1 // symtab.cc -- the gold symbol table
3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
35 #include "dwarf_reader.h"
39 #include "workqueue.h"
43 #include "incremental.h"
50 // Initialize fields in Symbol. This initializes everything except u_
54 Symbol::init_fields(const char* name, const char* version,
55 elfcpp::STT type, elfcpp::STB binding,
56 elfcpp::STV visibility, unsigned char nonvis)
59 this->version_ = version;
60 this->symtab_index_ = 0;
61 this->dynsym_index_ = 0;
62 this->got_offsets_.init();
63 this->plt_offset_ = -1U;
65 this->binding_ = binding;
66 this->visibility_ = visibility;
67 this->nonvis_ = nonvis;
68 this->is_def_ = false;
69 this->is_forwarder_ = false;
70 this->has_alias_ = false;
71 this->needs_dynsym_entry_ = false;
72 this->in_reg_ = false;
73 this->in_dyn_ = false;
74 this->has_warning_ = false;
75 this->is_copied_from_dynobj_ = false;
76 this->is_forced_local_ = false;
77 this->is_ordinary_shndx_ = false;
78 this->in_real_elf_ = false;
79 this->is_defined_in_discarded_section_ = false;
80 this->undef_binding_set_ = false;
81 this->undef_binding_weak_ = false;
82 this->is_predefined_ = false;
85 // Return the demangled version of the symbol's name, but only
86 // if the --demangle flag was set.
89 demangle(const char* name)
91 if (!parameters->options().do_demangle())
94 // cplus_demangle allocates memory for the result it returns,
95 // and returns NULL if the name is already demangled.
96 char* demangled_name = cplus_demangle(name, DMGL_ANSI | DMGL_PARAMS);
97 if (demangled_name == NULL)
100 std::string retval(demangled_name);
101 free(demangled_name);
106 Symbol::demangled_name() const
108 return demangle(this->name());
111 // Initialize the fields in the base class Symbol for SYM in OBJECT.
113 template<int size, bool big_endian>
115 Symbol::init_base_object(const char* name, const char* version, Object* object,
116 const elfcpp::Sym<size, big_endian>& sym,
117 unsigned int st_shndx, bool is_ordinary)
119 this->init_fields(name, version, sym.get_st_type(), sym.get_st_bind(),
120 sym.get_st_visibility(), sym.get_st_nonvis());
121 this->u_.from_object.object = object;
122 this->u_.from_object.shndx = st_shndx;
123 this->is_ordinary_shndx_ = is_ordinary;
124 this->source_ = FROM_OBJECT;
125 this->in_reg_ = !object->is_dynamic();
126 this->in_dyn_ = object->is_dynamic();
127 this->in_real_elf_ = object->pluginobj() == NULL;
130 // Initialize the fields in the base class Symbol for a symbol defined
131 // in an Output_data.
134 Symbol::init_base_output_data(const char* name, const char* version,
135 Output_data* od, elfcpp::STT type,
136 elfcpp::STB binding, elfcpp::STV visibility,
137 unsigned char nonvis, bool offset_is_from_end,
140 this->init_fields(name, version, type, binding, visibility, nonvis);
141 this->u_.in_output_data.output_data = od;
142 this->u_.in_output_data.offset_is_from_end = offset_is_from_end;
143 this->source_ = IN_OUTPUT_DATA;
144 this->in_reg_ = true;
145 this->in_real_elf_ = true;
146 this->is_predefined_ = is_predefined;
149 // Initialize the fields in the base class Symbol for a symbol defined
150 // in an Output_segment.
153 Symbol::init_base_output_segment(const char* name, const char* version,
154 Output_segment* os, elfcpp::STT type,
155 elfcpp::STB binding, elfcpp::STV visibility,
156 unsigned char nonvis,
157 Segment_offset_base offset_base,
160 this->init_fields(name, version, type, binding, visibility, nonvis);
161 this->u_.in_output_segment.output_segment = os;
162 this->u_.in_output_segment.offset_base = offset_base;
163 this->source_ = IN_OUTPUT_SEGMENT;
164 this->in_reg_ = true;
165 this->in_real_elf_ = true;
166 this->is_predefined_ = is_predefined;
169 // Initialize the fields in the base class Symbol for a symbol defined
173 Symbol::init_base_constant(const char* name, const char* version,
174 elfcpp::STT type, elfcpp::STB binding,
175 elfcpp::STV visibility, unsigned char nonvis,
178 this->init_fields(name, version, type, binding, visibility, nonvis);
179 this->source_ = IS_CONSTANT;
180 this->in_reg_ = true;
181 this->in_real_elf_ = true;
182 this->is_predefined_ = is_predefined;
185 // Initialize the fields in the base class Symbol for an undefined
189 Symbol::init_base_undefined(const char* name, const char* version,
190 elfcpp::STT type, elfcpp::STB binding,
191 elfcpp::STV visibility, unsigned char nonvis)
193 this->init_fields(name, version, type, binding, visibility, nonvis);
194 this->dynsym_index_ = -1U;
195 this->source_ = IS_UNDEFINED;
196 this->in_reg_ = true;
197 this->in_real_elf_ = true;
200 // Allocate a common symbol in the base.
203 Symbol::allocate_base_common(Output_data* od)
205 gold_assert(this->is_common());
206 this->source_ = IN_OUTPUT_DATA;
207 this->u_.in_output_data.output_data = od;
208 this->u_.in_output_data.offset_is_from_end = false;
211 // Initialize the fields in Sized_symbol for SYM in OBJECT.
214 template<bool big_endian>
216 Sized_symbol<size>::init_object(const char* name, const char* version,
218 const elfcpp::Sym<size, big_endian>& sym,
219 unsigned int st_shndx, bool is_ordinary)
221 this->init_base_object(name, version, object, sym, st_shndx, is_ordinary);
222 this->value_ = sym.get_st_value();
223 this->symsize_ = sym.get_st_size();
226 // Initialize the fields in Sized_symbol for a symbol defined in an
231 Sized_symbol<size>::init_output_data(const char* name, const char* version,
232 Output_data* od, Value_type value,
233 Size_type symsize, elfcpp::STT type,
235 elfcpp::STV visibility,
236 unsigned char nonvis,
237 bool offset_is_from_end,
240 this->init_base_output_data(name, version, od, type, binding, visibility,
241 nonvis, offset_is_from_end, is_predefined);
242 this->value_ = value;
243 this->symsize_ = symsize;
246 // Initialize the fields in Sized_symbol for a symbol defined in an
251 Sized_symbol<size>::init_output_segment(const char* name, const char* version,
252 Output_segment* os, Value_type value,
253 Size_type symsize, elfcpp::STT type,
255 elfcpp::STV visibility,
256 unsigned char nonvis,
257 Segment_offset_base offset_base,
260 this->init_base_output_segment(name, version, os, type, binding, visibility,
261 nonvis, offset_base, is_predefined);
262 this->value_ = value;
263 this->symsize_ = symsize;
266 // Initialize the fields in Sized_symbol for a symbol defined as a
271 Sized_symbol<size>::init_constant(const char* name, const char* version,
272 Value_type value, Size_type symsize,
273 elfcpp::STT type, elfcpp::STB binding,
274 elfcpp::STV visibility, unsigned char nonvis,
277 this->init_base_constant(name, version, type, binding, visibility, nonvis,
279 this->value_ = value;
280 this->symsize_ = symsize;
283 // Initialize the fields in Sized_symbol for an undefined symbol.
287 Sized_symbol<size>::init_undefined(const char* name, const char* version,
288 elfcpp::STT type, elfcpp::STB binding,
289 elfcpp::STV visibility, unsigned char nonvis)
291 this->init_base_undefined(name, version, type, binding, visibility, nonvis);
296 // Return an allocated string holding the symbol's name as
297 // name@version. This is used for relocatable links.
300 Symbol::versioned_name() const
302 gold_assert(this->version_ != NULL);
303 std::string ret = this->name_;
307 ret += this->version_;
311 // Return true if SHNDX represents a common symbol.
314 Symbol::is_common_shndx(unsigned int shndx)
316 return (shndx == elfcpp::SHN_COMMON
317 || shndx == parameters->target().small_common_shndx()
318 || shndx == parameters->target().large_common_shndx());
321 // Allocate a common symbol.
325 Sized_symbol<size>::allocate_common(Output_data* od, Value_type value)
327 this->allocate_base_common(od);
328 this->value_ = value;
331 // The ""'s around str ensure str is a string literal, so sizeof works.
332 #define strprefix(var, str) (strncmp(var, str, sizeof("" str "") - 1) == 0)
334 // Return true if this symbol should be added to the dynamic symbol
338 Symbol::should_add_dynsym_entry(Symbol_table* symtab) const
340 // If the symbol is only present on plugin files, the plugin decided we
342 if (!this->in_real_elf())
345 // If the symbol is used by a dynamic relocation, we need to add it.
346 if (this->needs_dynsym_entry())
349 // If this symbol's section is not added, the symbol need not be added.
350 // The section may have been GCed. Note that export_dynamic is being
351 // overridden here. This should not be done for shared objects.
352 if (parameters->options().gc_sections()
353 && !parameters->options().shared()
354 && this->source() == Symbol::FROM_OBJECT
355 && !this->object()->is_dynamic())
357 Relobj* relobj = static_cast<Relobj*>(this->object());
359 unsigned int shndx = this->shndx(&is_ordinary);
360 if (is_ordinary && shndx != elfcpp::SHN_UNDEF
361 && !relobj->is_section_included(shndx)
362 && !symtab->is_section_folded(relobj, shndx))
366 // If the symbol was forced local in a version script, do not add it.
367 if (this->is_forced_local())
370 // If the symbol was forced dynamic in a --dynamic-list file, add it.
371 if (parameters->options().in_dynamic_list(this->name()))
374 // If dynamic-list-data was specified, add any STT_OBJECT.
375 if (parameters->options().dynamic_list_data()
376 && !this->is_from_dynobj()
377 && this->type() == elfcpp::STT_OBJECT)
380 // If --dynamic-list-cpp-new was specified, add any new/delete symbol.
381 // If --dynamic-list-cpp-typeinfo was specified, add any typeinfo symbols.
382 if ((parameters->options().dynamic_list_cpp_new()
383 || parameters->options().dynamic_list_cpp_typeinfo())
384 && !this->is_from_dynobj())
386 // TODO(csilvers): We could probably figure out if we're an operator
387 // new/delete or typeinfo without the need to demangle.
388 char* demangled_name = cplus_demangle(this->name(),
389 DMGL_ANSI | DMGL_PARAMS);
390 if (demangled_name == NULL)
392 // Not a C++ symbol, so it can't satisfy these flags
394 else if (parameters->options().dynamic_list_cpp_new()
395 && (strprefix(demangled_name, "operator new")
396 || strprefix(demangled_name, "operator delete")))
398 free(demangled_name);
401 else if (parameters->options().dynamic_list_cpp_typeinfo()
402 && (strprefix(demangled_name, "typeinfo name for")
403 || strprefix(demangled_name, "typeinfo for")))
405 free(demangled_name);
409 free(demangled_name);
412 // If exporting all symbols or building a shared library,
413 // and the symbol is defined in a regular object and is
414 // externally visible, we need to add it.
415 if ((parameters->options().export_dynamic() || parameters->options().shared())
416 && !this->is_from_dynobj()
417 && this->is_externally_visible())
423 // Return true if the final value of this symbol is known at link
427 Symbol::final_value_is_known() const
429 // If we are not generating an executable, then no final values are
430 // known, since they will change at runtime.
431 if (parameters->options().output_is_position_independent()
432 || parameters->options().relocatable())
435 // If the symbol is not from an object file, and is not undefined,
436 // then it is defined, and known.
437 if (this->source_ != FROM_OBJECT)
439 if (this->source_ != IS_UNDEFINED)
444 // If the symbol is from a dynamic object, then the final value
446 if (this->object()->is_dynamic())
449 // If the symbol is not undefined (it is defined or common),
450 // then the final value is known.
451 if (!this->is_undefined())
455 // If the symbol is undefined, then whether the final value is known
456 // depends on whether we are doing a static link. If we are doing a
457 // dynamic link, then the final value could be filled in at runtime.
458 // This could reasonably be the case for a weak undefined symbol.
459 return parameters->doing_static_link();
462 // Return the output section where this symbol is defined.
465 Symbol::output_section() const
467 switch (this->source_)
471 unsigned int shndx = this->u_.from_object.shndx;
472 if (shndx != elfcpp::SHN_UNDEF && this->is_ordinary_shndx_)
474 gold_assert(!this->u_.from_object.object->is_dynamic());
475 gold_assert(this->u_.from_object.object->pluginobj() == NULL);
476 Relobj* relobj = static_cast<Relobj*>(this->u_.from_object.object);
477 return relobj->output_section(shndx);
483 return this->u_.in_output_data.output_data->output_section();
485 case IN_OUTPUT_SEGMENT:
495 // Set the symbol's output section. This is used for symbols defined
496 // in scripts. This should only be called after the symbol table has
500 Symbol::set_output_section(Output_section* os)
502 switch (this->source_)
506 gold_assert(this->output_section() == os);
509 this->source_ = IN_OUTPUT_DATA;
510 this->u_.in_output_data.output_data = os;
511 this->u_.in_output_data.offset_is_from_end = false;
513 case IN_OUTPUT_SEGMENT:
520 // Class Symbol_table.
522 Symbol_table::Symbol_table(unsigned int count,
523 const Version_script_info& version_script)
524 : saw_undefined_(0), offset_(0), table_(count), namepool_(),
525 forwarders_(), commons_(), tls_commons_(), small_commons_(),
526 large_commons_(), forced_locals_(), warnings_(),
527 version_script_(version_script), gc_(NULL), icf_(NULL)
529 namepool_.reserve(count);
532 Symbol_table::~Symbol_table()
536 // The symbol table key equality function. This is called with
540 Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1,
541 const Symbol_table_key& k2) const
543 return k1.first == k2.first && k1.second == k2.second;
547 Symbol_table::is_section_folded(Object* obj, unsigned int shndx) const
549 return (parameters->options().icf_enabled()
550 && this->icf_->is_section_folded(obj, shndx));
553 // For symbols that have been listed with -u option, add them to the
554 // work list to avoid gc'ing them.
557 Symbol_table::gc_mark_undef_symbols(Layout* layout)
559 for (options::String_set::const_iterator p =
560 parameters->options().undefined_begin();
561 p != parameters->options().undefined_end();
564 const char* name = p->c_str();
565 Symbol* sym = this->lookup(name);
566 gold_assert(sym != NULL);
567 if (sym->source() == Symbol::FROM_OBJECT
568 && !sym->object()->is_dynamic())
570 Relobj* obj = static_cast<Relobj*>(sym->object());
572 unsigned int shndx = sym->shndx(&is_ordinary);
575 gold_assert(this->gc_ != NULL);
576 this->gc_->worklist().push(Section_id(obj, shndx));
581 for (Script_options::referenced_const_iterator p =
582 layout->script_options()->referenced_begin();
583 p != layout->script_options()->referenced_end();
586 Symbol* sym = this->lookup(p->c_str());
587 gold_assert(sym != NULL);
588 if (sym->source() == Symbol::FROM_OBJECT
589 && !sym->object()->is_dynamic())
591 Relobj* obj = static_cast<Relobj*>(sym->object());
593 unsigned int shndx = sym->shndx(&is_ordinary);
596 gold_assert(this->gc_ != NULL);
597 this->gc_->worklist().push(Section_id(obj, shndx));
604 Symbol_table::gc_mark_symbol_for_shlib(Symbol* sym)
606 if (!sym->is_from_dynobj()
607 && sym->is_externally_visible())
609 //Add the object and section to the work list.
610 Relobj* obj = static_cast<Relobj*>(sym->object());
612 unsigned int shndx = sym->shndx(&is_ordinary);
613 if (is_ordinary && shndx != elfcpp::SHN_UNDEF)
615 gold_assert(this->gc_!= NULL);
616 this->gc_->worklist().push(Section_id(obj, shndx));
621 // When doing garbage collection, keep symbols that have been seen in
624 Symbol_table::gc_mark_dyn_syms(Symbol* sym)
626 if (sym->in_dyn() && sym->source() == Symbol::FROM_OBJECT
627 && !sym->object()->is_dynamic())
629 Relobj* obj = static_cast<Relobj*>(sym->object());
631 unsigned int shndx = sym->shndx(&is_ordinary);
632 if (is_ordinary && shndx != elfcpp::SHN_UNDEF)
634 gold_assert(this->gc_ != NULL);
635 this->gc_->worklist().push(Section_id(obj, shndx));
640 // Make TO a symbol which forwards to FROM.
643 Symbol_table::make_forwarder(Symbol* from, Symbol* to)
645 gold_assert(from != to);
646 gold_assert(!from->is_forwarder() && !to->is_forwarder());
647 this->forwarders_[from] = to;
648 from->set_forwarder();
651 // Resolve the forwards from FROM, returning the real symbol.
654 Symbol_table::resolve_forwards(const Symbol* from) const
656 gold_assert(from->is_forwarder());
657 Unordered_map<const Symbol*, Symbol*>::const_iterator p =
658 this->forwarders_.find(from);
659 gold_assert(p != this->forwarders_.end());
663 // Look up a symbol by name.
666 Symbol_table::lookup(const char* name, const char* version) const
668 Stringpool::Key name_key;
669 name = this->namepool_.find(name, &name_key);
673 Stringpool::Key version_key = 0;
676 version = this->namepool_.find(version, &version_key);
681 Symbol_table_key key(name_key, version_key);
682 Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key);
683 if (p == this->table_.end())
688 // Resolve a Symbol with another Symbol. This is only used in the
689 // unusual case where there are references to both an unversioned
690 // symbol and a symbol with a version, and we then discover that that
691 // version is the default version. Because this is unusual, we do
692 // this the slow way, by converting back to an ELF symbol.
694 template<int size, bool big_endian>
696 Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from)
698 unsigned char buf[elfcpp::Elf_sizes<size>::sym_size];
699 elfcpp::Sym_write<size, big_endian> esym(buf);
700 // We don't bother to set the st_name or the st_shndx field.
701 esym.put_st_value(from->value());
702 esym.put_st_size(from->symsize());
703 esym.put_st_info(from->binding(), from->type());
704 esym.put_st_other(from->visibility(), from->nonvis());
706 unsigned int shndx = from->shndx(&is_ordinary);
707 this->resolve(to, esym.sym(), shndx, is_ordinary, shndx, from->object(),
713 if (parameters->options().gc_sections())
714 this->gc_mark_dyn_syms(to);
717 // Record that a symbol is forced to be local by a version script or
721 Symbol_table::force_local(Symbol* sym)
723 if (!sym->is_defined() && !sym->is_common())
725 if (sym->is_forced_local())
727 // We already got this one.
730 sym->set_is_forced_local();
731 this->forced_locals_.push_back(sym);
734 // Adjust NAME for wrapping, and update *NAME_KEY if necessary. This
735 // is only called for undefined symbols, when at least one --wrap
739 Symbol_table::wrap_symbol(const char* name, Stringpool::Key* name_key)
741 // For some targets, we need to ignore a specific character when
742 // wrapping, and add it back later.
744 if (name[0] == parameters->target().wrap_char())
750 if (parameters->options().is_wrap(name))
752 // Turn NAME into __wrap_NAME.
759 // This will give us both the old and new name in NAMEPOOL_, but
760 // that is OK. Only the versions we need will wind up in the
761 // real string table in the output file.
762 return this->namepool_.add(s.c_str(), true, name_key);
765 const char* const real_prefix = "__real_";
766 const size_t real_prefix_length = strlen(real_prefix);
767 if (strncmp(name, real_prefix, real_prefix_length) == 0
768 && parameters->options().is_wrap(name + real_prefix_length))
770 // Turn __real_NAME into NAME.
774 s += name + real_prefix_length;
775 return this->namepool_.add(s.c_str(), true, name_key);
781 // This is called when we see a symbol NAME/VERSION, and the symbol
782 // already exists in the symbol table, and VERSION is marked as being
783 // the default version. SYM is the NAME/VERSION symbol we just added.
784 // DEFAULT_IS_NEW is true if this is the first time we have seen the
785 // symbol NAME/NULL. PDEF points to the entry for NAME/NULL.
787 template<int size, bool big_endian>
789 Symbol_table::define_default_version(Sized_symbol<size>* sym,
791 Symbol_table_type::iterator pdef)
795 // This is the first time we have seen NAME/NULL. Make
796 // NAME/NULL point to NAME/VERSION, and mark SYM as the default
799 sym->set_is_default();
801 else if (pdef->second == sym)
803 // NAME/NULL already points to NAME/VERSION. Don't mark the
804 // symbol as the default if it is not already the default.
808 // This is the unfortunate case where we already have entries
809 // for both NAME/VERSION and NAME/NULL. We now see a symbol
810 // NAME/VERSION where VERSION is the default version. We have
811 // already resolved this new symbol with the existing
812 // NAME/VERSION symbol.
814 // It's possible that NAME/NULL and NAME/VERSION are both
815 // defined in regular objects. This can only happen if one
816 // object file defines foo and another defines foo@@ver. This
817 // is somewhat obscure, but we call it a multiple definition
820 // It's possible that NAME/NULL actually has a version, in which
821 // case it won't be the same as VERSION. This happens with
822 // ver_test_7.so in the testsuite for the symbol t2_2. We see
823 // t2_2@@VER2, so we define both t2_2/VER2 and t2_2/NULL. We
824 // then see an unadorned t2_2 in an object file and give it
825 // version VER1 from the version script. This looks like a
826 // default definition for VER1, so it looks like we should merge
827 // t2_2/NULL with t2_2/VER1. That doesn't make sense, but it's
828 // not obvious that this is an error, either. So we just punt.
830 // If one of the symbols has non-default visibility, and the
831 // other is defined in a shared object, then they are different
834 // Otherwise, we just resolve the symbols as though they were
837 if (pdef->second->version() != NULL)
838 gold_assert(pdef->second->version() != sym->version());
839 else if (sym->visibility() != elfcpp::STV_DEFAULT
840 && pdef->second->is_from_dynobj())
842 else if (pdef->second->visibility() != elfcpp::STV_DEFAULT
843 && sym->is_from_dynobj())
847 const Sized_symbol<size>* symdef;
848 symdef = this->get_sized_symbol<size>(pdef->second);
849 Symbol_table::resolve<size, big_endian>(sym, symdef);
850 this->make_forwarder(pdef->second, sym);
852 sym->set_is_default();
857 // Add one symbol from OBJECT to the symbol table. NAME is symbol
858 // name and VERSION is the version; both are canonicalized. DEF is
859 // whether this is the default version. ST_SHNDX is the symbol's
860 // section index; IS_ORDINARY is whether this is a normal section
861 // rather than a special code.
863 // If IS_DEFAULT_VERSION is true, then this is the definition of a
864 // default version of a symbol. That means that any lookup of
865 // NAME/NULL and any lookup of NAME/VERSION should always return the
866 // same symbol. This is obvious for references, but in particular we
867 // want to do this for definitions: overriding NAME/NULL should also
868 // override NAME/VERSION. If we don't do that, it would be very hard
869 // to override functions in a shared library which uses versioning.
871 // We implement this by simply making both entries in the hash table
872 // point to the same Symbol structure. That is easy enough if this is
873 // the first time we see NAME/NULL or NAME/VERSION, but it is possible
874 // that we have seen both already, in which case they will both have
875 // independent entries in the symbol table. We can't simply change
876 // the symbol table entry, because we have pointers to the entries
877 // attached to the object files. So we mark the entry attached to the
878 // object file as a forwarder, and record it in the forwarders_ map.
879 // Note that entries in the hash table will never be marked as
882 // ORIG_ST_SHNDX and ST_SHNDX are almost always the same.
883 // ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF
884 // for a special section code. ST_SHNDX may be modified if the symbol
885 // is defined in a section being discarded.
887 template<int size, bool big_endian>
889 Symbol_table::add_from_object(Object* object,
891 Stringpool::Key name_key,
893 Stringpool::Key version_key,
894 bool is_default_version,
895 const elfcpp::Sym<size, big_endian>& sym,
896 unsigned int st_shndx,
898 unsigned int orig_st_shndx)
900 // Print a message if this symbol is being traced.
901 if (parameters->options().is_trace_symbol(name))
903 if (orig_st_shndx == elfcpp::SHN_UNDEF)
904 gold_info(_("%s: reference to %s"), object->name().c_str(), name);
906 gold_info(_("%s: definition of %s"), object->name().c_str(), name);
909 // For an undefined symbol, we may need to adjust the name using
911 if (orig_st_shndx == elfcpp::SHN_UNDEF
912 && parameters->options().any_wrap())
914 const char* wrap_name = this->wrap_symbol(name, &name_key);
915 if (wrap_name != name)
917 // If we see a reference to malloc with version GLIBC_2.0,
918 // and we turn it into a reference to __wrap_malloc, then we
919 // discard the version number. Otherwise the user would be
920 // required to specify the correct version for
928 Symbol* const snull = NULL;
929 std::pair<typename Symbol_table_type::iterator, bool> ins =
930 this->table_.insert(std::make_pair(std::make_pair(name_key, version_key),
933 std::pair<typename Symbol_table_type::iterator, bool> insdefault =
934 std::make_pair(this->table_.end(), false);
935 if (is_default_version)
937 const Stringpool::Key vnull_key = 0;
938 insdefault = this->table_.insert(std::make_pair(std::make_pair(name_key,
943 // ins.first: an iterator, which is a pointer to a pair.
944 // ins.first->first: the key (a pair of name and version).
945 // ins.first->second: the value (Symbol*).
946 // ins.second: true if new entry was inserted, false if not.
948 Sized_symbol<size>* ret;
953 // We already have an entry for NAME/VERSION.
954 ret = this->get_sized_symbol<size>(ins.first->second);
955 gold_assert(ret != NULL);
957 was_undefined = ret->is_undefined();
958 was_common = ret->is_common();
960 this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object,
962 if (parameters->options().gc_sections())
963 this->gc_mark_dyn_syms(ret);
965 if (is_default_version)
966 this->define_default_version<size, big_endian>(ret, insdefault.second,
971 // This is the first time we have seen NAME/VERSION.
972 gold_assert(ins.first->second == NULL);
974 if (is_default_version && !insdefault.second)
976 // We already have an entry for NAME/NULL. If we override
977 // it, then change it to NAME/VERSION.
978 ret = this->get_sized_symbol<size>(insdefault.first->second);
980 was_undefined = ret->is_undefined();
981 was_common = ret->is_common();
983 this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object,
985 if (parameters->options().gc_sections())
986 this->gc_mark_dyn_syms(ret);
987 ins.first->second = ret;
991 was_undefined = false;
994 Sized_target<size, big_endian>* target =
995 parameters->sized_target<size, big_endian>();
996 if (!target->has_make_symbol())
997 ret = new Sized_symbol<size>();
1000 ret = target->make_symbol();
1003 // This means that we don't want a symbol table
1005 if (!is_default_version)
1006 this->table_.erase(ins.first);
1009 this->table_.erase(insdefault.first);
1010 // Inserting INSDEFAULT invalidated INS.
1011 this->table_.erase(std::make_pair(name_key,
1018 ret->init_object(name, version, object, sym, st_shndx, is_ordinary);
1020 ins.first->second = ret;
1021 if (is_default_version)
1023 // This is the first time we have seen NAME/NULL. Point
1024 // it at the new entry for NAME/VERSION.
1025 gold_assert(insdefault.second);
1026 insdefault.first->second = ret;
1030 if (is_default_version)
1031 ret->set_is_default();
1034 // Record every time we see a new undefined symbol, to speed up
1036 if (!was_undefined && ret->is_undefined())
1038 ++this->saw_undefined_;
1039 if (parameters->options().has_plugins())
1040 parameters->options().plugins()->new_undefined_symbol(ret);
1043 // Keep track of common symbols, to speed up common symbol
1045 if (!was_common && ret->is_common())
1047 if (ret->type() == elfcpp::STT_TLS)
1048 this->tls_commons_.push_back(ret);
1049 else if (!is_ordinary
1050 && st_shndx == parameters->target().small_common_shndx())
1051 this->small_commons_.push_back(ret);
1052 else if (!is_ordinary
1053 && st_shndx == parameters->target().large_common_shndx())
1054 this->large_commons_.push_back(ret);
1056 this->commons_.push_back(ret);
1059 // If we're not doing a relocatable link, then any symbol with
1060 // hidden or internal visibility is local.
1061 if ((ret->visibility() == elfcpp::STV_HIDDEN
1062 || ret->visibility() == elfcpp::STV_INTERNAL)
1063 && (ret->binding() == elfcpp::STB_GLOBAL
1064 || ret->binding() == elfcpp::STB_GNU_UNIQUE
1065 || ret->binding() == elfcpp::STB_WEAK)
1066 && !parameters->options().relocatable())
1067 this->force_local(ret);
1072 // Add all the symbols in a relocatable object to the hash table.
1074 template<int size, bool big_endian>
1076 Symbol_table::add_from_relobj(
1077 Sized_relobj_file<size, big_endian>* relobj,
1078 const unsigned char* syms,
1080 size_t symndx_offset,
1081 const char* sym_names,
1082 size_t sym_name_size,
1083 typename Sized_relobj_file<size, big_endian>::Symbols* sympointers,
1088 gold_assert(size == parameters->target().get_size());
1090 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
1092 const bool just_symbols = relobj->just_symbols();
1094 const unsigned char* p = syms;
1095 for (size_t i = 0; i < count; ++i, p += sym_size)
1097 (*sympointers)[i] = NULL;
1099 elfcpp::Sym<size, big_endian> sym(p);
1101 unsigned int st_name = sym.get_st_name();
1102 if (st_name >= sym_name_size)
1104 relobj->error(_("bad global symbol name offset %u at %zu"),
1109 const char* name = sym_names + st_name;
1112 unsigned int st_shndx = relobj->adjust_sym_shndx(i + symndx_offset,
1115 unsigned int orig_st_shndx = st_shndx;
1117 orig_st_shndx = elfcpp::SHN_UNDEF;
1119 if (st_shndx != elfcpp::SHN_UNDEF)
1122 // A symbol defined in a section which we are not including must
1123 // be treated as an undefined symbol.
1124 bool is_defined_in_discarded_section = false;
1125 if (st_shndx != elfcpp::SHN_UNDEF
1127 && !relobj->is_section_included(st_shndx)
1128 && !this->is_section_folded(relobj, st_shndx))
1130 st_shndx = elfcpp::SHN_UNDEF;
1131 is_defined_in_discarded_section = true;
1134 // In an object file, an '@' in the name separates the symbol
1135 // name from the version name. If there are two '@' characters,
1136 // this is the default version.
1137 const char* ver = strchr(name, '@');
1138 Stringpool::Key ver_key = 0;
1140 // IS_DEFAULT_VERSION: is the version default?
1141 // IS_FORCED_LOCAL: is the symbol forced local?
1142 bool is_default_version = false;
1143 bool is_forced_local = false;
1147 // The symbol name is of the form foo@VERSION or foo@@VERSION
1148 namelen = ver - name;
1152 is_default_version = true;
1155 ver = this->namepool_.add(ver, true, &ver_key);
1157 // We don't want to assign a version to an undefined symbol,
1158 // even if it is listed in the version script. FIXME: What
1159 // about a common symbol?
1162 namelen = strlen(name);
1163 if (!this->version_script_.empty()
1164 && st_shndx != elfcpp::SHN_UNDEF)
1166 // The symbol name did not have a version, but the
1167 // version script may assign a version anyway.
1168 std::string version;
1170 if (this->version_script_.get_symbol_version(name, &version,
1174 is_forced_local = true;
1175 else if (!version.empty())
1177 ver = this->namepool_.add_with_length(version.c_str(),
1181 is_default_version = true;
1187 elfcpp::Sym<size, big_endian>* psym = &sym;
1188 unsigned char symbuf[sym_size];
1189 elfcpp::Sym<size, big_endian> sym2(symbuf);
1192 memcpy(symbuf, p, sym_size);
1193 elfcpp::Sym_write<size, big_endian> sw(symbuf);
1194 if (orig_st_shndx != elfcpp::SHN_UNDEF && is_ordinary)
1196 // Symbol values in object files are section relative.
1197 // This is normally what we want, but since here we are
1198 // converting the symbol to absolute we need to add the
1199 // section address. The section address in an object
1200 // file is normally zero, but people can use a linker
1201 // script to change it.
1202 sw.put_st_value(sym.get_st_value()
1203 + relobj->section_address(orig_st_shndx));
1205 st_shndx = elfcpp::SHN_ABS;
1206 is_ordinary = false;
1210 // Fix up visibility if object has no-export set.
1211 if (relobj->no_export()
1212 && (orig_st_shndx != elfcpp::SHN_UNDEF || !is_ordinary))
1214 // We may have copied symbol already above.
1217 memcpy(symbuf, p, sym_size);
1221 elfcpp::STV visibility = sym2.get_st_visibility();
1222 if (visibility == elfcpp::STV_DEFAULT
1223 || visibility == elfcpp::STV_PROTECTED)
1225 elfcpp::Sym_write<size, big_endian> sw(symbuf);
1226 unsigned char nonvis = sym2.get_st_nonvis();
1227 sw.put_st_other(elfcpp::STV_HIDDEN, nonvis);
1231 Stringpool::Key name_key;
1232 name = this->namepool_.add_with_length(name, namelen, true,
1235 Sized_symbol<size>* res;
1236 res = this->add_from_object(relobj, name, name_key, ver, ver_key,
1237 is_default_version, *psym, st_shndx,
1238 is_ordinary, orig_st_shndx);
1240 // If building a shared library using garbage collection, do not
1241 // treat externally visible symbols as garbage.
1242 if (parameters->options().gc_sections()
1243 && parameters->options().shared())
1244 this->gc_mark_symbol_for_shlib(res);
1246 if (is_forced_local)
1247 this->force_local(res);
1249 if (is_defined_in_discarded_section)
1250 res->set_is_defined_in_discarded_section();
1252 (*sympointers)[i] = res;
1256 // Add a symbol from a plugin-claimed file.
1258 template<int size, bool big_endian>
1260 Symbol_table::add_from_pluginobj(
1261 Sized_pluginobj<size, big_endian>* obj,
1264 elfcpp::Sym<size, big_endian>* sym)
1266 unsigned int st_shndx = sym->get_st_shndx();
1267 bool is_ordinary = st_shndx < elfcpp::SHN_LORESERVE;
1269 Stringpool::Key ver_key = 0;
1270 bool is_default_version = false;
1271 bool is_forced_local = false;
1275 ver = this->namepool_.add(ver, true, &ver_key);
1277 // We don't want to assign a version to an undefined symbol,
1278 // even if it is listed in the version script. FIXME: What
1279 // about a common symbol?
1282 if (!this->version_script_.empty()
1283 && st_shndx != elfcpp::SHN_UNDEF)
1285 // The symbol name did not have a version, but the
1286 // version script may assign a version anyway.
1287 std::string version;
1289 if (this->version_script_.get_symbol_version(name, &version,
1293 is_forced_local = true;
1294 else if (!version.empty())
1296 ver = this->namepool_.add_with_length(version.c_str(),
1300 is_default_version = true;
1306 Stringpool::Key name_key;
1307 name = this->namepool_.add(name, true, &name_key);
1309 Sized_symbol<size>* res;
1310 res = this->add_from_object(obj, name, name_key, ver, ver_key,
1311 is_default_version, *sym, st_shndx,
1312 is_ordinary, st_shndx);
1314 if (is_forced_local)
1315 this->force_local(res);
1320 // Add all the symbols in a dynamic object to the hash table.
1322 template<int size, bool big_endian>
1324 Symbol_table::add_from_dynobj(
1325 Sized_dynobj<size, big_endian>* dynobj,
1326 const unsigned char* syms,
1328 const char* sym_names,
1329 size_t sym_name_size,
1330 const unsigned char* versym,
1332 const std::vector<const char*>* version_map,
1333 typename Sized_relobj_file<size, big_endian>::Symbols* sympointers,
1338 gold_assert(size == parameters->target().get_size());
1340 if (dynobj->just_symbols())
1342 gold_error(_("--just-symbols does not make sense with a shared object"));
1346 if (versym != NULL && versym_size / 2 < count)
1348 dynobj->error(_("too few symbol versions"));
1352 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
1354 // We keep a list of all STT_OBJECT symbols, so that we can resolve
1355 // weak aliases. This is necessary because if the dynamic object
1356 // provides the same variable under two names, one of which is a
1357 // weak definition, and the regular object refers to the weak
1358 // definition, we have to put both the weak definition and the
1359 // strong definition into the dynamic symbol table. Given a weak
1360 // definition, the only way that we can find the corresponding
1361 // strong definition, if any, is to search the symbol table.
1362 std::vector<Sized_symbol<size>*> object_symbols;
1364 const unsigned char* p = syms;
1365 const unsigned char* vs = versym;
1366 for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2)
1368 elfcpp::Sym<size, big_endian> sym(p);
1370 if (sympointers != NULL)
1371 (*sympointers)[i] = NULL;
1373 // Ignore symbols with local binding or that have
1374 // internal or hidden visibility.
1375 if (sym.get_st_bind() == elfcpp::STB_LOCAL
1376 || sym.get_st_visibility() == elfcpp::STV_INTERNAL
1377 || sym.get_st_visibility() == elfcpp::STV_HIDDEN)
1380 // A protected symbol in a shared library must be treated as a
1381 // normal symbol when viewed from outside the shared library.
1382 // Implement this by overriding the visibility here.
1383 elfcpp::Sym<size, big_endian>* psym = &sym;
1384 unsigned char symbuf[sym_size];
1385 elfcpp::Sym<size, big_endian> sym2(symbuf);
1386 if (sym.get_st_visibility() == elfcpp::STV_PROTECTED)
1388 memcpy(symbuf, p, sym_size);
1389 elfcpp::Sym_write<size, big_endian> sw(symbuf);
1390 sw.put_st_other(elfcpp::STV_DEFAULT, sym.get_st_nonvis());
1394 unsigned int st_name = psym->get_st_name();
1395 if (st_name >= sym_name_size)
1397 dynobj->error(_("bad symbol name offset %u at %zu"),
1402 const char* name = sym_names + st_name;
1405 unsigned int st_shndx = dynobj->adjust_sym_shndx(i, psym->get_st_shndx(),
1408 if (st_shndx != elfcpp::SHN_UNDEF)
1411 Sized_symbol<size>* res;
1415 Stringpool::Key name_key;
1416 name = this->namepool_.add(name, true, &name_key);
1417 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
1418 false, *psym, st_shndx, is_ordinary,
1423 // Read the version information.
1425 unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs);
1427 bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0;
1428 v &= elfcpp::VERSYM_VERSION;
1430 // The Sun documentation says that V can be VER_NDX_LOCAL,
1431 // or VER_NDX_GLOBAL, or a version index. The meaning of
1432 // VER_NDX_LOCAL is defined as "Symbol has local scope."
1433 // The old GNU linker will happily generate VER_NDX_LOCAL
1434 // for an undefined symbol. I don't know what the Sun
1435 // linker will generate.
1437 if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL)
1438 && st_shndx != elfcpp::SHN_UNDEF)
1440 // This symbol should not be visible outside the object.
1444 // At this point we are definitely going to add this symbol.
1445 Stringpool::Key name_key;
1446 name = this->namepool_.add(name, true, &name_key);
1448 if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL)
1449 || v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL))
1451 // This symbol does not have a version.
1452 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
1453 false, *psym, st_shndx, is_ordinary,
1458 if (v >= version_map->size())
1460 dynobj->error(_("versym for symbol %zu out of range: %u"),
1465 const char* version = (*version_map)[v];
1466 if (version == NULL)
1468 dynobj->error(_("versym for symbol %zu has no name: %u"),
1473 Stringpool::Key version_key;
1474 version = this->namepool_.add(version, true, &version_key);
1476 // If this is an absolute symbol, and the version name
1477 // and symbol name are the same, then this is the
1478 // version definition symbol. These symbols exist to
1479 // support using -u to pull in particular versions. We
1480 // do not want to record a version for them.
1481 if (st_shndx == elfcpp::SHN_ABS
1483 && name_key == version_key)
1484 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
1485 false, *psym, st_shndx, is_ordinary,
1489 const bool is_default_version =
1490 !hidden && st_shndx != elfcpp::SHN_UNDEF;
1491 res = this->add_from_object(dynobj, name, name_key, version,
1492 version_key, is_default_version,
1494 is_ordinary, st_shndx);
1499 // Note that it is possible that RES was overridden by an
1500 // earlier object, in which case it can't be aliased here.
1501 if (st_shndx != elfcpp::SHN_UNDEF
1503 && psym->get_st_type() == elfcpp::STT_OBJECT
1504 && res->source() == Symbol::FROM_OBJECT
1505 && res->object() == dynobj)
1506 object_symbols.push_back(res);
1508 if (sympointers != NULL)
1509 (*sympointers)[i] = res;
1512 this->record_weak_aliases(&object_symbols);
1515 // Add a symbol from a incremental object file.
1517 template<int size, bool big_endian>
1519 Symbol_table::add_from_incrobj(
1523 elfcpp::Sym<size, big_endian>* sym)
1525 unsigned int st_shndx = sym->get_st_shndx();
1526 bool is_ordinary = st_shndx < elfcpp::SHN_LORESERVE;
1528 Stringpool::Key ver_key = 0;
1529 bool is_default_version = false;
1530 bool is_forced_local = false;
1532 Stringpool::Key name_key;
1533 name = this->namepool_.add(name, true, &name_key);
1535 Sized_symbol<size>* res;
1536 res = this->add_from_object(obj, name, name_key, ver, ver_key,
1537 is_default_version, *sym, st_shndx,
1538 is_ordinary, st_shndx);
1540 if (is_forced_local)
1541 this->force_local(res);
1546 // This is used to sort weak aliases. We sort them first by section
1547 // index, then by offset, then by weak ahead of strong.
1550 class Weak_alias_sorter
1553 bool operator()(const Sized_symbol<size>*, const Sized_symbol<size>*) const;
1558 Weak_alias_sorter<size>::operator()(const Sized_symbol<size>* s1,
1559 const Sized_symbol<size>* s2) const
1562 unsigned int s1_shndx = s1->shndx(&is_ordinary);
1563 gold_assert(is_ordinary);
1564 unsigned int s2_shndx = s2->shndx(&is_ordinary);
1565 gold_assert(is_ordinary);
1566 if (s1_shndx != s2_shndx)
1567 return s1_shndx < s2_shndx;
1569 if (s1->value() != s2->value())
1570 return s1->value() < s2->value();
1571 if (s1->binding() != s2->binding())
1573 if (s1->binding() == elfcpp::STB_WEAK)
1575 if (s2->binding() == elfcpp::STB_WEAK)
1578 return std::string(s1->name()) < std::string(s2->name());
1581 // SYMBOLS is a list of object symbols from a dynamic object. Look
1582 // for any weak aliases, and record them so that if we add the weak
1583 // alias to the dynamic symbol table, we also add the corresponding
1588 Symbol_table::record_weak_aliases(std::vector<Sized_symbol<size>*>* symbols)
1590 // Sort the vector by section index, then by offset, then by weak
1592 std::sort(symbols->begin(), symbols->end(), Weak_alias_sorter<size>());
1594 // Walk through the vector. For each weak definition, record
1596 for (typename std::vector<Sized_symbol<size>*>::const_iterator p =
1598 p != symbols->end();
1601 if ((*p)->binding() != elfcpp::STB_WEAK)
1604 // Build a circular list of weak aliases. Each symbol points to
1605 // the next one in the circular list.
1607 Sized_symbol<size>* from_sym = *p;
1608 typename std::vector<Sized_symbol<size>*>::const_iterator q;
1609 for (q = p + 1; q != symbols->end(); ++q)
1612 if ((*q)->shndx(&dummy) != from_sym->shndx(&dummy)
1613 || (*q)->value() != from_sym->value())
1616 this->weak_aliases_[from_sym] = *q;
1617 from_sym->set_has_alias();
1623 this->weak_aliases_[from_sym] = *p;
1624 from_sym->set_has_alias();
1631 // Create and return a specially defined symbol. If ONLY_IF_REF is
1632 // true, then only create the symbol if there is a reference to it.
1633 // If this does not return NULL, it sets *POLDSYM to the existing
1634 // symbol if there is one. This sets *RESOLVE_OLDSYM if we should
1635 // resolve the newly created symbol to the old one. This
1636 // canonicalizes *PNAME and *PVERSION.
1638 template<int size, bool big_endian>
1640 Symbol_table::define_special_symbol(const char** pname, const char** pversion,
1642 Sized_symbol<size>** poldsym,
1643 bool* resolve_oldsym)
1645 *resolve_oldsym = false;
1647 // If the caller didn't give us a version, see if we get one from
1648 // the version script.
1650 bool is_default_version = false;
1651 if (*pversion == NULL)
1654 if (this->version_script_.get_symbol_version(*pname, &v, &is_global))
1656 if (is_global && !v.empty())
1658 *pversion = v.c_str();
1659 // If we get the version from a version script, then we
1660 // are also the default version.
1661 is_default_version = true;
1667 Sized_symbol<size>* sym;
1669 bool add_to_table = false;
1670 typename Symbol_table_type::iterator add_loc = this->table_.end();
1671 bool add_def_to_table = false;
1672 typename Symbol_table_type::iterator add_def_loc = this->table_.end();
1676 oldsym = this->lookup(*pname, *pversion);
1677 if (oldsym == NULL && is_default_version)
1678 oldsym = this->lookup(*pname, NULL);
1679 if (oldsym == NULL || !oldsym->is_undefined())
1682 *pname = oldsym->name();
1683 if (!is_default_version)
1684 *pversion = oldsym->version();
1688 // Canonicalize NAME and VERSION.
1689 Stringpool::Key name_key;
1690 *pname = this->namepool_.add(*pname, true, &name_key);
1692 Stringpool::Key version_key = 0;
1693 if (*pversion != NULL)
1694 *pversion = this->namepool_.add(*pversion, true, &version_key);
1696 Symbol* const snull = NULL;
1697 std::pair<typename Symbol_table_type::iterator, bool> ins =
1698 this->table_.insert(std::make_pair(std::make_pair(name_key,
1702 std::pair<typename Symbol_table_type::iterator, bool> insdefault =
1703 std::make_pair(this->table_.end(), false);
1704 if (is_default_version)
1706 const Stringpool::Key vnull = 0;
1708 this->table_.insert(std::make_pair(std::make_pair(name_key,
1715 // We already have a symbol table entry for NAME/VERSION.
1716 oldsym = ins.first->second;
1717 gold_assert(oldsym != NULL);
1719 if (is_default_version)
1721 Sized_symbol<size>* soldsym =
1722 this->get_sized_symbol<size>(oldsym);
1723 this->define_default_version<size, big_endian>(soldsym,
1730 // We haven't seen this symbol before.
1731 gold_assert(ins.first->second == NULL);
1733 add_to_table = true;
1734 add_loc = ins.first;
1736 if (is_default_version && !insdefault.second)
1738 // We are adding NAME/VERSION, and it is the default
1739 // version. We already have an entry for NAME/NULL.
1740 oldsym = insdefault.first->second;
1741 *resolve_oldsym = true;
1747 if (is_default_version)
1749 add_def_to_table = true;
1750 add_def_loc = insdefault.first;
1756 const Target& target = parameters->target();
1757 if (!target.has_make_symbol())
1758 sym = new Sized_symbol<size>();
1761 Sized_target<size, big_endian>* sized_target =
1762 parameters->sized_target<size, big_endian>();
1763 sym = sized_target->make_symbol();
1769 add_loc->second = sym;
1771 gold_assert(oldsym != NULL);
1773 if (add_def_to_table)
1774 add_def_loc->second = sym;
1776 *poldsym = this->get_sized_symbol<size>(oldsym);
1781 // Define a symbol based on an Output_data.
1784 Symbol_table::define_in_output_data(const char* name,
1785 const char* version,
1791 elfcpp::STB binding,
1792 elfcpp::STV visibility,
1793 unsigned char nonvis,
1794 bool offset_is_from_end,
1797 if (parameters->target().get_size() == 32)
1799 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1800 return this->do_define_in_output_data<32>(name, version, defined, od,
1801 value, symsize, type, binding,
1809 else if (parameters->target().get_size() == 64)
1811 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1812 return this->do_define_in_output_data<64>(name, version, defined, od,
1813 value, symsize, type, binding,
1825 // Define a symbol in an Output_data, sized version.
1829 Symbol_table::do_define_in_output_data(
1831 const char* version,
1834 typename elfcpp::Elf_types<size>::Elf_Addr value,
1835 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
1837 elfcpp::STB binding,
1838 elfcpp::STV visibility,
1839 unsigned char nonvis,
1840 bool offset_is_from_end,
1843 Sized_symbol<size>* sym;
1844 Sized_symbol<size>* oldsym;
1845 bool resolve_oldsym;
1847 if (parameters->target().is_big_endian())
1849 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
1850 sym = this->define_special_symbol<size, true>(&name, &version,
1851 only_if_ref, &oldsym,
1859 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
1860 sym = this->define_special_symbol<size, false>(&name, &version,
1861 only_if_ref, &oldsym,
1871 sym->init_output_data(name, version, od, value, symsize, type, binding,
1872 visibility, nonvis, offset_is_from_end,
1873 defined == PREDEFINED);
1877 if (binding == elfcpp::STB_LOCAL
1878 || this->version_script_.symbol_is_local(name))
1879 this->force_local(sym);
1880 else if (version != NULL)
1881 sym->set_is_default();
1885 if (Symbol_table::should_override_with_special(oldsym, defined))
1886 this->override_with_special(oldsym, sym);
1897 // Define a symbol based on an Output_segment.
1900 Symbol_table::define_in_output_segment(const char* name,
1901 const char* version,
1907 elfcpp::STB binding,
1908 elfcpp::STV visibility,
1909 unsigned char nonvis,
1910 Symbol::Segment_offset_base offset_base,
1913 if (parameters->target().get_size() == 32)
1915 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1916 return this->do_define_in_output_segment<32>(name, version, defined, os,
1917 value, symsize, type,
1918 binding, visibility, nonvis,
1919 offset_base, only_if_ref);
1924 else if (parameters->target().get_size() == 64)
1926 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1927 return this->do_define_in_output_segment<64>(name, version, defined, os,
1928 value, symsize, type,
1929 binding, visibility, nonvis,
1930 offset_base, only_if_ref);
1939 // Define a symbol in an Output_segment, sized version.
1943 Symbol_table::do_define_in_output_segment(
1945 const char* version,
1948 typename elfcpp::Elf_types<size>::Elf_Addr value,
1949 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
1951 elfcpp::STB binding,
1952 elfcpp::STV visibility,
1953 unsigned char nonvis,
1954 Symbol::Segment_offset_base offset_base,
1957 Sized_symbol<size>* sym;
1958 Sized_symbol<size>* oldsym;
1959 bool resolve_oldsym;
1961 if (parameters->target().is_big_endian())
1963 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
1964 sym = this->define_special_symbol<size, true>(&name, &version,
1965 only_if_ref, &oldsym,
1973 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
1974 sym = this->define_special_symbol<size, false>(&name, &version,
1975 only_if_ref, &oldsym,
1985 sym->init_output_segment(name, version, os, value, symsize, type, binding,
1986 visibility, nonvis, offset_base,
1987 defined == PREDEFINED);
1991 if (binding == elfcpp::STB_LOCAL
1992 || this->version_script_.symbol_is_local(name))
1993 this->force_local(sym);
1994 else if (version != NULL)
1995 sym->set_is_default();
1999 if (Symbol_table::should_override_with_special(oldsym, defined))
2000 this->override_with_special(oldsym, sym);
2011 // Define a special symbol with a constant value. It is a multiple
2012 // definition error if this symbol is already defined.
2015 Symbol_table::define_as_constant(const char* name,
2016 const char* version,
2021 elfcpp::STB binding,
2022 elfcpp::STV visibility,
2023 unsigned char nonvis,
2025 bool force_override)
2027 if (parameters->target().get_size() == 32)
2029 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2030 return this->do_define_as_constant<32>(name, version, defined, value,
2031 symsize, type, binding,
2032 visibility, nonvis, only_if_ref,
2038 else if (parameters->target().get_size() == 64)
2040 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2041 return this->do_define_as_constant<64>(name, version, defined, value,
2042 symsize, type, binding,
2043 visibility, nonvis, only_if_ref,
2053 // Define a symbol as a constant, sized version.
2057 Symbol_table::do_define_as_constant(
2059 const char* version,
2061 typename elfcpp::Elf_types<size>::Elf_Addr value,
2062 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
2064 elfcpp::STB binding,
2065 elfcpp::STV visibility,
2066 unsigned char nonvis,
2068 bool force_override)
2070 Sized_symbol<size>* sym;
2071 Sized_symbol<size>* oldsym;
2072 bool resolve_oldsym;
2074 if (parameters->target().is_big_endian())
2076 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2077 sym = this->define_special_symbol<size, true>(&name, &version,
2078 only_if_ref, &oldsym,
2086 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2087 sym = this->define_special_symbol<size, false>(&name, &version,
2088 only_if_ref, &oldsym,
2098 sym->init_constant(name, version, value, symsize, type, binding, visibility,
2099 nonvis, defined == PREDEFINED);
2103 // Version symbols are absolute symbols with name == version.
2104 // We don't want to force them to be local.
2105 if ((version == NULL
2108 && (binding == elfcpp::STB_LOCAL
2109 || this->version_script_.symbol_is_local(name)))
2110 this->force_local(sym);
2111 else if (version != NULL
2112 && (name != version || value != 0))
2113 sym->set_is_default();
2118 || Symbol_table::should_override_with_special(oldsym, defined))
2119 this->override_with_special(oldsym, sym);
2130 // Define a set of symbols in output sections.
2133 Symbol_table::define_symbols(const Layout* layout, int count,
2134 const Define_symbol_in_section* p,
2137 for (int i = 0; i < count; ++i, ++p)
2139 Output_section* os = layout->find_output_section(p->output_section);
2141 this->define_in_output_data(p->name, NULL, PREDEFINED, os, p->value,
2142 p->size, p->type, p->binding,
2143 p->visibility, p->nonvis,
2144 p->offset_is_from_end,
2145 only_if_ref || p->only_if_ref);
2147 this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size,
2148 p->type, p->binding, p->visibility, p->nonvis,
2149 only_if_ref || p->only_if_ref,
2154 // Define a set of symbols in output segments.
2157 Symbol_table::define_symbols(const Layout* layout, int count,
2158 const Define_symbol_in_segment* p,
2161 for (int i = 0; i < count; ++i, ++p)
2163 Output_segment* os = layout->find_output_segment(p->segment_type,
2164 p->segment_flags_set,
2165 p->segment_flags_clear);
2167 this->define_in_output_segment(p->name, NULL, PREDEFINED, os, p->value,
2168 p->size, p->type, p->binding,
2169 p->visibility, p->nonvis,
2171 only_if_ref || p->only_if_ref);
2173 this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size,
2174 p->type, p->binding, p->visibility, p->nonvis,
2175 only_if_ref || p->only_if_ref,
2180 // Define CSYM using a COPY reloc. POSD is the Output_data where the
2181 // symbol should be defined--typically a .dyn.bss section. VALUE is
2182 // the offset within POSD.
2186 Symbol_table::define_with_copy_reloc(
2187 Sized_symbol<size>* csym,
2189 typename elfcpp::Elf_types<size>::Elf_Addr value)
2191 gold_assert(csym->is_from_dynobj());
2192 gold_assert(!csym->is_copied_from_dynobj());
2193 Object* object = csym->object();
2194 gold_assert(object->is_dynamic());
2195 Dynobj* dynobj = static_cast<Dynobj*>(object);
2197 // Our copied variable has to override any variable in a shared
2199 elfcpp::STB binding = csym->binding();
2200 if (binding == elfcpp::STB_WEAK)
2201 binding = elfcpp::STB_GLOBAL;
2203 this->define_in_output_data(csym->name(), csym->version(), COPY,
2204 posd, value, csym->symsize(),
2205 csym->type(), binding,
2206 csym->visibility(), csym->nonvis(),
2209 csym->set_is_copied_from_dynobj();
2210 csym->set_needs_dynsym_entry();
2212 this->copied_symbol_dynobjs_[csym] = dynobj;
2214 // We have now defined all aliases, but we have not entered them all
2215 // in the copied_symbol_dynobjs_ map.
2216 if (csym->has_alias())
2221 sym = this->weak_aliases_[sym];
2224 gold_assert(sym->output_data() == posd);
2226 sym->set_is_copied_from_dynobj();
2227 this->copied_symbol_dynobjs_[sym] = dynobj;
2232 // SYM is defined using a COPY reloc. Return the dynamic object where
2233 // the original definition was found.
2236 Symbol_table::get_copy_source(const Symbol* sym) const
2238 gold_assert(sym->is_copied_from_dynobj());
2239 Copied_symbol_dynobjs::const_iterator p =
2240 this->copied_symbol_dynobjs_.find(sym);
2241 gold_assert(p != this->copied_symbol_dynobjs_.end());
2245 // Add any undefined symbols named on the command line.
2248 Symbol_table::add_undefined_symbols_from_command_line(Layout* layout)
2250 if (parameters->options().any_undefined()
2251 || layout->script_options()->any_unreferenced())
2253 if (parameters->target().get_size() == 32)
2255 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2256 this->do_add_undefined_symbols_from_command_line<32>(layout);
2261 else if (parameters->target().get_size() == 64)
2263 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2264 this->do_add_undefined_symbols_from_command_line<64>(layout);
2276 Symbol_table::do_add_undefined_symbols_from_command_line(Layout* layout)
2278 for (options::String_set::const_iterator p =
2279 parameters->options().undefined_begin();
2280 p != parameters->options().undefined_end();
2282 this->add_undefined_symbol_from_command_line<size>(p->c_str());
2284 for (Script_options::referenced_const_iterator p =
2285 layout->script_options()->referenced_begin();
2286 p != layout->script_options()->referenced_end();
2288 this->add_undefined_symbol_from_command_line<size>(p->c_str());
2293 Symbol_table::add_undefined_symbol_from_command_line(const char* name)
2295 if (this->lookup(name) != NULL)
2298 const char* version = NULL;
2300 Sized_symbol<size>* sym;
2301 Sized_symbol<size>* oldsym;
2302 bool resolve_oldsym;
2303 if (parameters->target().is_big_endian())
2305 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2306 sym = this->define_special_symbol<size, true>(&name, &version,
2315 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2316 sym = this->define_special_symbol<size, false>(&name, &version,
2324 gold_assert(oldsym == NULL);
2326 sym->init_undefined(name, version, elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
2327 elfcpp::STV_DEFAULT, 0);
2328 ++this->saw_undefined_;
2331 // Set the dynamic symbol indexes. INDEX is the index of the first
2332 // global dynamic symbol. Pointers to the symbols are stored into the
2333 // vector SYMS. The names are added to DYNPOOL. This returns an
2334 // updated dynamic symbol index.
2337 Symbol_table::set_dynsym_indexes(unsigned int index,
2338 std::vector<Symbol*>* syms,
2339 Stringpool* dynpool,
2342 for (Symbol_table_type::iterator p = this->table_.begin();
2343 p != this->table_.end();
2346 Symbol* sym = p->second;
2348 // Note that SYM may already have a dynamic symbol index, since
2349 // some symbols appear more than once in the symbol table, with
2350 // and without a version.
2352 if (!sym->should_add_dynsym_entry(this))
2353 sym->set_dynsym_index(-1U);
2354 else if (!sym->has_dynsym_index())
2356 sym->set_dynsym_index(index);
2358 syms->push_back(sym);
2359 dynpool->add(sym->name(), false, NULL);
2361 // Record any version information.
2362 if (sym->version() != NULL)
2363 versions->record_version(this, dynpool, sym);
2365 // If the symbol is defined in a dynamic object and is
2366 // referenced in a regular object, then mark the dynamic
2367 // object as needed. This is used to implement --as-needed.
2368 if (sym->is_from_dynobj() && sym->in_reg())
2369 sym->object()->set_is_needed();
2373 // Finish up the versions. In some cases this may add new dynamic
2375 index = versions->finalize(this, index, syms);
2380 // Set the final values for all the symbols. The index of the first
2381 // global symbol in the output file is *PLOCAL_SYMCOUNT. Record the
2382 // file offset OFF. Add their names to POOL. Return the new file
2383 // offset. Update *PLOCAL_SYMCOUNT if necessary.
2386 Symbol_table::finalize(off_t off, off_t dynoff, size_t dyn_global_index,
2387 size_t dyncount, Stringpool* pool,
2388 unsigned int* plocal_symcount)
2392 gold_assert(*plocal_symcount != 0);
2393 this->first_global_index_ = *plocal_symcount;
2395 this->dynamic_offset_ = dynoff;
2396 this->first_dynamic_global_index_ = dyn_global_index;
2397 this->dynamic_count_ = dyncount;
2399 if (parameters->target().get_size() == 32)
2401 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE)
2402 ret = this->sized_finalize<32>(off, pool, plocal_symcount);
2407 else if (parameters->target().get_size() == 64)
2409 #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE)
2410 ret = this->sized_finalize<64>(off, pool, plocal_symcount);
2418 // Now that we have the final symbol table, we can reliably note
2419 // which symbols should get warnings.
2420 this->warnings_.note_warnings(this);
2425 // SYM is going into the symbol table at *PINDEX. Add the name to
2426 // POOL, update *PINDEX and *POFF.
2430 Symbol_table::add_to_final_symtab(Symbol* sym, Stringpool* pool,
2431 unsigned int* pindex, off_t* poff)
2433 sym->set_symtab_index(*pindex);
2434 if (sym->version() == NULL || !parameters->options().relocatable())
2435 pool->add(sym->name(), false, NULL);
2437 pool->add(sym->versioned_name(), true, NULL);
2439 *poff += elfcpp::Elf_sizes<size>::sym_size;
2442 // Set the final value for all the symbols. This is called after
2443 // Layout::finalize, so all the output sections have their final
2448 Symbol_table::sized_finalize(off_t off, Stringpool* pool,
2449 unsigned int* plocal_symcount)
2451 off = align_address(off, size >> 3);
2452 this->offset_ = off;
2454 unsigned int index = *plocal_symcount;
2455 const unsigned int orig_index = index;
2457 // First do all the symbols which have been forced to be local, as
2458 // they must appear before all global symbols.
2459 for (Forced_locals::iterator p = this->forced_locals_.begin();
2460 p != this->forced_locals_.end();
2464 gold_assert(sym->is_forced_local());
2465 if (this->sized_finalize_symbol<size>(sym))
2467 this->add_to_final_symtab<size>(sym, pool, &index, &off);
2472 // Now do all the remaining symbols.
2473 for (Symbol_table_type::iterator p = this->table_.begin();
2474 p != this->table_.end();
2477 Symbol* sym = p->second;
2478 if (this->sized_finalize_symbol<size>(sym))
2479 this->add_to_final_symtab<size>(sym, pool, &index, &off);
2482 this->output_count_ = index - orig_index;
2487 // Compute the final value of SYM and store status in location PSTATUS.
2488 // During relaxation, this may be called multiple times for a symbol to
2489 // compute its would-be final value in each relaxation pass.
2492 typename Sized_symbol<size>::Value_type
2493 Symbol_table::compute_final_value(
2494 const Sized_symbol<size>* sym,
2495 Compute_final_value_status* pstatus) const
2497 typedef typename Sized_symbol<size>::Value_type Value_type;
2500 switch (sym->source())
2502 case Symbol::FROM_OBJECT:
2505 unsigned int shndx = sym->shndx(&is_ordinary);
2508 && shndx != elfcpp::SHN_ABS
2509 && !Symbol::is_common_shndx(shndx))
2511 *pstatus = CFVS_UNSUPPORTED_SYMBOL_SECTION;
2515 Object* symobj = sym->object();
2516 if (symobj->is_dynamic())
2519 shndx = elfcpp::SHN_UNDEF;
2521 else if (symobj->pluginobj() != NULL)
2524 shndx = elfcpp::SHN_UNDEF;
2526 else if (shndx == elfcpp::SHN_UNDEF)
2528 else if (!is_ordinary
2529 && (shndx == elfcpp::SHN_ABS
2530 || Symbol::is_common_shndx(shndx)))
2531 value = sym->value();
2534 Relobj* relobj = static_cast<Relobj*>(symobj);
2535 Output_section* os = relobj->output_section(shndx);
2537 if (this->is_section_folded(relobj, shndx))
2539 gold_assert(os == NULL);
2540 // Get the os of the section it is folded onto.
2541 Section_id folded = this->icf_->get_folded_section(relobj,
2543 gold_assert(folded.first != NULL);
2544 Relobj* folded_obj = reinterpret_cast<Relobj*>(folded.first);
2545 unsigned folded_shndx = folded.second;
2547 os = folded_obj->output_section(folded_shndx);
2548 gold_assert(os != NULL);
2550 // Replace (relobj, shndx) with canonical ICF input section.
2551 shndx = folded_shndx;
2552 relobj = folded_obj;
2555 uint64_t secoff64 = relobj->output_section_offset(shndx);
2558 bool static_or_reloc = (parameters->doing_static_link() ||
2559 parameters->options().relocatable());
2560 gold_assert(static_or_reloc || sym->dynsym_index() == -1U);
2562 *pstatus = CFVS_NO_OUTPUT_SECTION;
2566 if (secoff64 == -1ULL)
2568 // The section needs special handling (e.g., a merge section).
2570 value = os->output_address(relobj, shndx, sym->value());
2575 convert_types<Value_type, uint64_t>(secoff64);
2576 if (sym->type() == elfcpp::STT_TLS)
2577 value = sym->value() + os->tls_offset() + secoff;
2579 value = sym->value() + os->address() + secoff;
2585 case Symbol::IN_OUTPUT_DATA:
2587 Output_data* od = sym->output_data();
2588 value = sym->value();
2589 if (sym->type() != elfcpp::STT_TLS)
2590 value += od->address();
2593 Output_section* os = od->output_section();
2594 gold_assert(os != NULL);
2595 value += os->tls_offset() + (od->address() - os->address());
2597 if (sym->offset_is_from_end())
2598 value += od->data_size();
2602 case Symbol::IN_OUTPUT_SEGMENT:
2604 Output_segment* os = sym->output_segment();
2605 value = sym->value();
2606 if (sym->type() != elfcpp::STT_TLS)
2607 value += os->vaddr();
2608 switch (sym->offset_base())
2610 case Symbol::SEGMENT_START:
2612 case Symbol::SEGMENT_END:
2613 value += os->memsz();
2615 case Symbol::SEGMENT_BSS:
2616 value += os->filesz();
2624 case Symbol::IS_CONSTANT:
2625 value = sym->value();
2628 case Symbol::IS_UNDEFINED:
2640 // Finalize the symbol SYM. This returns true if the symbol should be
2641 // added to the symbol table, false otherwise.
2645 Symbol_table::sized_finalize_symbol(Symbol* unsized_sym)
2647 typedef typename Sized_symbol<size>::Value_type Value_type;
2649 Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym);
2651 // The default version of a symbol may appear twice in the symbol
2652 // table. We only need to finalize it once.
2653 if (sym->has_symtab_index())
2658 gold_assert(!sym->has_symtab_index());
2659 sym->set_symtab_index(-1U);
2660 gold_assert(sym->dynsym_index() == -1U);
2664 // If the symbol is only present on plugin files, the plugin decided we
2666 if (!sym->in_real_elf())
2668 gold_assert(!sym->has_symtab_index());
2669 sym->set_symtab_index(-1U);
2673 // Compute final symbol value.
2674 Compute_final_value_status status;
2675 Value_type value = this->compute_final_value(sym, &status);
2681 case CFVS_UNSUPPORTED_SYMBOL_SECTION:
2684 unsigned int shndx = sym->shndx(&is_ordinary);
2685 gold_error(_("%s: unsupported symbol section 0x%x"),
2686 sym->demangled_name().c_str(), shndx);
2689 case CFVS_NO_OUTPUT_SECTION:
2690 sym->set_symtab_index(-1U);
2696 sym->set_value(value);
2698 if (parameters->options().strip_all()
2699 || !parameters->options().should_retain_symbol(sym->name()))
2701 sym->set_symtab_index(-1U);
2708 // Write out the global symbols.
2711 Symbol_table::write_globals(const Stringpool* sympool,
2712 const Stringpool* dynpool,
2713 Output_symtab_xindex* symtab_xindex,
2714 Output_symtab_xindex* dynsym_xindex,
2715 Output_file* of) const
2717 switch (parameters->size_and_endianness())
2719 #ifdef HAVE_TARGET_32_LITTLE
2720 case Parameters::TARGET_32_LITTLE:
2721 this->sized_write_globals<32, false>(sympool, dynpool, symtab_xindex,
2725 #ifdef HAVE_TARGET_32_BIG
2726 case Parameters::TARGET_32_BIG:
2727 this->sized_write_globals<32, true>(sympool, dynpool, symtab_xindex,
2731 #ifdef HAVE_TARGET_64_LITTLE
2732 case Parameters::TARGET_64_LITTLE:
2733 this->sized_write_globals<64, false>(sympool, dynpool, symtab_xindex,
2737 #ifdef HAVE_TARGET_64_BIG
2738 case Parameters::TARGET_64_BIG:
2739 this->sized_write_globals<64, true>(sympool, dynpool, symtab_xindex,
2748 // Write out the global symbols.
2750 template<int size, bool big_endian>
2752 Symbol_table::sized_write_globals(const Stringpool* sympool,
2753 const Stringpool* dynpool,
2754 Output_symtab_xindex* symtab_xindex,
2755 Output_symtab_xindex* dynsym_xindex,
2756 Output_file* of) const
2758 const Target& target = parameters->target();
2760 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
2762 const unsigned int output_count = this->output_count_;
2763 const section_size_type oview_size = output_count * sym_size;
2764 const unsigned int first_global_index = this->first_global_index_;
2765 unsigned char* psyms;
2766 if (this->offset_ == 0 || output_count == 0)
2769 psyms = of->get_output_view(this->offset_, oview_size);
2771 const unsigned int dynamic_count = this->dynamic_count_;
2772 const section_size_type dynamic_size = dynamic_count * sym_size;
2773 const unsigned int first_dynamic_global_index =
2774 this->first_dynamic_global_index_;
2775 unsigned char* dynamic_view;
2776 if (this->dynamic_offset_ == 0 || dynamic_count == 0)
2777 dynamic_view = NULL;
2779 dynamic_view = of->get_output_view(this->dynamic_offset_, dynamic_size);
2781 for (Symbol_table_type::const_iterator p = this->table_.begin();
2782 p != this->table_.end();
2785 Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second);
2787 // Possibly warn about unresolved symbols in shared libraries.
2788 this->warn_about_undefined_dynobj_symbol(sym);
2790 unsigned int sym_index = sym->symtab_index();
2791 unsigned int dynsym_index;
2792 if (dynamic_view == NULL)
2795 dynsym_index = sym->dynsym_index();
2797 if (sym_index == -1U && dynsym_index == -1U)
2799 // This symbol is not included in the output file.
2804 typename elfcpp::Elf_types<size>::Elf_Addr sym_value = sym->value();
2805 typename elfcpp::Elf_types<size>::Elf_Addr dynsym_value = sym_value;
2806 elfcpp::STB binding = sym->binding();
2807 switch (sym->source())
2809 case Symbol::FROM_OBJECT:
2812 unsigned int in_shndx = sym->shndx(&is_ordinary);
2815 && in_shndx != elfcpp::SHN_ABS
2816 && !Symbol::is_common_shndx(in_shndx))
2818 gold_error(_("%s: unsupported symbol section 0x%x"),
2819 sym->demangled_name().c_str(), in_shndx);
2824 Object* symobj = sym->object();
2825 if (symobj->is_dynamic())
2827 if (sym->needs_dynsym_value())
2828 dynsym_value = target.dynsym_value(sym);
2829 shndx = elfcpp::SHN_UNDEF;
2830 if (sym->is_undef_binding_weak())
2831 binding = elfcpp::STB_WEAK;
2833 binding = elfcpp::STB_GLOBAL;
2835 else if (symobj->pluginobj() != NULL)
2836 shndx = elfcpp::SHN_UNDEF;
2837 else if (in_shndx == elfcpp::SHN_UNDEF
2839 && (in_shndx == elfcpp::SHN_ABS
2840 || Symbol::is_common_shndx(in_shndx))))
2844 Relobj* relobj = static_cast<Relobj*>(symobj);
2845 Output_section* os = relobj->output_section(in_shndx);
2846 if (this->is_section_folded(relobj, in_shndx))
2848 // This global symbol must be written out even though
2850 // Get the os of the section it is folded onto.
2852 this->icf_->get_folded_section(relobj, in_shndx);
2853 gold_assert(folded.first !=NULL);
2854 Relobj* folded_obj =
2855 reinterpret_cast<Relobj*>(folded.first);
2856 os = folded_obj->output_section(folded.second);
2857 gold_assert(os != NULL);
2859 gold_assert(os != NULL);
2860 shndx = os->out_shndx();
2862 if (shndx >= elfcpp::SHN_LORESERVE)
2864 if (sym_index != -1U)
2865 symtab_xindex->add(sym_index, shndx);
2866 if (dynsym_index != -1U)
2867 dynsym_xindex->add(dynsym_index, shndx);
2868 shndx = elfcpp::SHN_XINDEX;
2871 // In object files symbol values are section
2873 if (parameters->options().relocatable())
2874 sym_value -= os->address();
2880 case Symbol::IN_OUTPUT_DATA:
2881 shndx = sym->output_data()->out_shndx();
2882 if (shndx >= elfcpp::SHN_LORESERVE)
2884 if (sym_index != -1U)
2885 symtab_xindex->add(sym_index, shndx);
2886 if (dynsym_index != -1U)
2887 dynsym_xindex->add(dynsym_index, shndx);
2888 shndx = elfcpp::SHN_XINDEX;
2892 case Symbol::IN_OUTPUT_SEGMENT:
2893 shndx = elfcpp::SHN_ABS;
2896 case Symbol::IS_CONSTANT:
2897 shndx = elfcpp::SHN_ABS;
2900 case Symbol::IS_UNDEFINED:
2901 shndx = elfcpp::SHN_UNDEF;
2908 if (sym_index != -1U)
2910 sym_index -= first_global_index;
2911 gold_assert(sym_index < output_count);
2912 unsigned char* ps = psyms + (sym_index * sym_size);
2913 this->sized_write_symbol<size, big_endian>(sym, sym_value, shndx,
2914 binding, sympool, ps);
2917 if (dynsym_index != -1U)
2919 dynsym_index -= first_dynamic_global_index;
2920 gold_assert(dynsym_index < dynamic_count);
2921 unsigned char* pd = dynamic_view + (dynsym_index * sym_size);
2922 this->sized_write_symbol<size, big_endian>(sym, dynsym_value, shndx,
2923 binding, dynpool, pd);
2927 of->write_output_view(this->offset_, oview_size, psyms);
2928 if (dynamic_view != NULL)
2929 of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view);
2932 // Write out the symbol SYM, in section SHNDX, to P. POOL is the
2933 // strtab holding the name.
2935 template<int size, bool big_endian>
2937 Symbol_table::sized_write_symbol(
2938 Sized_symbol<size>* sym,
2939 typename elfcpp::Elf_types<size>::Elf_Addr value,
2941 elfcpp::STB binding,
2942 const Stringpool* pool,
2943 unsigned char* p) const
2945 elfcpp::Sym_write<size, big_endian> osym(p);
2946 if (sym->version() == NULL || !parameters->options().relocatable())
2947 osym.put_st_name(pool->get_offset(sym->name()));
2949 osym.put_st_name(pool->get_offset(sym->versioned_name()));
2950 osym.put_st_value(value);
2951 // Use a symbol size of zero for undefined symbols from shared libraries.
2952 if (shndx == elfcpp::SHN_UNDEF && sym->is_from_dynobj())
2953 osym.put_st_size(0);
2955 osym.put_st_size(sym->symsize());
2956 elfcpp::STT type = sym->type();
2957 // Turn IFUNC symbols from shared libraries into normal FUNC symbols.
2958 if (type == elfcpp::STT_GNU_IFUNC
2959 && sym->is_from_dynobj())
2960 type = elfcpp::STT_FUNC;
2961 // A version script may have overridden the default binding.
2962 if (sym->is_forced_local())
2963 osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, type));
2965 osym.put_st_info(elfcpp::elf_st_info(binding, type));
2966 osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis()));
2967 osym.put_st_shndx(shndx);
2970 // Check for unresolved symbols in shared libraries. This is
2971 // controlled by the --allow-shlib-undefined option.
2973 // We only warn about libraries for which we have seen all the
2974 // DT_NEEDED entries. We don't try to track down DT_NEEDED entries
2975 // which were not seen in this link. If we didn't see a DT_NEEDED
2976 // entry, we aren't going to be able to reliably report whether the
2977 // symbol is undefined.
2979 // We also don't warn about libraries found in a system library
2980 // directory (e.g., /lib or /usr/lib); we assume that those libraries
2981 // are OK. This heuristic avoids problems on GNU/Linux, in which -ldl
2982 // can have undefined references satisfied by ld-linux.so.
2985 Symbol_table::warn_about_undefined_dynobj_symbol(Symbol* sym) const
2988 if (sym->source() == Symbol::FROM_OBJECT
2989 && sym->object()->is_dynamic()
2990 && sym->shndx(&dummy) == elfcpp::SHN_UNDEF
2991 && sym->binding() != elfcpp::STB_WEAK
2992 && !parameters->options().allow_shlib_undefined()
2993 && !parameters->target().is_defined_by_abi(sym)
2994 && !sym->object()->is_in_system_directory())
2996 // A very ugly cast.
2997 Dynobj* dynobj = static_cast<Dynobj*>(sym->object());
2998 if (!dynobj->has_unknown_needed_entries())
2999 gold_undefined_symbol(sym);
3003 // Write out a section symbol. Return the update offset.
3006 Symbol_table::write_section_symbol(const Output_section* os,
3007 Output_symtab_xindex* symtab_xindex,
3011 switch (parameters->size_and_endianness())
3013 #ifdef HAVE_TARGET_32_LITTLE
3014 case Parameters::TARGET_32_LITTLE:
3015 this->sized_write_section_symbol<32, false>(os, symtab_xindex, of,
3019 #ifdef HAVE_TARGET_32_BIG
3020 case Parameters::TARGET_32_BIG:
3021 this->sized_write_section_symbol<32, true>(os, symtab_xindex, of,
3025 #ifdef HAVE_TARGET_64_LITTLE
3026 case Parameters::TARGET_64_LITTLE:
3027 this->sized_write_section_symbol<64, false>(os, symtab_xindex, of,
3031 #ifdef HAVE_TARGET_64_BIG
3032 case Parameters::TARGET_64_BIG:
3033 this->sized_write_section_symbol<64, true>(os, symtab_xindex, of,
3042 // Write out a section symbol, specialized for size and endianness.
3044 template<int size, bool big_endian>
3046 Symbol_table::sized_write_section_symbol(const Output_section* os,
3047 Output_symtab_xindex* symtab_xindex,
3051 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
3053 unsigned char* pov = of->get_output_view(offset, sym_size);
3055 elfcpp::Sym_write<size, big_endian> osym(pov);
3056 osym.put_st_name(0);
3057 if (parameters->options().relocatable())
3058 osym.put_st_value(0);
3060 osym.put_st_value(os->address());
3061 osym.put_st_size(0);
3062 osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL,
3063 elfcpp::STT_SECTION));
3064 osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0));
3066 unsigned int shndx = os->out_shndx();
3067 if (shndx >= elfcpp::SHN_LORESERVE)
3069 symtab_xindex->add(os->symtab_index(), shndx);
3070 shndx = elfcpp::SHN_XINDEX;
3072 osym.put_st_shndx(shndx);
3074 of->write_output_view(offset, sym_size, pov);
3077 // Print statistical information to stderr. This is used for --stats.
3080 Symbol_table::print_stats() const
3082 #if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP)
3083 fprintf(stderr, _("%s: symbol table entries: %zu; buckets: %zu\n"),
3084 program_name, this->table_.size(), this->table_.bucket_count());
3086 fprintf(stderr, _("%s: symbol table entries: %zu\n"),
3087 program_name, this->table_.size());
3089 this->namepool_.print_stats("symbol table stringpool");
3092 // We check for ODR violations by looking for symbols with the same
3093 // name for which the debugging information reports that they were
3094 // defined in disjoint source locations. When comparing the source
3095 // location, we consider instances with the same base filename to be
3096 // the same. This is because different object files/shared libraries
3097 // can include the same header file using different paths, and
3098 // different optimization settings can make the line number appear to
3099 // be a couple lines off, and we don't want to report an ODR violation
3102 // This struct is used to compare line information, as returned by
3103 // Dwarf_line_info::one_addr2line. It implements a < comparison
3104 // operator used with std::sort.
3106 struct Odr_violation_compare
3109 operator()(const std::string& s1, const std::string& s2) const
3111 // Inputs should be of the form "dirname/filename:linenum" where
3112 // "dirname/" is optional. We want to compare just the filename:linenum.
3114 // Find the last '/' in each string.
3115 std::string::size_type s1begin = s1.rfind('/');
3116 std::string::size_type s2begin = s2.rfind('/');
3117 // If there was no '/' in a string, start at the beginning.
3118 if (s1begin == std::string::npos)
3120 if (s2begin == std::string::npos)
3122 return s1.compare(s1begin, std::string::npos,
3123 s2, s2begin, std::string::npos) < 0;
3127 // Returns all of the lines attached to LOC, not just the one the
3128 // instruction actually came from.
3129 std::vector<std::string>
3130 Symbol_table::linenos_from_loc(const Task* task,
3131 const Symbol_location& loc)
3133 // We need to lock the object in order to read it. This
3134 // means that we have to run in a singleton Task. If we
3135 // want to run this in a general Task for better
3136 // performance, we will need one Task for object, plus
3137 // appropriate locking to ensure that we don't conflict with
3138 // other uses of the object. Also note, one_addr2line is not
3139 // currently thread-safe.
3140 Task_lock_obj<Object> tl(task, loc.object);
3142 std::vector<std::string> result;
3143 // 16 is the size of the object-cache that one_addr2line should use.
3144 std::string canonical_result = Dwarf_line_info::one_addr2line(
3145 loc.object, loc.shndx, loc.offset, 16, &result);
3146 if (!canonical_result.empty())
3147 result.push_back(canonical_result);
3151 // OutputIterator that records if it was ever assigned to. This
3152 // allows it to be used with std::set_intersection() to check for
3153 // intersection rather than computing the intersection.
3154 struct Check_intersection
3156 Check_intersection()
3160 bool had_intersection() const
3161 { return this->value_; }
3163 Check_intersection& operator++()
3166 Check_intersection& operator*()
3169 template<typename T>
3170 Check_intersection& operator=(const T&)
3172 this->value_ = true;
3180 // Check candidate_odr_violations_ to find symbols with the same name
3181 // but apparently different definitions (different source-file/line-no
3182 // for each line assigned to the first instruction).
3185 Symbol_table::detect_odr_violations(const Task* task,
3186 const char* output_file_name) const
3188 for (Odr_map::const_iterator it = candidate_odr_violations_.begin();
3189 it != candidate_odr_violations_.end();
3192 const char* const symbol_name = it->first;
3194 std::string first_object_name;
3195 std::vector<std::string> first_object_linenos;
3197 Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator
3198 locs = it->second.begin();
3199 const Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator
3200 locs_end = it->second.end();
3201 for (; locs != locs_end && first_object_linenos.empty(); ++locs)
3203 // Save the line numbers from the first definition to
3204 // compare to the other definitions. Ideally, we'd compare
3205 // every definition to every other, but we don't want to
3206 // take O(N^2) time to do this. This shortcut may cause
3207 // false negatives that appear or disappear depending on the
3208 // link order, but it won't cause false positives.
3209 first_object_name = locs->object->name();
3210 first_object_linenos = this->linenos_from_loc(task, *locs);
3213 // Sort by Odr_violation_compare to make std::set_intersection work.
3214 std::sort(first_object_linenos.begin(), first_object_linenos.end(),
3215 Odr_violation_compare());
3217 for (; locs != locs_end; ++locs)
3219 std::vector<std::string> linenos =
3220 this->linenos_from_loc(task, *locs);
3221 // linenos will be empty if we couldn't parse the debug info.
3222 if (linenos.empty())
3224 // Sort by Odr_violation_compare to make std::set_intersection work.
3225 std::sort(linenos.begin(), linenos.end(), Odr_violation_compare());
3227 Check_intersection intersection_result =
3228 std::set_intersection(first_object_linenos.begin(),
3229 first_object_linenos.end(),
3232 Check_intersection(),
3233 Odr_violation_compare());
3234 if (!intersection_result.had_intersection())
3236 gold_warning(_("while linking %s: symbol '%s' defined in "
3237 "multiple places (possible ODR violation):"),
3238 output_file_name, demangle(symbol_name).c_str());
3239 // This only prints one location from each definition,
3240 // which may not be the location we expect to intersect
3241 // with another definition. We could print the whole
3242 // set of locations, but that seems too verbose.
3243 gold_assert(!first_object_linenos.empty());
3244 gold_assert(!linenos.empty());
3245 fprintf(stderr, _(" %s from %s\n"),
3246 first_object_linenos[0].c_str(),
3247 first_object_name.c_str());
3248 fprintf(stderr, _(" %s from %s\n"),
3250 locs->object->name().c_str());
3251 // Only print one broken pair, to avoid needing to
3252 // compare against a list of the disjoint definition
3253 // locations we've found so far. (If we kept comparing
3254 // against just the first one, we'd get a lot of
3255 // redundant complaints about the second definition
3261 // We only call one_addr2line() in this function, so we can clear its cache.
3262 Dwarf_line_info::clear_addr2line_cache();
3265 // Warnings functions.
3267 // Add a new warning.
3270 Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj,
3271 const std::string& warning)
3273 name = symtab->canonicalize_name(name);
3274 this->warnings_[name].set(obj, warning);
3277 // Look through the warnings and mark the symbols for which we should
3278 // warn. This is called during Layout::finalize when we know the
3279 // sources for all the symbols.
3282 Warnings::note_warnings(Symbol_table* symtab)
3284 for (Warning_table::iterator p = this->warnings_.begin();
3285 p != this->warnings_.end();
3288 Symbol* sym = symtab->lookup(p->first, NULL);
3290 && sym->source() == Symbol::FROM_OBJECT
3291 && sym->object() == p->second.object)
3292 sym->set_has_warning();
3296 // Issue a warning. This is called when we see a relocation against a
3297 // symbol for which has a warning.
3299 template<int size, bool big_endian>
3301 Warnings::issue_warning(const Symbol* sym,
3302 const Relocate_info<size, big_endian>* relinfo,
3303 size_t relnum, off_t reloffset) const
3305 gold_assert(sym->has_warning());
3307 // We don't want to issue a warning for a relocation against the
3308 // symbol in the same object file in which the symbol is defined.
3309 if (sym->object() == relinfo->object)
3312 Warning_table::const_iterator p = this->warnings_.find(sym->name());
3313 gold_assert(p != this->warnings_.end());
3314 gold_warning_at_location(relinfo, relnum, reloffset,
3315 "%s", p->second.text.c_str());
3318 // Instantiate the templates we need. We could use the configure
3319 // script to restrict this to only the ones needed for implemented
3322 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3325 Sized_symbol<32>::allocate_common(Output_data*, Value_type);
3328 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3331 Sized_symbol<64>::allocate_common(Output_data*, Value_type);
3334 #ifdef HAVE_TARGET_32_LITTLE
3337 Symbol_table::add_from_relobj<32, false>(
3338 Sized_relobj_file<32, false>* relobj,
3339 const unsigned char* syms,
3341 size_t symndx_offset,
3342 const char* sym_names,
3343 size_t sym_name_size,
3344 Sized_relobj_file<32, false>::Symbols* sympointers,
3348 #ifdef HAVE_TARGET_32_BIG
3351 Symbol_table::add_from_relobj<32, true>(
3352 Sized_relobj_file<32, true>* relobj,
3353 const unsigned char* syms,
3355 size_t symndx_offset,
3356 const char* sym_names,
3357 size_t sym_name_size,
3358 Sized_relobj_file<32, true>::Symbols* sympointers,
3362 #ifdef HAVE_TARGET_64_LITTLE
3365 Symbol_table::add_from_relobj<64, false>(
3366 Sized_relobj_file<64, false>* relobj,
3367 const unsigned char* syms,
3369 size_t symndx_offset,
3370 const char* sym_names,
3371 size_t sym_name_size,
3372 Sized_relobj_file<64, false>::Symbols* sympointers,
3376 #ifdef HAVE_TARGET_64_BIG
3379 Symbol_table::add_from_relobj<64, true>(
3380 Sized_relobj_file<64, true>* relobj,
3381 const unsigned char* syms,
3383 size_t symndx_offset,
3384 const char* sym_names,
3385 size_t sym_name_size,
3386 Sized_relobj_file<64, true>::Symbols* sympointers,
3390 #ifdef HAVE_TARGET_32_LITTLE
3393 Symbol_table::add_from_pluginobj<32, false>(
3394 Sized_pluginobj<32, false>* obj,
3397 elfcpp::Sym<32, false>* sym);
3400 #ifdef HAVE_TARGET_32_BIG
3403 Symbol_table::add_from_pluginobj<32, true>(
3404 Sized_pluginobj<32, true>* obj,
3407 elfcpp::Sym<32, true>* sym);
3410 #ifdef HAVE_TARGET_64_LITTLE
3413 Symbol_table::add_from_pluginobj<64, false>(
3414 Sized_pluginobj<64, false>* obj,
3417 elfcpp::Sym<64, false>* sym);
3420 #ifdef HAVE_TARGET_64_BIG
3423 Symbol_table::add_from_pluginobj<64, true>(
3424 Sized_pluginobj<64, true>* obj,
3427 elfcpp::Sym<64, true>* sym);
3430 #ifdef HAVE_TARGET_32_LITTLE
3433 Symbol_table::add_from_dynobj<32, false>(
3434 Sized_dynobj<32, false>* dynobj,
3435 const unsigned char* syms,
3437 const char* sym_names,
3438 size_t sym_name_size,
3439 const unsigned char* versym,
3441 const std::vector<const char*>* version_map,
3442 Sized_relobj_file<32, false>::Symbols* sympointers,
3446 #ifdef HAVE_TARGET_32_BIG
3449 Symbol_table::add_from_dynobj<32, true>(
3450 Sized_dynobj<32, true>* dynobj,
3451 const unsigned char* syms,
3453 const char* sym_names,
3454 size_t sym_name_size,
3455 const unsigned char* versym,
3457 const std::vector<const char*>* version_map,
3458 Sized_relobj_file<32, true>::Symbols* sympointers,
3462 #ifdef HAVE_TARGET_64_LITTLE
3465 Symbol_table::add_from_dynobj<64, false>(
3466 Sized_dynobj<64, false>* dynobj,
3467 const unsigned char* syms,
3469 const char* sym_names,
3470 size_t sym_name_size,
3471 const unsigned char* versym,
3473 const std::vector<const char*>* version_map,
3474 Sized_relobj_file<64, false>::Symbols* sympointers,
3478 #ifdef HAVE_TARGET_64_BIG
3481 Symbol_table::add_from_dynobj<64, true>(
3482 Sized_dynobj<64, true>* dynobj,
3483 const unsigned char* syms,
3485 const char* sym_names,
3486 size_t sym_name_size,
3487 const unsigned char* versym,
3489 const std::vector<const char*>* version_map,
3490 Sized_relobj_file<64, true>::Symbols* sympointers,
3494 #ifdef HAVE_TARGET_32_LITTLE
3497 Symbol_table::add_from_incrobj(
3501 elfcpp::Sym<32, false>* sym);
3504 #ifdef HAVE_TARGET_32_BIG
3507 Symbol_table::add_from_incrobj(
3511 elfcpp::Sym<32, true>* sym);
3514 #ifdef HAVE_TARGET_64_LITTLE
3517 Symbol_table::add_from_incrobj(
3521 elfcpp::Sym<64, false>* sym);
3524 #ifdef HAVE_TARGET_64_BIG
3527 Symbol_table::add_from_incrobj(
3531 elfcpp::Sym<64, true>* sym);
3534 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3537 Symbol_table::define_with_copy_reloc<32>(
3538 Sized_symbol<32>* sym,
3540 elfcpp::Elf_types<32>::Elf_Addr value);
3543 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3546 Symbol_table::define_with_copy_reloc<64>(
3547 Sized_symbol<64>* sym,
3549 elfcpp::Elf_types<64>::Elf_Addr value);
3552 #ifdef HAVE_TARGET_32_LITTLE
3555 Warnings::issue_warning<32, false>(const Symbol* sym,
3556 const Relocate_info<32, false>* relinfo,
3557 size_t relnum, off_t reloffset) const;
3560 #ifdef HAVE_TARGET_32_BIG
3563 Warnings::issue_warning<32, true>(const Symbol* sym,
3564 const Relocate_info<32, true>* relinfo,
3565 size_t relnum, off_t reloffset) const;
3568 #ifdef HAVE_TARGET_64_LITTLE
3571 Warnings::issue_warning<64, false>(const Symbol* sym,
3572 const Relocate_info<64, false>* relinfo,
3573 size_t relnum, off_t reloffset) const;
3576 #ifdef HAVE_TARGET_64_BIG
3579 Warnings::issue_warning<64, true>(const Symbol* sym,
3580 const Relocate_info<64, true>* relinfo,
3581 size_t relnum, off_t reloffset) const;
3584 } // End namespace gold.