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 // Return whether this symbol has been seen in a dynamic object.
201 { return this->in_dyn_; }
203 // Mark this symbol as having been seen in a dynamic object.
206 { this->in_dyn_ = true; }
208 // Return the index of this symbol in the output file symbol table.
209 // A value of -1U means that this symbol is not going into the
210 // output file. This starts out as zero, and is set to a non-zero
211 // value by Symbol_table::finalize. It is an error to ask for the
212 // symbol table index before it has been set.
216 gold_assert(this->symtab_index_ != 0);
217 return this->symtab_index_;
220 // Set the index of the symbol in the output file symbol table.
222 set_symtab_index(unsigned int index)
224 gold_assert(index != 0);
225 this->symtab_index_ = index;
228 // Return whether this symbol already has an index in the output
229 // file symbol table.
231 has_symtab_index() const
232 { return this->symtab_index_ != 0; }
234 // Return the index of this symbol in the dynamic symbol table. A
235 // value of -1U means that this symbol is not going into the dynamic
236 // symbol table. This starts out as zero, and is set to a non-zero
237 // during Layout::finalize. It is an error to ask for the dynamic
238 // symbol table index before it has been set.
242 gold_assert(this->dynsym_index_ != 0);
243 return this->dynsym_index_;
246 // Set the index of the symbol in the dynamic symbol table.
248 set_dynsym_index(unsigned int index)
250 gold_assert(index != 0);
251 this->dynsym_index_ = index;
254 // Return whether this symbol already has an index in the dynamic
257 has_dynsym_index() const
258 { return this->dynsym_index_ != 0; }
260 // Return whether this symbol has an entry in the GOT section.
262 has_got_offset() const
263 { return this->has_got_offset_; }
265 // Return the offset into the GOT section of this symbol.
269 gold_assert(this->has_got_offset());
270 return this->got_offset_;
273 // Set the GOT offset of this symbol.
275 set_got_offset(unsigned int got_offset)
277 this->has_got_offset_ = true;
278 this->got_offset_ = got_offset;
281 // Return whether this symbol has an entry in the PLT section.
283 has_plt_offset() const
284 { return this->has_plt_offset_; }
286 // Return the offset into the PLT section of this symbol.
290 gold_assert(this->has_plt_offset());
291 return this->plt_offset_;
294 // Set the PLT offset of this symbol.
296 set_plt_offset(unsigned int plt_offset)
298 this->has_plt_offset_ = true;
299 this->plt_offset_ = plt_offset;
302 // Return true if the final value of this symbol is known at link
305 final_value_is_known(const General_options* options) const
307 if (options->is_shared())
309 return this->source_ != FROM_OBJECT || !this->object()->is_dynamic();
312 // Return whether this is a defined symbol (not undefined or
317 return (this->source_ != FROM_OBJECT
318 || (this->shndx() != elfcpp::SHN_UNDEF
319 && this->shndx() != elfcpp::SHN_COMMON));
322 // Return true if this symbol is from a dynamic object.
324 is_from_dynobj() const
326 return this->source_ == FROM_OBJECT && this->object()->is_dynamic();
329 // Return whether this is an undefined symbol.
333 return this->source_ == FROM_OBJECT && this->shndx() == elfcpp::SHN_UNDEF;
336 // Return whether this is a common symbol.
340 return (this->source_ == FROM_OBJECT
341 && (this->shndx() == elfcpp::SHN_COMMON
342 || this->type_ == elfcpp::STT_COMMON));
345 // Return whether this symbol can be seen outside this object.
347 is_externally_visible() const
349 return (this->visibility_ == elfcpp::STV_DEFAULT
350 || this->visibility_ == elfcpp::STV_PROTECTED);
353 // Return whether there should be a warning for references to this
357 { return this->has_warning_; }
359 // Mark this symbol as having a warning.
362 { this->has_warning_ = true; }
365 // Instances of this class should always be created at a specific
368 { memset(this, 0, sizeof *this); }
370 // Initialize the general fields.
372 init_fields(const char* name, const char* version,
373 elfcpp::STT type, elfcpp::STB binding,
374 elfcpp::STV visibility, unsigned char nonvis);
376 // Initialize fields from an ELF symbol in OBJECT.
377 template<int size, bool big_endian>
379 init_base(const char *name, const char* version, Object* object,
380 const elfcpp::Sym<size, big_endian>&);
382 // Initialize fields for an Output_data.
384 init_base(const char* name, Output_data*, elfcpp::STT, elfcpp::STB,
385 elfcpp::STV, unsigned char nonvis, bool offset_is_from_end);
387 // Initialize fields for an Output_segment.
389 init_base(const char* name, Output_segment* os, elfcpp::STT type,
390 elfcpp::STB binding, elfcpp::STV visibility,
391 unsigned char nonvis, Segment_offset_base offset_base);
393 // Initialize fields for a constant.
395 init_base(const char* name, elfcpp::STT type, elfcpp::STB binding,
396 elfcpp::STV visibility, unsigned char nonvis);
398 // Override existing symbol.
399 template<int size, bool big_endian>
401 override_base(const elfcpp::Sym<size, big_endian>&, Object* object,
402 const char* version);
405 Symbol(const Symbol&);
406 Symbol& operator=(const Symbol&);
408 // Symbol name (expected to point into a Stringpool).
410 // Symbol version (expected to point into a Stringpool). This may
412 const char* version_;
416 // This struct is used if SOURCE_ == FROM_OBJECT.
419 // Object in which symbol is defined, or in which it was first
422 // Section number in object_ in which symbol is defined.
426 // This struct is used if SOURCE_ == IN_OUTPUT_DATA.
429 // Output_data in which symbol is defined. Before
430 // Layout::finalize the symbol's value is an offset within the
432 Output_data* output_data;
433 // True if the offset is from the end, false if the offset is
434 // from the beginning.
435 bool offset_is_from_end;
438 // This struct is used if SOURCE_ == IN_OUTPUT_SEGMENT.
441 // Output_segment in which the symbol is defined. Before
442 // Layout::finalize the symbol's value is an offset.
443 Output_segment* output_segment;
444 // The base to use for the offset before Layout::finalize.
445 Segment_offset_base offset_base;
449 // The index of this symbol in the output file. If the symbol is
450 // not going into the output file, this value is -1U. This field
451 // starts as always holding zero. It is set to a non-zero value by
452 // Symbol_table::finalize.
453 unsigned int symtab_index_;
455 // The index of this symbol in the dynamic symbol table. If the
456 // symbol is not going into the dynamic symbol table, this value is
457 // -1U. This field starts as always holding zero. It is set to a
458 // non-zero value during Layout::finalize.
459 unsigned int dynsym_index_;
461 // If this symbol has an entry in the GOT section (has_got_offset_
462 // is true), this is the offset from the start of the GOT section.
463 unsigned int got_offset_;
465 // If this symbol has an entry in the PLT section (has_plt_offset_
466 // is true), then this is the offset from the start of the PLT
468 unsigned int plt_offset_;
471 elfcpp::STT type_ : 4;
473 elfcpp::STB binding_ : 4;
474 // Symbol visibility.
475 elfcpp::STV visibility_ : 2;
476 // Rest of symbol st_other field.
477 unsigned int nonvis_ : 6;
478 // The type of symbol.
480 // True if this symbol always requires special target-specific
482 bool is_target_special_ : 1;
483 // True if this is the default version of the symbol.
485 // True if this symbol really forwards to another symbol. This is
486 // used when we discover after the fact that two different entries
487 // in the hash table really refer to the same symbol. This will
488 // never be set for a symbol found in the hash table, but may be set
489 // for a symbol found in the list of symbols attached to an Object.
490 // It forwards to the symbol found in the forwarders_ map of
492 bool is_forwarder_ : 1;
493 // True if this symbol needs to be in the dynamic symbol table.
494 bool needs_dynsym_entry_ : 1;
495 // True if we've seen this symbol in a regular object.
497 // True if we've seen this symbol in a dynamic object.
499 // True if the symbol has an entry in the GOT section.
500 bool has_got_offset_ : 1;
501 // True if the symbol has an entry in the PLT section.
502 bool has_plt_offset_ : 1;
503 // True if there is a warning for this symbol.
504 bool has_warning_ : 1;
507 // The parts of a symbol which are size specific. Using a template
508 // derived class like this helps us use less space on a 32-bit system.
511 class Sized_symbol : public Symbol
514 typedef typename elfcpp::Elf_types<size>::Elf_Addr Value_type;
515 typedef typename elfcpp::Elf_types<size>::Elf_WXword Size_type;
520 // Initialize fields from an ELF symbol in OBJECT.
521 template<bool big_endian>
523 init(const char *name, const char* version, Object* object,
524 const elfcpp::Sym<size, big_endian>&);
526 // Initialize fields for an Output_data.
528 init(const char* name, Output_data*, Value_type value, Size_type symsize,
529 elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis,
530 bool offset_is_from_end);
532 // Initialize fields for an Output_segment.
534 init(const char* name, Output_segment*, Value_type value, Size_type symsize,
535 elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis,
536 Segment_offset_base offset_base);
538 // Initialize fields for a constant.
540 init(const char* name, Value_type value, Size_type symsize,
541 elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis);
543 // Override existing symbol.
544 template<bool big_endian>
546 override(const elfcpp::Sym<size, big_endian>&, Object* object,
547 const char* version);
549 // Return the symbol's value.
552 { return this->value_; }
554 // Return the symbol's size (we can't call this 'size' because that
555 // is a template parameter).
558 { return this->symsize_; }
560 // Set the symbol size. This is used when resolving common symbols.
562 set_symsize(Size_type symsize)
563 { this->symsize_ = symsize; }
565 // Set the symbol value. This is called when we store the final
566 // values of the symbols into the symbol table.
568 set_value(Value_type value)
569 { this->value_ = value; }
572 Sized_symbol(const Sized_symbol&);
573 Sized_symbol& operator=(const Sized_symbol&);
575 // Symbol value. Before Layout::finalize this is the offset in the
576 // input section. This is set to the final value during
583 // A struct describing a symbol defined by the linker, where the value
584 // of the symbol is defined based on an output section. This is used
585 // for symbols defined by the linker, like "_init_array_start".
587 struct Define_symbol_in_section
591 // The name of the output section with which this symbol should be
592 // associated. If there is no output section with that name, the
593 // symbol will be defined as zero.
594 const char* output_section;
595 // The offset of the symbol within the output section. This is an
596 // offset from the start of the output section, unless start_at_end
597 // is true, in which case this is an offset from the end of the
600 // The size of the symbol.
604 // The symbol binding.
606 // The symbol visibility.
607 elfcpp::STV visibility;
608 // The rest of the st_other field.
609 unsigned char nonvis;
610 // If true, the value field is an offset from the end of the output
612 bool offset_is_from_end;
613 // If true, this symbol is defined only if we see a reference to it.
617 // A struct describing a symbol defined by the linker, where the value
618 // of the symbol is defined based on a segment. This is used for
619 // symbols defined by the linker, like "_end". We describe the
620 // segment with which the symbol should be associated by its
621 // characteristics. If no segment meets these characteristics, the
622 // symbol will be defined as zero. If there is more than one segment
623 // which meets these characteristics, we will use the first one.
625 struct Define_symbol_in_segment
629 // The segment type where the symbol should be defined, typically
631 elfcpp::PT segment_type;
632 // Bitmask of segment flags which must be set.
633 elfcpp::PF segment_flags_set;
634 // Bitmask of segment flags which must be clear.
635 elfcpp::PF segment_flags_clear;
636 // The offset of the symbol within the segment. The offset is
637 // calculated from the position set by offset_base.
639 // The size of the symbol.
643 // The symbol binding.
645 // The symbol visibility.
646 elfcpp::STV visibility;
647 // The rest of the st_other field.
648 unsigned char nonvis;
649 // The base from which we compute the offset.
650 Symbol::Segment_offset_base offset_base;
651 // If true, this symbol is defined only if we see a reference to it.
655 // This class manages warnings. Warnings are a GNU extension. When
656 // we see a section named .gnu.warning.SYM in an object file, and if
657 // we wind using the definition of SYM from that object file, then we
658 // will issue a warning for any relocation against SYM from a
659 // different object file. The text of the warning is the contents of
660 // the section. This is not precisely the definition used by the old
661 // GNU linker; the old GNU linker treated an occurrence of
662 // .gnu.warning.SYM as defining a warning symbol. A warning symbol
663 // would trigger a warning on any reference. However, it was
664 // inconsistent in that a warning in a dynamic object only triggered
665 // if there was no definition in a regular object. This linker is
666 // different in that we only issue a warning if we use the symbol
667 // definition from the same object file as the warning section.
676 // Add a warning for symbol NAME in section SHNDX in object OBJ.
678 add_warning(Symbol_table* symtab, const char* name, Object* obj,
681 // For each symbol for which we should give a warning, make a note
684 note_warnings(Symbol_table* symtab);
686 // Issue a warning for a reference to SYM at LOCATION.
688 issue_warning(const Symbol* sym, const std::string& location) const;
691 Warnings(const Warnings&);
692 Warnings& operator=(const Warnings&);
694 // What we need to know to get the warning text.
695 struct Warning_location
697 // The object the warning is in.
699 // The index of the warning section.
701 // The warning text if we have already loaded it.
705 : object(NULL), shndx(0), text()
709 set(Object* o, unsigned int s)
716 set_text(const char* t, off_t l)
717 { this->text.assign(t, l); }
720 // A mapping from warning symbol names (canonicalized in
721 // Symbol_table's namepool_ field) to
722 typedef Unordered_map<const char*, Warning_location> Warning_table;
724 Warning_table warnings_;
727 // The main linker symbol table.
736 // Add COUNT external symbols from the relocatable object RELOBJ to
737 // the symbol table. SYMS is the symbols, SYM_NAMES is their names,
738 // SYM_NAME_SIZE is the size of SYM_NAMES. This sets SYMPOINTERS to
739 // point to the symbols in the symbol table.
740 template<int size, bool big_endian>
742 add_from_relobj(Sized_relobj<size, big_endian>* relobj,
743 const unsigned char* syms, size_t count,
744 const char* sym_names, size_t sym_name_size,
745 Symbol** sympointers);
747 // Add COUNT dynamic symbols from the dynamic object DYNOBJ to the
748 // symbol table. SYMS is the symbols. SYM_NAMES is their names.
749 // SYM_NAME_SIZE is the size of SYM_NAMES. The other parameters are
750 // symbol version data.
751 template<int size, bool big_endian>
753 add_from_dynobj(Sized_dynobj<size, big_endian>* dynobj,
754 const unsigned char* syms, size_t count,
755 const char* sym_names, size_t sym_name_size,
756 const unsigned char* versym, size_t versym_size,
757 const std::vector<const char*>*);
759 // Define a special symbol based on an Output_data. It is a
760 // multiple definition error if this symbol is already defined.
762 define_in_output_data(const Target*, const char* name, const char* version,
763 Output_data*, uint64_t value, uint64_t symsize,
764 elfcpp::STT type, elfcpp::STB binding,
765 elfcpp::STV visibility, unsigned char nonvis,
766 bool offset_is_from_end, bool only_if_ref);
768 // Define a special symbol based on an Output_segment. It is a
769 // multiple definition error if this symbol is already defined.
771 define_in_output_segment(const Target*, const char* name,
772 const char* version, Output_segment*,
773 uint64_t value, uint64_t symsize,
774 elfcpp::STT type, elfcpp::STB binding,
775 elfcpp::STV visibility, unsigned char nonvis,
776 Symbol::Segment_offset_base, bool only_if_ref);
778 // Define a special symbol with a constant value. It is a multiple
779 // definition error if this symbol is already defined.
781 define_as_constant(const Target*, const char* name, const char* version,
782 uint64_t value, uint64_t symsize, elfcpp::STT type,
783 elfcpp::STB binding, elfcpp::STV visibility,
784 unsigned char nonvis, bool only_if_ref);
786 // Define a set of symbols in output sections.
788 define_symbols(const Layout*, const Target*, int count,
789 const Define_symbol_in_section*);
791 // Define a set of symbols in output segments.
793 define_symbols(const Layout*, const Target*, int count,
794 const Define_symbol_in_segment*);
798 lookup(const char*, const char* version = NULL) const;
800 // Return the real symbol associated with the forwarder symbol FROM.
802 resolve_forwards(const Symbol* from) const;
804 // Return the bitsize (32 or 64) of the symbols in the table.
807 { return this->size_; }
809 // Return the sized version of a symbol in this table.
812 get_sized_symbol(Symbol* ACCEPT_SIZE) const;
815 const Sized_symbol<size>*
816 get_sized_symbol(const Symbol* ACCEPT_SIZE) const;
818 // Return the count of undefined symbols seen.
820 saw_undefined() const
821 { return this->saw_undefined_; }
823 // Allocate the common symbols
825 allocate_commons(const General_options&, Layout*);
827 // Add a warning for symbol NAME in section SHNDX in object OBJ.
829 add_warning(const char* name, Object* obj, unsigned int shndx)
830 { this->warnings_.add_warning(this, name, obj, shndx); }
832 // Canonicalize a symbol name for use in the hash table.
834 canonicalize_name(const char* name)
835 { return this->namepool_.add(name, NULL); }
837 // Possibly issue a warning for a reference to SYM at LOCATION which
840 issue_warning(const Symbol* sym, const std::string& location) const
841 { this->warnings_.issue_warning(sym, location); }
843 // Set the dynamic symbol indexes. INDEX is the index of the first
844 // global dynamic symbol. Pointers to the symbols are stored into
845 // the vector. The names are stored into the Stringpool. This
846 // returns an updated dynamic symbol index.
848 set_dynsym_indexes(const General_options*, const Target*, unsigned int index,
849 std::vector<Symbol*>*, Stringpool*, Versions*);
851 // Finalize the symbol table after we have set the final addresses
852 // of all the input sections. This sets the final symbol indexes,
853 // values and adds the names to *POOL. INDEX is the index of the
854 // first global symbol. OFF is the file offset of the global symbol
855 // table, DYNOFF is the offset of the globals in the dynamic symbol
856 // table, DYN_GLOBAL_INDEX is the index of the first global dynamic
857 // symbol, and DYNCOUNT is the number of global dynamic symbols.
858 // This records the parameters, and returns the new file offset.
860 finalize(unsigned int index, off_t off, off_t dynoff,
861 size_t dyn_global_index, size_t dyncount, Stringpool* pool);
863 // Write out the global symbols.
865 write_globals(const Target*, const Stringpool*, const Stringpool*,
868 // Write out a section symbol. Return the updated offset.
870 write_section_symbol(const Target*, const Output_section*, Output_file*,
874 Symbol_table(const Symbol_table&);
875 Symbol_table& operator=(const Symbol_table&);
877 // Set the size (32 or 64) of the symbols in the table.
880 { this->size_ = size; }
882 // Make FROM a forwarder symbol to TO.
884 make_forwarder(Symbol* from, Symbol* to);
887 template<int size, bool big_endian>
889 add_from_object(Object*, const char *name, Stringpool::Key name_key,
890 const char *version, Stringpool::Key version_key,
891 bool def, const elfcpp::Sym<size, big_endian>& sym);
894 template<int size, bool big_endian>
896 resolve(Sized_symbol<size>* to,
897 const elfcpp::Sym<size, big_endian>& sym,
898 Object*, const char* version);
900 template<int size, bool big_endian>
902 resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from,
903 const char* version ACCEPT_SIZE_ENDIAN);
905 // Define a special symbol.
906 template<int size, bool big_endian>
908 define_special_symbol(const Target* target, const char* name,
909 const char* version, bool only_if_ref
912 // Define a symbol in an Output_data, sized version.
915 do_define_in_output_data(const Target*, const char* name,
916 const char* version, Output_data*,
917 typename elfcpp::Elf_types<size>::Elf_Addr value,
918 typename elfcpp::Elf_types<size>::Elf_WXword ssize,
919 elfcpp::STT type, elfcpp::STB binding,
920 elfcpp::STV visibility, unsigned char nonvis,
921 bool offset_is_from_end, bool only_if_ref);
923 // Define a symbol in an Output_segment, sized version.
926 do_define_in_output_segment(
927 const Target*, const char* name, const char* version, Output_segment* os,
928 typename elfcpp::Elf_types<size>::Elf_Addr value,
929 typename elfcpp::Elf_types<size>::Elf_WXword ssize,
930 elfcpp::STT type, elfcpp::STB binding,
931 elfcpp::STV visibility, unsigned char nonvis,
932 Symbol::Segment_offset_base offset_base, bool only_if_ref);
934 // Define a symbol as a constant, sized version.
937 do_define_as_constant(
938 const Target*, const char* name, const char* version,
939 typename elfcpp::Elf_types<size>::Elf_Addr value,
940 typename elfcpp::Elf_types<size>::Elf_WXword ssize,
941 elfcpp::STT type, elfcpp::STB binding,
942 elfcpp::STV visibility, unsigned char nonvis,
945 // Allocate the common symbols, sized version.
948 do_allocate_commons(const General_options&, Layout*);
950 // Finalize symbols specialized for size.
953 sized_finalize(unsigned int, off_t, Stringpool*);
955 // Write globals specialized for size and endianness.
956 template<int size, bool big_endian>
958 sized_write_globals(const Target*, const Stringpool*, const Stringpool*,
961 // Write out a symbol to P.
962 template<int size, bool big_endian>
964 sized_write_symbol(Sized_symbol<size>*, unsigned int shndx,
965 const Stringpool*, unsigned char* p
966 ACCEPT_SIZE_ENDIAN) const;
968 // Write out a section symbol, specialized for size and endianness.
969 template<int size, bool big_endian>
971 sized_write_section_symbol(const Output_section*, Output_file*, off_t) const;
973 // The type of the symbol hash table.
975 typedef std::pair<Stringpool::Key, Stringpool::Key> Symbol_table_key;
977 struct Symbol_table_hash
980 operator()(const Symbol_table_key&) const;
983 struct Symbol_table_eq
986 operator()(const Symbol_table_key&, const Symbol_table_key&) const;
989 typedef Unordered_map<Symbol_table_key, Symbol*, Symbol_table_hash,
990 Symbol_table_eq> Symbol_table_type;
992 // The type of the list of common symbols.
994 typedef std::vector<Symbol*> Commons_type;
996 // The size of the symbols in the symbol table (32 or 64).
999 // We increment this every time we see a new undefined symbol, for
1000 // use in archive groups.
1003 // The index of the first global symbol in the output file.
1004 unsigned int first_global_index_;
1006 // The file offset within the output symtab section where we should
1010 // The number of global symbols we want to write out.
1011 size_t output_count_;
1013 // The file offset of the global dynamic symbols, or 0 if none.
1014 off_t dynamic_offset_;
1016 // The index of the first global dynamic symbol.
1017 unsigned int first_dynamic_global_index_;
1019 // The number of global dynamic symbols, or 0 if none.
1020 off_t dynamic_count_;
1022 // The symbol hash table.
1023 Symbol_table_type table_;
1025 // A pool of symbol names. This is used for all global symbols.
1026 // Entries in the hash table point into this pool.
1027 Stringpool namepool_;
1029 // Forwarding symbols.
1030 Unordered_map<const Symbol*, Symbol*> forwarders_;
1032 // We don't expect there to be very many common symbols, so we keep
1033 // a list of them. When we find a common symbol we add it to this
1034 // list. It is possible that by the time we process the list the
1035 // symbol is no longer a common symbol. It may also have become a
1037 Commons_type commons_;
1039 // Manage symbol warnings.
1043 // We inline get_sized_symbol for efficiency.
1047 Symbol_table::get_sized_symbol(Symbol* sym ACCEPT_SIZE) const
1049 gold_assert(size == this->get_size());
1050 return static_cast<Sized_symbol<size>*>(sym);
1054 const Sized_symbol<size>*
1055 Symbol_table::get_sized_symbol(const Symbol* sym ACCEPT_SIZE) const
1057 gold_assert(size == this->get_size());
1058 return static_cast<const Sized_symbol<size>*>(sym);
1061 } // End namespace gold.
1063 #endif // !defined(GOLD_SYMTAB_H)