1 // object.h -- support for an object file for linking in gold -*- C++ -*-
3 // Copyright 2006, 2007, 2008 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"
37 class General_options
;
44 class Output_symtab_xindex
;
47 class Object_merge_map
;
48 class Relocatable_relocs
;
50 template<typename Stringpool_char
>
51 class Stringpool_template
;
53 // Data to pass from read_symbols() to add_symbols().
55 struct Read_symbols_data
58 File_view
* section_headers
;
60 File_view
* section_names
;
61 // Size of section name data in bytes.
62 section_size_type section_names_size
;
65 // Size of symbol data in bytes.
66 section_size_type symbols_size
;
67 // Offset of external symbols within symbol data. This structure
68 // sometimes contains only external symbols, in which case this will
69 // be zero. Sometimes it contains all symbols.
70 section_offset_type external_symbols_offset
;
72 File_view
* symbol_names
;
73 // Size of symbol name data in bytes.
74 section_size_type symbol_names_size
;
76 // Version information. This is only used on dynamic objects.
77 // Version symbol data (from SHT_GNU_versym section).
79 section_size_type versym_size
;
80 // Version definition data (from SHT_GNU_verdef section).
82 section_size_type verdef_size
;
83 unsigned int verdef_info
;
84 // Needed version data (from SHT_GNU_verneed section).
86 section_size_type verneed_size
;
87 unsigned int verneed_info
;
90 // Information used to print error messages.
92 struct Symbol_location_info
94 std::string source_file
;
95 std::string enclosing_symbol_name
;
99 // Data about a single relocation section. This is read in
100 // read_relocs and processed in scan_relocs.
102 struct Section_relocs
104 // Index of reloc section.
105 unsigned int reloc_shndx
;
106 // Index of section that relocs apply to.
107 unsigned int data_shndx
;
108 // Contents of reloc section.
110 // Reloc section type.
111 unsigned int sh_type
;
112 // Number of reloc entries.
115 Output_section
* output_section
;
116 // Whether this section has special handling for offsets.
117 bool needs_special_offset_handling
;
118 // Whether the data section is allocated (has the SHF_ALLOC flag set).
119 bool is_data_section_allocated
;
122 // Relocations in an object file. This is read in read_relocs and
123 // processed in scan_relocs.
125 struct Read_relocs_data
127 typedef std::vector
<Section_relocs
> Relocs_list
;
130 // The local symbols.
131 File_view
* local_symbols
;
134 // The Xindex class manages section indexes for objects with more than
140 Xindex(int large_shndx_offset
)
141 : large_shndx_offset_(large_shndx_offset
), symtab_xindex_()
144 // Initialize the symtab_xindex_ array, given the object and the
145 // section index of the symbol table to use.
146 template<int size
, bool big_endian
>
148 initialize_symtab_xindex(Object
*, unsigned int symtab_shndx
);
150 // Read in the symtab_xindex_ array, given its section index.
151 // PSHDRS may optionally point to the section headers.
152 template<int size
, bool big_endian
>
154 read_symtab_xindex(Object
*, unsigned int xindex_shndx
,
155 const unsigned char* pshdrs
);
157 // Symbol SYMNDX in OBJECT has a section of SHN_XINDEX; return the
158 // real section index.
160 sym_xindex_to_shndx(Object
* object
, unsigned int symndx
);
163 // The type of the array giving the real section index for symbols
164 // whose st_shndx field holds SHN_XINDEX.
165 typedef std::vector
<unsigned int> Symtab_xindex
;
167 // Adjust a section index if necessary. This should only be called
168 // for ordinary section indexes.
170 adjust_shndx(unsigned int shndx
)
172 if (shndx
>= elfcpp::SHN_LORESERVE
)
173 shndx
+= this->large_shndx_offset_
;
177 // Adjust to apply to large section indexes.
178 int large_shndx_offset_
;
179 // The data from the SHT_SYMTAB_SHNDX section.
180 Symtab_xindex symtab_xindex_
;
183 // Object is an abstract base class which represents either a 32-bit
184 // or a 64-bit input object. This can be a regular object file
185 // (ET_REL) or a shared object (ET_DYN).
190 // NAME is the name of the object as we would report it to the user
191 // (e.g., libfoo.a(bar.o) if this is in an archive. INPUT_FILE is
192 // used to read the file. OFFSET is the offset within the input
193 // file--0 for a .o or .so file, something else for a .a file.
194 Object(const std::string
& name
, Input_file
* input_file
, bool is_dynamic
,
196 : name_(name
), input_file_(input_file
), offset_(offset
), shnum_(-1U),
197 is_dynamic_(is_dynamic
), target_(NULL
), xindex_(NULL
)
198 { input_file
->file().add_object(); }
201 { this->input_file_
->file().remove_object(); }
203 // Return the name of the object as we would report it to the tuser.
206 { return this->name_
; }
208 // Get the offset into the file.
211 { return this->offset_
; }
213 // Return whether this is a dynamic object.
216 { return this->is_dynamic_
; }
218 // Returns NULL for Objects that are not plugin objects. This method
219 // is overridden in the Pluginobj class.
222 { return this->do_pluginobj(); }
224 // Return the target structure associated with this object.
227 { return this->target_
; }
229 // Lock the underlying file.
232 { this->input_file()->file().lock(t
); }
234 // Unlock the underlying file.
236 unlock(const Task
* t
)
237 { this->input_file()->file().unlock(t
); }
239 // Return whether the underlying file is locked.
242 { return this->input_file()->file().is_locked(); }
244 // Return the token, so that the task can be queued.
247 { return this->input_file()->file().token(); }
249 // Release the underlying file.
252 { this->input_file_
->file().release(); }
254 // Return whether we should just read symbols from this file.
257 { return this->input_file()->just_symbols(); }
259 // Return the sized target structure associated with this object.
260 // This is like the target method but it returns a pointer of
261 // appropriate checked type.
262 template<int size
, bool big_endian
>
263 Sized_target
<size
, big_endian
>*
264 sized_target() const;
266 // Get the number of sections.
269 { return this->shnum_
; }
271 // Return a view of the contents of a section. Set *PLEN to the
272 // size. CACHE is a hint as in File_read::get_view.
274 section_contents(unsigned int shndx
, section_size_type
* plen
, bool cache
);
276 // Adjust a symbol's section index as needed. SYMNDX is the index
277 // of the symbol and SHNDX is the symbol's section from
278 // get_st_shndx. This returns the section index. It sets
279 // *IS_ORDINARY to indicate whether this is a normal section index,
280 // rather than a special code between SHN_LORESERVE and
283 adjust_sym_shndx(unsigned int symndx
, unsigned int shndx
, bool* is_ordinary
)
285 if (shndx
< elfcpp::SHN_LORESERVE
)
287 else if (shndx
== elfcpp::SHN_XINDEX
)
289 if (this->xindex_
== NULL
)
290 this->xindex_
= this->do_initialize_xindex();
291 shndx
= this->xindex_
->sym_xindex_to_shndx(this, symndx
);
295 *is_ordinary
= false;
299 // Return the size of a section given a section index.
301 section_size(unsigned int shndx
)
302 { return this->do_section_size(shndx
); }
304 // Return the name of a section given a section index.
306 section_name(unsigned int shndx
)
307 { return this->do_section_name(shndx
); }
309 // Return the section flags given a section index.
311 section_flags(unsigned int shndx
)
312 { return this->do_section_flags(shndx
); }
314 // Return the section address given a section index.
316 section_address(unsigned int shndx
)
317 { return this->do_section_address(shndx
); }
319 // Return the section type given a section index.
321 section_type(unsigned int shndx
)
322 { return this->do_section_type(shndx
); }
324 // Return the section link field given a section index.
326 section_link(unsigned int shndx
)
327 { return this->do_section_link(shndx
); }
329 // Return the section info field given a section index.
331 section_info(unsigned int shndx
)
332 { return this->do_section_info(shndx
); }
334 // Return the required section alignment given a section index.
336 section_addralign(unsigned int shndx
)
337 { return this->do_section_addralign(shndx
); }
339 // Read the symbol information.
341 read_symbols(Read_symbols_data
* sd
)
342 { return this->do_read_symbols(sd
); }
344 // Pass sections which should be included in the link to the Layout
345 // object, and record where the sections go in the output file.
347 layout(Symbol_table
* symtab
, Layout
* layout
, Read_symbols_data
* sd
)
348 { this->do_layout(symtab
, layout
, sd
); }
350 // Add symbol information to the global symbol table.
352 add_symbols(Symbol_table
* symtab
, Read_symbols_data
* sd
)
353 { this->do_add_symbols(symtab
, sd
); }
355 // Functions and types for the elfcpp::Elf_file interface. This
356 // permit us to use Object as the File template parameter for
359 // The View class is returned by view. It must support a single
360 // method, data(). This is trivial, because get_view does what we
365 View(const unsigned char* p
)
374 const unsigned char* p_
;
379 view(off_t file_offset
, section_size_type data_size
)
380 { return View(this->get_view(file_offset
, data_size
, true, true)); }
384 error(const char* format
, ...) const ATTRIBUTE_PRINTF_2
;
386 // A location in the file.
392 Location(off_t fo
, section_size_type ds
)
393 : file_offset(fo
), data_size(ds
)
397 // Get a View given a Location.
398 View
view(Location loc
)
399 { return View(this->get_view(loc
.file_offset
, loc
.data_size
, true, true)); }
401 // Get a view into the underlying file.
403 get_view(off_t start
, section_size_type size
, bool aligned
, bool cache
)
405 return this->input_file()->file().get_view(this->offset_
, start
, size
,
409 // Get a lasting view into the underlying file.
411 get_lasting_view(off_t start
, section_size_type size
, bool aligned
,
414 return this->input_file()->file().get_lasting_view(this->offset_
, start
,
415 size
, aligned
, cache
);
418 // Read data from the underlying file.
420 read(off_t start
, section_size_type size
, void* p
)
421 { this->input_file()->file().read(start
+ this->offset_
, size
, p
); }
423 // Read multiple data from the underlying file.
425 read_multiple(const File_read::Read_multiple
& rm
)
426 { this->input_file()->file().read_multiple(this->offset_
, rm
); }
428 // Stop caching views in the underlying file.
430 clear_view_cache_marks()
431 { this->input_file()->file().clear_view_cache_marks(); }
433 // Get the number of global symbols defined by this object, and the
434 // number of the symbols whose final definition came from this
437 get_global_symbol_counts(const Symbol_table
* symtab
, size_t* defined
,
439 { this->do_get_global_symbol_counts(symtab
, defined
, used
); }
443 set_target(Target
* target
)
444 { this->target_
= target
; }
447 // Returns NULL for Objects that are not plugin objects. This method
448 // is overridden in the Pluginobj class.
453 // Read the symbols--implemented by child class.
455 do_read_symbols(Read_symbols_data
*) = 0;
457 // Lay out sections--implemented by child class.
459 do_layout(Symbol_table
*, Layout
*, Read_symbols_data
*) = 0;
461 // Add symbol information to the global symbol table--implemented by
464 do_add_symbols(Symbol_table
*, Read_symbols_data
*) = 0;
466 // Return the location of the contents of a section. Implemented by
469 do_section_contents(unsigned int shndx
) = 0;
471 // Get the size of a section--implemented by child class.
473 do_section_size(unsigned int shndx
) = 0;
475 // Get the name of a section--implemented by child class.
477 do_section_name(unsigned int shndx
) = 0;
479 // Get section flags--implemented by child class.
481 do_section_flags(unsigned int shndx
) = 0;
483 // Get section address--implemented by child class.
485 do_section_address(unsigned int shndx
) = 0;
487 // Get section type--implemented by child class.
489 do_section_type(unsigned int shndx
) = 0;
491 // Get section link field--implemented by child class.
493 do_section_link(unsigned int shndx
) = 0;
495 // Get section info field--implemented by child class.
497 do_section_info(unsigned int shndx
) = 0;
499 // Get section alignment--implemented by child class.
501 do_section_addralign(unsigned int shndx
) = 0;
503 // Return the Xindex structure to use.
505 do_initialize_xindex() = 0;
507 // Implement get_global_symbol_counts--implemented by child class.
509 do_get_global_symbol_counts(const Symbol_table
*, size_t*, size_t*) const = 0;
511 // Get the file. We pass on const-ness.
514 { return this->input_file_
; }
518 { return this->input_file_
; }
522 set_target(int machine
, int size
, bool big_endian
, int osabi
,
525 // Set the number of sections.
528 { this->shnum_
= shnum
; }
530 // Functions used by both Sized_relobj and Sized_dynobj.
532 // Read the section data into a Read_symbols_data object.
533 template<int size
, bool big_endian
>
535 read_section_data(elfcpp::Elf_file
<size
, big_endian
, Object
>*,
538 // Let the child class initialize the xindex object directly.
540 set_xindex(Xindex
* xindex
)
542 gold_assert(this->xindex_
== NULL
);
543 this->xindex_
= xindex
;
546 // If NAME is the name of a special .gnu.warning section, arrange
547 // for the warning to be issued. SHNDX is the section index.
548 // Return whether it is a warning section.
550 handle_gnu_warning_section(const char* name
, unsigned int shndx
,
554 // This class may not be copied.
555 Object(const Object
&);
556 Object
& operator=(const Object
&);
558 // Name of object as printed to user.
560 // For reading the file.
561 Input_file
* input_file_
;
562 // Offset within the file--0 for an object file, non-0 for an
565 // Number of input sections.
567 // Whether this is a dynamic object.
569 // Target functions--may be NULL if the target is not known.
571 // Many sections for objects with more than SHN_LORESERVE sections.
575 // Implement sized_target inline for efficiency. This approach breaks
576 // static type checking, but is made safe using asserts.
578 template<int size
, bool big_endian
>
579 inline Sized_target
<size
, big_endian
>*
580 Object::sized_target() const
582 gold_assert(this->target_
->get_size() == size
);
583 gold_assert(this->target_
->is_big_endian() ? big_endian
: !big_endian
);
584 return static_cast<Sized_target
<size
, big_endian
>*>(this->target_
);
587 // A regular object (ET_REL). This is an abstract base class itself.
588 // The implementation is the template class Sized_relobj.
590 class Relobj
: public Object
593 Relobj(const std::string
& name
, Input_file
* input_file
, off_t offset
= 0)
594 : Object(name
, input_file
, false, offset
),
596 map_to_relocatable_relocs_(NULL
),
597 object_merge_map_(NULL
),
598 relocs_must_follow_section_writes_(false)
603 read_relocs(Read_relocs_data
* rd
)
604 { return this->do_read_relocs(rd
); }
606 // Scan the relocs and adjust the symbol table.
608 scan_relocs(const General_options
& options
, Symbol_table
* symtab
,
609 Layout
* layout
, Read_relocs_data
* rd
)
610 { return this->do_scan_relocs(options
, symtab
, layout
, rd
); }
612 // The number of local symbols in the input symbol table.
614 local_symbol_count() const
615 { return this->do_local_symbol_count(); }
617 // Initial local symbol processing: count the number of local symbols
618 // in the output symbol table and dynamic symbol table; add local symbol
619 // names to *POOL and *DYNPOOL.
621 count_local_symbols(Stringpool_template
<char>* pool
,
622 Stringpool_template
<char>* dynpool
)
623 { return this->do_count_local_symbols(pool
, dynpool
); }
625 // Set the values of the local symbols, set the output symbol table
626 // indexes for the local variables, and set the offset where local
627 // symbol information will be stored. Returns the new local symbol index.
629 finalize_local_symbols(unsigned int index
, off_t off
)
630 { return this->do_finalize_local_symbols(index
, off
); }
632 // Set the output dynamic symbol table indexes for the local variables.
634 set_local_dynsym_indexes(unsigned int index
)
635 { return this->do_set_local_dynsym_indexes(index
); }
637 // Set the offset where local dynamic symbol information will be stored.
639 set_local_dynsym_offset(off_t off
)
640 { return this->do_set_local_dynsym_offset(off
); }
642 // Relocate the input sections and write out the local symbols.
644 relocate(const General_options
& options
, const Symbol_table
* symtab
,
645 const Layout
* layout
, Output_file
* of
)
646 { return this->do_relocate(options
, symtab
, layout
, of
); }
648 // Return whether an input section is being included in the link.
650 is_section_included(unsigned int shndx
) const
652 gold_assert(shndx
< this->output_sections_
.size());
653 return this->output_sections_
[shndx
] != NULL
;
656 // Given a section index, return the corresponding Output_section.
657 // The return value will be NULL if the section is not included in
660 output_section(unsigned int shndx
) const
662 gold_assert(shndx
< this->output_sections_
.size());
663 return this->output_sections_
[shndx
];
666 // Given a section index, return the offset in the Output_section.
667 // The return value will be -1U if the section is specially mapped,
668 // such as a merge section.
670 output_section_offset(unsigned int shndx
) const
671 { return this->do_output_section_offset(shndx
); }
673 // Set the offset of an input section within its output section.
675 set_section_offset(unsigned int shndx
, uint64_t off
)
676 { this->do_set_section_offset(shndx
, off
); }
678 // Return true if we need to wait for output sections to be written
679 // before we can apply relocations. This is true if the object has
680 // any relocations for sections which require special handling, such
681 // as the exception frame section.
683 relocs_must_follow_section_writes() const
684 { return this->relocs_must_follow_section_writes_
; }
686 // Return the object merge map.
689 { return this->object_merge_map_
; }
691 // Set the object merge map.
693 set_merge_map(Object_merge_map
* object_merge_map
)
695 gold_assert(this->object_merge_map_
== NULL
);
696 this->object_merge_map_
= object_merge_map
;
699 // Record the relocatable reloc info for an input reloc section.
701 set_relocatable_relocs(unsigned int reloc_shndx
, Relocatable_relocs
* rr
)
703 gold_assert(reloc_shndx
< this->shnum());
704 (*this->map_to_relocatable_relocs_
)[reloc_shndx
] = rr
;
707 // Get the relocatable reloc info for an input reloc section.
709 relocatable_relocs(unsigned int reloc_shndx
)
711 gold_assert(reloc_shndx
< this->shnum());
712 return (*this->map_to_relocatable_relocs_
)[reloc_shndx
];
715 // Layout sections whose layout was deferred while waiting for
716 // input files from a plugin.
718 layout_deferred_sections(Layout
* layout
)
719 { this->do_layout_deferred_sections(layout
); }
722 // The output section to be used for each input section, indexed by
723 // the input section number. The output section is NULL if the
724 // input section is to be discarded.
725 typedef std::vector
<Output_section
*> Output_sections
;
727 // Read the relocs--implemented by child class.
729 do_read_relocs(Read_relocs_data
*) = 0;
731 // Scan the relocs--implemented by child class.
733 do_scan_relocs(const General_options
&, Symbol_table
*, Layout
*,
734 Read_relocs_data
*) = 0;
736 // Return the number of local symbols--implemented by child class.
738 do_local_symbol_count() const = 0;
740 // Count local symbols--implemented by child class.
742 do_count_local_symbols(Stringpool_template
<char>*,
743 Stringpool_template
<char>*) = 0;
745 // Finalize the local symbols. Set the output symbol table indexes
746 // for the local variables, and set the offset where local symbol
747 // information will be stored.
749 do_finalize_local_symbols(unsigned int, off_t
) = 0;
751 // Set the output dynamic symbol table indexes for the local variables.
753 do_set_local_dynsym_indexes(unsigned int) = 0;
755 // Set the offset where local dynamic symbol information will be stored.
757 do_set_local_dynsym_offset(off_t
) = 0;
759 // Relocate the input sections and write out the local
760 // symbols--implemented by child class.
762 do_relocate(const General_options
& options
, const Symbol_table
* symtab
,
763 const Layout
*, Output_file
* of
) = 0;
765 // Get the offset of a section--implemented by child class.
767 do_output_section_offset(unsigned int shndx
) const = 0;
769 // Set the offset of a section--implemented by child class.
771 do_set_section_offset(unsigned int shndx
, uint64_t off
) = 0;
773 // Layout sections whose layout was deferred while waiting for
774 // input files from a plugin--implemented by child class.
776 do_layout_deferred_sections(Layout
*) = 0;
778 // Return the vector mapping input sections to output sections.
781 { return this->output_sections_
; }
783 const Output_sections
&
784 output_sections() const
785 { return this->output_sections_
; }
787 // Set the size of the relocatable relocs array.
789 size_relocatable_relocs()
791 this->map_to_relocatable_relocs_
=
792 new std::vector
<Relocatable_relocs
*>(this->shnum());
795 // Record that we must wait for the output sections to be written
796 // before applying relocations.
798 set_relocs_must_follow_section_writes()
799 { this->relocs_must_follow_section_writes_
= true; }
802 // Mapping from input sections to output section.
803 Output_sections output_sections_
;
804 // Mapping from input section index to the information recorded for
805 // the relocations. This is only used for a relocatable link.
806 std::vector
<Relocatable_relocs
*>* map_to_relocatable_relocs_
;
807 // Mappings for merge sections. This is managed by the code in the
809 Object_merge_map
* object_merge_map_
;
810 // Whether we need to wait for output sections to be written before
811 // we can apply relocations.
812 bool relocs_must_follow_section_writes_
;
815 // This class is used to handle relocations against a section symbol
816 // in an SHF_MERGE section. For such a symbol, we need to know the
817 // addend of the relocation before we can determine the final value.
818 // The addend gives us the location in the input section, and we can
819 // determine how it is mapped to the output section. For a
820 // non-section symbol, we apply the addend to the final value of the
821 // symbol; that is done in finalize_local_symbols, and does not use
825 class Merged_symbol_value
828 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Value
;
830 // We use a hash table to map offsets in the input section to output
832 typedef Unordered_map
<section_offset_type
, Value
> Output_addresses
;
834 Merged_symbol_value(Value input_value
, Value output_start_address
)
835 : input_value_(input_value
), output_start_address_(output_start_address
),
839 // Initialize the hash table.
841 initialize_input_to_output_map(const Relobj
*, unsigned int input_shndx
);
843 // Release the hash table to save space.
845 free_input_to_output_map()
846 { this->output_addresses_
.clear(); }
848 // Get the output value corresponding to an addend. The object and
849 // input section index are passed in because the caller will have
850 // them; otherwise we could store them here.
852 value(const Relobj
* object
, unsigned int input_shndx
, Value addend
) const
854 // This is a relocation against a section symbol. ADDEND is the
855 // offset in the section. The result should be the start of some
856 // merge area. If the object file wants something else, it should
857 // use a regular symbol rather than a section symbol.
858 // Unfortunately, PR 6658 shows a case in which the object file
859 // refers to the section symbol, but uses a negative ADDEND to
860 // compensate for a PC relative reloc. We can't handle the
861 // general case. However, we can handle the special case of a
862 // negative addend, by assuming that it refers to the start of the
863 // section. Of course, that means that we have to guess when
864 // ADDEND is negative. It is normal to see a 32-bit value here
865 // even when the template parameter size is 64, as 64-bit object
866 // file formats have 32-bit relocations. We know this is a merge
867 // section, so we know it has to fit into memory. So we assume
868 // that we won't see a value larger than a large 32-bit unsigned
869 // value. This will break objects with very very large merge
870 // sections; they probably break in other ways anyhow.
871 Value input_offset
= this->input_value_
;
872 if (addend
< 0xffffff00)
874 input_offset
+= addend
;
877 typename
Output_addresses::const_iterator p
=
878 this->output_addresses_
.find(input_offset
);
879 if (p
!= this->output_addresses_
.end())
880 return p
->second
+ addend
;
882 return (this->value_from_output_section(object
, input_shndx
, input_offset
)
887 // Get the output value for an input offset if we couldn't find it
888 // in the hash table.
890 value_from_output_section(const Relobj
*, unsigned int input_shndx
,
891 Value input_offset
) const;
893 // The value of the section symbol in the input file. This is
894 // normally zero, but could in principle be something else.
896 // The start address of this merged section in the output file.
897 Value output_start_address_
;
898 // A hash table which maps offsets in the input section to output
899 // addresses. This only maps specific offsets, not all offsets.
900 Output_addresses output_addresses_
;
903 // This POD class is holds the value of a symbol. This is used for
904 // local symbols, and for all symbols during relocation processing.
905 // For special sections, such as SHF_MERGE sections, this calls a
906 // function to get the final symbol value.
912 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Value
;
915 : output_symtab_index_(0), output_dynsym_index_(-1U), input_shndx_(0),
916 is_ordinary_shndx_(false), is_section_symbol_(false),
917 is_tls_symbol_(false), has_output_value_(true)
918 { this->u_
.value
= 0; }
920 // Get the value of this symbol. OBJECT is the object in which this
921 // symbol is defined, and ADDEND is an addend to add to the value.
922 template<bool big_endian
>
924 value(const Sized_relobj
<size
, big_endian
>* object
, Value addend
) const
926 if (this->has_output_value_
)
927 return this->u_
.value
+ addend
;
930 gold_assert(this->is_ordinary_shndx_
);
931 return this->u_
.merged_symbol_value
->value(object
, this->input_shndx_
,
936 // Set the value of this symbol in the output symbol table.
938 set_output_value(Value value
)
939 { this->u_
.value
= value
; }
941 // For a section symbol in a merged section, we need more
944 set_merged_symbol_value(Merged_symbol_value
<size
>* msv
)
946 gold_assert(this->is_section_symbol_
);
947 this->has_output_value_
= false;
948 this->u_
.merged_symbol_value
= msv
;
951 // Initialize the input to output map for a section symbol in a
952 // merged section. We also initialize the value of a non-section
953 // symbol in a merged section.
955 initialize_input_to_output_map(const Relobj
* object
)
957 if (!this->has_output_value_
)
959 gold_assert(this->is_section_symbol_
&& this->is_ordinary_shndx_
);
960 Merged_symbol_value
<size
>* msv
= this->u_
.merged_symbol_value
;
961 msv
->initialize_input_to_output_map(object
, this->input_shndx_
);
965 // Free the input to output map for a section symbol in a merged
968 free_input_to_output_map()
970 if (!this->has_output_value_
)
971 this->u_
.merged_symbol_value
->free_input_to_output_map();
974 // Set the value of the symbol from the input file. This is only
975 // called by count_local_symbols, to communicate the value to
976 // finalize_local_symbols.
978 set_input_value(Value value
)
979 { this->u_
.value
= value
; }
981 // Return the input value. This is only called by
982 // finalize_local_symbols and (in special cases) relocate_section.
985 { return this->u_
.value
; }
987 // Return whether this symbol should go into the output symbol
990 needs_output_symtab_entry() const
991 { return this->output_symtab_index_
!= -1U; }
993 // Return the index in the output symbol table.
995 output_symtab_index() const
997 gold_assert(this->output_symtab_index_
!= 0);
998 return this->output_symtab_index_
;
1001 // Set the index in the output symbol table.
1003 set_output_symtab_index(unsigned int i
)
1005 gold_assert(this->output_symtab_index_
== 0);
1006 this->output_symtab_index_
= i
;
1009 // Record that this symbol should not go into the output symbol
1012 set_no_output_symtab_entry()
1014 gold_assert(this->output_symtab_index_
== 0);
1015 this->output_symtab_index_
= -1U;
1018 // Set the index in the output dynamic symbol table.
1020 set_needs_output_dynsym_entry()
1022 gold_assert(!this->is_section_symbol());
1023 this->output_dynsym_index_
= 0;
1026 // Return whether this symbol should go into the output symbol
1029 needs_output_dynsym_entry() const
1031 return this->output_dynsym_index_
!= -1U;
1034 // Record that this symbol should go into the dynamic symbol table.
1036 set_output_dynsym_index(unsigned int i
)
1038 gold_assert(this->output_dynsym_index_
== 0);
1039 this->output_dynsym_index_
= i
;
1042 // Return the index in the output dynamic symbol table.
1044 output_dynsym_index() const
1046 gold_assert(this->output_dynsym_index_
!= 0
1047 && this->output_dynsym_index_
!= -1U);
1048 return this->output_dynsym_index_
;
1051 // Set the index of the input section in the input file.
1053 set_input_shndx(unsigned int i
, bool is_ordinary
)
1055 this->input_shndx_
= i
;
1056 // input_shndx_ field is a bitfield, so make sure that the value
1058 gold_assert(this->input_shndx_
== i
);
1059 this->is_ordinary_shndx_
= is_ordinary
;
1062 // Return the index of the input section in the input file.
1064 input_shndx(bool* is_ordinary
) const
1066 *is_ordinary
= this->is_ordinary_shndx_
;
1067 return this->input_shndx_
;
1070 // Whether this is a section symbol.
1072 is_section_symbol() const
1073 { return this->is_section_symbol_
; }
1075 // Record that this is a section symbol.
1077 set_is_section_symbol()
1079 gold_assert(!this->needs_output_dynsym_entry());
1080 this->is_section_symbol_
= true;
1083 // Record that this is a TLS symbol.
1086 { this->is_tls_symbol_
= true; }
1088 // Return TRUE if this is a TLS symbol.
1090 is_tls_symbol() const
1091 { return this->is_tls_symbol_
; }
1094 // The index of this local symbol in the output symbol table. This
1095 // will be -1 if the symbol should not go into the symbol table.
1096 unsigned int output_symtab_index_
;
1097 // The index of this local symbol in the dynamic symbol table. This
1098 // will be -1 if the symbol should not go into the symbol table.
1099 unsigned int output_dynsym_index_
;
1100 // The section index in the input file in which this symbol is
1102 unsigned int input_shndx_
: 28;
1103 // Whether the section index is an ordinary index, not a special
1105 bool is_ordinary_shndx_
: 1;
1106 // Whether this is a STT_SECTION symbol.
1107 bool is_section_symbol_
: 1;
1108 // Whether this is a STT_TLS symbol.
1109 bool is_tls_symbol_
: 1;
1110 // Whether this symbol has a value for the output file. This is
1111 // normally set to true during Layout::finalize, by
1112 // finalize_local_symbols. It will be false for a section symbol in
1113 // a merge section, as for such symbols we can not determine the
1114 // value to use in a relocation until we see the addend.
1115 bool has_output_value_
: 1;
1118 // This is used if has_output_value_ is true. Between
1119 // count_local_symbols and finalize_local_symbols, this is the
1120 // value in the input file. After finalize_local_symbols, it is
1121 // the value in the output file.
1123 // This is used if has_output_value_ is false. It points to the
1124 // information we need to get the value for a merge section.
1125 Merged_symbol_value
<size
>* merged_symbol_value
;
1129 // A GOT offset list. A symbol may have more than one GOT offset
1130 // (e.g., when mixing modules compiled with two different TLS models),
1131 // but will usually have at most one. GOT_TYPE identifies the type of
1132 // GOT entry; its values are specific to each target.
1134 class Got_offset_list
1138 : got_type_(-1U), got_offset_(0), got_next_(NULL
)
1141 Got_offset_list(unsigned int got_type
, unsigned int got_offset
)
1142 : got_type_(got_type
), got_offset_(got_offset
), got_next_(NULL
)
1147 if (this->got_next_
!= NULL
)
1149 delete this->got_next_
;
1150 this->got_next_
= NULL
;
1154 // Initialize the fields to their default values.
1158 this->got_type_
= -1U;
1159 this->got_offset_
= 0;
1160 this->got_next_
= NULL
;
1163 // Set the offset for the GOT entry of type GOT_TYPE.
1165 set_offset(unsigned int got_type
, unsigned int got_offset
)
1167 if (this->got_type_
== -1U)
1169 this->got_type_
= got_type
;
1170 this->got_offset_
= got_offset
;
1174 for (Got_offset_list
* g
= this; g
!= NULL
; g
= g
->got_next_
)
1176 if (g
->got_type_
== got_type
)
1178 g
->got_offset_
= got_offset
;
1182 Got_offset_list
* g
= new Got_offset_list(got_type
, got_offset
);
1183 g
->got_next_
= this->got_next_
;
1184 this->got_next_
= g
;
1188 // Return the offset for a GOT entry of type GOT_TYPE.
1190 get_offset(unsigned int got_type
) const
1192 for (const Got_offset_list
* g
= this; g
!= NULL
; g
= g
->got_next_
)
1194 if (g
->got_type_
== got_type
)
1195 return g
->got_offset_
;
1201 unsigned int got_type_
;
1202 unsigned int got_offset_
;
1203 Got_offset_list
* got_next_
;
1206 // A regular object file. This is size and endian specific.
1208 template<int size
, bool big_endian
>
1209 class Sized_relobj
: public Relobj
1212 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
1213 typedef std::vector
<Symbol
*> Symbols
;
1214 typedef std::vector
<Symbol_value
<size
> > Local_values
;
1216 static const Address invalid_address
= static_cast<Address
>(0) - 1;
1218 Sized_relobj(const std::string
& name
, Input_file
* input_file
, off_t offset
,
1219 const typename
elfcpp::Ehdr
<size
, big_endian
>&);
1223 // Set up the object file based on the ELF header.
1225 setup(const typename
elfcpp::Ehdr
<size
, big_endian
>&);
1227 // Return the number of symbols. This is only valid after
1228 // Object::add_symbols has been called.
1230 symbol_count() const
1231 { return this->local_symbol_count_
+ this->symbols_
.size(); }
1233 // If SYM is the index of a global symbol in the object file's
1234 // symbol table, return the Symbol object. Otherwise, return NULL.
1236 global_symbol(unsigned int sym
) const
1238 if (sym
>= this->local_symbol_count_
)
1240 gold_assert(sym
- this->local_symbol_count_
< this->symbols_
.size());
1241 return this->symbols_
[sym
- this->local_symbol_count_
];
1246 // Return the section index of symbol SYM. Set *VALUE to its value
1247 // in the object file. Set *IS_ORDINARY if this is an ordinary
1248 // section index, not a special code between SHN_LORESERVE and
1249 // SHN_HIRESERVE. Note that for a symbol which is not defined in
1250 // this object file, this will set *VALUE to 0 and return SHN_UNDEF;
1251 // it will not return the final value of the symbol in the link.
1253 symbol_section_and_value(unsigned int sym
, Address
* value
, bool* is_ordinary
);
1255 // Return a pointer to the Symbol_value structure which holds the
1256 // value of a local symbol.
1257 const Symbol_value
<size
>*
1258 local_symbol(unsigned int sym
) const
1260 gold_assert(sym
< this->local_values_
.size());
1261 return &this->local_values_
[sym
];
1264 // Return the index of local symbol SYM in the ordinary symbol
1265 // table. A value of -1U means that the symbol is not being output.
1267 symtab_index(unsigned int sym
) const
1269 gold_assert(sym
< this->local_values_
.size());
1270 return this->local_values_
[sym
].output_symtab_index();
1273 // Return the index of local symbol SYM in the dynamic symbol
1274 // table. A value of -1U means that the symbol is not being output.
1276 dynsym_index(unsigned int sym
) const
1278 gold_assert(sym
< this->local_values_
.size());
1279 return this->local_values_
[sym
].output_dynsym_index();
1282 // Return the input section index of local symbol SYM.
1284 local_symbol_input_shndx(unsigned int sym
, bool* is_ordinary
) const
1286 gold_assert(sym
< this->local_values_
.size());
1287 return this->local_values_
[sym
].input_shndx(is_ordinary
);
1290 // Return the appropriate Sized_target structure.
1291 Sized_target
<size
, big_endian
>*
1293 { return this->Object::sized_target
<size
, big_endian
>(); }
1295 // Record that local symbol SYM needs a dynamic symbol entry.
1297 set_needs_output_dynsym_entry(unsigned int sym
)
1299 gold_assert(sym
< this->local_values_
.size());
1300 this->local_values_
[sym
].set_needs_output_dynsym_entry();
1303 // Return whether the local symbol SYMNDX has a GOT offset.
1304 // For TLS symbols, the GOT entry will hold its tp-relative offset.
1306 local_has_got_offset(unsigned int symndx
, unsigned int got_type
) const
1308 Local_got_offsets::const_iterator p
=
1309 this->local_got_offsets_
.find(symndx
);
1310 return (p
!= this->local_got_offsets_
.end()
1311 && p
->second
->get_offset(got_type
) != -1U);
1314 // Return the GOT offset of the local symbol SYMNDX.
1316 local_got_offset(unsigned int symndx
, unsigned int got_type
) const
1318 Local_got_offsets::const_iterator p
=
1319 this->local_got_offsets_
.find(symndx
);
1320 gold_assert(p
!= this->local_got_offsets_
.end());
1321 unsigned int off
= p
->second
->get_offset(got_type
);
1322 gold_assert(off
!= -1U);
1326 // Set the GOT offset of the local symbol SYMNDX to GOT_OFFSET.
1328 set_local_got_offset(unsigned int symndx
, unsigned int got_type
,
1329 unsigned int got_offset
)
1331 Local_got_offsets::const_iterator p
=
1332 this->local_got_offsets_
.find(symndx
);
1333 if (p
!= this->local_got_offsets_
.end())
1334 p
->second
->set_offset(got_type
, got_offset
);
1337 Got_offset_list
* g
= new Got_offset_list(got_type
, got_offset
);
1338 std::pair
<Local_got_offsets::iterator
, bool> ins
=
1339 this->local_got_offsets_
.insert(std::make_pair(symndx
, g
));
1340 gold_assert(ins
.second
);
1344 // Get the offset of input section SHNDX within its output section.
1345 // This is -1 if the input section requires a special mapping, such
1346 // as a merge section. The output section can be found in the
1347 // output_sections_ field of the parent class Relobj.
1349 get_output_section_offset(unsigned int shndx
) const
1351 gold_assert(shndx
< this->section_offsets_
.size());
1352 return this->section_offsets_
[shndx
];
1355 // Return the name of the symbol that spans the given offset in the
1356 // specified section in this object. This is used only for error
1357 // messages and is not particularly efficient.
1359 get_symbol_location_info(unsigned int shndx
, off_t offset
,
1360 Symbol_location_info
* info
);
1362 // Look for a kept section corresponding to the given discarded section,
1363 // and return its output address. This is used only for relocations in
1364 // debugging sections.
1366 map_to_kept_section(unsigned int shndx
, bool* found
) const;
1369 // Read the symbols.
1371 do_read_symbols(Read_symbols_data
*);
1373 // Return the number of local symbols.
1375 do_local_symbol_count() const
1376 { return this->local_symbol_count_
; }
1378 // Lay out the input sections.
1380 do_layout(Symbol_table
*, Layout
*, Read_symbols_data
*);
1382 // Layout sections whose layout was deferred while waiting for
1383 // input files from a plugin.
1385 do_layout_deferred_sections(Layout
*);
1387 // Add the symbols to the symbol table.
1389 do_add_symbols(Symbol_table
*, Read_symbols_data
*);
1393 do_read_relocs(Read_relocs_data
*);
1395 // Scan the relocs and adjust the symbol table.
1397 do_scan_relocs(const General_options
&, Symbol_table
*, Layout
*,
1400 // Count the local symbols.
1402 do_count_local_symbols(Stringpool_template
<char>*,
1403 Stringpool_template
<char>*);
1405 // Finalize the local symbols.
1407 do_finalize_local_symbols(unsigned int, off_t
);
1409 // Set the offset where local dynamic symbol information will be stored.
1411 do_set_local_dynsym_indexes(unsigned int);
1413 // Set the offset where local dynamic symbol information will be stored.
1415 do_set_local_dynsym_offset(off_t
);
1417 // Relocate the input sections and write out the local symbols.
1419 do_relocate(const General_options
& options
, const Symbol_table
* symtab
,
1420 const Layout
*, Output_file
* of
);
1422 // Get the size of a section.
1424 do_section_size(unsigned int shndx
)
1425 { return this->elf_file_
.section_size(shndx
); }
1427 // Get the name of a section.
1429 do_section_name(unsigned int shndx
)
1430 { return this->elf_file_
.section_name(shndx
); }
1432 // Return the location of the contents of a section.
1434 do_section_contents(unsigned int shndx
)
1435 { return this->elf_file_
.section_contents(shndx
); }
1437 // Return section flags.
1439 do_section_flags(unsigned int shndx
)
1440 { return this->elf_file_
.section_flags(shndx
); }
1442 // Return section address.
1444 do_section_address(unsigned int shndx
)
1445 { return this->elf_file_
.section_addr(shndx
); }
1447 // Return section type.
1449 do_section_type(unsigned int shndx
)
1450 { return this->elf_file_
.section_type(shndx
); }
1452 // Return the section link field.
1454 do_section_link(unsigned int shndx
)
1455 { return this->elf_file_
.section_link(shndx
); }
1457 // Return the section info field.
1459 do_section_info(unsigned int shndx
)
1460 { return this->elf_file_
.section_info(shndx
); }
1462 // Return the section alignment.
1464 do_section_addralign(unsigned int shndx
)
1465 { return this->elf_file_
.section_addralign(shndx
); }
1467 // Return the Xindex structure to use.
1469 do_initialize_xindex();
1471 // Get symbol counts.
1473 do_get_global_symbol_counts(const Symbol_table
*, size_t*, size_t*) const;
1475 // Get the offset of a section.
1477 do_output_section_offset(unsigned int shndx
) const
1479 Address off
= this->get_output_section_offset(shndx
);
1480 if (off
== invalid_address
)
1485 // Set the offset of a section.
1487 do_set_section_offset(unsigned int shndx
, uint64_t off
)
1489 gold_assert(shndx
< this->section_offsets_
.size());
1490 this->section_offsets_
[shndx
] = convert_types
<Address
, uint64_t>(off
);
1495 typedef Sized_relobj
<size
, big_endian
> This
;
1496 static const int ehdr_size
= elfcpp::Elf_sizes
<size
>::ehdr_size
;
1497 static const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
1498 static const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
1499 typedef elfcpp::Shdr
<size
, big_endian
> Shdr
;
1501 // To keep track of discarded comdat sections, we need to map a member
1502 // section index to the object and section index of the corresponding
1504 struct Kept_comdat_section
1506 Kept_comdat_section(Sized_relobj
<size
, big_endian
>* object
,
1508 : object_(object
), shndx_(shndx
)
1510 Sized_relobj
<size
, big_endian
>* object_
;
1511 unsigned int shndx_
;
1513 typedef std::map
<unsigned int, Kept_comdat_section
*>
1514 Kept_comdat_section_table
;
1516 // Information needed to keep track of kept comdat groups. This is
1517 // simply a map from the section name to its section index. This may
1518 // not be a one-to-one mapping, but we ignore that possibility since
1519 // this is used only to attempt to handle stray relocations from
1520 // non-comdat debug sections that refer to comdat loadable sections.
1521 typedef Unordered_map
<std::string
, unsigned int> Comdat_group
;
1523 // A map from group section index to the table of group members.
1524 typedef std::map
<unsigned int, Comdat_group
*> Comdat_group_table
;
1526 // Find a comdat group table given its group section SHNDX.
1528 find_comdat_group(unsigned int shndx
) const
1530 Comdat_group_table::const_iterator p
=
1531 this->comdat_groups_
.find(shndx
);
1532 if (p
!= this->comdat_groups_
.end())
1537 // Record a new comdat group whose group section index is SHNDX.
1539 add_comdat_group(unsigned int shndx
, Comdat_group
* group
)
1540 { this->comdat_groups_
[shndx
] = group
; }
1542 // Adjust a section index if necessary.
1544 adjust_shndx(unsigned int shndx
)
1546 if (shndx
>= elfcpp::SHN_LORESERVE
)
1547 shndx
+= this->elf_file_
.large_shndx_offset();
1551 // Find the SHT_SYMTAB section, given the section headers.
1553 find_symtab(const unsigned char* pshdrs
);
1555 // Return whether SHDR has the right flags for a GNU style exception
1558 check_eh_frame_flags(const elfcpp::Shdr
<size
, big_endian
>* shdr
) const;
1560 // Return whether there is a section named .eh_frame which might be
1561 // a GNU style exception frame section.
1563 find_eh_frame(const unsigned char* pshdrs
, const char* names
,
1564 section_size_type names_size
) const;
1566 // Whether to include a section group in the link.
1568 include_section_group(Symbol_table
*, Layout
*, unsigned int, const char*,
1569 const unsigned char*, const char *, section_size_type
,
1570 std::vector
<bool>*);
1572 // Whether to include a linkonce section in the link.
1574 include_linkonce_section(Layout
*, unsigned int, const char*,
1575 const elfcpp::Shdr
<size
, big_endian
>&);
1577 // Layout an input section.
1579 layout_section(Layout
* layout
, unsigned int shndx
, const char* name
,
1580 typename
This::Shdr
& shdr
, unsigned int reloc_shndx
,
1581 unsigned int reloc_type
);
1583 // Views and sizes when relocating.
1586 unsigned char* view
;
1587 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
;
1589 section_size_type view_size
;
1590 bool is_input_output_view
;
1591 bool is_postprocessing_view
;
1594 typedef std::vector
<View_size
> Views
;
1596 // Write section data to the output file. Record the views and
1597 // sizes in VIEWS for use when relocating.
1599 write_sections(const unsigned char* pshdrs
, Output_file
*, Views
*);
1601 // Relocate the sections in the output file.
1603 relocate_sections(const General_options
& options
, const Symbol_table
*,
1604 const Layout
*, const unsigned char* pshdrs
, Views
*);
1606 // Scan the input relocations for --emit-relocs.
1608 emit_relocs_scan(const General_options
&, Symbol_table
*, Layout
*,
1609 const unsigned char* plocal_syms
,
1610 const Read_relocs_data::Relocs_list::iterator
&);
1612 // Scan the input relocations for --emit-relocs, templatized on the
1613 // type of the relocation section.
1614 template<int sh_type
>
1616 emit_relocs_scan_reltype(const General_options
&, Symbol_table
*, Layout
*,
1617 const unsigned char* plocal_syms
,
1618 const Read_relocs_data::Relocs_list::iterator
&,
1619 Relocatable_relocs
*);
1621 // Emit the relocs for --emit-relocs.
1623 emit_relocs(const Relocate_info
<size
, big_endian
>*, unsigned int,
1624 unsigned int sh_type
, const unsigned char* prelocs
,
1625 size_t reloc_count
, Output_section
*, Address output_offset
,
1626 unsigned char* view
, Address address
,
1627 section_size_type view_size
,
1628 unsigned char* reloc_view
, section_size_type reloc_view_size
);
1630 // Emit the relocs for --emit-relocs, templatized on the type of the
1631 // relocation section.
1632 template<int sh_type
>
1634 emit_relocs_reltype(const Relocate_info
<size
, big_endian
>*, unsigned int,
1635 const unsigned char* prelocs
, size_t reloc_count
,
1636 Output_section
*, Address output_offset
,
1637 unsigned char* view
, Address address
,
1638 section_size_type view_size
,
1639 unsigned char* reloc_view
,
1640 section_size_type reloc_view_size
);
1642 // Initialize input to output maps for section symbols in merged
1645 initialize_input_to_output_maps();
1647 // Free the input to output maps for section symbols in merged
1650 free_input_to_output_maps();
1652 // Write out the local symbols.
1654 write_local_symbols(Output_file
*,
1655 const Stringpool_template
<char>*,
1656 const Stringpool_template
<char>*,
1657 Output_symtab_xindex
*,
1658 Output_symtab_xindex
*);
1660 // Clear the local symbol information.
1662 clear_local_symbols()
1664 this->local_values_
.clear();
1665 this->local_got_offsets_
.clear();
1668 // Record a mapping from discarded section SHNDX to the corresponding
1671 set_kept_comdat_section(unsigned int shndx
, Kept_comdat_section
* kept
)
1673 this->kept_comdat_sections_
[shndx
] = kept
;
1676 // Find the kept section corresponding to the discarded section SHNDX.
1677 Kept_comdat_section
*
1678 get_kept_comdat_section(unsigned int shndx
) const
1680 typename
Kept_comdat_section_table::const_iterator p
=
1681 this->kept_comdat_sections_
.find(shndx
);
1682 if (p
== this->kept_comdat_sections_
.end())
1687 // The GOT offsets of local symbols. This map also stores GOT offsets
1688 // for tp-relative offsets for TLS symbols.
1689 typedef Unordered_map
<unsigned int, Got_offset_list
*> Local_got_offsets
;
1691 // The TLS GOT offsets of local symbols. The map stores the offsets
1692 // for either a single GOT entry that holds the module index of a TLS
1693 // symbol, or a pair of GOT entries containing the module index and
1694 // dtv-relative offset.
1695 struct Tls_got_entry
1697 Tls_got_entry(int got_offset
, bool have_pair
)
1698 : got_offset_(got_offset
),
1699 have_pair_(have_pair
)
1704 typedef Unordered_map
<unsigned int, Tls_got_entry
> Local_tls_got_offsets
;
1706 // Saved information for sections whose layout was deferred.
1707 struct Deferred_layout
1709 static const int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
1710 Deferred_layout(unsigned int shndx
, const char* name
,
1711 const unsigned char* pshdr
,
1712 unsigned int reloc_shndx
, unsigned int reloc_type
)
1713 : shndx_(shndx
), name_(name
), reloc_shndx_(reloc_shndx
),
1714 reloc_type_(reloc_type
)
1716 memcpy(this->shdr_data_
, pshdr
, shdr_size
);
1718 unsigned int shndx_
;
1720 unsigned int reloc_shndx_
;
1721 unsigned int reloc_type_
;
1722 unsigned char shdr_data_
[shdr_size
];
1725 // General access to the ELF file.
1726 elfcpp::Elf_file
<size
, big_endian
, Object
> elf_file_
;
1727 // Index of SHT_SYMTAB section.
1728 unsigned int symtab_shndx_
;
1729 // The number of local symbols.
1730 unsigned int local_symbol_count_
;
1731 // The number of local symbols which go into the output file.
1732 unsigned int output_local_symbol_count_
;
1733 // The number of local symbols which go into the output file's dynamic
1735 unsigned int output_local_dynsym_count_
;
1736 // The entries in the symbol table for the external symbols.
1738 // Number of symbols defined in object file itself.
1739 size_t defined_count_
;
1740 // File offset for local symbols.
1741 off_t local_symbol_offset_
;
1742 // File offset for local dynamic symbols.
1743 off_t local_dynsym_offset_
;
1744 // Values of local symbols.
1745 Local_values local_values_
;
1746 // GOT offsets for local non-TLS symbols, and tp-relative offsets
1747 // for TLS symbols, indexed by symbol number.
1748 Local_got_offsets local_got_offsets_
;
1749 // For each input section, the offset of the input section in its
1750 // output section. This is INVALID_ADDRESS if the input section requires a
1752 std::vector
<Address
> section_offsets_
;
1753 // Table mapping discarded comdat sections to corresponding kept sections.
1754 Kept_comdat_section_table kept_comdat_sections_
;
1755 // Table of kept comdat groups.
1756 Comdat_group_table comdat_groups_
;
1757 // Whether this object has a GNU style .eh_frame section.
1759 // The list of sections whose layout was deferred.
1760 std::vector
<Deferred_layout
> deferred_layout_
;
1763 // A class to manage the list of all objects.
1769 : relobj_list_(), dynobj_list_(), sonames_(), system_library_directory_(),
1773 // The type of the list of input relocateable objects.
1774 typedef std::vector
<Relobj
*> Relobj_list
;
1775 typedef Relobj_list::const_iterator Relobj_iterator
;
1777 // The type of the list of input dynamic objects.
1778 typedef std::vector
<Dynobj
*> Dynobj_list
;
1779 typedef Dynobj_list::const_iterator Dynobj_iterator
;
1781 // Add an object to the list. Return true if all is well, or false
1782 // if this object should be ignored.
1784 add_object(Object
*);
1786 // Start processing an archive.
1788 archive_start(Archive
*);
1790 // Stop processing an archive.
1792 archive_stop(Archive
*);
1794 // For each dynamic object, check whether we've seen all of its
1795 // explicit dependencies.
1797 check_dynamic_dependencies() const;
1799 // Return whether an object was found in the system library
1802 found_in_system_library_directory(const Object
*) const;
1804 // Print symbol counts.
1806 print_symbol_counts(const Symbol_table
*) const;
1808 // Iterate over all regular objects.
1811 relobj_begin() const
1812 { return this->relobj_list_
.begin(); }
1816 { return this->relobj_list_
.end(); }
1818 // Iterate over all dynamic objects.
1821 dynobj_begin() const
1822 { return this->dynobj_list_
.begin(); }
1826 { return this->dynobj_list_
.end(); }
1828 // Return whether we have seen any dynamic objects.
1831 { return !this->dynobj_list_
.empty(); }
1833 // Return the number of input objects.
1835 number_of_input_objects() const
1836 { return this->relobj_list_
.size() + this->dynobj_list_
.size(); }
1839 Input_objects(const Input_objects
&);
1840 Input_objects
& operator=(const Input_objects
&);
1842 // The list of ordinary objects included in the link.
1843 Relobj_list relobj_list_
;
1844 // The list of dynamic objects included in the link.
1845 Dynobj_list dynobj_list_
;
1846 // SONAMEs that we have seen.
1847 Unordered_set
<std::string
> sonames_
;
1848 // The directory in which we find the libc.so.
1849 std::string system_library_directory_
;
1850 // Manage cross-references if requested.
1854 // Some of the information we pass to the relocation routines. We
1855 // group this together to avoid passing a dozen different arguments.
1857 template<int size
, bool big_endian
>
1858 struct Relocate_info
1860 // Command line options.
1861 const General_options
* options
;
1863 const Symbol_table
* symtab
;
1865 const Layout
* layout
;
1866 // Object being relocated.
1867 Sized_relobj
<size
, big_endian
>* object
;
1868 // Section index of relocation section.
1869 unsigned int reloc_shndx
;
1870 // Section index of section being relocated.
1871 unsigned int data_shndx
;
1873 // Return a string showing the location of a relocation. This is
1874 // only used for error messages.
1876 location(size_t relnum
, off_t reloffset
) const;
1879 // Return an Object appropriate for the input file. P is BYTES long,
1880 // and holds the ELF header.
1883 make_elf_object(const std::string
& name
, Input_file
*,
1884 off_t offset
, const unsigned char* p
,
1885 section_offset_type bytes
);
1887 } // end namespace gold
1889 #endif // !defined(GOLD_OBJECT_H)