1 // symtab.h -- the gold symbol table -*- C++ -*-
3 // Copyright 2006, 2007 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.
31 #include "parameters.h"
32 #include "stringpool.h"
43 template<int size
, bool big_endian
>
46 template<int size
, bool big_endian
>
55 // The base class of an entry in the symbol table. The symbol table
56 // can have a lot of entries, so we don't want this class to big.
57 // Size dependent fields can be found in the template class
58 // Sized_symbol. Targets may support their own derived classes.
63 // Because we want the class to be small, we don't use any virtual
64 // functions. But because symbols can be defined in different
65 // places, we need to classify them. This enum is the different
66 // sources of symbols we support.
69 // Symbol defined in a relocatable or dynamic input file--this is
70 // the most common case.
72 // Symbol defined in an Output_data, a special section created by
75 // Symbol defined in an Output_segment, with no associated
78 // Symbol value is constant.
82 // When the source is IN_OUTPUT_SEGMENT, we need to describe what
84 enum Segment_offset_base
86 // From the start of the segment.
88 // From the end of the segment.
90 // From the filesz of the segment--i.e., after the loaded bytes
91 // but before the bytes which are allocated but zeroed.
95 // Return the symbol name.
98 { return this->name_
; }
100 // Return the symbol version. This will return NULL for an
101 // unversioned symbol.
104 { return this->version_
; }
106 // Return the symbol source.
109 { return this->source_
; }
111 // Return the object with which this symbol is associated.
115 gold_assert(this->source_
== FROM_OBJECT
);
116 return this->u_
.from_object
.object
;
119 // Return the index of the section in the input relocatable or
120 // dynamic object file.
124 gold_assert(this->source_
== FROM_OBJECT
);
125 return this->u_
.from_object
.shndx
;
128 // Return the output data section with which this symbol is
129 // associated, if the symbol was specially defined with respect to
130 // an output data section.
134 gold_assert(this->source_
== IN_OUTPUT_DATA
);
135 return this->u_
.in_output_data
.output_data
;
138 // If this symbol was defined with respect to an output data
139 // section, return whether the value is an offset from end.
141 offset_is_from_end() const
143 gold_assert(this->source_
== IN_OUTPUT_DATA
);
144 return this->u_
.in_output_data
.offset_is_from_end
;
147 // Return the output segment with which this symbol is associated,
148 // if the symbol was specially defined with respect to an output
151 output_segment() const
153 gold_assert(this->source_
== IN_OUTPUT_SEGMENT
);
154 return this->u_
.in_output_segment
.output_segment
;
157 // If this symbol was defined with respect to an output segment,
158 // return the offset base.
162 gold_assert(this->source_
== IN_OUTPUT_SEGMENT
);
163 return this->u_
.in_output_segment
.offset_base
;
166 // Return the symbol binding.
169 { return this->binding_
; }
171 // Return the symbol type.
174 { return this->type_
; }
176 // Return the symbol visibility.
179 { return this->visibility_
; }
181 // Return the non-visibility part of the st_other field.
184 { return this->nonvis_
; }
186 // Return whether this symbol is a forwarder. This will never be
187 // true of a symbol found in the hash table, but may be true of
188 // symbol pointers attached to object files.
191 { return this->is_forwarder_
; }
193 // Mark this symbol as a forwarder.
196 { this->is_forwarder_
= true; }
198 // Return whether this symbol needs an entry in the dynamic symbol
201 needs_dynsym_entry() const
203 return (this->needs_dynsym_entry_
204 || (this->in_reg() && this->in_dyn()));
207 // Mark this symbol as needing an entry in the dynamic symbol table.
209 set_needs_dynsym_entry()
210 { this->needs_dynsym_entry_
= true; }
212 // Return whether this symbol has been seen in a regular object.
215 { return this->in_reg_
; }
217 // Mark this symbol as having been seen in a regular object.
220 { this->in_reg_
= true; }
222 // Return whether this symbol has been seen in a dynamic object.
225 { return this->in_dyn_
; }
227 // Mark this symbol as having been seen in a dynamic object.
230 { this->in_dyn_
= true; }
232 // Return the index of this symbol in the output file symbol table.
233 // A value of -1U means that this symbol is not going into the
234 // output file. This starts out as zero, and is set to a non-zero
235 // value by Symbol_table::finalize. It is an error to ask for the
236 // symbol table index before it has been set.
240 gold_assert(this->symtab_index_
!= 0);
241 return this->symtab_index_
;
244 // Set the index of the symbol in the output file symbol table.
246 set_symtab_index(unsigned int index
)
248 gold_assert(index
!= 0);
249 this->symtab_index_
= index
;
252 // Return whether this symbol already has an index in the output
253 // file symbol table.
255 has_symtab_index() const
256 { return this->symtab_index_
!= 0; }
258 // Return the index of this symbol in the dynamic symbol table. A
259 // value of -1U means that this symbol is not going into the dynamic
260 // symbol table. This starts out as zero, and is set to a non-zero
261 // during Layout::finalize. It is an error to ask for the dynamic
262 // symbol table index before it has been set.
266 gold_assert(this->dynsym_index_
!= 0);
267 return this->dynsym_index_
;
270 // Set the index of the symbol in the dynamic symbol table.
272 set_dynsym_index(unsigned int index
)
274 gold_assert(index
!= 0);
275 this->dynsym_index_
= index
;
278 // Return whether this symbol already has an index in the dynamic
281 has_dynsym_index() const
282 { return this->dynsym_index_
!= 0; }
284 // Return whether this symbol has an entry in the GOT section.
286 has_got_offset() const
287 { return this->has_got_offset_
; }
289 // Return the offset into the GOT section of this symbol.
293 gold_assert(this->has_got_offset());
294 return this->got_offset_
;
297 // Set the GOT offset of this symbol.
299 set_got_offset(unsigned int got_offset
)
301 this->has_got_offset_
= true;
302 this->got_offset_
= got_offset
;
305 // Return whether this symbol has an entry in the PLT section.
307 has_plt_offset() const
308 { return this->has_plt_offset_
; }
310 // Return the offset into the PLT section of this symbol.
314 gold_assert(this->has_plt_offset());
315 return this->plt_offset_
;
318 // Set the PLT offset of this symbol.
320 set_plt_offset(unsigned int plt_offset
)
322 this->has_plt_offset_
= true;
323 this->plt_offset_
= plt_offset
;
326 // Return whether this dynamic symbol needs a special value in the
327 // dynamic symbol table.
329 needs_dynsym_value() const
330 { return this->needs_dynsym_value_
; }
332 // Set that this dynamic symbol needs a special value in the dynamic
335 set_needs_dynsym_value()
337 gold_assert(this->object()->is_dynamic());
338 this->needs_dynsym_value_
= true;
341 // Return true if the final value of this symbol is known at link
344 final_value_is_known() const;
346 // Return whether this is a defined symbol (not undefined or
351 return (this->source_
!= FROM_OBJECT
352 || (this->shndx() != elfcpp::SHN_UNDEF
353 && this->shndx() != elfcpp::SHN_COMMON
));
356 // Return true if this symbol is from a dynamic object.
358 is_from_dynobj() const
360 return this->source_
== FROM_OBJECT
&& this->object()->is_dynamic();
363 // Return whether this is an undefined symbol.
367 return this->source_
== FROM_OBJECT
&& this->shndx() == elfcpp::SHN_UNDEF
;
370 // Return whether this is a common symbol.
374 return (this->source_
== FROM_OBJECT
375 && (this->shndx() == elfcpp::SHN_COMMON
376 || this->type_
== elfcpp::STT_COMMON
));
379 // Return whether this symbol can be seen outside this object.
381 is_externally_visible() const
383 return (this->visibility_
== elfcpp::STV_DEFAULT
384 || this->visibility_
== elfcpp::STV_PROTECTED
);
387 // Return whether there should be a warning for references to this
391 { return this->has_warning_
; }
393 // Mark this symbol as having a warning.
396 { this->has_warning_
= true; }
399 // Instances of this class should always be created at a specific
402 { memset(this, 0, sizeof *this); }
404 // Initialize the general fields.
406 init_fields(const char* name
, const char* version
,
407 elfcpp::STT type
, elfcpp::STB binding
,
408 elfcpp::STV visibility
, unsigned char nonvis
);
410 // Initialize fields from an ELF symbol in OBJECT.
411 template<int size
, bool big_endian
>
413 init_base(const char *name
, const char* version
, Object
* object
,
414 const elfcpp::Sym
<size
, big_endian
>&);
416 // Initialize fields for an Output_data.
418 init_base(const char* name
, Output_data
*, elfcpp::STT
, elfcpp::STB
,
419 elfcpp::STV
, unsigned char nonvis
, bool offset_is_from_end
);
421 // Initialize fields for an Output_segment.
423 init_base(const char* name
, Output_segment
* os
, elfcpp::STT type
,
424 elfcpp::STB binding
, elfcpp::STV visibility
,
425 unsigned char nonvis
, Segment_offset_base offset_base
);
427 // Initialize fields for a constant.
429 init_base(const char* name
, elfcpp::STT type
, elfcpp::STB binding
,
430 elfcpp::STV visibility
, unsigned char nonvis
);
432 // Override existing symbol.
433 template<int size
, bool big_endian
>
435 override_base(const elfcpp::Sym
<size
, big_endian
>&, Object
* object
,
436 const char* version
);
438 // Override existing symbol with a special symbol.
440 override_base_with_special(const Symbol
* from
);
443 Symbol(const Symbol
&);
444 Symbol
& operator=(const Symbol
&);
446 // Symbol name (expected to point into a Stringpool).
448 // Symbol version (expected to point into a Stringpool). This may
450 const char* version_
;
454 // This struct is used if SOURCE_ == FROM_OBJECT.
457 // Object in which symbol is defined, or in which it was first
460 // Section number in object_ in which symbol is defined.
464 // This struct is used if SOURCE_ == IN_OUTPUT_DATA.
467 // Output_data in which symbol is defined. Before
468 // Layout::finalize the symbol's value is an offset within the
470 Output_data
* output_data
;
471 // True if the offset is from the end, false if the offset is
472 // from the beginning.
473 bool offset_is_from_end
;
476 // This struct is used if SOURCE_ == IN_OUTPUT_SEGMENT.
479 // Output_segment in which the symbol is defined. Before
480 // Layout::finalize the symbol's value is an offset.
481 Output_segment
* output_segment
;
482 // The base to use for the offset before Layout::finalize.
483 Segment_offset_base offset_base
;
487 // The index of this symbol in the output file. If the symbol is
488 // not going into the output file, this value is -1U. This field
489 // starts as always holding zero. It is set to a non-zero value by
490 // Symbol_table::finalize.
491 unsigned int symtab_index_
;
493 // The index of this symbol in the dynamic symbol table. If the
494 // symbol is not going into the dynamic symbol table, this value is
495 // -1U. This field starts as always holding zero. It is set to a
496 // non-zero value during Layout::finalize.
497 unsigned int dynsym_index_
;
499 // If this symbol has an entry in the GOT section (has_got_offset_
500 // is true), this is the offset from the start of the GOT section.
501 unsigned int got_offset_
;
503 // If this symbol has an entry in the PLT section (has_plt_offset_
504 // is true), then this is the offset from the start of the PLT
506 unsigned int plt_offset_
;
509 elfcpp::STT type_
: 4;
511 elfcpp::STB binding_
: 4;
512 // Symbol visibility.
513 elfcpp::STV visibility_
: 2;
514 // Rest of symbol st_other field.
515 unsigned int nonvis_
: 6;
516 // The type of symbol.
518 // True if this symbol always requires special target-specific
520 bool is_target_special_
: 1;
521 // True if this is the default version of the symbol.
523 // True if this symbol really forwards to another symbol. This is
524 // used when we discover after the fact that two different entries
525 // in the hash table really refer to the same symbol. This will
526 // never be set for a symbol found in the hash table, but may be set
527 // for a symbol found in the list of symbols attached to an Object.
528 // It forwards to the symbol found in the forwarders_ map of
530 bool is_forwarder_
: 1;
531 // True if this symbol needs to be in the dynamic symbol table.
532 bool needs_dynsym_entry_
: 1;
533 // True if we've seen this symbol in a regular object.
535 // True if we've seen this symbol in a dynamic object.
537 // True if the symbol has an entry in the GOT section.
538 bool has_got_offset_
: 1;
539 // True if the symbol has an entry in the PLT section.
540 bool has_plt_offset_
: 1;
541 // True if this is a dynamic symbol which needs a special value in
542 // the dynamic symbol table.
543 bool needs_dynsym_value_
: 1;
544 // True if there is a warning for this symbol.
545 bool has_warning_
: 1;
548 // The parts of a symbol which are size specific. Using a template
549 // derived class like this helps us use less space on a 32-bit system.
552 class Sized_symbol
: public Symbol
555 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Value_type
;
556 typedef typename
elfcpp::Elf_types
<size
>::Elf_WXword Size_type
;
561 // Initialize fields from an ELF symbol in OBJECT.
562 template<bool big_endian
>
564 init(const char *name
, const char* version
, Object
* object
,
565 const elfcpp::Sym
<size
, big_endian
>&);
567 // Initialize fields for an Output_data.
569 init(const char* name
, Output_data
*, Value_type value
, Size_type symsize
,
570 elfcpp::STT
, elfcpp::STB
, elfcpp::STV
, unsigned char nonvis
,
571 bool offset_is_from_end
);
573 // Initialize fields for an Output_segment.
575 init(const char* name
, Output_segment
*, Value_type value
, Size_type symsize
,
576 elfcpp::STT
, elfcpp::STB
, elfcpp::STV
, unsigned char nonvis
,
577 Segment_offset_base offset_base
);
579 // Initialize fields for a constant.
581 init(const char* name
, Value_type value
, Size_type symsize
,
582 elfcpp::STT
, elfcpp::STB
, elfcpp::STV
, unsigned char nonvis
);
584 // Override existing symbol.
585 template<bool big_endian
>
587 override(const elfcpp::Sym
<size
, big_endian
>&, Object
* object
,
588 const char* version
);
590 // Override existing symbol with a special symbol.
592 override_with_special(const Sized_symbol
<size
>*);
594 // Return the symbol's value.
597 { return this->value_
; }
599 // Return the symbol's size (we can't call this 'size' because that
600 // is a template parameter).
603 { return this->symsize_
; }
605 // Set the symbol size. This is used when resolving common symbols.
607 set_symsize(Size_type symsize
)
608 { this->symsize_
= symsize
; }
610 // Set the symbol value. This is called when we store the final
611 // values of the symbols into the symbol table.
613 set_value(Value_type value
)
614 { this->value_
= value
; }
617 Sized_symbol(const Sized_symbol
&);
618 Sized_symbol
& operator=(const Sized_symbol
&);
620 // Symbol value. Before Layout::finalize this is the offset in the
621 // input section. This is set to the final value during
628 // A struct describing a symbol defined by the linker, where the value
629 // of the symbol is defined based on an output section. This is used
630 // for symbols defined by the linker, like "_init_array_start".
632 struct Define_symbol_in_section
636 // The name of the output section with which this symbol should be
637 // associated. If there is no output section with that name, the
638 // symbol will be defined as zero.
639 const char* output_section
;
640 // The offset of the symbol within the output section. This is an
641 // offset from the start of the output section, unless start_at_end
642 // is true, in which case this is an offset from the end of the
645 // The size of the symbol.
649 // The symbol binding.
651 // The symbol visibility.
652 elfcpp::STV visibility
;
653 // The rest of the st_other field.
654 unsigned char nonvis
;
655 // If true, the value field is an offset from the end of the output
657 bool offset_is_from_end
;
658 // If true, this symbol is defined only if we see a reference to it.
662 // A struct describing a symbol defined by the linker, where the value
663 // of the symbol is defined based on a segment. This is used for
664 // symbols defined by the linker, like "_end". We describe the
665 // segment with which the symbol should be associated by its
666 // characteristics. If no segment meets these characteristics, the
667 // symbol will be defined as zero. If there is more than one segment
668 // which meets these characteristics, we will use the first one.
670 struct Define_symbol_in_segment
674 // The segment type where the symbol should be defined, typically
676 elfcpp::PT segment_type
;
677 // Bitmask of segment flags which must be set.
678 elfcpp::PF segment_flags_set
;
679 // Bitmask of segment flags which must be clear.
680 elfcpp::PF segment_flags_clear
;
681 // The offset of the symbol within the segment. The offset is
682 // calculated from the position set by offset_base.
684 // The size of the symbol.
688 // The symbol binding.
690 // The symbol visibility.
691 elfcpp::STV visibility
;
692 // The rest of the st_other field.
693 unsigned char nonvis
;
694 // The base from which we compute the offset.
695 Symbol::Segment_offset_base offset_base
;
696 // If true, this symbol is defined only if we see a reference to it.
700 // This class manages warnings. Warnings are a GNU extension. When
701 // we see a section named .gnu.warning.SYM in an object file, and if
702 // we wind using the definition of SYM from that object file, then we
703 // will issue a warning for any relocation against SYM from a
704 // different object file. The text of the warning is the contents of
705 // the section. This is not precisely the definition used by the old
706 // GNU linker; the old GNU linker treated an occurrence of
707 // .gnu.warning.SYM as defining a warning symbol. A warning symbol
708 // would trigger a warning on any reference. However, it was
709 // inconsistent in that a warning in a dynamic object only triggered
710 // if there was no definition in a regular object. This linker is
711 // different in that we only issue a warning if we use the symbol
712 // definition from the same object file as the warning section.
721 // Add a warning for symbol NAME in section SHNDX in object OBJ.
723 add_warning(Symbol_table
* symtab
, const char* name
, Object
* obj
,
726 // For each symbol for which we should give a warning, make a note
729 note_warnings(Symbol_table
* symtab
);
731 // Issue a warning for a reference to SYM at RELINFO's location.
732 template<int size
, bool big_endian
>
734 issue_warning(const Symbol
* sym
, const Relocate_info
<size
, big_endian
>*,
735 size_t relnum
, off_t reloffset
) const;
738 Warnings(const Warnings
&);
739 Warnings
& operator=(const Warnings
&);
741 // What we need to know to get the warning text.
742 struct Warning_location
744 // The object the warning is in.
746 // The index of the warning section.
748 // The warning text if we have already loaded it.
752 : object(NULL
), shndx(0), text()
756 set(Object
* o
, unsigned int s
)
763 set_text(const char* t
, off_t l
)
764 { this->text
.assign(t
, l
); }
767 // A mapping from warning symbol names (canonicalized in
768 // Symbol_table's namepool_ field) to
769 typedef Unordered_map
<const char*, Warning_location
> Warning_table
;
771 Warning_table warnings_
;
774 // The main linker symbol table.
783 // Add COUNT external symbols from the relocatable object RELOBJ to
784 // the symbol table. SYMS is the symbols, SYM_NAMES is their names,
785 // SYM_NAME_SIZE is the size of SYM_NAMES. This sets SYMPOINTERS to
786 // point to the symbols in the symbol table.
787 template<int size
, bool big_endian
>
789 add_from_relobj(Sized_relobj
<size
, big_endian
>* relobj
,
790 const unsigned char* syms
, size_t count
,
791 const char* sym_names
, size_t sym_name_size
,
792 Symbol
** sympointers
);
794 // Add COUNT dynamic symbols from the dynamic object DYNOBJ to the
795 // symbol table. SYMS is the symbols. SYM_NAMES is their names.
796 // SYM_NAME_SIZE is the size of SYM_NAMES. The other parameters are
797 // symbol version data.
798 template<int size
, bool big_endian
>
800 add_from_dynobj(Sized_dynobj
<size
, big_endian
>* dynobj
,
801 const unsigned char* syms
, size_t count
,
802 const char* sym_names
, size_t sym_name_size
,
803 const unsigned char* versym
, size_t versym_size
,
804 const std::vector
<const char*>*);
806 // Define a special symbol based on an Output_data. It is a
807 // multiple definition error if this symbol is already defined.
809 define_in_output_data(const Target
*, const char* name
, const char* version
,
810 Output_data
*, uint64_t value
, uint64_t symsize
,
811 elfcpp::STT type
, elfcpp::STB binding
,
812 elfcpp::STV visibility
, unsigned char nonvis
,
813 bool offset_is_from_end
, bool only_if_ref
);
815 // Define a special symbol based on an Output_segment. It is a
816 // multiple definition error if this symbol is already defined.
818 define_in_output_segment(const Target
*, const char* name
,
819 const char* version
, Output_segment
*,
820 uint64_t value
, uint64_t symsize
,
821 elfcpp::STT type
, elfcpp::STB binding
,
822 elfcpp::STV visibility
, unsigned char nonvis
,
823 Symbol::Segment_offset_base
, bool only_if_ref
);
825 // Define a special symbol with a constant value. It is a multiple
826 // definition error if this symbol is already defined.
828 define_as_constant(const Target
*, const char* name
, const char* version
,
829 uint64_t value
, uint64_t symsize
, elfcpp::STT type
,
830 elfcpp::STB binding
, elfcpp::STV visibility
,
831 unsigned char nonvis
, bool only_if_ref
);
833 // Define a set of symbols in output sections.
835 define_symbols(const Layout
*, const Target
*, int count
,
836 const Define_symbol_in_section
*);
838 // Define a set of symbols in output segments.
840 define_symbols(const Layout
*, const Target
*, int count
,
841 const Define_symbol_in_segment
*);
845 lookup(const char*, const char* version
= NULL
) const;
847 // Return the real symbol associated with the forwarder symbol FROM.
849 resolve_forwards(const Symbol
* from
) const;
851 // Return the sized version of a symbol in this table.
854 get_sized_symbol(Symbol
* ACCEPT_SIZE
) const;
857 const Sized_symbol
<size
>*
858 get_sized_symbol(const Symbol
* ACCEPT_SIZE
) const;
860 // Return the count of undefined symbols seen.
862 saw_undefined() const
863 { return this->saw_undefined_
; }
865 // Allocate the common symbols
867 allocate_commons(const General_options
&, Layout
*);
869 // Add a warning for symbol NAME in section SHNDX in object OBJ.
871 add_warning(const char* name
, Object
* obj
, unsigned int shndx
)
872 { this->warnings_
.add_warning(this, name
, obj
, shndx
); }
874 // Canonicalize a symbol name for use in the hash table.
876 canonicalize_name(const char* name
)
877 { return this->namepool_
.add(name
, true, NULL
); }
879 // Possibly issue a warning for a reference to SYM at LOCATION which
881 template<int size
, bool big_endian
>
883 issue_warning(const Symbol
* sym
,
884 const Relocate_info
<size
, big_endian
>* relinfo
,
885 size_t relnum
, off_t reloffset
) const
886 { this->warnings_
.issue_warning(sym
, relinfo
, relnum
, reloffset
); }
888 // Set the dynamic symbol indexes. INDEX is the index of the first
889 // global dynamic symbol. Pointers to the symbols are stored into
890 // the vector. The names are stored into the Stringpool. This
891 // returns an updated dynamic symbol index.
893 set_dynsym_indexes(const General_options
*, const Target
*, unsigned int index
,
894 std::vector
<Symbol
*>*, Stringpool
*, Versions
*);
896 // Finalize the symbol table after we have set the final addresses
897 // of all the input sections. This sets the final symbol indexes,
898 // values and adds the names to *POOL. INDEX is the index of the
899 // first global symbol. OFF is the file offset of the global symbol
900 // table, DYNOFF is the offset of the globals in the dynamic symbol
901 // table, DYN_GLOBAL_INDEX is the index of the first global dynamic
902 // symbol, and DYNCOUNT is the number of global dynamic symbols.
903 // This records the parameters, and returns the new file offset.
905 finalize(unsigned int index
, off_t off
, off_t dynoff
,
906 size_t dyn_global_index
, size_t dyncount
, Stringpool
* pool
);
908 // Write out the global symbols.
910 write_globals(const Target
*, const Stringpool
*, const Stringpool
*,
913 // Write out a section symbol. Return the updated offset.
915 write_section_symbol(const Output_section
*, Output_file
*, off_t
) const;
918 Symbol_table(const Symbol_table
&);
919 Symbol_table
& operator=(const Symbol_table
&);
921 // Make FROM a forwarder symbol to TO.
923 make_forwarder(Symbol
* from
, Symbol
* to
);
926 template<int size
, bool big_endian
>
928 add_from_object(Object
*, const char *name
, Stringpool::Key name_key
,
929 const char *version
, Stringpool::Key version_key
,
930 bool def
, const elfcpp::Sym
<size
, big_endian
>& sym
);
933 template<int size
, bool big_endian
>
935 resolve(Sized_symbol
<size
>* to
,
936 const elfcpp::Sym
<size
, big_endian
>& sym
,
937 Object
*, const char* version
);
939 template<int size
, bool big_endian
>
941 resolve(Sized_symbol
<size
>* to
, const Sized_symbol
<size
>* from
,
942 const char* version ACCEPT_SIZE_ENDIAN
);
944 // Whether we should override a symbol, based on flags in
947 should_override(const Symbol
*, unsigned int, bool*);
949 // Whether we should override a symbol with a special symbol which
950 // is automatically defined by the linker.
952 should_override_with_special(const Symbol
*);
954 // Define a special symbol.
955 template<int size
, bool big_endian
>
957 define_special_symbol(const Target
* target
, const char** pname
,
958 const char** pversion
, bool only_if_ref
,
959 Sized_symbol
<size
>** poldsym ACCEPT_SIZE_ENDIAN
);
961 // Define a symbol in an Output_data, sized version.
964 do_define_in_output_data(const Target
*, const char* name
,
965 const char* version
, Output_data
*,
966 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
967 typename
elfcpp::Elf_types
<size
>::Elf_WXword ssize
,
968 elfcpp::STT type
, elfcpp::STB binding
,
969 elfcpp::STV visibility
, unsigned char nonvis
,
970 bool offset_is_from_end
, bool only_if_ref
);
972 // Define a symbol in an Output_segment, sized version.
975 do_define_in_output_segment(
976 const Target
*, const char* name
, const char* version
, Output_segment
* os
,
977 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
978 typename
elfcpp::Elf_types
<size
>::Elf_WXword ssize
,
979 elfcpp::STT type
, elfcpp::STB binding
,
980 elfcpp::STV visibility
, unsigned char nonvis
,
981 Symbol::Segment_offset_base offset_base
, bool only_if_ref
);
983 // Define a symbol as a constant, sized version.
986 do_define_as_constant(
987 const Target
*, const char* name
, const char* version
,
988 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
989 typename
elfcpp::Elf_types
<size
>::Elf_WXword ssize
,
990 elfcpp::STT type
, elfcpp::STB binding
,
991 elfcpp::STV visibility
, unsigned char nonvis
,
994 // Allocate the common symbols, sized version.
997 do_allocate_commons(const General_options
&, Layout
*);
999 // Finalize symbols specialized for size.
1002 sized_finalize(unsigned int, off_t
, Stringpool
*);
1004 // Write globals specialized for size and endianness.
1005 template<int size
, bool big_endian
>
1007 sized_write_globals(const Target
*, const Stringpool
*, const Stringpool
*,
1008 Output_file
*) const;
1010 // Write out a symbol to P.
1011 template<int size
, bool big_endian
>
1013 sized_write_symbol(Sized_symbol
<size
>*,
1014 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
1016 const Stringpool
*, unsigned char* p
1017 ACCEPT_SIZE_ENDIAN
) const;
1019 // Write out a section symbol, specialized for size and endianness.
1020 template<int size
, bool big_endian
>
1022 sized_write_section_symbol(const Output_section
*, Output_file
*, off_t
) const;
1024 // The type of the symbol hash table.
1026 typedef std::pair
<Stringpool::Key
, Stringpool::Key
> Symbol_table_key
;
1028 struct Symbol_table_hash
1031 operator()(const Symbol_table_key
&) const;
1034 struct Symbol_table_eq
1037 operator()(const Symbol_table_key
&, const Symbol_table_key
&) const;
1040 typedef Unordered_map
<Symbol_table_key
, Symbol
*, Symbol_table_hash
,
1041 Symbol_table_eq
> Symbol_table_type
;
1043 // The type of the list of common symbols.
1045 typedef std::vector
<Symbol
*> Commons_type
;
1047 // We increment this every time we see a new undefined symbol, for
1048 // use in archive groups.
1051 // The index of the first global symbol in the output file.
1052 unsigned int first_global_index_
;
1054 // The file offset within the output symtab section where we should
1058 // The number of global symbols we want to write out.
1059 size_t output_count_
;
1061 // The file offset of the global dynamic symbols, or 0 if none.
1062 off_t dynamic_offset_
;
1064 // The index of the first global dynamic symbol.
1065 unsigned int first_dynamic_global_index_
;
1067 // The number of global dynamic symbols, or 0 if none.
1068 off_t dynamic_count_
;
1070 // The symbol hash table.
1071 Symbol_table_type table_
;
1073 // A pool of symbol names. This is used for all global symbols.
1074 // Entries in the hash table point into this pool.
1075 Stringpool namepool_
;
1077 // Forwarding symbols.
1078 Unordered_map
<const Symbol
*, Symbol
*> forwarders_
;
1080 // We don't expect there to be very many common symbols, so we keep
1081 // a list of them. When we find a common symbol we add it to this
1082 // list. It is possible that by the time we process the list the
1083 // symbol is no longer a common symbol. It may also have become a
1085 Commons_type commons_
;
1087 // Manage symbol warnings.
1091 // We inline get_sized_symbol for efficiency.
1095 Symbol_table::get_sized_symbol(Symbol
* sym ACCEPT_SIZE
) const
1097 gold_assert(size
== parameters
->get_size());
1098 return static_cast<Sized_symbol
<size
>*>(sym
);
1102 const Sized_symbol
<size
>*
1103 Symbol_table::get_sized_symbol(const Symbol
* sym ACCEPT_SIZE
) const
1105 gold_assert(size
== parameters
->get_size());
1106 return static_cast<const Sized_symbol
<size
>*>(sym
);
1109 } // End namespace gold.
1111 #endif // !defined(GOLD_SYMTAB_H)