 // input_shndx_ field is a bitfield, so make sure that the value
1558 gold_assert(this->input_shndx_
== i
);
1559 this->is_ordinary_shndx_
= is_ordinary
;
1562 // Return the index of the input section in the input file.
1564 input_shndx(bool* is_ordinary
) const
1566 *is_ordinary
= this->is_ordinary_shndx_
;
1567 return this->input_shndx_
;
1570 // Whether this is a section symbol.
1572 is_section_symbol() const
1573 { return this->is_section_symbol_
; }
1575 // Record that this is a section symbol.
1577 set_is_section_symbol()
1579 gold_assert(!this->needs_output_dynsym_entry());
1580 this->is_section_symbol_
= true;
1583 // Record that this is a TLS symbol.
1586 { this->is_tls_symbol_
= true; }
1588 // Return true if this is a TLS symbol.
1590 is_tls_symbol() const
1591 { return this->is_tls_symbol_
; }
1593 // Record that this is an IFUNC symbol.
1595 set_is_ifunc_symbol()
1596 { this->is_ifunc_symbol_
= true; }
1598 // Return true if this is an IFUNC symbol.
1600 is_ifunc_symbol() const
1601 { return this->is_ifunc_symbol_
; }
1603 // Return true if this has output value.
1605 has_output_value() const
1606 { return this->has_output_value_
; }
1609 // The index of this local symbol in the output symbol table. This
1610 // will be 0 if no value has been assigned yet, and the symbol may
1611 // be omitted. This will be -1U if the symbol should not go into
1612 // the symbol table. This will be -2U if the symbol must go into
1613 // the symbol table, but no index has been assigned yet.
1614 unsigned int output_symtab_index_
;
1615 // The index of this local symbol in the dynamic symbol table. This
1616 // will be -1U if the symbol should not go into the symbol table.
1617 unsigned int output_dynsym_index_
;
1618 // The section index in the input file in which this symbol is
1620 unsigned int input_shndx_
: 27;
1621 // Whether the section index is an ordinary index, not a special
1623 bool is_ordinary_shndx_
: 1;
1624 // Whether this is a STT_SECTION symbol.
1625 bool is_section_symbol_
: 1;
1626 // Whether this is a STT_TLS symbol.
1627 bool is_tls_symbol_
: 1;
1628 // Whether this is a STT_GNU_IFUNC symbol.
1629 bool is_ifunc_symbol_
: 1;
1630 // Whether this symbol has a value for the output file. This is
1631 // normally set to true during Layout::finalize, by
1632 // finalize_local_symbols. It will be false for a section symbol in
1633 // a merge section, as for such symbols we can not determine the
1634 // value to use in a relocation until we see the addend.
1635 bool has_output_value_
: 1;
1638 // This is used if has_output_value_ is true. Between
1639 // count_local_symbols and finalize_local_symbols, this is the
1640 // value in the input file. After finalize_local_symbols, it is
1641 // the value in the output file.
1643 // This is used if has_output_value_ is false. It points to the
1644 // information we need to get the value for a merge section.
1645 Merged_symbol_value
<size
>* merged_symbol_value
;
1649 // This type is used to modify relocations for -fsplit-stack. It is
1650 // indexed by relocation index, and means that the relocation at that
1651 // index should use the symbol from the vector, rather than the one
1652 // indicated by the relocation.
1654 class Reloc_symbol_changes
1657 Reloc_symbol_changes(size_t count
)
1662 set(size_t i
, Symbol
* sym
)
1663 { this->vec_
[i
] = sym
; }
1666 operator[](size_t i
) const
1667 { return this->vec_
[i
]; }
1670 std::vector
<Symbol
*> vec_
;
1673 // Type for mapping section index to uncompressed size.
1675 typedef std::map
<unsigned int, section_size_type
> Compressed_section_map
;
1677 // Abstract base class for a regular object file, either a real object file
1678 // or an incremental (unchanged) object. This is size and endian specific.
1680 template<int size
, bool big_endian
>
1681 class Sized_relobj_base
: public Relobj
1684 typedef Relobj::Symbols Symbols
;
1686 Sized_relobj_base(const std::string
& name
, Input_file
* input_file
)
1687 : Relobj(name
, input_file
)
1690 Sized_relobj_base(const std::string
& name
, Input_file
* input_file
,
1692 : Relobj(name
, input_file
, offset
)
1695 ~Sized_relobj_base()
1699 typedef Relobj::Output_sections Output_sections
;
1704 // A regular object file. This is size and endian specific.
1706 template<int size
, bool big_endian
>
1707 class Sized_relobj
: public Sized_relobj_base
<size
, big_endian
>
1710 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
1711 typedef typename Sized_relobj_base
<size
, big_endian
>::Symbols Symbols
;
1712 typedef std::vector
<Symbol_value
<size
> > Local_values
;
1714 static const Address invalid_address
= static_cast<Address
>(0) - 1;
1716 enum Compute_final_local_value_status
1720 // An error occurred.
1722 // The local symbol has no output section.
1726 Sized_relobj(const std::string
& name
, Input_file
* input_file
, off_t offset
,
1727 const typename
elfcpp::Ehdr
<size
, big_endian
>&);
1731 // Checks if the offset of input section SHNDX within its output
1732 // section is invalid.
1734 is_output_section_offset_invalid(unsigned int shndx
) const
1735 { return this->get_output_section_offset(shndx
) == invalid_address
; }
1737 // Set up the object file based on TARGET.
1740 { this->do_setup(); }
1742 // Return the number of symbols. This is only valid after
1743 // Object::add_symbols has been called.
1745 symbol_count() const
1746 { return this->local_symbol_count_
+ this->symbols_
.size(); }
1748 // If SYM is the index of a global symbol in the object file's
1749 // symbol table, return the Symbol object. Otherwise, return NULL.
1751 global_symbol(unsigned int sym
) const
1753 if (sym
>= this->local_symbol_count_
)
1755 gold_assert(sym
- this->local_symbol_count_
< this->symbols_
.size());
1756 return this->symbols_
[sym
- this->local_symbol_count_
];
1761 // Return the section index of symbol SYM. Set *VALUE to its value
1762 // in the object file. Set *IS_ORDINARY if this is an ordinary
1763 // section index, not a special code between SHN_LORESERVE and
1764 // SHN_HIRESERVE. Note that for a symbol which is not defined in
1765 // this object file, this will set *VALUE to 0 and return SHN_UNDEF;
1766 // it will not return the final value of the symbol in the link.
1768 symbol_section_and_value(unsigned int sym
, Address
* value
, bool* is_ordinary
);
1770 // Return a pointer to the Symbol_value structure which holds the
1771 // value of a local symbol.
1772 const Symbol_value
<size
>*
1773 local_symbol(unsigned int sym
) const
1775 gold_assert(sym
< this->local_values_
.size());
1776 return &this->local_values_
[sym
];
1779 // Return the index of local symbol SYM in the ordinary symbol
1780 // table. A value of -1U means that the symbol is not being output.
1782 symtab_index(unsigned int sym
) const
1784 gold_assert(sym
< this->local_values_
.size());
1785 return this->local_values_
[sym
].output_symtab_index();
1788 // Return the index of local symbol SYM in the dynamic symbol
1789 // table. A value of -1U means that the symbol is not being output.
1791 dynsym_index(unsigned int sym
) const
1793 gold_assert(sym
< this->local_values_
.size());
1794 return this->local_values_
[sym
].output_dynsym_index();
1797 // Return the input section index of local symbol SYM.
1799 local_symbol_input_shndx(unsigned int sym
, bool* is_ordinary
) const
1801 gold_assert(sym
< this->local_values_
.size());
1802 return this->local_values_
[sym
].input_shndx(is_ordinary
);
1805 // Record that local symbol SYM must be in the output symbol table.
1807 set_must_have_output_symtab_entry(unsigned int sym
)
1809 gold_assert(sym
< this->local_values_
.size());
1810 this->local_values_
[sym
].set_must_have_output_symtab_entry();
1813 // Record that local symbol SYM needs a dynamic symbol entry.
1815 set_needs_output_dynsym_entry(unsigned int sym
)
1817 gold_assert(sym
< this->local_values_
.size());
1818 this->local_values_
[sym
].set_needs_output_dynsym_entry();
1821 // Return whether the local symbol SYMNDX has a GOT offset.
1822 // For TLS symbols, the GOT entry will hold its tp-relative offset.
1824 local_has_got_offset(unsigned int symndx
, unsigned int got_type
) const
1826 Local_got_offsets::const_iterator p
=
1827 this->local_got_offsets_
.find(symndx
);
1828 return (p
!= this->local_got_offsets_
.end()
1829 && p
->second
->get_offset(got_type
) != -1U);
1832 // Return the GOT offset of the local symbol SYMNDX.
1834 local_got_offset(unsigned int symndx
, unsigned int got_type
) const
1836 Local_got_offsets::const_iterator p
=
1837 this->local_got_offsets_
.find(symndx
);
1838 gold_assert(p
!= this->local_got_offsets_
.end());
1839 unsigned int off
= p
->second
->get_offset(got_type
);
1840 gold_assert(off
!= -1U);
1844 // Set the GOT offset of the local symbol SYMNDX to GOT_OFFSET.
1846 set_local_got_offset(unsigned int symndx
, unsigned int got_type
,
1847 unsigned int got_offset
)
1849 Local_got_offsets::const_iterator p
=
1850 this->local_got_offsets_
.find(symndx
);
1851 if (p
!= this->local_got_offsets_
.end())
1852 p
->second
->set_offset(got_type
, got_offset
);
1855 Got_offset_list
* g
= new Got_offset_list(got_type
, got_offset
);
1856 std::pair
<Local_got_offsets::iterator
, bool> ins
=
1857 this->local_got_offsets_
.insert(std::make_pair(symndx
, g
));
1858 gold_assert(ins
.second
);
1862 // Return whether the local symbol SYMNDX has a PLT offset.
1864 local_has_plt_offset(unsigned int symndx
) const;
1866 // Return the PLT offset for a local symbol. It is an error to call
1867 // this if it doesn't have one.
1869 local_plt_offset(unsigned int symndx
) const;
1871 // Set the PLT offset of the local symbol SYMNDX.
1873 set_local_plt_offset(unsigned int symndx
, unsigned int plt_offset
);
1875 // Get the offset of input section SHNDX within its output section.
1876 // This is -1 if the input section requires a special mapping, such
1877 // as a merge section. The output section can be found in the
1878 // output_sections_ field of the parent class Relobj.
1880 get_output_section_offset(unsigned int shndx
) const
1882 gold_assert(shndx
< this->section_offsets_
.size());
1883 return this->section_offsets_
[shndx
];
1886 // Return the name of the symbol that spans the given offset in the
1887 // specified section in this object. This is used only for error
1888 // messages and is not particularly efficient.
1890 get_symbol_location_info(unsigned int shndx
, off_t offset
,
1891 Symbol_location_info
* info
);
1893 // Look for a kept section corresponding to the given discarded section,
1894 // and return its output address. This is used only for relocations in
1895 // debugging sections.
1897 map_to_kept_section(unsigned int shndx
, bool* found
) const;
1899 // Compute final local symbol value. R_SYM is the local symbol index.
1900 // LV_IN points to a local symbol value containing the input value.
1901 // LV_OUT points to a local symbol value storing the final output value,
1902 // which must not be a merged symbol value since before calling this
1903 // method to avoid memory leak. SYMTAB points to a symbol table.
1905 // The method returns a status code at return. If the return status is
1906 // CFLV_OK, *LV_OUT contains the final value. If the return status is
1907 // CFLV_ERROR, *LV_OUT is 0. If the return status is CFLV_DISCARDED,
1908 // *LV_OUT is not modified.
1909 Compute_final_local_value_status
1910 compute_final_local_value(unsigned int r_sym
,
1911 const Symbol_value
<size
>* lv_in
,
1912 Symbol_value
<size
>* lv_out
,
1913 const Symbol_table
* symtab
);
1916 typedef typename Sized_relobj_base
<size
, big_endian
>::Output_sections
1923 // Read the symbols.
1925 do_read_symbols(Read_symbols_data
*);
1927 // Return the number of local symbols.
1929 do_local_symbol_count() const
1930 { return this->local_symbol_count_
; }
1932 // Return the number of local symbols in the output symbol table.
1934 do_output_local_symbol_count() const
1935 { return this->output_local_symbol_count_
; }
1937 // Return the number of local symbols in the output symbol table.
1939 do_local_symbol_offset() const
1940 { return this->local_symbol_offset_
; }
1942 // Lay out the input sections.
1944 do_layout(Symbol_table
*, Layout
*, Read_symbols_data
*);
1946 // Layout sections whose layout was deferred while waiting for
1947 // input files from a plugin.
1949 do_layout_deferred_sections(Layout
*);
1951 // Add the symbols to the symbol table.
1953 do_add_symbols(Symbol_table
*, Read_symbols_data
*, Layout
*);
1955 Archive::Should_include
1956 do_should_include_member(Symbol_table
* symtab
, Layout
*, Read_symbols_data
*,
1959 // Iterate over global symbols, calling a visitor class V for each.
1961 do_for_all_global_symbols(Read_symbols_data
* sd
,
1962 Library_base::Symbol_visitor_base
* v
);
1964 // Iterate over local symbols, calling a visitor class V for each GOT offset
1965 // associated with a local symbol.
1967 do_for_all_local_got_entries(Got_offset_list::Visitor
* v
) const;
1971 do_read_relocs(Read_relocs_data
*);
1973 // Process the relocs to find list of referenced sections. Used only
1974 // during garbage collection.
1976 do_gc_process_relocs(Symbol_table
*, Layout
*, Read_relocs_data
*);
1978 // Scan the relocs and adjust the symbol table.
1980 do_scan_relocs(Symbol_table
*, Layout
*, Read_relocs_data
*);
1982 // Count the local symbols.
1984 do_count_local_symbols(Stringpool_template
<char>*,
1985 Stringpool_template
<char>*);
1987 // Finalize the local symbols.
1989 do_finalize_local_symbols(unsigned int, off_t
, Symbol_table
*);
1991 // Set the offset where local dynamic symbol information will be stored.
1993 do_set_local_dynsym_indexes(unsigned int);
1995 // Set the offset where local dynamic symbol information will be stored.
1997 do_set_local_dynsym_offset(off_t
);
1999 // Relocate the input sections and write out the local symbols.
2001 do_relocate(const Symbol_table
* symtab
, const Layout
*, Output_file
* of
);
2003 // Get the size of a section.
2005 do_section_size(unsigned int shndx
)
2006 { return this->elf_file_
.section_size(shndx
); }
2008 // Get the name of a section.
2010 do_section_name(unsigned int shndx
)
2011 { return this->elf_file_
.section_name(shndx
); }
2013 // Return the location of the contents of a section.
2015 do_section_contents(unsigned int shndx
)
2016 { return this->elf_file_
.section_contents(shndx
); }
2018 // Return section flags.
2020 do_section_flags(unsigned int shndx
);
2022 // Return section entsize.
2024 do_section_entsize(unsigned int shndx
);
2026 // Return section address.
2028 do_section_address(unsigned int shndx
)
2029 { return this->elf_file_
.section_addr(shndx
); }
2031 // Return section type.
2033 do_section_type(unsigned int shndx
)
2034 { return this->elf_file_
.section_type(shndx
); }
2036 // Return the section link field.
2038 do_section_link(unsigned int shndx
)
2039 { return this->elf_file_
.section_link(shndx
); }
2041 // Return the section info field.
2043 do_section_info(unsigned int shndx
)
2044 { return this->elf_file_
.section_info(shndx
); }
2046 // Return the section alignment.
2048 do_section_addralign(unsigned int shndx
)
2049 { return this->elf_file_
.section_addralign(shndx
); }
2051 // Return the Xindex structure to use.
2053 do_initialize_xindex();
2055 // Get symbol counts.
2057 do_get_global_symbol_counts(const Symbol_table
*, size_t*, size_t*) const;
2059 // Get the global symbols.
2061 do_get_global_symbols() const
2062 { return &this->symbols_
; }
2064 // Get the offset of a section.
2066 do_output_section_offset(unsigned int shndx
) const
2068 Address off
= this->get_output_section_offset(shndx
);
2069 if (off
== invalid_address
)
2074 // Set the offset of a section.
2076 do_set_section_offset(unsigned int shndx
, uint64_t off
)
2078 gold_assert(shndx
< this->section_offsets_
.size());
2079 this->section_offsets_
[shndx
] =
2080 (off
== static_cast<uint64_t>(-1)
2082 : convert_types
<Address
, uint64_t>(off
));
2085 // Adjust a section index if necessary.
2087 adjust_shndx(unsigned int shndx
)
2089 if (shndx
>= elfcpp::SHN_LORESERVE
)
2090 shndx
+= this->elf_file_
.large_shndx_offset();
2094 // Initialize input to output maps for section symbols in merged
2097 initialize_input_to_output_maps();
2099 // Free the input to output maps for section symbols in merged
2102 free_input_to_output_maps();
2104 // Return symbol table section index.
2106 symtab_shndx() const
2107 { return this->symtab_shndx_
; }
2109 // Allow a child class to access the ELF file.
2110 elfcpp::Elf_file
<size
, big_endian
, Object
>*
2112 { return &this->elf_file_
; }
2114 // Allow a child class to access the local values.
2117 { return &this->local_values_
; }
2119 // Views and sizes when relocating.
2122 unsigned char* view
;
2123 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
;
2125 section_size_type view_size
;
2126 bool is_input_output_view
;
2127 bool is_postprocessing_view
;
2130 typedef std::vector
<View_size
> Views
;
2132 // This may be overriden by a child class.
2134 do_relocate_sections(const Symbol_table
* symtab
, const Layout
* layout
,
2135 const unsigned char* pshdrs
, Output_file
* of
,
2138 // Allow a child to set output local symbol count.
2140 set_output_local_symbol_count(unsigned int value
)
2141 { this->output_local_symbol_count_
= value
; }
2143 // Return TRUE if the section is a compressed debug section, and set
2144 // *UNCOMPRESSED_SIZE to the size of the uncompressed data.
2146 do_section_is_compressed(unsigned int shndx
,
2147 section_size_type
* uncompressed_size
) const
2149 if (this->compressed_sections_
== NULL
)
2151 Compressed_section_map::const_iterator p
=
2152 this->compressed_sections_
->find(shndx
);
2153 if (p
!= this->compressed_sections_
->end())
2155 if (uncompressed_size
!= NULL
)
2156 *uncompressed_size
= p
->second
;
2164 typedef Sized_relobj
<size
, big_endian
> This
;
2165 static const int ehdr_size
= elfcpp::Elf_sizes
<size
>::ehdr_size
;
2166 static const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
2167 static const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
2168 typedef elfcpp::Shdr
<size
, big_endian
> Shdr
;
2170 // To keep track of discarded comdat sections, we need to map a member
2171 // section index to the object and section index of the corresponding
2173 struct Kept_comdat_section
2175 Kept_comdat_section(Relobj
* a_object
, unsigned int a_shndx
)
2176 : object(a_object
), shndx(a_shndx
)
2181 typedef std::map
<unsigned int, Kept_comdat_section
>
2182 Kept_comdat_section_table
;
2184 // Find the SHT_SYMTAB section, given the section headers.
2186 find_symtab(const unsigned char* pshdrs
);
2188 // Return whether SHDR has the right flags for a GNU style exception
2191 check_eh_frame_flags(const elfcpp::Shdr
<size
, big_endian
>* shdr
) const;
2193 // Return whether there is a section named .eh_frame which might be
2194 // a GNU style exception frame section.
2196 find_eh_frame(const unsigned char* pshdrs
, const char* names
,
2197 section_size_type names_size
) const;
2199 // Whether to include a section group in the link.
2201 include_section_group(Symbol_table
*, Layout
*, unsigned int, const char*,
2202 const unsigned char*, const char*, section_size_type
,
2203 std::vector
<bool>*);
2205 // Whether to include a linkonce section in the link.
2207 include_linkonce_section(Layout
*, unsigned int, const char*,
2208 const elfcpp::Shdr
<size
, big_endian
>&);
2210 // Layout an input section.
2212 layout_section(Layout
* layout
, unsigned int shndx
, const char* name
,
2213 typename
This::Shdr
& shdr
, unsigned int reloc_shndx
,
2214 unsigned int reloc_type
);
2216 // Write section data to the output file. Record the views and
2217 // sizes in VIEWS for use when relocating.
2219 write_sections(const unsigned char* pshdrs
, Output_file
*, Views
*);
2221 // Relocate the sections in the output file.
2223 relocate_sections(const Symbol_table
* symtab
, const Layout
* layout
,
2224 const unsigned char* pshdrs
, Output_file
* of
,
2226 { this->do_relocate_sections(symtab
, layout
, pshdrs
, of
, pviews
); }
2228 // Scan the input relocations for --emit-relocs.
2230 emit_relocs_scan(Symbol_table
*, Layout
*, const unsigned char* plocal_syms
,
2231 const Read_relocs_data::Relocs_list::iterator
&);
2233 // Scan the input relocations for --emit-relocs, templatized on the
2234 // type of the relocation section.
2235 template<int sh_type
>
2237 emit_relocs_scan_reltype(Symbol_table
*, Layout
*,
2238 const unsigned char* plocal_syms
,
2239 const Read_relocs_data::Relocs_list::iterator
&,
2240 Relocatable_relocs
*);
2242 // Emit the relocs for --emit-relocs.
2244 emit_relocs(const Relocate_info
<size
, big_endian
>*, unsigned int,
2245 unsigned int sh_type
, const unsigned char* prelocs
,
2246 size_t reloc_count
, Output_section
*, Address output_offset
,
2247 unsigned char* view
, Address address
,
2248 section_size_type view_size
,
2249 unsigned char* reloc_view
, section_size_type reloc_view_size
);
2251 // Emit the relocs for --emit-relocs, templatized on the type of the
2252 // relocation section.
2253 template<int sh_type
>
2255 emit_relocs_reltype(const Relocate_info
<size
, big_endian
>*, unsigned int,
2256 const unsigned char* prelocs
, size_t reloc_count
,
2257 Output_section
*, Address output_offset
,
2258 unsigned char* view
, Address address
,
2259 section_size_type view_size
,
2260 unsigned char* reloc_view
,
2261 section_size_type reloc_view_size
);
2263 // Scan the input relocations for --incremental.
2265 incremental_relocs_scan(const Read_relocs_data::Relocs_list::iterator
&);
2267 // Scan the input relocations for --incremental, templatized on the
2268 // type of the relocation section.
2269 template<int sh_type
>
2271 incremental_relocs_scan_reltype(
2272 const Read_relocs_data::Relocs_list::iterator
&);
2275 incremental_relocs_write(const Relocate_info
<size
, big_endian
>*,
2276 unsigned int sh_type
,
2277 const unsigned char* prelocs
,
2280 Address output_offset
,
2283 template<int sh_type
>
2285 incremental_relocs_write_reltype(const Relocate_info
<size
, big_endian
>*,
2286 const unsigned char* prelocs
,
2289 Address output_offset
,
2292 // A type shared by split_stack_adjust_reltype and find_functions.
2293 typedef std::map
<section_offset_type
, section_size_type
> Function_offsets
;
2295 // Check for -fsplit-stack routines calling non-split-stack routines.
2297 split_stack_adjust(const Symbol_table
*, const unsigned char* pshdrs
,
2298 unsigned int sh_type
, unsigned int shndx
,
2299 const unsigned char* prelocs
, size_t reloc_count
,
2300 unsigned char* view
, section_size_type view_size
,
2301 Reloc_symbol_changes
** reloc_map
);
2303 template<int sh_type
>
2305 split_stack_adjust_reltype(const Symbol_table
*, const unsigned char* pshdrs
,
2306 unsigned int shndx
, const unsigned char* prelocs
,
2307 size_t reloc_count
, unsigned char* view
,
2308 section_size_type view_size
,
2309 Reloc_symbol_changes
** reloc_map
);
2311 // Find all functions in a section.
2313 find_functions(const unsigned char* pshdrs
, unsigned int shndx
,
2316 // Write out the local symbols.
2318 write_local_symbols(Output_file
*,
2319 const Stringpool_template
<char>*,
2320 const Stringpool_template
<char>*,
2321 Output_symtab_xindex
*,
2322 Output_symtab_xindex
*,
2325 // Record a mapping from discarded section SHNDX to the corresponding
2328 set_kept_comdat_section(unsigned int shndx
, Relobj
* kept_object
,
2329 unsigned int kept_shndx
)
2331 Kept_comdat_section
kept(kept_object
, kept_shndx
);
2332 this->kept_comdat_sections_
.insert(std::make_pair(shndx
, kept
));
2335 // Find the kept section corresponding to the discarded section
2336 // SHNDX. Return true if found.
2338 get_kept_comdat_section(unsigned int shndx
, Relobj
** kept_object
,
2339 unsigned int* kept_shndx
) const
2341 typename
Kept_comdat_section_table::const_iterator p
=
2342 this->kept_comdat_sections_
.find(shndx
);
2343 if (p
== this->kept_comdat_sections_
.end())
2345 *kept_object
= p
->second
.object
;
2346 *kept_shndx
= p
->second
.shndx
;
2350 // Compute final local symbol value. R_SYM is the local symbol index.
2351 // LV_IN points to a local symbol value containing the input value.
2352 // LV_OUT points to a local symbol value storing the final output value,
2353 // which must not be a merged symbol value since before calling this
2354 // method to avoid memory leak. RELOCATABLE indicates whether we are
2355 // linking a relocatable output. OUT_SECTIONS is an array of output
2356 // sections. OUT_OFFSETS is an array of offsets of the sections. SYMTAB
2357 // points to a symbol table.
2359 // The method returns a status code at return. If the return status is
2360 // CFLV_OK, *LV_OUT contains the final value. If the return status is
2361 // CFLV_ERROR, *LV_OUT is 0. If the return status is CFLV_DISCARDED,
2362 // *LV_OUT is not modified.
2363 inline Compute_final_local_value_status
2364 compute_final_local_value_internal(unsigned int r_sym
,
2365 const Symbol_value
<size
>* lv_in
,
2366 Symbol_value
<size
>* lv_out
,
2368 const Output_sections
& out_sections
,
2369 const std::vector
<Address
>& out_offsets
,
2370 const Symbol_table
* symtab
);
2372 // The GOT offsets of local symbols. This map also stores GOT offsets
2373 // for tp-relative offsets for TLS symbols.
2374 typedef Unordered_map
<unsigned int, Got_offset_list
*> Local_got_offsets
;
2376 // The PLT offsets of local symbols.
2377 typedef Unordered_map
<unsigned int, unsigned int> Local_plt_offsets
;
2379 // Saved information for sections whose layout was deferred.
2380 struct Deferred_layout
2382 static const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
2383 Deferred_layout(unsigned int shndx
, const char* name
,
2384 const unsigned char* pshdr
,
2385 unsigned int reloc_shndx
, unsigned int reloc_type
)
2386 : shndx_(shndx
), name_(name
), reloc_shndx_(reloc_shndx
),
2387 reloc_type_(reloc_type
)
2389 memcpy(this->shdr_data_
, pshdr
, shdr_size
);
2391 unsigned int shndx_
;
2393 unsigned int reloc_shndx_
;
2394 unsigned int reloc_type_
;
2395 unsigned char shdr_data_
[shdr_size
];
2398 // General access to the ELF file.
2399 elfcpp::Elf_file
<size
, big_endian
, Object
> elf_file_
;
2400 // Index of SHT_SYMTAB section.
2401 unsigned int symtab_shndx_
;
2402 // The number of local symbols.
2403 unsigned int local_symbol_count_
;
2404 // The number of local symbols which go into the output file.
2405 unsigned int output_local_symbol_count_
;
2406 // The number of local symbols which go into the output file's dynamic
2408 unsigned int output_local_dynsym_count_
;
2409 // The entries in the symbol table for the external symbols.
2411 // Number of symbols defined in object file itself.
2412 size_t defined_count_
;
2413 // File offset for local symbols (relative to start of symbol table).
2414 off_t local_symbol_offset_
;
2415 // File offset for local dynamic symbols (absolute).
2416 off_t local_dynsym_offset_
;
2417 // Values of local symbols.
2418 Local_values local_values_
;
2419 // GOT offsets for local non-TLS symbols, and tp-relative offsets
2420 // for TLS symbols, indexed by symbol number.
2421 Local_got_offsets local_got_offsets_
;
2422 // PLT offsets for local symbols.
2423 Local_plt_offsets local_plt_offsets_
;
2424 // For each input section, the offset of the input section in its
2425 // output section. This is INVALID_ADDRESS if the input section requires a
2427 std::vector
<Address
> section_offsets_
;
2428 // Table mapping discarded comdat sections to corresponding kept sections.
2429 Kept_comdat_section_table kept_comdat_sections_
;
2430 // Whether this object has a GNU style .eh_frame section.
2432 // If this object has a GNU style .eh_frame section that is discarded in
2433 // output, record the index here. Otherwise it is -1U.
2434 unsigned int discarded_eh_frame_shndx_
;
2435 // The list of sections whose layout was deferred.
2436 std::vector
<Deferred_layout
> deferred_layout_
;
2437 // The list of relocation sections whose layout was deferred.
2438 std::vector
<Deferred_layout
> deferred_layout_relocs_
;
2439 // For compressed debug sections, map section index to uncompressed size.
2440 Compressed_section_map
* compressed_sections_
;
2443 // A class to manage the list of all objects.
2449 : relobj_list_(), dynobj_list_(), sonames_(), cref_(NULL
)
2452 // The type of the list of input relocateable objects.
2453 typedef std::vector
<Relobj
*> Relobj_list
;
2454 typedef Relobj_list::const_iterator Relobj_iterator
;
2456 // The type of the list of input dynamic objects.
2457 typedef std::vector
<Dynobj
*> Dynobj_list
;
2458 typedef Dynobj_list::const_iterator Dynobj_iterator
;
2460 // Add an object to the list. Return true if all is well, or false
2461 // if this object should be ignored.
2463 add_object(Object
*);
2465 // Start processing an archive.
2467 archive_start(Archive
*);
2469 // Stop processing an archive.
2471 archive_stop(Archive
*);
2473 // For each dynamic object, check whether we've seen all of its
2474 // explicit dependencies.
2476 check_dynamic_dependencies() const;
2478 // Return whether an object was found in the system library
2481 found_in_system_library_directory(const Object
*) const;
2483 // Print symbol counts.
2485 print_symbol_counts(const Symbol_table
*) const;
2487 // Print a cross reference table.
2489 print_cref(const Symbol_table
*, FILE*) const;
2491 // Iterate over all regular objects.
2494 relobj_begin() const
2495 { return this->relobj_list_
.begin(); }
2499 { return this->relobj_list_
.end(); }
2501 // Iterate over all dynamic objects.
2504 dynobj_begin() const
2505 { return this->dynobj_list_
.begin(); }
2509 { return this->dynobj_list_
.end(); }
2511 // Return whether we have seen any dynamic objects.
2514 { return !this->dynobj_list_
.empty(); }
2516 // Return the number of non dynamic objects.
2518 number_of_relobjs() const
2519 { return this->relobj_list_
.size(); }
2521 // Return the number of input objects.
2523 number_of_input_objects() const
2524 { return this->relobj_list_
.size() + this->dynobj_list_
.size(); }
2527 Input_objects(const Input_objects
&);
2528 Input_objects
& operator=(const Input_objects
&);
2530 // The list of ordinary objects included in the link.
2531 Relobj_list relobj_list_
;
2532 // The list of dynamic objects included in the link.
2533 Dynobj_list dynobj_list_
;
2534 // SONAMEs that we have seen.
2535 Unordered_set
<std::string
> sonames_
;
2536 // Manage cross-references if requested.
2540 // Some of the information we pass to the relocation routines. We
2541 // group this together to avoid passing a dozen different arguments.
2543 template<int size
, bool big_endian
>
2544 struct Relocate_info
2547 const Symbol_table
* symtab
;
2549 const Layout
* layout
;
2550 // Object being relocated.
2551 Sized_relobj
<size
, big_endian
>* object
;
2552 // Section index of relocation section.
2553 unsigned int reloc_shndx
;
2554 // Section header of relocation section.
2555 const unsigned char* reloc_shdr
;
2556 // Section index of section being relocated.
2557 unsigned int data_shndx
;
2558 // Section header of data section.
2559 const unsigned char* data_shdr
;
2561 // Return a string showing the location of a relocation. This is
2562 // only used for error messages.
2564 location(size_t relnum
, off_t reloffset
) const;
2567 // This is used to represent a section in an object and is used as the
2568 // key type for various section maps.
2569 typedef std::pair
<Object
*, unsigned int> Section_id
;
2571 // This is similar to Section_id but is used when the section
2572 // pointers are const.
2573 typedef std::pair
<const Object
*, unsigned int> Const_section_id
;
2575 // The hash value is based on the address of an object in memory during
2576 // linking. It is okay to use this for looking up sections but never use
2577 // this in an unordered container that we want to traverse in a repeatable
2580 struct Section_id_hash
2582 size_t operator()(const Section_id
& loc
) const
2583 { return reinterpret_cast<uintptr_t>(loc
.first
) ^ loc
.second
; }
2586 struct Const_section_id_hash
2588 size_t operator()(const Const_section_id
& loc
) const
2589 { return reinterpret_cast<uintptr_t>(loc
.first
) ^ loc
.second
; }
2592 // Return whether INPUT_FILE contains an ELF object start at file
2593 // offset OFFSET. This sets *START to point to a view of the start of
2594 // the file. It sets *READ_SIZE to the number of bytes in the view.
2597 is_elf_object(Input_file
* input_file
, off_t offset
,
2598 const unsigned char** start
, int* read_size
);
2600 // Return an Object appropriate for the input file. P is BYTES long,
2601 // and holds the ELF header. If PUNCONFIGURED is not NULL, then if
2602 // this sees an object the linker is not configured to support, it
2603 // sets *PUNCONFIGURED to true and returns NULL without giving an
2607 make_elf_object(const std::string
& name
, Input_file
*,
2608 off_t offset
, const unsigned char* p
,
2609 section_offset_type bytes
, bool* punconfigured
);
2611 } // end namespace gold
2613 #endif // !defined(GOLD_OBJECT_H)