1 // symtab.h -- the gold symbol table -*- C++ -*-
11 #include "stringpool.h"
22 template<int size, bool big_endian>
25 template<int size, bool big_endian>
34 // The base class of an entry in the symbol table. The symbol table
35 // can have a lot of entries, so we don't want this class to big.
36 // Size dependent fields can be found in the template class
37 // Sized_symbol. Targets may support their own derived classes.
42 // Because we want the class to be small, we don't use any virtual
43 // functions. But because symbols can be defined in different
44 // places, we need to classify them. This enum is the different
45 // sources of symbols we support.
48 // Symbol defined in a relocatable or dynamic input file--this is
49 // the most common case.
51 // Symbol defined in an Output_data, a special section created by
54 // Symbol defined in an Output_segment, with no associated
57 // Symbol value is constant.
61 // When the source is IN_OUTPUT_SEGMENT, we need to describe what
63 enum Segment_offset_base
65 // From the start of the segment.
67 // From the end of the segment.
69 // From the filesz of the segment--i.e., after the loaded bytes
70 // but before the bytes which are allocated but zeroed.
74 // Return the symbol name.
77 { return this->name_; }
79 // Return the symbol version. This will return NULL for an
80 // unversioned symbol.
83 { return this->version_; }
85 // Return the symbol source.
88 { return this->source_; }
90 // Return the object with which this symbol is associated.
94 gold_assert(this->source_ == FROM_OBJECT);
95 return this->u_.from_object.object;
98 // Return the index of the section in the input relocatable or
99 // dynamic object file.
103 gold_assert(this->source_ == FROM_OBJECT);
104 return this->u_.from_object.shndx;
107 // Return the output data section with which this symbol is
108 // associated, if the symbol was specially defined with respect to
109 // an output data section.
113 gold_assert(this->source_ == IN_OUTPUT_DATA);
114 return this->u_.in_output_data.output_data;
117 // If this symbol was defined with respect to an output data
118 // section, return whether the value is an offset from end.
120 offset_is_from_end() const
122 gold_assert(this->source_ == IN_OUTPUT_DATA);
123 return this->u_.in_output_data.offset_is_from_end;
126 // Return the output segment with which this symbol is associated,
127 // if the symbol was specially defined with respect to an output
130 output_segment() const
132 gold_assert(this->source_ == IN_OUTPUT_SEGMENT);
133 return this->u_.in_output_segment.output_segment;
136 // If this symbol was defined with respect to an output segment,
137 // return the offset base.
141 gold_assert(this->source_ == IN_OUTPUT_SEGMENT);
142 return this->u_.in_output_segment.offset_base;
145 // Return the symbol binding.
148 { return this->binding_; }
150 // Return the symbol type.
153 { return this->type_; }
155 // Return the symbol visibility.
158 { return this->visibility_; }
160 // Return the non-visibility part of the st_other field.
163 { return this->nonvis_; }
165 // Return whether this symbol is a forwarder. This will never be
166 // true of a symbol found in the hash table, but may be true of
167 // symbol pointers attached to object files.
170 { return this->is_forwarder_; }
172 // Mark this symbol as a forwarder.
175 { this->is_forwarder_ = true; }
177 // Return whether this symbol needs an entry in the dynamic symbol
180 needs_dynsym_entry() const
181 { return this->needs_dynsym_entry_; }
183 // Mark this symbol as needing an entry in the dynamic symbol table.
185 set_needs_dynsym_entry()
186 { this->needs_dynsym_entry_ = true; }
188 // Mark this symbol as having been seen in a dynamic object.
191 { this->in_dyn_ = true; }
193 // Return the index of this symbol in the output file symbol table.
194 // A value of -1U means that this symbol is not going into the
195 // output file. This starts out as zero, and is set to a non-zero
196 // value by Symbol_table::finalize. It is an error to ask for the
197 // symbol table index before it has been set.
201 gold_assert(this->symtab_index_ != 0);
202 return this->symtab_index_;
205 // Set the index of the symbol in the output file symbol table.
207 set_symtab_index(unsigned int index)
209 gold_assert(index != 0);
210 this->symtab_index_ = index;
213 // Return whether this symbol already has an index in the output
214 // file symbol table.
216 has_symtab_index() const
217 { return this->symtab_index_ != 0; }
219 // Return the index of this symbol in the dynamic symbol table. A
220 // value of -1U means that this symbol is not going into the dynamic
221 // symbol table. This starts out as zero, and is set to a non-zero
222 // during Layout::finalize. It is an error to ask for the dynamic
223 // symbol table index before it has been set.
227 gold_assert(this->dynsym_index_ != 0);
228 return this->dynsym_index_;
231 // Set the index of the symbol in the dynamic symbol table.
233 set_dynsym_index(unsigned int index)
235 gold_assert(index != 0);
236 this->dynsym_index_ = index;
239 // Return whether this symbol already has an index in the dynamic
242 has_dynsym_index() const
243 { return this->dynsym_index_ != 0; }
245 // Return whether this symbol has an entry in the GOT section.
247 has_got_offset() const
248 { return this->has_got_offset_; }
250 // Return the offset into the GOT section of this symbol.
254 gold_assert(this->has_got_offset());
255 return this->got_offset_;
258 // Set the GOT offset of this symbol.
260 set_got_offset(unsigned int got_offset)
262 this->has_got_offset_ = true;
263 this->got_offset_ = got_offset;
266 // Return whether this symbol has an entry in the PLT section.
268 has_plt_offset() const
269 { return this->has_plt_offset_; }
271 // Return the offset into the PLT section of this symbol.
275 gold_assert(this->has_plt_offset());
276 return this->plt_offset_;
279 // Set the PLT offset of this symbol.
281 set_plt_offset(unsigned int plt_offset)
283 this->has_plt_offset_ = true;
284 this->plt_offset_ = plt_offset;
287 // Return true if the final value of this symbol is known at link
290 final_value_is_known(const General_options* options) const
292 if (options->is_shared())
294 return this->source_ != FROM_OBJECT || !this->object()->is_dynamic();
297 // Return whether this is a defined symbol (not undefined or
302 return (this->source_ != FROM_OBJECT
303 || (this->shndx() != elfcpp::SHN_UNDEF
304 && this->shndx() != elfcpp::SHN_COMMON));
307 // Return true if this symbol is from a dynamic object.
309 is_from_dynobj() const
311 return this->source_ == FROM_OBJECT && this->object()->is_dynamic();
314 // Return whether this is an undefined symbol.
318 return this->source_ == FROM_OBJECT && this->shndx() == elfcpp::SHN_UNDEF;
321 // Return whether this is a common symbol.
325 return (this->source_ == FROM_OBJECT
326 && (this->shndx() == elfcpp::SHN_COMMON
327 || this->type_ == elfcpp::STT_COMMON));
330 // Return whether there should be a warning for references to this
334 { return this->has_warning_; }
336 // Mark this symbol as having a warning.
339 { this->has_warning_ = true; }
342 // Instances of this class should always be created at a specific
345 { memset(this, 0, sizeof *this); }
347 // Initialize the general fields.
349 init_fields(const char* name, const char* version,
350 elfcpp::STT type, elfcpp::STB binding,
351 elfcpp::STV visibility, unsigned char nonvis);
353 // Initialize fields from an ELF symbol in OBJECT.
354 template<int size, bool big_endian>
356 init_base(const char *name, const char* version, Object* object,
357 const elfcpp::Sym<size, big_endian>&);
359 // Initialize fields for an Output_data.
361 init_base(const char* name, Output_data*, elfcpp::STT, elfcpp::STB,
362 elfcpp::STV, unsigned char nonvis, bool offset_is_from_end);
364 // Initialize fields for an Output_segment.
366 init_base(const char* name, Output_segment* os, elfcpp::STT type,
367 elfcpp::STB binding, elfcpp::STV visibility,
368 unsigned char nonvis, Segment_offset_base offset_base);
370 // Initialize fields for a constant.
372 init_base(const char* name, elfcpp::STT type, elfcpp::STB binding,
373 elfcpp::STV visibility, unsigned char nonvis);
375 // Override existing symbol.
376 template<int size, bool big_endian>
378 override_base(const elfcpp::Sym<size, big_endian>&, Object* object,
379 const char* version);
382 Symbol(const Symbol&);
383 Symbol& operator=(const Symbol&);
385 // Symbol name (expected to point into a Stringpool).
387 // Symbol version (expected to point into a Stringpool). This may
389 const char* version_;
393 // This struct is used if SOURCE_ == FROM_OBJECT.
396 // Object in which symbol is defined, or in which it was first
399 // Section number in object_ in which symbol is defined.
403 // This struct is used if SOURCE_ == IN_OUTPUT_DATA.
406 // Output_data in which symbol is defined. Before
407 // Layout::finalize the symbol's value is an offset within the
409 Output_data* output_data;
410 // True if the offset is from the end, false if the offset is
411 // from the beginning.
412 bool offset_is_from_end;
415 // This struct is used if SOURCE_ == IN_OUTPUT_SEGMENT.
418 // Output_segment in which the symbol is defined. Before
419 // Layout::finalize the symbol's value is an offset.
420 Output_segment* output_segment;
421 // The base to use for the offset before Layout::finalize.
422 Segment_offset_base offset_base;
426 // The index of this symbol in the output file. If the symbol is
427 // not going into the output file, this value is -1U. This field
428 // starts as always holding zero. It is set to a non-zero value by
429 // Symbol_table::finalize.
430 unsigned int symtab_index_;
432 // The index of this symbol in the dynamic symbol table. If the
433 // symbol is not going into the dynamic symbol table, this value is
434 // -1U. This field starts as always holding zero. It is set to a
435 // non-zero value during Layout::finalize.
436 unsigned int dynsym_index_;
438 // If this symbol has an entry in the GOT section (has_got_offset_
439 // is true), this is the offset from the start of the GOT section.
440 unsigned int got_offset_;
442 // If this symbol has an entry in the PLT section (has_plt_offset_
443 // is true), then this is the offset from the start of the PLT
445 unsigned int plt_offset_;
448 elfcpp::STT type_ : 4;
450 elfcpp::STB binding_ : 4;
451 // Symbol visibility.
452 elfcpp::STV visibility_ : 2;
453 // Rest of symbol st_other field.
454 unsigned int nonvis_ : 6;
455 // The type of symbol.
457 // True if this symbol always requires special target-specific
459 bool is_target_special_ : 1;
460 // True if this is the default version of the symbol.
462 // True if this symbol really forwards to another symbol. This is
463 // used when we discover after the fact that two different entries
464 // in the hash table really refer to the same symbol. This will
465 // never be set for a symbol found in the hash table, but may be set
466 // for a symbol found in the list of symbols attached to an Object.
467 // It forwards to the symbol found in the forwarders_ map of
469 bool is_forwarder_ : 1;
470 // True if this symbol needs to be in the dynamic symbol table.
471 bool needs_dynsym_entry_ : 1;
472 // True if we've seen this symbol in a dynamic object.
474 // True if the symbol has an entry in the GOT section.
475 bool has_got_offset_ : 1;
476 // True if the symbol has an entry in the PLT section.
477 bool has_plt_offset_ : 1;
478 // True if there is a warning for this symbol.
479 bool has_warning_ : 1;
482 // The parts of a symbol which are size specific. Using a template
483 // derived class like this helps us use less space on a 32-bit system.
486 class Sized_symbol : public Symbol
489 typedef typename elfcpp::Elf_types<size>::Elf_Addr Value_type;
490 typedef typename elfcpp::Elf_types<size>::Elf_WXword Size_type;
495 // Initialize fields from an ELF symbol in OBJECT.
496 template<bool big_endian>
498 init(const char *name, const char* version, Object* object,
499 const elfcpp::Sym<size, big_endian>&);
501 // Initialize fields for an Output_data.
503 init(const char* name, Output_data*, Value_type value, Size_type symsize,
504 elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis,
505 bool offset_is_from_end);
507 // Initialize fields for an Output_segment.
509 init(const char* name, Output_segment*, Value_type value, Size_type symsize,
510 elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis,
511 Segment_offset_base offset_base);
513 // Initialize fields for a constant.
515 init(const char* name, Value_type value, Size_type symsize,
516 elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis);
518 // Override existing symbol.
519 template<bool big_endian>
521 override(const elfcpp::Sym<size, big_endian>&, Object* object,
522 const char* version);
524 // Return the symbol's value.
527 { return this->value_; }
529 // Return the symbol's size (we can't call this 'size' because that
530 // is a template parameter).
533 { return this->symsize_; }
535 // Set the symbol size. This is used when resolving common symbols.
537 set_symsize(Size_type symsize)
538 { this->symsize_ = symsize; }
540 // Set the symbol value. This is called when we store the final
541 // values of the symbols into the symbol table.
543 set_value(Value_type value)
544 { this->value_ = value; }
547 Sized_symbol(const Sized_symbol&);
548 Sized_symbol& operator=(const Sized_symbol&);
550 // Symbol value. Before Layout::finalize this is the offset in the
551 // input section. This is set to the final value during
558 // A struct describing a symbol defined by the linker, where the value
559 // of the symbol is defined based on an output section. This is used
560 // for symbols defined by the linker, like "_init_array_start".
562 struct Define_symbol_in_section
566 // The name of the output section with which this symbol should be
567 // associated. If there is no output section with that name, the
568 // symbol will be defined as zero.
569 const char* output_section;
570 // The offset of the symbol within the output section. This is an
571 // offset from the start of the output section, unless start_at_end
572 // is true, in which case this is an offset from the end of the
575 // The size of the symbol.
579 // The symbol binding.
581 // The symbol visibility.
582 elfcpp::STV visibility;
583 // The rest of the st_other field.
584 unsigned char nonvis;
585 // If true, the value field is an offset from the end of the output
587 bool offset_is_from_end;
588 // If true, this symbol is defined only if we see a reference to it.
592 // A struct describing a symbol defined by the linker, where the value
593 // of the symbol is defined based on a segment. This is used for
594 // symbols defined by the linker, like "_end". We describe the
595 // segment with which the symbol should be associated by its
596 // characteristics. If no segment meets these characteristics, the
597 // symbol will be defined as zero. If there is more than one segment
598 // which meets these characteristics, we will use the first one.
600 struct Define_symbol_in_segment
604 // The segment type where the symbol should be defined, typically
606 elfcpp::PT segment_type;
607 // Bitmask of segment flags which must be set.
608 elfcpp::PF segment_flags_set;
609 // Bitmask of segment flags which must be clear.
610 elfcpp::PF segment_flags_clear;
611 // The offset of the symbol within the segment. The offset is
612 // calculated from the position set by offset_base.
614 // The size of the symbol.
618 // The symbol binding.
620 // The symbol visibility.
621 elfcpp::STV visibility;
622 // The rest of the st_other field.
623 unsigned char nonvis;
624 // The base from which we compute the offset.
625 Symbol::Segment_offset_base offset_base;
626 // If true, this symbol is defined only if we see a reference to it.
630 // This class manages warnings. Warnings are a GNU extension. When
631 // we see a section named .gnu.warning.SYM in an object file, and if
632 // we wind using the definition of SYM from that object file, then we
633 // will issue a warning for any relocation against SYM from a
634 // different object file. The text of the warning is the contents of
635 // the section. This is not precisely the definition used by the old
636 // GNU linker; the old GNU linker treated an occurrence of
637 // .gnu.warning.SYM as defining a warning symbol. A warning symbol
638 // would trigger a warning on any reference. However, it was
639 // inconsistent in that a warning in a dynamic object only triggered
640 // if there was no definition in a regular object. This linker is
641 // different in that we only issue a warning if we use the symbol
642 // definition from the same object file as the warning section.
651 // Add a warning for symbol NAME in section SHNDX in object OBJ.
653 add_warning(Symbol_table* symtab, const char* name, Object* obj,
656 // For each symbol for which we should give a warning, make a note
659 note_warnings(Symbol_table* symtab);
661 // Issue a warning for a reference to SYM at LOCATION.
663 issue_warning(const Symbol* sym, const std::string& location) const;
666 Warnings(const Warnings&);
667 Warnings& operator=(const Warnings&);
669 // What we need to know to get the warning text.
670 struct Warning_location
672 // The object the warning is in.
674 // The index of the warning section.
676 // The warning text if we have already loaded it.
680 : object(NULL), shndx(0), text()
684 set(Object* o, unsigned int s)
691 set_text(const char* t, off_t l)
692 { this->text.assign(t, l); }
695 // A mapping from warning symbol names (canonicalized in
696 // Symbol_table's namepool_ field) to
697 typedef Unordered_map<const char*, Warning_location> Warning_table;
699 Warning_table warnings_;
702 // The main linker symbol table.
711 // Add COUNT external symbols from the relocatable object RELOBJ to
712 // the symbol table. SYMS is the symbols, SYM_NAMES is their names,
713 // SYM_NAME_SIZE is the size of SYM_NAMES. This sets SYMPOINTERS to
714 // point to the symbols in the symbol table.
715 template<int size, bool big_endian>
717 add_from_relobj(Sized_relobj<size, big_endian>* relobj,
718 const unsigned char* syms, size_t count,
719 const char* sym_names, size_t sym_name_size,
720 Symbol** sympointers);
722 // Add COUNT dynamic symbols from the dynamic object DYNOBJ to the
723 // symbol table. SYMS is the symbols. SYM_NAMES is their names.
724 // SYM_NAME_SIZE is the size of SYM_NAMES. The other parameters are
725 // symbol version data.
726 template<int size, bool big_endian>
728 add_from_dynobj(Sized_dynobj<size, big_endian>* dynobj,
729 const unsigned char* syms, size_t count,
730 const char* sym_names, size_t sym_name_size,
731 const unsigned char* versym, size_t versym_size,
732 const std::vector<const char*>*);
734 // Define a special symbol based on an Output_data. It is a
735 // multiple definition error if this symbol is already defined.
737 define_in_output_data(const Target*, const char* name, const char* version,
738 Output_data*, uint64_t value, uint64_t symsize,
739 elfcpp::STT type, elfcpp::STB binding,
740 elfcpp::STV visibility, unsigned char nonvis,
741 bool offset_is_from_end, bool only_if_ref);
743 // Define a special symbol based on an Output_segment. It is a
744 // multiple definition error if this symbol is already defined.
746 define_in_output_segment(const Target*, const char* name,
747 const char* version, Output_segment*,
748 uint64_t value, uint64_t symsize,
749 elfcpp::STT type, elfcpp::STB binding,
750 elfcpp::STV visibility, unsigned char nonvis,
751 Symbol::Segment_offset_base, bool only_if_ref);
753 // Define a special symbol with a constant value. It is a multiple
754 // definition error if this symbol is already defined.
756 define_as_constant(const Target*, const char* name, const char* version,
757 uint64_t value, uint64_t symsize, elfcpp::STT type,
758 elfcpp::STB binding, elfcpp::STV visibility,
759 unsigned char nonvis, bool only_if_ref);
761 // Define a set of symbols in output sections.
763 define_symbols(const Layout*, const Target*, int count,
764 const Define_symbol_in_section*);
766 // Define a set of symbols in output segments.
768 define_symbols(const Layout*, const Target*, int count,
769 const Define_symbol_in_segment*);
773 lookup(const char*, const char* version = NULL) const;
775 // Return the real symbol associated with the forwarder symbol FROM.
777 resolve_forwards(const Symbol* from) const;
779 // Return the bitsize (32 or 64) of the symbols in the table.
782 { return this->size_; }
784 // Return the sized version of a symbol in this table.
787 get_sized_symbol(Symbol* ACCEPT_SIZE) const;
790 const Sized_symbol<size>*
791 get_sized_symbol(const Symbol* ACCEPT_SIZE) const;
793 // Return the count of undefined symbols seen.
795 saw_undefined() const
796 { return this->saw_undefined_; }
798 // Allocate the common symbols
800 allocate_commons(const General_options&, Layout*);
802 // Add a warning for symbol NAME in section SHNDX in object OBJ.
804 add_warning(const char* name, Object* obj, unsigned int shndx)
805 { this->warnings_.add_warning(this, name, obj, shndx); }
807 // Canonicalize a symbol name for use in the hash table.
809 canonicalize_name(const char* name)
810 { return this->namepool_.add(name, NULL); }
812 // Possibly issue a warning for a reference to SYM at LOCATION which
815 issue_warning(const Symbol* sym, const std::string& location) const
816 { this->warnings_.issue_warning(sym, location); }
818 // Set the dynamic symbol indexes. INDEX is the index of the first
819 // global dynamic symbol. Pointers to the symbols are stored into
820 // the vector. The names are stored into the Stringpool. This
821 // returns an updated dynamic symbol index.
823 set_dynsym_indexes(const General_options*, const Target*, unsigned int index,
824 std::vector<Symbol*>*, Stringpool*, Versions*);
826 // Finalize the symbol table after we have set the final addresses
827 // of all the input sections. This sets the final symbol indexes,
828 // values and adds the names to *POOL. INDEX is the index of the
829 // first global symbol. OFF is the file offset of the global symbol
830 // table, DYNOFF is the offset of the globals in the dynamic symbol
831 // table, DYN_GLOBAL_INDEX is the index of the first global dynamic
832 // symbol, and DYNCOUNT is the number of global dynamic symbols.
833 // This records the parameters, and returns the new file offset.
835 finalize(unsigned int index, off_t off, off_t dynoff,
836 size_t dyn_global_index, size_t dyncount, Stringpool* pool);
838 // Write out the global symbols.
840 write_globals(const Target*, const Stringpool*, const Stringpool*,
843 // Write out a section symbol. Return the updated offset.
845 write_section_symbol(const Target*, const Output_section*, Output_file*,
849 Symbol_table(const Symbol_table&);
850 Symbol_table& operator=(const Symbol_table&);
852 // Set the size (32 or 64) of the symbols in the table.
855 { this->size_ = size; }
857 // Make FROM a forwarder symbol to TO.
859 make_forwarder(Symbol* from, Symbol* to);
862 template<int size, bool big_endian>
864 add_from_object(Object*, const char *name, Stringpool::Key name_key,
865 const char *version, Stringpool::Key version_key,
866 bool def, const elfcpp::Sym<size, big_endian>& sym);
869 template<int size, bool big_endian>
871 resolve(Sized_symbol<size>* to,
872 const elfcpp::Sym<size, big_endian>& sym,
873 Object*, const char* version);
875 template<int size, bool big_endian>
877 resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from,
878 const char* version ACCEPT_SIZE_ENDIAN);
880 // Define a special symbol.
881 template<int size, bool big_endian>
883 define_special_symbol(const Target* target, const char* name,
884 const char* version, bool only_if_ref
887 // Define a symbol in an Output_data, sized version.
890 do_define_in_output_data(const Target*, const char* name,
891 const char* version, Output_data*,
892 typename elfcpp::Elf_types<size>::Elf_Addr value,
893 typename elfcpp::Elf_types<size>::Elf_WXword ssize,
894 elfcpp::STT type, elfcpp::STB binding,
895 elfcpp::STV visibility, unsigned char nonvis,
896 bool offset_is_from_end, bool only_if_ref);
898 // Define a symbol in an Output_segment, sized version.
901 do_define_in_output_segment(
902 const Target*, const char* name, const char* version, Output_segment* os,
903 typename elfcpp::Elf_types<size>::Elf_Addr value,
904 typename elfcpp::Elf_types<size>::Elf_WXword ssize,
905 elfcpp::STT type, elfcpp::STB binding,
906 elfcpp::STV visibility, unsigned char nonvis,
907 Symbol::Segment_offset_base offset_base, bool only_if_ref);
909 // Define a symbol as a constant, sized version.
912 do_define_as_constant(
913 const Target*, const char* name, const char* version,
914 typename elfcpp::Elf_types<size>::Elf_Addr value,
915 typename elfcpp::Elf_types<size>::Elf_WXword ssize,
916 elfcpp::STT type, elfcpp::STB binding,
917 elfcpp::STV visibility, unsigned char nonvis,
920 // Allocate the common symbols, sized version.
923 do_allocate_commons(const General_options&, Layout*);
925 // Finalize symbols specialized for size.
928 sized_finalize(unsigned int, off_t, Stringpool*);
930 // Write globals specialized for size and endianness.
931 template<int size, bool big_endian>
933 sized_write_globals(const Target*, const Stringpool*, const Stringpool*,
936 // Write out a symbol to P.
937 template<int size, bool big_endian>
939 sized_write_symbol(Sized_symbol<size>*, unsigned int shndx,
940 const Stringpool*, unsigned char* p
941 ACCEPT_SIZE_ENDIAN) const;
943 // Write out a section symbol, specialized for size and endianness.
944 template<int size, bool big_endian>
946 sized_write_section_symbol(const Output_section*, Output_file*, off_t) const;
948 // The type of the symbol hash table.
950 typedef std::pair<Stringpool::Key, Stringpool::Key> Symbol_table_key;
952 struct Symbol_table_hash
955 operator()(const Symbol_table_key&) const;
958 struct Symbol_table_eq
961 operator()(const Symbol_table_key&, const Symbol_table_key&) const;
964 typedef Unordered_map<Symbol_table_key, Symbol*, Symbol_table_hash,
965 Symbol_table_eq> Symbol_table_type;
967 // The type of the list of common symbols.
969 typedef std::vector<Symbol*> Commons_type;
971 // The size of the symbols in the symbol table (32 or 64).
974 // We increment this every time we see a new undefined symbol, for
975 // use in archive groups.
978 // The index of the first global symbol in the output file.
979 unsigned int first_global_index_;
981 // The file offset within the output symtab section where we should
985 // The number of global symbols we want to write out.
986 size_t output_count_;
988 // The file offset of the global dynamic symbols, or 0 if none.
989 off_t dynamic_offset_;
991 // The index of the first global dynamic symbol.
992 unsigned int first_dynamic_global_index_;
994 // The number of global dynamic symbols, or 0 if none.
995 off_t dynamic_count_;
997 // The symbol hash table.
998 Symbol_table_type table_;
1000 // A pool of symbol names. This is used for all global symbols.
1001 // Entries in the hash table point into this pool.
1002 Stringpool namepool_;
1004 // Forwarding symbols.
1005 Unordered_map<const Symbol*, Symbol*> forwarders_;
1007 // We don't expect there to be very many common symbols, so we keep
1008 // a list of them. When we find a common symbol we add it to this
1009 // list. It is possible that by the time we process the list the
1010 // symbol is no longer a common symbol. It may also have become a
1012 Commons_type commons_;
1014 // Manage symbol warnings.
1018 // We inline get_sized_symbol for efficiency.
1022 Symbol_table::get_sized_symbol(Symbol* sym ACCEPT_SIZE) const
1024 gold_assert(size == this->get_size());
1025 return static_cast<Sized_symbol<size>*>(sym);
1029 const Sized_symbol<size>*
1030 Symbol_table::get_sized_symbol(const Symbol* sym ACCEPT_SIZE) const
1032 gold_assert(size == this->get_size());
1033 return static_cast<const Sized_symbol<size>*>(sym);
1036 } // End namespace gold.
1038 #endif // !defined(GOLD_SYMTAB_H)