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
182 return (this->needs_dynsym_entry_
183 || (this->in_reg() && this->in_dyn()));
186 // Mark this symbol as needing an entry in the dynamic symbol table.
188 set_needs_dynsym_entry()
189 { this->needs_dynsym_entry_ = true; }
191 // Return whether this symbol has been seen in a regular object.
194 { return this->in_reg_; }
196 // Mark this symbol as having been seen in a regular object.
199 { this->in_reg_ = true; }
201 // Return whether this symbol has been seen in a dynamic object.
204 { return this->in_dyn_; }
206 // Mark this symbol as having been seen in a dynamic object.
209 { this->in_dyn_ = true; }
211 // Return the index of this symbol in the output file symbol table.
212 // A value of -1U means that this symbol is not going into the
213 // output file. This starts out as zero, and is set to a non-zero
214 // value by Symbol_table::finalize. It is an error to ask for the
215 // symbol table index before it has been set.
219 gold_assert(this->symtab_index_ != 0);
220 return this->symtab_index_;
223 // Set the index of the symbol in the output file symbol table.
225 set_symtab_index(unsigned int index)
227 gold_assert(index != 0);
228 this->symtab_index_ = index;
231 // Return whether this symbol already has an index in the output
232 // file symbol table.
234 has_symtab_index() const
235 { return this->symtab_index_ != 0; }
237 // Return the index of this symbol in the dynamic symbol table. A
238 // value of -1U means that this symbol is not going into the dynamic
239 // symbol table. This starts out as zero, and is set to a non-zero
240 // during Layout::finalize. It is an error to ask for the dynamic
241 // symbol table index before it has been set.
245 gold_assert(this->dynsym_index_ != 0);
246 return this->dynsym_index_;
249 // Set the index of the symbol in the dynamic symbol table.
251 set_dynsym_index(unsigned int index)
253 gold_assert(index != 0);
254 this->dynsym_index_ = index;
257 // Return whether this symbol already has an index in the dynamic
260 has_dynsym_index() const
261 { return this->dynsym_index_ != 0; }
263 // Return whether this symbol has an entry in the GOT section.
265 has_got_offset() const
266 { return this->has_got_offset_; }
268 // Return the offset into the GOT section of this symbol.
272 gold_assert(this->has_got_offset());
273 return this->got_offset_;
276 // Set the GOT offset of this symbol.
278 set_got_offset(unsigned int got_offset)
280 this->has_got_offset_ = true;
281 this->got_offset_ = got_offset;
284 // Return whether this symbol has an entry in the PLT section.
286 has_plt_offset() const
287 { return this->has_plt_offset_; }
289 // Return the offset into the PLT section of this symbol.
293 gold_assert(this->has_plt_offset());
294 return this->plt_offset_;
297 // Set the PLT offset of this symbol.
299 set_plt_offset(unsigned int plt_offset)
301 this->has_plt_offset_ = true;
302 this->plt_offset_ = plt_offset;
305 // Return true if the final value of this symbol is known at link
308 final_value_is_known(const General_options* options) const
310 if (options->is_shared())
312 return this->source_ != FROM_OBJECT || !this->object()->is_dynamic();
315 // Return whether this is a defined symbol (not undefined or
320 return (this->source_ != FROM_OBJECT
321 || (this->shndx() != elfcpp::SHN_UNDEF
322 && this->shndx() != elfcpp::SHN_COMMON));
325 // Return true if this symbol is from a dynamic object.
327 is_from_dynobj() const
329 return this->source_ == FROM_OBJECT && this->object()->is_dynamic();
332 // Return whether this is an undefined symbol.
336 return this->source_ == FROM_OBJECT && this->shndx() == elfcpp::SHN_UNDEF;
339 // Return whether this is a common symbol.
343 return (this->source_ == FROM_OBJECT
344 && (this->shndx() == elfcpp::SHN_COMMON
345 || this->type_ == elfcpp::STT_COMMON));
348 // Return whether this symbol can be seen outside this object.
350 is_externally_visible() const
352 return (this->visibility_ == elfcpp::STV_DEFAULT
353 || this->visibility_ == elfcpp::STV_PROTECTED);
356 // Return whether there should be a warning for references to this
360 { return this->has_warning_; }
362 // Mark this symbol as having a warning.
365 { this->has_warning_ = true; }
368 // Instances of this class should always be created at a specific
371 { memset(this, 0, sizeof *this); }
373 // Initialize the general fields.
375 init_fields(const char* name, const char* version,
376 elfcpp::STT type, elfcpp::STB binding,
377 elfcpp::STV visibility, unsigned char nonvis);
379 // Initialize fields from an ELF symbol in OBJECT.
380 template<int size, bool big_endian>
382 init_base(const char *name, const char* version, Object* object,
383 const elfcpp::Sym<size, big_endian>&);
385 // Initialize fields for an Output_data.
387 init_base(const char* name, Output_data*, elfcpp::STT, elfcpp::STB,
388 elfcpp::STV, unsigned char nonvis, bool offset_is_from_end);
390 // Initialize fields for an Output_segment.
392 init_base(const char* name, Output_segment* os, elfcpp::STT type,
393 elfcpp::STB binding, elfcpp::STV visibility,
394 unsigned char nonvis, Segment_offset_base offset_base);
396 // Initialize fields for a constant.
398 init_base(const char* name, elfcpp::STT type, elfcpp::STB binding,
399 elfcpp::STV visibility, unsigned char nonvis);
401 // Override existing symbol.
402 template<int size, bool big_endian>
404 override_base(const elfcpp::Sym<size, big_endian>&, Object* object,
405 const char* version);
407 // Override existing symbol with a special symbol.
409 override_base_with_special(const Symbol* from);
412 Symbol(const Symbol&);
413 Symbol& operator=(const Symbol&);
415 // Symbol name (expected to point into a Stringpool).
417 // Symbol version (expected to point into a Stringpool). This may
419 const char* version_;
423 // This struct is used if SOURCE_ == FROM_OBJECT.
426 // Object in which symbol is defined, or in which it was first
429 // Section number in object_ in which symbol is defined.
433 // This struct is used if SOURCE_ == IN_OUTPUT_DATA.
436 // Output_data in which symbol is defined. Before
437 // Layout::finalize the symbol's value is an offset within the
439 Output_data* output_data;
440 // True if the offset is from the end, false if the offset is
441 // from the beginning.
442 bool offset_is_from_end;
445 // This struct is used if SOURCE_ == IN_OUTPUT_SEGMENT.
448 // Output_segment in which the symbol is defined. Before
449 // Layout::finalize the symbol's value is an offset.
450 Output_segment* output_segment;
451 // The base to use for the offset before Layout::finalize.
452 Segment_offset_base offset_base;
456 // The index of this symbol in the output file. If the symbol is
457 // not going into the output file, this value is -1U. This field
458 // starts as always holding zero. It is set to a non-zero value by
459 // Symbol_table::finalize.
460 unsigned int symtab_index_;
462 // The index of this symbol in the dynamic symbol table. If the
463 // symbol is not going into the dynamic symbol table, this value is
464 // -1U. This field starts as always holding zero. It is set to a
465 // non-zero value during Layout::finalize.
466 unsigned int dynsym_index_;
468 // If this symbol has an entry in the GOT section (has_got_offset_
469 // is true), this is the offset from the start of the GOT section.
470 unsigned int got_offset_;
472 // If this symbol has an entry in the PLT section (has_plt_offset_
473 // is true), then this is the offset from the start of the PLT
475 unsigned int plt_offset_;
478 elfcpp::STT type_ : 4;
480 elfcpp::STB binding_ : 4;
481 // Symbol visibility.
482 elfcpp::STV visibility_ : 2;
483 // Rest of symbol st_other field.
484 unsigned int nonvis_ : 6;
485 // The type of symbol.
487 // True if this symbol always requires special target-specific
489 bool is_target_special_ : 1;
490 // True if this is the default version of the symbol.
492 // True if this symbol really forwards to another symbol. This is
493 // used when we discover after the fact that two different entries
494 // in the hash table really refer to the same symbol. This will
495 // never be set for a symbol found in the hash table, but may be set
496 // for a symbol found in the list of symbols attached to an Object.
497 // It forwards to the symbol found in the forwarders_ map of
499 bool is_forwarder_ : 1;
500 // True if this symbol needs to be in the dynamic symbol table.
501 bool needs_dynsym_entry_ : 1;
502 // True if we've seen this symbol in a regular object.
504 // True if we've seen this symbol in a dynamic object.
506 // True if the symbol has an entry in the GOT section.
507 bool has_got_offset_ : 1;
508 // True if the symbol has an entry in the PLT section.
509 bool has_plt_offset_ : 1;
510 // True if there is a warning for this symbol.
511 bool has_warning_ : 1;
514 // The parts of a symbol which are size specific. Using a template
515 // derived class like this helps us use less space on a 32-bit system.
518 class Sized_symbol : public Symbol
521 typedef typename elfcpp::Elf_types<size>::Elf_Addr Value_type;
522 typedef typename elfcpp::Elf_types<size>::Elf_WXword Size_type;
527 // Initialize fields from an ELF symbol in OBJECT.
528 template<bool big_endian>
530 init(const char *name, const char* version, Object* object,
531 const elfcpp::Sym<size, big_endian>&);
533 // Initialize fields for an Output_data.
535 init(const char* name, Output_data*, Value_type value, Size_type symsize,
536 elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis,
537 bool offset_is_from_end);
539 // Initialize fields for an Output_segment.
541 init(const char* name, Output_segment*, Value_type value, Size_type symsize,
542 elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis,
543 Segment_offset_base offset_base);
545 // Initialize fields for a constant.
547 init(const char* name, Value_type value, Size_type symsize,
548 elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis);
550 // Override existing symbol.
551 template<bool big_endian>
553 override(const elfcpp::Sym<size, big_endian>&, Object* object,
554 const char* version);
556 // Override existing symbol with a special symbol.
558 override_with_special(const Sized_symbol<size>*);
560 // Return the symbol's value.
563 { return this->value_; }
565 // Return the symbol's size (we can't call this 'size' because that
566 // is a template parameter).
569 { return this->symsize_; }
571 // Set the symbol size. This is used when resolving common symbols.
573 set_symsize(Size_type symsize)
574 { this->symsize_ = symsize; }
576 // Set the symbol value. This is called when we store the final
577 // values of the symbols into the symbol table.
579 set_value(Value_type value)
580 { this->value_ = value; }
583 Sized_symbol(const Sized_symbol&);
584 Sized_symbol& operator=(const Sized_symbol&);
586 // Symbol value. Before Layout::finalize this is the offset in the
587 // input section. This is set to the final value during
594 // A struct describing a symbol defined by the linker, where the value
595 // of the symbol is defined based on an output section. This is used
596 // for symbols defined by the linker, like "_init_array_start".
598 struct Define_symbol_in_section
602 // The name of the output section with which this symbol should be
603 // associated. If there is no output section with that name, the
604 // symbol will be defined as zero.
605 const char* output_section;
606 // The offset of the symbol within the output section. This is an
607 // offset from the start of the output section, unless start_at_end
608 // is true, in which case this is an offset from the end of the
611 // The size of the symbol.
615 // The symbol binding.
617 // The symbol visibility.
618 elfcpp::STV visibility;
619 // The rest of the st_other field.
620 unsigned char nonvis;
621 // If true, the value field is an offset from the end of the output
623 bool offset_is_from_end;
624 // If true, this symbol is defined only if we see a reference to it.
628 // A struct describing a symbol defined by the linker, where the value
629 // of the symbol is defined based on a segment. This is used for
630 // symbols defined by the linker, like "_end". We describe the
631 // segment with which the symbol should be associated by its
632 // characteristics. If no segment meets these characteristics, the
633 // symbol will be defined as zero. If there is more than one segment
634 // which meets these characteristics, we will use the first one.
636 struct Define_symbol_in_segment
640 // The segment type where the symbol should be defined, typically
642 elfcpp::PT segment_type;
643 // Bitmask of segment flags which must be set.
644 elfcpp::PF segment_flags_set;
645 // Bitmask of segment flags which must be clear.
646 elfcpp::PF segment_flags_clear;
647 // The offset of the symbol within the segment. The offset is
648 // calculated from the position set by offset_base.
650 // The size of the symbol.
654 // The symbol binding.
656 // The symbol visibility.
657 elfcpp::STV visibility;
658 // The rest of the st_other field.
659 unsigned char nonvis;
660 // The base from which we compute the offset.
661 Symbol::Segment_offset_base offset_base;
662 // If true, this symbol is defined only if we see a reference to it.
666 // This class manages warnings. Warnings are a GNU extension. When
667 // we see a section named .gnu.warning.SYM in an object file, and if
668 // we wind using the definition of SYM from that object file, then we
669 // will issue a warning for any relocation against SYM from a
670 // different object file. The text of the warning is the contents of
671 // the section. This is not precisely the definition used by the old
672 // GNU linker; the old GNU linker treated an occurrence of
673 // .gnu.warning.SYM as defining a warning symbol. A warning symbol
674 // would trigger a warning on any reference. However, it was
675 // inconsistent in that a warning in a dynamic object only triggered
676 // if there was no definition in a regular object. This linker is
677 // different in that we only issue a warning if we use the symbol
678 // definition from the same object file as the warning section.
687 // Add a warning for symbol NAME in section SHNDX in object OBJ.
689 add_warning(Symbol_table* symtab, const char* name, Object* obj,
692 // For each symbol for which we should give a warning, make a note
695 note_warnings(Symbol_table* symtab);
697 // Issue a warning for a reference to SYM at LOCATION.
699 issue_warning(const Symbol* sym, const std::string& location) const;
702 Warnings(const Warnings&);
703 Warnings& operator=(const Warnings&);
705 // What we need to know to get the warning text.
706 struct Warning_location
708 // The object the warning is in.
710 // The index of the warning section.
712 // The warning text if we have already loaded it.
716 : object(NULL), shndx(0), text()
720 set(Object* o, unsigned int s)
727 set_text(const char* t, off_t l)
728 { this->text.assign(t, l); }
731 // A mapping from warning symbol names (canonicalized in
732 // Symbol_table's namepool_ field) to
733 typedef Unordered_map<const char*, Warning_location> Warning_table;
735 Warning_table warnings_;
738 // The main linker symbol table.
747 // Add COUNT external symbols from the relocatable object RELOBJ to
748 // the symbol table. SYMS is the symbols, SYM_NAMES is their names,
749 // SYM_NAME_SIZE is the size of SYM_NAMES. This sets SYMPOINTERS to
750 // point to the symbols in the symbol table.
751 template<int size, bool big_endian>
753 add_from_relobj(Sized_relobj<size, big_endian>* relobj,
754 const unsigned char* syms, size_t count,
755 const char* sym_names, size_t sym_name_size,
756 Symbol** sympointers);
758 // Add COUNT dynamic symbols from the dynamic object DYNOBJ to the
759 // symbol table. SYMS is the symbols. SYM_NAMES is their names.
760 // SYM_NAME_SIZE is the size of SYM_NAMES. The other parameters are
761 // symbol version data.
762 template<int size, bool big_endian>
764 add_from_dynobj(Sized_dynobj<size, big_endian>* dynobj,
765 const unsigned char* syms, size_t count,
766 const char* sym_names, size_t sym_name_size,
767 const unsigned char* versym, size_t versym_size,
768 const std::vector<const char*>*);
770 // Define a special symbol based on an Output_data. It is a
771 // multiple definition error if this symbol is already defined.
773 define_in_output_data(const Target*, const char* name, const char* version,
774 Output_data*, uint64_t value, uint64_t symsize,
775 elfcpp::STT type, elfcpp::STB binding,
776 elfcpp::STV visibility, unsigned char nonvis,
777 bool offset_is_from_end, bool only_if_ref);
779 // Define a special symbol based on an Output_segment. It is a
780 // multiple definition error if this symbol is already defined.
782 define_in_output_segment(const Target*, const char* name,
783 const char* version, Output_segment*,
784 uint64_t value, uint64_t symsize,
785 elfcpp::STT type, elfcpp::STB binding,
786 elfcpp::STV visibility, unsigned char nonvis,
787 Symbol::Segment_offset_base, bool only_if_ref);
789 // Define a special symbol with a constant value. It is a multiple
790 // definition error if this symbol is already defined.
792 define_as_constant(const Target*, const char* name, const char* version,
793 uint64_t value, uint64_t symsize, elfcpp::STT type,
794 elfcpp::STB binding, elfcpp::STV visibility,
795 unsigned char nonvis, bool only_if_ref);
797 // Define a set of symbols in output sections.
799 define_symbols(const Layout*, const Target*, int count,
800 const Define_symbol_in_section*);
802 // Define a set of symbols in output segments.
804 define_symbols(const Layout*, const Target*, int count,
805 const Define_symbol_in_segment*);
809 lookup(const char*, const char* version = NULL) const;
811 // Return the real symbol associated with the forwarder symbol FROM.
813 resolve_forwards(const Symbol* from) const;
815 // Return the bitsize (32 or 64) of the symbols in the table.
818 { return this->size_; }
820 // Return the sized version of a symbol in this table.
823 get_sized_symbol(Symbol* ACCEPT_SIZE) const;
826 const Sized_symbol<size>*
827 get_sized_symbol(const Symbol* ACCEPT_SIZE) const;
829 // Return the count of undefined symbols seen.
831 saw_undefined() const
832 { return this->saw_undefined_; }
834 // Allocate the common symbols
836 allocate_commons(const General_options&, Layout*);
838 // Add a warning for symbol NAME in section SHNDX in object OBJ.
840 add_warning(const char* name, Object* obj, unsigned int shndx)
841 { this->warnings_.add_warning(this, name, obj, shndx); }
843 // Canonicalize a symbol name for use in the hash table.
845 canonicalize_name(const char* name)
846 { return this->namepool_.add(name, NULL); }
848 // Possibly issue a warning for a reference to SYM at LOCATION which
851 issue_warning(const Symbol* sym, const std::string& location) const
852 { this->warnings_.issue_warning(sym, location); }
854 // Set the dynamic symbol indexes. INDEX is the index of the first
855 // global dynamic symbol. Pointers to the symbols are stored into
856 // the vector. The names are stored into the Stringpool. This
857 // returns an updated dynamic symbol index.
859 set_dynsym_indexes(const General_options*, const Target*, unsigned int index,
860 std::vector<Symbol*>*, Stringpool*, Versions*);
862 // Finalize the symbol table after we have set the final addresses
863 // of all the input sections. This sets the final symbol indexes,
864 // values and adds the names to *POOL. INDEX is the index of the
865 // first global symbol. OFF is the file offset of the global symbol
866 // table, DYNOFF is the offset of the globals in the dynamic symbol
867 // table, DYN_GLOBAL_INDEX is the index of the first global dynamic
868 // symbol, and DYNCOUNT is the number of global dynamic symbols.
869 // This records the parameters, and returns the new file offset.
871 finalize(unsigned int index, off_t off, off_t dynoff,
872 size_t dyn_global_index, size_t dyncount, Stringpool* pool);
874 // Write out the global symbols.
876 write_globals(const Target*, const Stringpool*, const Stringpool*,
879 // Write out a section symbol. Return the updated offset.
881 write_section_symbol(const Target*, const Output_section*, Output_file*,
885 Symbol_table(const Symbol_table&);
886 Symbol_table& operator=(const Symbol_table&);
888 // Set the size (32 or 64) of the symbols in the table.
891 { this->size_ = size; }
893 // Make FROM a forwarder symbol to TO.
895 make_forwarder(Symbol* from, Symbol* to);
898 template<int size, bool big_endian>
900 add_from_object(Object*, const char *name, Stringpool::Key name_key,
901 const char *version, Stringpool::Key version_key,
902 bool def, const elfcpp::Sym<size, big_endian>& sym);
905 template<int size, bool big_endian>
907 resolve(Sized_symbol<size>* to,
908 const elfcpp::Sym<size, big_endian>& sym,
909 Object*, const char* version);
911 template<int size, bool big_endian>
913 resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from,
914 const char* version ACCEPT_SIZE_ENDIAN);
916 // Whether we should override a symbol, based on flags in
919 should_override(const Symbol*, unsigned int, bool*);
921 // Whether we should override a symbol with a special symbol which
922 // is automatically defined by the linker.
924 should_override_with_special(const Symbol*);
926 // Define a special symbol.
927 template<int size, bool big_endian>
929 define_special_symbol(const Target* target, const char* name,
930 const char* version, bool only_if_ref,
931 Sized_symbol<size>** poldsym ACCEPT_SIZE_ENDIAN);
933 // Define a symbol in an Output_data, sized version.
936 do_define_in_output_data(const Target*, const char* name,
937 const char* version, Output_data*,
938 typename elfcpp::Elf_types<size>::Elf_Addr value,
939 typename elfcpp::Elf_types<size>::Elf_WXword ssize,
940 elfcpp::STT type, elfcpp::STB binding,
941 elfcpp::STV visibility, unsigned char nonvis,
942 bool offset_is_from_end, bool only_if_ref);
944 // Define a symbol in an Output_segment, sized version.
947 do_define_in_output_segment(
948 const Target*, const char* name, const char* version, Output_segment* os,
949 typename elfcpp::Elf_types<size>::Elf_Addr value,
950 typename elfcpp::Elf_types<size>::Elf_WXword ssize,
951 elfcpp::STT type, elfcpp::STB binding,
952 elfcpp::STV visibility, unsigned char nonvis,
953 Symbol::Segment_offset_base offset_base, bool only_if_ref);
955 // Define a symbol as a constant, sized version.
958 do_define_as_constant(
959 const Target*, const char* name, const char* version,
960 typename elfcpp::Elf_types<size>::Elf_Addr value,
961 typename elfcpp::Elf_types<size>::Elf_WXword ssize,
962 elfcpp::STT type, elfcpp::STB binding,
963 elfcpp::STV visibility, unsigned char nonvis,
966 // Allocate the common symbols, sized version.
969 do_allocate_commons(const General_options&, Layout*);
971 // Finalize symbols specialized for size.
974 sized_finalize(unsigned int, off_t, Stringpool*);
976 // Write globals specialized for size and endianness.
977 template<int size, bool big_endian>
979 sized_write_globals(const Target*, const Stringpool*, const Stringpool*,
982 // Write out a symbol to P.
983 template<int size, bool big_endian>
985 sized_write_symbol(Sized_symbol<size>*, unsigned int shndx,
986 const Stringpool*, unsigned char* p
987 ACCEPT_SIZE_ENDIAN) const;
989 // Write out a section symbol, specialized for size and endianness.
990 template<int size, bool big_endian>
992 sized_write_section_symbol(const Output_section*, Output_file*, off_t) const;
994 // The type of the symbol hash table.
996 typedef std::pair<Stringpool::Key, Stringpool::Key> Symbol_table_key;
998 struct Symbol_table_hash
1001 operator()(const Symbol_table_key&) const;
1004 struct Symbol_table_eq
1007 operator()(const Symbol_table_key&, const Symbol_table_key&) const;
1010 typedef Unordered_map<Symbol_table_key, Symbol*, Symbol_table_hash,
1011 Symbol_table_eq> Symbol_table_type;
1013 // The type of the list of common symbols.
1015 typedef std::vector<Symbol*> Commons_type;
1017 // The size of the symbols in the symbol table (32 or 64).
1020 // We increment this every time we see a new undefined symbol, for
1021 // use in archive groups.
1024 // The index of the first global symbol in the output file.
1025 unsigned int first_global_index_;
1027 // The file offset within the output symtab section where we should
1031 // The number of global symbols we want to write out.
1032 size_t output_count_;
1034 // The file offset of the global dynamic symbols, or 0 if none.
1035 off_t dynamic_offset_;
1037 // The index of the first global dynamic symbol.
1038 unsigned int first_dynamic_global_index_;
1040 // The number of global dynamic symbols, or 0 if none.
1041 off_t dynamic_count_;
1043 // The symbol hash table.
1044 Symbol_table_type table_;
1046 // A pool of symbol names. This is used for all global symbols.
1047 // Entries in the hash table point into this pool.
1048 Stringpool namepool_;
1050 // Forwarding symbols.
1051 Unordered_map<const Symbol*, Symbol*> forwarders_;
1053 // We don't expect there to be very many common symbols, so we keep
1054 // a list of them. When we find a common symbol we add it to this
1055 // list. It is possible that by the time we process the list the
1056 // symbol is no longer a common symbol. It may also have become a
1058 Commons_type commons_;
1060 // Manage symbol warnings.
1064 // We inline get_sized_symbol for efficiency.
1068 Symbol_table::get_sized_symbol(Symbol* sym ACCEPT_SIZE) const
1070 gold_assert(size == this->get_size());
1071 return static_cast<Sized_symbol<size>*>(sym);
1075 const Sized_symbol<size>*
1076 Symbol_table::get_sized_symbol(const Symbol* sym ACCEPT_SIZE) const
1078 gold_assert(size == this->get_size());
1079 return static_cast<const Sized_symbol<size>*>(sym);
1082 } // End namespace gold.
1084 #endif // !defined(GOLD_SYMTAB_H)