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 // Return whether this symbol has been seen in a regular object.
191 { return this->in_reg_; }
193 // Mark this symbol as having been seen in a regular object.
196 { this->in_reg_ = true; }
198 // Mark this symbol as having been seen in a dynamic object.
201 { this->in_dyn_ = true; }
203 // Return the index of this symbol in the output file symbol table.
204 // A value of -1U means that this symbol is not going into the
205 // output file. This starts out as zero, and is set to a non-zero
206 // value by Symbol_table::finalize. It is an error to ask for the
207 // symbol table index before it has been set.
211 gold_assert(this->symtab_index_ != 0);
212 return this->symtab_index_;
215 // Set the index of the symbol in the output file symbol table.
217 set_symtab_index(unsigned int index)
219 gold_assert(index != 0);
220 this->symtab_index_ = index;
223 // Return whether this symbol already has an index in the output
224 // file symbol table.
226 has_symtab_index() const
227 { return this->symtab_index_ != 0; }
229 // Return the index of this symbol in the dynamic symbol table. A
230 // value of -1U means that this symbol is not going into the dynamic
231 // symbol table. This starts out as zero, and is set to a non-zero
232 // during Layout::finalize. It is an error to ask for the dynamic
233 // symbol table index before it has been set.
237 gold_assert(this->dynsym_index_ != 0);
238 return this->dynsym_index_;
241 // Set the index of the symbol in the dynamic symbol table.
243 set_dynsym_index(unsigned int index)
245 gold_assert(index != 0);
246 this->dynsym_index_ = index;
249 // Return whether this symbol already has an index in the dynamic
252 has_dynsym_index() const
253 { return this->dynsym_index_ != 0; }
255 // Return whether this symbol has an entry in the GOT section.
257 has_got_offset() const
258 { return this->has_got_offset_; }
260 // Return the offset into the GOT section of this symbol.
264 gold_assert(this->has_got_offset());
265 return this->got_offset_;
268 // Set the GOT offset of this symbol.
270 set_got_offset(unsigned int got_offset)
272 this->has_got_offset_ = true;
273 this->got_offset_ = got_offset;
276 // Return whether this symbol has an entry in the PLT section.
278 has_plt_offset() const
279 { return this->has_plt_offset_; }
281 // Return the offset into the PLT section of this symbol.
285 gold_assert(this->has_plt_offset());
286 return this->plt_offset_;
289 // Set the PLT offset of this symbol.
291 set_plt_offset(unsigned int plt_offset)
293 this->has_plt_offset_ = true;
294 this->plt_offset_ = plt_offset;
297 // Return true if the final value of this symbol is known at link
300 final_value_is_known(const General_options* options) const
302 if (options->is_shared())
304 return this->source_ != FROM_OBJECT || !this->object()->is_dynamic();
307 // Return whether this is a defined symbol (not undefined or
312 return (this->source_ != FROM_OBJECT
313 || (this->shndx() != elfcpp::SHN_UNDEF
314 && this->shndx() != elfcpp::SHN_COMMON));
317 // Return true if this symbol is from a dynamic object.
319 is_from_dynobj() const
321 return this->source_ == FROM_OBJECT && this->object()->is_dynamic();
324 // Return whether this is an undefined symbol.
328 return this->source_ == FROM_OBJECT && this->shndx() == elfcpp::SHN_UNDEF;
331 // Return whether this is a common symbol.
335 return (this->source_ == FROM_OBJECT
336 && (this->shndx() == elfcpp::SHN_COMMON
337 || this->type_ == elfcpp::STT_COMMON));
340 // Return whether there should be a warning for references to this
344 { return this->has_warning_; }
346 // Mark this symbol as having a warning.
349 { this->has_warning_ = true; }
352 // Instances of this class should always be created at a specific
355 { memset(this, 0, sizeof *this); }
357 // Initialize the general fields.
359 init_fields(const char* name, const char* version,
360 elfcpp::STT type, elfcpp::STB binding,
361 elfcpp::STV visibility, unsigned char nonvis);
363 // Initialize fields from an ELF symbol in OBJECT.
364 template<int size, bool big_endian>
366 init_base(const char *name, const char* version, Object* object,
367 const elfcpp::Sym<size, big_endian>&);
369 // Initialize fields for an Output_data.
371 init_base(const char* name, Output_data*, elfcpp::STT, elfcpp::STB,
372 elfcpp::STV, unsigned char nonvis, bool offset_is_from_end);
374 // Initialize fields for an Output_segment.
376 init_base(const char* name, Output_segment* os, elfcpp::STT type,
377 elfcpp::STB binding, elfcpp::STV visibility,
378 unsigned char nonvis, Segment_offset_base offset_base);
380 // Initialize fields for a constant.
382 init_base(const char* name, elfcpp::STT type, elfcpp::STB binding,
383 elfcpp::STV visibility, unsigned char nonvis);
385 // Override existing symbol.
386 template<int size, bool big_endian>
388 override_base(const elfcpp::Sym<size, big_endian>&, Object* object,
389 const char* version);
392 Symbol(const Symbol&);
393 Symbol& operator=(const Symbol&);
395 // Symbol name (expected to point into a Stringpool).
397 // Symbol version (expected to point into a Stringpool). This may
399 const char* version_;
403 // This struct is used if SOURCE_ == FROM_OBJECT.
406 // Object in which symbol is defined, or in which it was first
409 // Section number in object_ in which symbol is defined.
413 // This struct is used if SOURCE_ == IN_OUTPUT_DATA.
416 // Output_data in which symbol is defined. Before
417 // Layout::finalize the symbol's value is an offset within the
419 Output_data* output_data;
420 // True if the offset is from the end, false if the offset is
421 // from the beginning.
422 bool offset_is_from_end;
425 // This struct is used if SOURCE_ == IN_OUTPUT_SEGMENT.
428 // Output_segment in which the symbol is defined. Before
429 // Layout::finalize the symbol's value is an offset.
430 Output_segment* output_segment;
431 // The base to use for the offset before Layout::finalize.
432 Segment_offset_base offset_base;
436 // The index of this symbol in the output file. If the symbol is
437 // not going into the output file, this value is -1U. This field
438 // starts as always holding zero. It is set to a non-zero value by
439 // Symbol_table::finalize.
440 unsigned int symtab_index_;
442 // The index of this symbol in the dynamic symbol table. If the
443 // symbol is not going into the dynamic symbol table, this value is
444 // -1U. This field starts as always holding zero. It is set to a
445 // non-zero value during Layout::finalize.
446 unsigned int dynsym_index_;
448 // If this symbol has an entry in the GOT section (has_got_offset_
449 // is true), this is the offset from the start of the GOT section.
450 unsigned int got_offset_;
452 // If this symbol has an entry in the PLT section (has_plt_offset_
453 // is true), then this is the offset from the start of the PLT
455 unsigned int plt_offset_;
458 elfcpp::STT type_ : 4;
460 elfcpp::STB binding_ : 4;
461 // Symbol visibility.
462 elfcpp::STV visibility_ : 2;
463 // Rest of symbol st_other field.
464 unsigned int nonvis_ : 6;
465 // The type of symbol.
467 // True if this symbol always requires special target-specific
469 bool is_target_special_ : 1;
470 // True if this is the default version of the symbol.
472 // True if this symbol really forwards to another symbol. This is
473 // used when we discover after the fact that two different entries
474 // in the hash table really refer to the same symbol. This will
475 // never be set for a symbol found in the hash table, but may be set
476 // for a symbol found in the list of symbols attached to an Object.
477 // It forwards to the symbol found in the forwarders_ map of
479 bool is_forwarder_ : 1;
480 // True if this symbol needs to be in the dynamic symbol table.
481 bool needs_dynsym_entry_ : 1;
482 // True if we've seen this symbol in a regular object.
484 // True if we've seen this symbol in a dynamic object.
486 // True if the symbol has an entry in the GOT section.
487 bool has_got_offset_ : 1;
488 // True if the symbol has an entry in the PLT section.
489 bool has_plt_offset_ : 1;
490 // True if there is a warning for this symbol.
491 bool has_warning_ : 1;
494 // The parts of a symbol which are size specific. Using a template
495 // derived class like this helps us use less space on a 32-bit system.
498 class Sized_symbol : public Symbol
501 typedef typename elfcpp::Elf_types<size>::Elf_Addr Value_type;
502 typedef typename elfcpp::Elf_types<size>::Elf_WXword Size_type;
507 // Initialize fields from an ELF symbol in OBJECT.
508 template<bool big_endian>
510 init(const char *name, const char* version, Object* object,
511 const elfcpp::Sym<size, big_endian>&);
513 // Initialize fields for an Output_data.
515 init(const char* name, Output_data*, Value_type value, Size_type symsize,
516 elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis,
517 bool offset_is_from_end);
519 // Initialize fields for an Output_segment.
521 init(const char* name, Output_segment*, Value_type value, Size_type symsize,
522 elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis,
523 Segment_offset_base offset_base);
525 // Initialize fields for a constant.
527 init(const char* name, Value_type value, Size_type symsize,
528 elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis);
530 // Override existing symbol.
531 template<bool big_endian>
533 override(const elfcpp::Sym<size, big_endian>&, Object* object,
534 const char* version);
536 // Return the symbol's value.
539 { return this->value_; }
541 // Return the symbol's size (we can't call this 'size' because that
542 // is a template parameter).
545 { return this->symsize_; }
547 // Set the symbol size. This is used when resolving common symbols.
549 set_symsize(Size_type symsize)
550 { this->symsize_ = symsize; }
552 // Set the symbol value. This is called when we store the final
553 // values of the symbols into the symbol table.
555 set_value(Value_type value)
556 { this->value_ = value; }
559 Sized_symbol(const Sized_symbol&);
560 Sized_symbol& operator=(const Sized_symbol&);
562 // Symbol value. Before Layout::finalize this is the offset in the
563 // input section. This is set to the final value during
570 // A struct describing a symbol defined by the linker, where the value
571 // of the symbol is defined based on an output section. This is used
572 // for symbols defined by the linker, like "_init_array_start".
574 struct Define_symbol_in_section
578 // The name of the output section with which this symbol should be
579 // associated. If there is no output section with that name, the
580 // symbol will be defined as zero.
581 const char* output_section;
582 // The offset of the symbol within the output section. This is an
583 // offset from the start of the output section, unless start_at_end
584 // is true, in which case this is an offset from the end of the
587 // The size of the symbol.
591 // The symbol binding.
593 // The symbol visibility.
594 elfcpp::STV visibility;
595 // The rest of the st_other field.
596 unsigned char nonvis;
597 // If true, the value field is an offset from the end of the output
599 bool offset_is_from_end;
600 // If true, this symbol is defined only if we see a reference to it.
604 // A struct describing a symbol defined by the linker, where the value
605 // of the symbol is defined based on a segment. This is used for
606 // symbols defined by the linker, like "_end". We describe the
607 // segment with which the symbol should be associated by its
608 // characteristics. If no segment meets these characteristics, the
609 // symbol will be defined as zero. If there is more than one segment
610 // which meets these characteristics, we will use the first one.
612 struct Define_symbol_in_segment
616 // The segment type where the symbol should be defined, typically
618 elfcpp::PT segment_type;
619 // Bitmask of segment flags which must be set.
620 elfcpp::PF segment_flags_set;
621 // Bitmask of segment flags which must be clear.
622 elfcpp::PF segment_flags_clear;
623 // The offset of the symbol within the segment. The offset is
624 // calculated from the position set by offset_base.
626 // The size of the symbol.
630 // The symbol binding.
632 // The symbol visibility.
633 elfcpp::STV visibility;
634 // The rest of the st_other field.
635 unsigned char nonvis;
636 // The base from which we compute the offset.
637 Symbol::Segment_offset_base offset_base;
638 // If true, this symbol is defined only if we see a reference to it.
642 // This class manages warnings. Warnings are a GNU extension. When
643 // we see a section named .gnu.warning.SYM in an object file, and if
644 // we wind using the definition of SYM from that object file, then we
645 // will issue a warning for any relocation against SYM from a
646 // different object file. The text of the warning is the contents of
647 // the section. This is not precisely the definition used by the old
648 // GNU linker; the old GNU linker treated an occurrence of
649 // .gnu.warning.SYM as defining a warning symbol. A warning symbol
650 // would trigger a warning on any reference. However, it was
651 // inconsistent in that a warning in a dynamic object only triggered
652 // if there was no definition in a regular object. This linker is
653 // different in that we only issue a warning if we use the symbol
654 // definition from the same object file as the warning section.
663 // Add a warning for symbol NAME in section SHNDX in object OBJ.
665 add_warning(Symbol_table* symtab, const char* name, Object* obj,
668 // For each symbol for which we should give a warning, make a note
671 note_warnings(Symbol_table* symtab);
673 // Issue a warning for a reference to SYM at LOCATION.
675 issue_warning(const Symbol* sym, const std::string& location) const;
678 Warnings(const Warnings&);
679 Warnings& operator=(const Warnings&);
681 // What we need to know to get the warning text.
682 struct Warning_location
684 // The object the warning is in.
686 // The index of the warning section.
688 // The warning text if we have already loaded it.
692 : object(NULL), shndx(0), text()
696 set(Object* o, unsigned int s)
703 set_text(const char* t, off_t l)
704 { this->text.assign(t, l); }
707 // A mapping from warning symbol names (canonicalized in
708 // Symbol_table's namepool_ field) to
709 typedef Unordered_map<const char*, Warning_location> Warning_table;
711 Warning_table warnings_;
714 // The main linker symbol table.
723 // Add COUNT external symbols from the relocatable object RELOBJ to
724 // the symbol table. SYMS is the symbols, SYM_NAMES is their names,
725 // SYM_NAME_SIZE is the size of SYM_NAMES. This sets SYMPOINTERS to
726 // point to the symbols in the symbol table.
727 template<int size, bool big_endian>
729 add_from_relobj(Sized_relobj<size, big_endian>* relobj,
730 const unsigned char* syms, size_t count,
731 const char* sym_names, size_t sym_name_size,
732 Symbol** sympointers);
734 // Add COUNT dynamic symbols from the dynamic object DYNOBJ to the
735 // symbol table. SYMS is the symbols. SYM_NAMES is their names.
736 // SYM_NAME_SIZE is the size of SYM_NAMES. The other parameters are
737 // symbol version data.
738 template<int size, bool big_endian>
740 add_from_dynobj(Sized_dynobj<size, big_endian>* dynobj,
741 const unsigned char* syms, size_t count,
742 const char* sym_names, size_t sym_name_size,
743 const unsigned char* versym, size_t versym_size,
744 const std::vector<const char*>*);
746 // Define a special symbol based on an Output_data. It is a
747 // multiple definition error if this symbol is already defined.
749 define_in_output_data(const Target*, const char* name, const char* version,
750 Output_data*, uint64_t value, uint64_t symsize,
751 elfcpp::STT type, elfcpp::STB binding,
752 elfcpp::STV visibility, unsigned char nonvis,
753 bool offset_is_from_end, bool only_if_ref);
755 // Define a special symbol based on an Output_segment. It is a
756 // multiple definition error if this symbol is already defined.
758 define_in_output_segment(const Target*, const char* name,
759 const char* version, Output_segment*,
760 uint64_t value, uint64_t symsize,
761 elfcpp::STT type, elfcpp::STB binding,
762 elfcpp::STV visibility, unsigned char nonvis,
763 Symbol::Segment_offset_base, bool only_if_ref);
765 // Define a special symbol with a constant value. It is a multiple
766 // definition error if this symbol is already defined.
768 define_as_constant(const Target*, const char* name, const char* version,
769 uint64_t value, uint64_t symsize, elfcpp::STT type,
770 elfcpp::STB binding, elfcpp::STV visibility,
771 unsigned char nonvis, bool only_if_ref);
773 // Define a set of symbols in output sections.
775 define_symbols(const Layout*, const Target*, int count,
776 const Define_symbol_in_section*);
778 // Define a set of symbols in output segments.
780 define_symbols(const Layout*, const Target*, int count,
781 const Define_symbol_in_segment*);
785 lookup(const char*, const char* version = NULL) const;
787 // Return the real symbol associated with the forwarder symbol FROM.
789 resolve_forwards(const Symbol* from) const;
791 // Return the bitsize (32 or 64) of the symbols in the table.
794 { return this->size_; }
796 // Return the sized version of a symbol in this table.
799 get_sized_symbol(Symbol* ACCEPT_SIZE) const;
802 const Sized_symbol<size>*
803 get_sized_symbol(const Symbol* ACCEPT_SIZE) const;
805 // Return the count of undefined symbols seen.
807 saw_undefined() const
808 { return this->saw_undefined_; }
810 // Allocate the common symbols
812 allocate_commons(const General_options&, Layout*);
814 // Add a warning for symbol NAME in section SHNDX in object OBJ.
816 add_warning(const char* name, Object* obj, unsigned int shndx)
817 { this->warnings_.add_warning(this, name, obj, shndx); }
819 // Canonicalize a symbol name for use in the hash table.
821 canonicalize_name(const char* name)
822 { return this->namepool_.add(name, NULL); }
824 // Possibly issue a warning for a reference to SYM at LOCATION which
827 issue_warning(const Symbol* sym, const std::string& location) const
828 { this->warnings_.issue_warning(sym, location); }
830 // Set the dynamic symbol indexes. INDEX is the index of the first
831 // global dynamic symbol. Pointers to the symbols are stored into
832 // the vector. The names are stored into the Stringpool. This
833 // returns an updated dynamic symbol index.
835 set_dynsym_indexes(const General_options*, const Target*, unsigned int index,
836 std::vector<Symbol*>*, Stringpool*, Versions*);
838 // Finalize the symbol table after we have set the final addresses
839 // of all the input sections. This sets the final symbol indexes,
840 // values and adds the names to *POOL. INDEX is the index of the
841 // first global symbol. OFF is the file offset of the global symbol
842 // table, DYNOFF is the offset of the globals in the dynamic symbol
843 // table, DYN_GLOBAL_INDEX is the index of the first global dynamic
844 // symbol, and DYNCOUNT is the number of global dynamic symbols.
845 // This records the parameters, and returns the new file offset.
847 finalize(unsigned int index, off_t off, off_t dynoff,
848 size_t dyn_global_index, size_t dyncount, Stringpool* pool);
850 // Write out the global symbols.
852 write_globals(const Target*, const Stringpool*, const Stringpool*,
855 // Write out a section symbol. Return the updated offset.
857 write_section_symbol(const Target*, const Output_section*, Output_file*,
861 Symbol_table(const Symbol_table&);
862 Symbol_table& operator=(const Symbol_table&);
864 // Set the size (32 or 64) of the symbols in the table.
867 { this->size_ = size; }
869 // Make FROM a forwarder symbol to TO.
871 make_forwarder(Symbol* from, Symbol* to);
874 template<int size, bool big_endian>
876 add_from_object(Object*, const char *name, Stringpool::Key name_key,
877 const char *version, Stringpool::Key version_key,
878 bool def, const elfcpp::Sym<size, big_endian>& sym);
881 template<int size, bool big_endian>
883 resolve(Sized_symbol<size>* to,
884 const elfcpp::Sym<size, big_endian>& sym,
885 Object*, const char* version);
887 template<int size, bool big_endian>
889 resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from,
890 const char* version ACCEPT_SIZE_ENDIAN);
892 // Define a special symbol.
893 template<int size, bool big_endian>
895 define_special_symbol(const Target* target, const char* name,
896 const char* version, bool only_if_ref
899 // Define a symbol in an Output_data, sized version.
902 do_define_in_output_data(const Target*, const char* name,
903 const char* version, Output_data*,
904 typename elfcpp::Elf_types<size>::Elf_Addr value,
905 typename elfcpp::Elf_types<size>::Elf_WXword ssize,
906 elfcpp::STT type, elfcpp::STB binding,
907 elfcpp::STV visibility, unsigned char nonvis,
908 bool offset_is_from_end, bool only_if_ref);
910 // Define a symbol in an Output_segment, sized version.
913 do_define_in_output_segment(
914 const Target*, const char* name, const char* version, Output_segment* os,
915 typename elfcpp::Elf_types<size>::Elf_Addr value,
916 typename elfcpp::Elf_types<size>::Elf_WXword ssize,
917 elfcpp::STT type, elfcpp::STB binding,
918 elfcpp::STV visibility, unsigned char nonvis,
919 Symbol::Segment_offset_base offset_base, bool only_if_ref);
921 // Define a symbol as a constant, sized version.
924 do_define_as_constant(
925 const Target*, const char* name, const char* version,
926 typename elfcpp::Elf_types<size>::Elf_Addr value,
927 typename elfcpp::Elf_types<size>::Elf_WXword ssize,
928 elfcpp::STT type, elfcpp::STB binding,
929 elfcpp::STV visibility, unsigned char nonvis,
932 // Allocate the common symbols, sized version.
935 do_allocate_commons(const General_options&, Layout*);
937 // Finalize symbols specialized for size.
940 sized_finalize(unsigned int, off_t, Stringpool*);
942 // Write globals specialized for size and endianness.
943 template<int size, bool big_endian>
945 sized_write_globals(const Target*, const Stringpool*, const Stringpool*,
948 // Write out a symbol to P.
949 template<int size, bool big_endian>
951 sized_write_symbol(Sized_symbol<size>*, unsigned int shndx,
952 const Stringpool*, unsigned char* p
953 ACCEPT_SIZE_ENDIAN) const;
955 // Write out a section symbol, specialized for size and endianness.
956 template<int size, bool big_endian>
958 sized_write_section_symbol(const Output_section*, Output_file*, off_t) const;
960 // The type of the symbol hash table.
962 typedef std::pair<Stringpool::Key, Stringpool::Key> Symbol_table_key;
964 struct Symbol_table_hash
967 operator()(const Symbol_table_key&) const;
970 struct Symbol_table_eq
973 operator()(const Symbol_table_key&, const Symbol_table_key&) const;
976 typedef Unordered_map<Symbol_table_key, Symbol*, Symbol_table_hash,
977 Symbol_table_eq> Symbol_table_type;
979 // The type of the list of common symbols.
981 typedef std::vector<Symbol*> Commons_type;
983 // The size of the symbols in the symbol table (32 or 64).
986 // We increment this every time we see a new undefined symbol, for
987 // use in archive groups.
990 // The index of the first global symbol in the output file.
991 unsigned int first_global_index_;
993 // The file offset within the output symtab section where we should
997 // The number of global symbols we want to write out.
998 size_t output_count_;
1000 // The file offset of the global dynamic symbols, or 0 if none.
1001 off_t dynamic_offset_;
1003 // The index of the first global dynamic symbol.
1004 unsigned int first_dynamic_global_index_;
1006 // The number of global dynamic symbols, or 0 if none.
1007 off_t dynamic_count_;
1009 // The symbol hash table.
1010 Symbol_table_type table_;
1012 // A pool of symbol names. This is used for all global symbols.
1013 // Entries in the hash table point into this pool.
1014 Stringpool namepool_;
1016 // Forwarding symbols.
1017 Unordered_map<const Symbol*, Symbol*> forwarders_;
1019 // We don't expect there to be very many common symbols, so we keep
1020 // a list of them. When we find a common symbol we add it to this
1021 // list. It is possible that by the time we process the list the
1022 // symbol is no longer a common symbol. It may also have become a
1024 Commons_type commons_;
1026 // Manage symbol warnings.
1030 // We inline get_sized_symbol for efficiency.
1034 Symbol_table::get_sized_symbol(Symbol* sym ACCEPT_SIZE) const
1036 gold_assert(size == this->get_size());
1037 return static_cast<Sized_symbol<size>*>(sym);
1041 const Sized_symbol<size>*
1042 Symbol_table::get_sized_symbol(const Symbol* sym ACCEPT_SIZE) const
1044 gold_assert(size == this->get_size());
1045 return static_cast<const Sized_symbol<size>*>(sym);
1048 } // End namespace gold.
1050 #endif // !defined(GOLD_SYMTAB_H)