1 // symtab.cc -- the gold symbol table
3 // Copyright (C) 2006-2015 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 dynamic in a --dynamic-list file
367 // or an --export-dynamic-symbol option, add it.
368 if (!this->is_from_dynobj()
369 && (parameters->options().in_dynamic_list(this->name())
370 || parameters->options().is_export_dynamic_symbol(this->name())))
372 if (!this->is_forced_local())
374 gold_warning(_("Cannot export local symbol '%s'"),
375 this->demangled_name().c_str());
379 // If the symbol was forced local in a version script, do not add it.
380 if (this->is_forced_local())
383 // If dynamic-list-data was specified, add any STT_OBJECT.
384 if (parameters->options().dynamic_list_data()
385 && !this->is_from_dynobj()
386 && this->type() == elfcpp::STT_OBJECT)
389 // If --dynamic-list-cpp-new was specified, add any new/delete symbol.
390 // If --dynamic-list-cpp-typeinfo was specified, add any typeinfo symbols.
391 if ((parameters->options().dynamic_list_cpp_new()
392 || parameters->options().dynamic_list_cpp_typeinfo())
393 && !this->is_from_dynobj())
395 // TODO(csilvers): We could probably figure out if we're an operator
396 // new/delete or typeinfo without the need to demangle.
397 char* demangled_name = cplus_demangle(this->name(),
398 DMGL_ANSI | DMGL_PARAMS);
399 if (demangled_name == NULL)
401 // Not a C++ symbol, so it can't satisfy these flags
403 else if (parameters->options().dynamic_list_cpp_new()
404 && (strprefix(demangled_name, "operator new")
405 || strprefix(demangled_name, "operator delete")))
407 free(demangled_name);
410 else if (parameters->options().dynamic_list_cpp_typeinfo()
411 && (strprefix(demangled_name, "typeinfo name for")
412 || strprefix(demangled_name, "typeinfo for")))
414 free(demangled_name);
418 free(demangled_name);
421 // If exporting all symbols or building a shared library,
422 // or the symbol should be globally unique (GNU_UNIQUE),
423 // and the symbol is defined in a regular object and is
424 // externally visible, we need to add it.
425 if ((parameters->options().export_dynamic()
426 || parameters->options().shared()
427 || (parameters->options().gnu_unique()
428 && this->binding() == elfcpp::STB_GNU_UNIQUE))
429 && !this->is_from_dynobj()
430 && !this->is_undefined()
431 && this->is_externally_visible())
437 // Return true if the final value of this symbol is known at link
441 Symbol::final_value_is_known() const
443 // If we are not generating an executable, then no final values are
444 // known, since they will change at runtime, with the exception of
445 // TLS symbols in a position-independent executable.
446 if ((parameters->options().output_is_position_independent()
447 || parameters->options().relocatable())
448 && !(this->type() == elfcpp::STT_TLS
449 && parameters->options().pie()))
452 // If the symbol is not from an object file, and is not undefined,
453 // then it is defined, and known.
454 if (this->source_ != FROM_OBJECT)
456 if (this->source_ != IS_UNDEFINED)
461 // If the symbol is from a dynamic object, then the final value
463 if (this->object()->is_dynamic())
466 // If the symbol is not undefined (it is defined or common),
467 // then the final value is known.
468 if (!this->is_undefined())
472 // If the symbol is undefined, then whether the final value is known
473 // depends on whether we are doing a static link. If we are doing a
474 // dynamic link, then the final value could be filled in at runtime.
475 // This could reasonably be the case for a weak undefined symbol.
476 return parameters->doing_static_link();
479 // Return the output section where this symbol is defined.
482 Symbol::output_section() const
484 switch (this->source_)
488 unsigned int shndx = this->u_.from_object.shndx;
489 if (shndx != elfcpp::SHN_UNDEF && this->is_ordinary_shndx_)
491 gold_assert(!this->u_.from_object.object->is_dynamic());
492 gold_assert(this->u_.from_object.object->pluginobj() == NULL);
493 Relobj* relobj = static_cast<Relobj*>(this->u_.from_object.object);
494 return relobj->output_section(shndx);
500 return this->u_.in_output_data.output_data->output_section();
502 case IN_OUTPUT_SEGMENT:
512 // Set the symbol's output section. This is used for symbols defined
513 // in scripts. This should only be called after the symbol table has
517 Symbol::set_output_section(Output_section* os)
519 switch (this->source_)
523 gold_assert(this->output_section() == os);
526 this->source_ = IN_OUTPUT_DATA;
527 this->u_.in_output_data.output_data = os;
528 this->u_.in_output_data.offset_is_from_end = false;
530 case IN_OUTPUT_SEGMENT:
537 // Set the symbol's output segment. This is used for pre-defined
538 // symbols whose segments aren't known until after layout is done
539 // (e.g., __ehdr_start).
542 Symbol::set_output_segment(Output_segment* os, Segment_offset_base base)
544 gold_assert(this->is_predefined_);
545 this->source_ = IN_OUTPUT_SEGMENT;
546 this->u_.in_output_segment.output_segment = os;
547 this->u_.in_output_segment.offset_base = base;
550 // Set the symbol to undefined. This is used for pre-defined
551 // symbols whose segments aren't known until after layout is done
552 // (e.g., __ehdr_start).
555 Symbol::set_undefined()
557 this->source_ = IS_UNDEFINED;
558 this->is_predefined_ = false;
561 // Class Symbol_table.
563 Symbol_table::Symbol_table(unsigned int count,
564 const Version_script_info& version_script)
565 : saw_undefined_(0), offset_(0), table_(count), namepool_(),
566 forwarders_(), commons_(), tls_commons_(), small_commons_(),
567 large_commons_(), forced_locals_(), warnings_(),
568 version_script_(version_script), gc_(NULL), icf_(NULL)
570 namepool_.reserve(count);
573 Symbol_table::~Symbol_table()
577 // The symbol table key equality function. This is called with
581 Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1,
582 const Symbol_table_key& k2) const
584 return k1.first == k2.first && k1.second == k2.second;
588 Symbol_table::is_section_folded(Relobj* obj, unsigned int shndx) const
590 return (parameters->options().icf_enabled()
591 && this->icf_->is_section_folded(obj, shndx));
594 // For symbols that have been listed with a -u or --export-dynamic-symbol
595 // option, add them to the work list to avoid gc'ing them.
598 Symbol_table::gc_mark_undef_symbols(Layout* layout)
600 for (options::String_set::const_iterator p =
601 parameters->options().undefined_begin();
602 p != parameters->options().undefined_end();
605 const char* name = p->c_str();
606 Symbol* sym = this->lookup(name);
607 gold_assert(sym != NULL);
608 if (sym->source() == Symbol::FROM_OBJECT
609 && !sym->object()->is_dynamic())
611 this->gc_mark_symbol(sym);
615 for (options::String_set::const_iterator p =
616 parameters->options().export_dynamic_symbol_begin();
617 p != parameters->options().export_dynamic_symbol_end();
620 const char* name = p->c_str();
621 Symbol* sym = this->lookup(name);
622 // It's not an error if a symbol named by --export-dynamic-symbol
625 && sym->source() == Symbol::FROM_OBJECT
626 && !sym->object()->is_dynamic())
628 this->gc_mark_symbol(sym);
632 for (Script_options::referenced_const_iterator p =
633 layout->script_options()->referenced_begin();
634 p != layout->script_options()->referenced_end();
637 Symbol* sym = this->lookup(p->c_str());
638 gold_assert(sym != NULL);
639 if (sym->source() == Symbol::FROM_OBJECT
640 && !sym->object()->is_dynamic())
642 this->gc_mark_symbol(sym);
648 Symbol_table::gc_mark_symbol(Symbol* sym)
650 // Add the object and section to the work list.
652 unsigned int shndx = sym->shndx(&is_ordinary);
653 if (is_ordinary && shndx != elfcpp::SHN_UNDEF && !sym->object()->is_dynamic())
655 gold_assert(this->gc_!= NULL);
656 Relobj* relobj = static_cast<Relobj*>(sym->object());
657 this->gc_->worklist().push_back(Section_id(relobj, shndx));
659 parameters->target().gc_mark_symbol(this, sym);
662 // When doing garbage collection, keep symbols that have been seen in
665 Symbol_table::gc_mark_dyn_syms(Symbol* sym)
667 if (sym->in_dyn() && sym->source() == Symbol::FROM_OBJECT
668 && !sym->object()->is_dynamic())
669 this->gc_mark_symbol(sym);
672 // Make TO a symbol which forwards to FROM.
675 Symbol_table::make_forwarder(Symbol* from, Symbol* to)
677 gold_assert(from != to);
678 gold_assert(!from->is_forwarder() && !to->is_forwarder());
679 this->forwarders_[from] = to;
680 from->set_forwarder();
683 // Resolve the forwards from FROM, returning the real symbol.
686 Symbol_table::resolve_forwards(const Symbol* from) const
688 gold_assert(from->is_forwarder());
689 Unordered_map<const Symbol*, Symbol*>::const_iterator p =
690 this->forwarders_.find(from);
691 gold_assert(p != this->forwarders_.end());
695 // Look up a symbol by name.
698 Symbol_table::lookup(const char* name, const char* version) const
700 Stringpool::Key name_key;
701 name = this->namepool_.find(name, &name_key);
705 Stringpool::Key version_key = 0;
708 version = this->namepool_.find(version, &version_key);
713 Symbol_table_key key(name_key, version_key);
714 Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key);
715 if (p == this->table_.end())
720 // Resolve a Symbol with another Symbol. This is only used in the
721 // unusual case where there are references to both an unversioned
722 // symbol and a symbol with a version, and we then discover that that
723 // version is the default version. Because this is unusual, we do
724 // this the slow way, by converting back to an ELF symbol.
726 template<int size, bool big_endian>
728 Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from)
730 unsigned char buf[elfcpp::Elf_sizes<size>::sym_size];
731 elfcpp::Sym_write<size, big_endian> esym(buf);
732 // We don't bother to set the st_name or the st_shndx field.
733 esym.put_st_value(from->value());
734 esym.put_st_size(from->symsize());
735 esym.put_st_info(from->binding(), from->type());
736 esym.put_st_other(from->visibility(), from->nonvis());
738 unsigned int shndx = from->shndx(&is_ordinary);
739 this->resolve(to, esym.sym(), shndx, is_ordinary, shndx, from->object(),
740 from->version(), true);
745 if (parameters->options().gc_sections())
746 this->gc_mark_dyn_syms(to);
749 // Record that a symbol is forced to be local by a version script or
753 Symbol_table::force_local(Symbol* sym)
755 if (!sym->is_defined() && !sym->is_common())
757 if (sym->is_forced_local())
759 // We already got this one.
762 sym->set_is_forced_local();
763 this->forced_locals_.push_back(sym);
766 // Adjust NAME for wrapping, and update *NAME_KEY if necessary. This
767 // is only called for undefined symbols, when at least one --wrap
771 Symbol_table::wrap_symbol(const char* name, Stringpool::Key* name_key)
773 // For some targets, we need to ignore a specific character when
774 // wrapping, and add it back later.
776 if (name[0] == parameters->target().wrap_char())
782 if (parameters->options().is_wrap(name))
784 // Turn NAME into __wrap_NAME.
791 // This will give us both the old and new name in NAMEPOOL_, but
792 // that is OK. Only the versions we need will wind up in the
793 // real string table in the output file.
794 return this->namepool_.add(s.c_str(), true, name_key);
797 const char* const real_prefix = "__real_";
798 const size_t real_prefix_length = strlen(real_prefix);
799 if (strncmp(name, real_prefix, real_prefix_length) == 0
800 && parameters->options().is_wrap(name + real_prefix_length))
802 // Turn __real_NAME into NAME.
806 s += name + real_prefix_length;
807 return this->namepool_.add(s.c_str(), true, name_key);
813 // This is called when we see a symbol NAME/VERSION, and the symbol
814 // already exists in the symbol table, and VERSION is marked as being
815 // the default version. SYM is the NAME/VERSION symbol we just added.
816 // DEFAULT_IS_NEW is true if this is the first time we have seen the
817 // symbol NAME/NULL. PDEF points to the entry for NAME/NULL.
819 template<int size, bool big_endian>
821 Symbol_table::define_default_version(Sized_symbol<size>* sym,
823 Symbol_table_type::iterator pdef)
827 // This is the first time we have seen NAME/NULL. Make
828 // NAME/NULL point to NAME/VERSION, and mark SYM as the default
831 sym->set_is_default();
833 else if (pdef->second == sym)
835 // NAME/NULL already points to NAME/VERSION. Don't mark the
836 // symbol as the default if it is not already the default.
840 // This is the unfortunate case where we already have entries
841 // for both NAME/VERSION and NAME/NULL. We now see a symbol
842 // NAME/VERSION where VERSION is the default version. We have
843 // already resolved this new symbol with the existing
844 // NAME/VERSION symbol.
846 // It's possible that NAME/NULL and NAME/VERSION are both
847 // defined in regular objects. This can only happen if one
848 // object file defines foo and another defines foo@@ver. This
849 // is somewhat obscure, but we call it a multiple definition
852 // It's possible that NAME/NULL actually has a version, in which
853 // case it won't be the same as VERSION. This happens with
854 // ver_test_7.so in the testsuite for the symbol t2_2. We see
855 // t2_2@@VER2, so we define both t2_2/VER2 and t2_2/NULL. We
856 // then see an unadorned t2_2 in an object file and give it
857 // version VER1 from the version script. This looks like a
858 // default definition for VER1, so it looks like we should merge
859 // t2_2/NULL with t2_2/VER1. That doesn't make sense, but it's
860 // not obvious that this is an error, either. So we just punt.
862 // If one of the symbols has non-default visibility, and the
863 // other is defined in a shared object, then they are different
866 // Otherwise, we just resolve the symbols as though they were
869 if (pdef->second->version() != NULL)
870 gold_assert(pdef->second->version() != sym->version());
871 else if (sym->visibility() != elfcpp::STV_DEFAULT
872 && pdef->second->is_from_dynobj())
874 else if (pdef->second->visibility() != elfcpp::STV_DEFAULT
875 && sym->is_from_dynobj())
879 const Sized_symbol<size>* symdef;
880 symdef = this->get_sized_symbol<size>(pdef->second);
881 Symbol_table::resolve<size, big_endian>(sym, symdef);
882 this->make_forwarder(pdef->second, sym);
884 sym->set_is_default();
889 // Add one symbol from OBJECT to the symbol table. NAME is symbol
890 // name and VERSION is the version; both are canonicalized. DEF is
891 // whether this is the default version. ST_SHNDX is the symbol's
892 // section index; IS_ORDINARY is whether this is a normal section
893 // rather than a special code.
895 // If IS_DEFAULT_VERSION is true, then this is the definition of a
896 // default version of a symbol. That means that any lookup of
897 // NAME/NULL and any lookup of NAME/VERSION should always return the
898 // same symbol. This is obvious for references, but in particular we
899 // want to do this for definitions: overriding NAME/NULL should also
900 // override NAME/VERSION. If we don't do that, it would be very hard
901 // to override functions in a shared library which uses versioning.
903 // We implement this by simply making both entries in the hash table
904 // point to the same Symbol structure. That is easy enough if this is
905 // the first time we see NAME/NULL or NAME/VERSION, but it is possible
906 // that we have seen both already, in which case they will both have
907 // independent entries in the symbol table. We can't simply change
908 // the symbol table entry, because we have pointers to the entries
909 // attached to the object files. So we mark the entry attached to the
910 // object file as a forwarder, and record it in the forwarders_ map.
911 // Note that entries in the hash table will never be marked as
914 // ORIG_ST_SHNDX and ST_SHNDX are almost always the same.
915 // ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF
916 // for a special section code. ST_SHNDX may be modified if the symbol
917 // is defined in a section being discarded.
919 template<int size, bool big_endian>
921 Symbol_table::add_from_object(Object* object,
923 Stringpool::Key name_key,
925 Stringpool::Key version_key,
926 bool is_default_version,
927 const elfcpp::Sym<size, big_endian>& sym,
928 unsigned int st_shndx,
930 unsigned int orig_st_shndx)
932 // Print a message if this symbol is being traced.
933 if (parameters->options().is_trace_symbol(name))
935 if (orig_st_shndx == elfcpp::SHN_UNDEF)
936 gold_info(_("%s: reference to %s"), object->name().c_str(), name);
938 gold_info(_("%s: definition of %s"), object->name().c_str(), name);
941 // For an undefined symbol, we may need to adjust the name using
943 if (orig_st_shndx == elfcpp::SHN_UNDEF
944 && parameters->options().any_wrap())
946 const char* wrap_name = this->wrap_symbol(name, &name_key);
947 if (wrap_name != name)
949 // If we see a reference to malloc with version GLIBC_2.0,
950 // and we turn it into a reference to __wrap_malloc, then we
951 // discard the version number. Otherwise the user would be
952 // required to specify the correct version for
960 Symbol* const snull = NULL;
961 std::pair<typename Symbol_table_type::iterator, bool> ins =
962 this->table_.insert(std::make_pair(std::make_pair(name_key, version_key),
965 std::pair<typename Symbol_table_type::iterator, bool> insdefault =
966 std::make_pair(this->table_.end(), false);
967 if (is_default_version)
969 const Stringpool::Key vnull_key = 0;
970 insdefault = this->table_.insert(std::make_pair(std::make_pair(name_key,
975 // ins.first: an iterator, which is a pointer to a pair.
976 // ins.first->first: the key (a pair of name and version).
977 // ins.first->second: the value (Symbol*).
978 // ins.second: true if new entry was inserted, false if not.
980 Sized_symbol<size>* ret;
985 // We already have an entry for NAME/VERSION.
986 ret = this->get_sized_symbol<size>(ins.first->second);
987 gold_assert(ret != NULL);
989 was_undefined = ret->is_undefined();
990 // Commons from plugins are just placeholders.
991 was_common = ret->is_common() && ret->object()->pluginobj() == NULL;
993 this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object,
994 version, is_default_version);
995 if (parameters->options().gc_sections())
996 this->gc_mark_dyn_syms(ret);
998 if (is_default_version)
999 this->define_default_version<size, big_endian>(ret, insdefault.second,
1005 && ret->source() == Symbol::FROM_OBJECT
1006 && ret->object() == object
1008 && ret->shndx(&dummy) == st_shndx
1009 && ret->is_default())
1011 // We have seen NAME/VERSION already, and marked it as the
1012 // default version, but now we see a definition for
1013 // NAME/VERSION that is not the default version. This can
1014 // happen when the assembler generates two symbols for
1015 // a symbol as a result of a ".symver foo,foo@VER"
1016 // directive. We see the first unversioned symbol and
1017 // we may mark it as the default version (from a
1018 // version script); then we see the second versioned
1019 // symbol and we need to override the first.
1020 // In any other case, the two symbols should have generated
1021 // a multiple definition error.
1022 // (See PR gold/18703.)
1023 ret->set_is_not_default();
1024 const Stringpool::Key vnull_key = 0;
1025 this->table_.erase(std::make_pair(name_key, vnull_key));
1031 // This is the first time we have seen NAME/VERSION.
1032 gold_assert(ins.first->second == NULL);
1034 if (is_default_version && !insdefault.second)
1036 // We already have an entry for NAME/NULL. If we override
1037 // it, then change it to NAME/VERSION.
1038 ret = this->get_sized_symbol<size>(insdefault.first->second);
1040 was_undefined = ret->is_undefined();
1041 // Commons from plugins are just placeholders.
1042 was_common = ret->is_common() && ret->object()->pluginobj() == NULL;
1044 this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object,
1045 version, is_default_version);
1046 if (parameters->options().gc_sections())
1047 this->gc_mark_dyn_syms(ret);
1048 ins.first->second = ret;
1052 was_undefined = false;
1055 Sized_target<size, big_endian>* target =
1056 parameters->sized_target<size, big_endian>();
1057 if (!target->has_make_symbol())
1058 ret = new Sized_symbol<size>();
1061 ret = target->make_symbol();
1064 // This means that we don't want a symbol table
1066 if (!is_default_version)
1067 this->table_.erase(ins.first);
1070 this->table_.erase(insdefault.first);
1071 // Inserting INSDEFAULT invalidated INS.
1072 this->table_.erase(std::make_pair(name_key,
1079 ret->init_object(name, version, object, sym, st_shndx, is_ordinary);
1081 ins.first->second = ret;
1082 if (is_default_version)
1084 // This is the first time we have seen NAME/NULL. Point
1085 // it at the new entry for NAME/VERSION.
1086 gold_assert(insdefault.second);
1087 insdefault.first->second = ret;
1091 if (is_default_version)
1092 ret->set_is_default();
1095 // Record every time we see a new undefined symbol, to speed up
1097 if (!was_undefined && ret->is_undefined())
1099 ++this->saw_undefined_;
1100 if (parameters->options().has_plugins())
1101 parameters->options().plugins()->new_undefined_symbol(ret);
1104 // Keep track of common symbols, to speed up common symbol
1105 // allocation. Don't record commons from plugin objects;
1106 // we need to wait until we see the real symbol in the
1107 // replacement file.
1108 if (!was_common && ret->is_common() && ret->object()->pluginobj() == NULL)
1110 if (ret->type() == elfcpp::STT_TLS)
1111 this->tls_commons_.push_back(ret);
1112 else if (!is_ordinary
1113 && st_shndx == parameters->target().small_common_shndx())
1114 this->small_commons_.push_back(ret);
1115 else if (!is_ordinary
1116 && st_shndx == parameters->target().large_common_shndx())
1117 this->large_commons_.push_back(ret);
1119 this->commons_.push_back(ret);
1122 // If we're not doing a relocatable link, then any symbol with
1123 // hidden or internal visibility is local.
1124 if ((ret->visibility() == elfcpp::STV_HIDDEN
1125 || ret->visibility() == elfcpp::STV_INTERNAL)
1126 && (ret->binding() == elfcpp::STB_GLOBAL
1127 || ret->binding() == elfcpp::STB_GNU_UNIQUE
1128 || ret->binding() == elfcpp::STB_WEAK)
1129 && !parameters->options().relocatable())
1130 this->force_local(ret);
1135 // Add all the symbols in a relocatable object to the hash table.
1137 template<int size, bool big_endian>
1139 Symbol_table::add_from_relobj(
1140 Sized_relobj_file<size, big_endian>* relobj,
1141 const unsigned char* syms,
1143 size_t symndx_offset,
1144 const char* sym_names,
1145 size_t sym_name_size,
1146 typename Sized_relobj_file<size, big_endian>::Symbols* sympointers,
1151 gold_assert(size == parameters->target().get_size());
1153 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
1155 const bool just_symbols = relobj->just_symbols();
1157 const unsigned char* p = syms;
1158 for (size_t i = 0; i < count; ++i, p += sym_size)
1160 (*sympointers)[i] = NULL;
1162 elfcpp::Sym<size, big_endian> sym(p);
1164 unsigned int st_name = sym.get_st_name();
1165 if (st_name >= sym_name_size)
1167 relobj->error(_("bad global symbol name offset %u at %zu"),
1172 const char* name = sym_names + st_name;
1174 if (!parameters->options().relocatable()
1175 && strcmp (name, "__gnu_lto_slim") == 0)
1176 gold_info(_("%s: plugin needed to handle lto object"),
1177 relobj->name().c_str());
1180 unsigned int st_shndx = relobj->adjust_sym_shndx(i + symndx_offset,
1183 unsigned int orig_st_shndx = st_shndx;
1185 orig_st_shndx = elfcpp::SHN_UNDEF;
1187 if (st_shndx != elfcpp::SHN_UNDEF)
1190 // A symbol defined in a section which we are not including must
1191 // be treated as an undefined symbol.
1192 bool is_defined_in_discarded_section = false;
1193 if (st_shndx != elfcpp::SHN_UNDEF
1195 && !relobj->is_section_included(st_shndx)
1196 && !this->is_section_folded(relobj, st_shndx))
1198 st_shndx = elfcpp::SHN_UNDEF;
1199 is_defined_in_discarded_section = true;
1202 // In an object file, an '@' in the name separates the symbol
1203 // name from the version name. If there are two '@' characters,
1204 // this is the default version.
1205 const char* ver = strchr(name, '@');
1206 Stringpool::Key ver_key = 0;
1208 // IS_DEFAULT_VERSION: is the version default?
1209 // IS_FORCED_LOCAL: is the symbol forced local?
1210 bool is_default_version = false;
1211 bool is_forced_local = false;
1213 // FIXME: For incremental links, we don't store version information,
1214 // so we need to ignore version symbols for now.
1215 if (parameters->incremental_update() && ver != NULL)
1217 namelen = ver - name;
1223 // The symbol name is of the form foo@VERSION or foo@@VERSION
1224 namelen = ver - name;
1228 is_default_version = true;
1231 ver = this->namepool_.add(ver, true, &ver_key);
1233 // We don't want to assign a version to an undefined symbol,
1234 // even if it is listed in the version script. FIXME: What
1235 // about a common symbol?
1238 namelen = strlen(name);
1239 if (!this->version_script_.empty()
1240 && st_shndx != elfcpp::SHN_UNDEF)
1242 // The symbol name did not have a version, but the
1243 // version script may assign a version anyway.
1244 std::string version;
1246 if (this->version_script_.get_symbol_version(name, &version,
1250 is_forced_local = true;
1251 else if (!version.empty())
1253 ver = this->namepool_.add_with_length(version.c_str(),
1257 is_default_version = true;
1263 elfcpp::Sym<size, big_endian>* psym = &sym;
1264 unsigned char symbuf[sym_size];
1265 elfcpp::Sym<size, big_endian> sym2(symbuf);
1268 memcpy(symbuf, p, sym_size);
1269 elfcpp::Sym_write<size, big_endian> sw(symbuf);
1270 if (orig_st_shndx != elfcpp::SHN_UNDEF
1272 && relobj->e_type() == elfcpp::ET_REL)
1274 // Symbol values in relocatable object files are section
1275 // relative. This is normally what we want, but since here
1276 // we are converting the symbol to absolute we need to add
1277 // the section address. The section address in an object
1278 // file is normally zero, but people can use a linker
1279 // script to change it.
1280 sw.put_st_value(sym.get_st_value()
1281 + relobj->section_address(orig_st_shndx));
1283 st_shndx = elfcpp::SHN_ABS;
1284 is_ordinary = false;
1288 // Fix up visibility if object has no-export set.
1289 if (relobj->no_export()
1290 && (orig_st_shndx != elfcpp::SHN_UNDEF || !is_ordinary))
1292 // We may have copied symbol already above.
1295 memcpy(symbuf, p, sym_size);
1299 elfcpp::STV visibility = sym2.get_st_visibility();
1300 if (visibility == elfcpp::STV_DEFAULT
1301 || visibility == elfcpp::STV_PROTECTED)
1303 elfcpp::Sym_write<size, big_endian> sw(symbuf);
1304 unsigned char nonvis = sym2.get_st_nonvis();
1305 sw.put_st_other(elfcpp::STV_HIDDEN, nonvis);
1309 Stringpool::Key name_key;
1310 name = this->namepool_.add_with_length(name, namelen, true,
1313 Sized_symbol<size>* res;
1314 res = this->add_from_object(relobj, name, name_key, ver, ver_key,
1315 is_default_version, *psym, st_shndx,
1316 is_ordinary, orig_st_shndx);
1318 if (is_forced_local)
1319 this->force_local(res);
1321 // Do not treat this symbol as garbage if this symbol will be
1322 // exported to the dynamic symbol table. This is true when
1323 // building a shared library or using --export-dynamic and
1324 // the symbol is externally visible.
1325 if (parameters->options().gc_sections()
1326 && res->is_externally_visible()
1327 && !res->is_from_dynobj()
1328 && (parameters->options().shared()
1329 || parameters->options().export_dynamic()
1330 || parameters->options().in_dynamic_list(res->name())))
1331 this->gc_mark_symbol(res);
1333 if (is_defined_in_discarded_section)
1334 res->set_is_defined_in_discarded_section();
1336 (*sympointers)[i] = res;
1340 // Add a symbol from a plugin-claimed file.
1342 template<int size, bool big_endian>
1344 Symbol_table::add_from_pluginobj(
1345 Sized_pluginobj<size, big_endian>* obj,
1348 elfcpp::Sym<size, big_endian>* sym)
1350 unsigned int st_shndx = sym->get_st_shndx();
1351 bool is_ordinary = st_shndx < elfcpp::SHN_LORESERVE;
1353 Stringpool::Key ver_key = 0;
1354 bool is_default_version = false;
1355 bool is_forced_local = false;
1359 ver = this->namepool_.add(ver, true, &ver_key);
1361 // We don't want to assign a version to an undefined symbol,
1362 // even if it is listed in the version script. FIXME: What
1363 // about a common symbol?
1366 if (!this->version_script_.empty()
1367 && st_shndx != elfcpp::SHN_UNDEF)
1369 // The symbol name did not have a version, but the
1370 // version script may assign a version anyway.
1371 std::string version;
1373 if (this->version_script_.get_symbol_version(name, &version,
1377 is_forced_local = true;
1378 else if (!version.empty())
1380 ver = this->namepool_.add_with_length(version.c_str(),
1384 is_default_version = true;
1390 Stringpool::Key name_key;
1391 name = this->namepool_.add(name, true, &name_key);
1393 Sized_symbol<size>* res;
1394 res = this->add_from_object(obj, name, name_key, ver, ver_key,
1395 is_default_version, *sym, st_shndx,
1396 is_ordinary, st_shndx);
1398 if (is_forced_local)
1399 this->force_local(res);
1404 // Add all the symbols in a dynamic object to the hash table.
1406 template<int size, bool big_endian>
1408 Symbol_table::add_from_dynobj(
1409 Sized_dynobj<size, big_endian>* dynobj,
1410 const unsigned char* syms,
1412 const char* sym_names,
1413 size_t sym_name_size,
1414 const unsigned char* versym,
1416 const std::vector<const char*>* version_map,
1417 typename Sized_relobj_file<size, big_endian>::Symbols* sympointers,
1422 gold_assert(size == parameters->target().get_size());
1424 if (dynobj->just_symbols())
1426 gold_error(_("--just-symbols does not make sense with a shared object"));
1430 // FIXME: For incremental links, we don't store version information,
1431 // so we need to ignore version symbols for now.
1432 if (parameters->incremental_update())
1435 if (versym != NULL && versym_size / 2 < count)
1437 dynobj->error(_("too few symbol versions"));
1441 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
1443 // We keep a list of all STT_OBJECT symbols, so that we can resolve
1444 // weak aliases. This is necessary because if the dynamic object
1445 // provides the same variable under two names, one of which is a
1446 // weak definition, and the regular object refers to the weak
1447 // definition, we have to put both the weak definition and the
1448 // strong definition into the dynamic symbol table. Given a weak
1449 // definition, the only way that we can find the corresponding
1450 // strong definition, if any, is to search the symbol table.
1451 std::vector<Sized_symbol<size>*> object_symbols;
1453 const unsigned char* p = syms;
1454 const unsigned char* vs = versym;
1455 for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2)
1457 elfcpp::Sym<size, big_endian> sym(p);
1459 if (sympointers != NULL)
1460 (*sympointers)[i] = NULL;
1462 // Ignore symbols with local binding or that have
1463 // internal or hidden visibility.
1464 if (sym.get_st_bind() == elfcpp::STB_LOCAL
1465 || sym.get_st_visibility() == elfcpp::STV_INTERNAL
1466 || sym.get_st_visibility() == elfcpp::STV_HIDDEN)
1469 // A protected symbol in a shared library must be treated as a
1470 // normal symbol when viewed from outside the shared library.
1471 // Implement this by overriding the visibility here.
1472 // Likewise, an IFUNC symbol in a shared library must be treated
1473 // as a normal FUNC symbol.
1474 elfcpp::Sym<size, big_endian>* psym = &sym;
1475 unsigned char symbuf[sym_size];
1476 elfcpp::Sym<size, big_endian> sym2(symbuf);
1477 if (sym.get_st_visibility() == elfcpp::STV_PROTECTED
1478 || sym.get_st_type() == elfcpp::STT_GNU_IFUNC)
1480 memcpy(symbuf, p, sym_size);
1481 elfcpp::Sym_write<size, big_endian> sw(symbuf);
1482 if (sym.get_st_visibility() == elfcpp::STV_PROTECTED)
1483 sw.put_st_other(elfcpp::STV_DEFAULT, sym.get_st_nonvis());
1484 if (sym.get_st_type() == elfcpp::STT_GNU_IFUNC)
1485 sw.put_st_info(sym.get_st_bind(), elfcpp::STT_FUNC);
1489 unsigned int st_name = psym->get_st_name();
1490 if (st_name >= sym_name_size)
1492 dynobj->error(_("bad symbol name offset %u at %zu"),
1497 const char* name = sym_names + st_name;
1500 unsigned int st_shndx = dynobj->adjust_sym_shndx(i, psym->get_st_shndx(),
1503 if (st_shndx != elfcpp::SHN_UNDEF)
1506 Sized_symbol<size>* res;
1510 Stringpool::Key name_key;
1511 name = this->namepool_.add(name, true, &name_key);
1512 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
1513 false, *psym, st_shndx, is_ordinary,
1518 // Read the version information.
1520 unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs);
1522 bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0;
1523 v &= elfcpp::VERSYM_VERSION;
1525 // The Sun documentation says that V can be VER_NDX_LOCAL,
1526 // or VER_NDX_GLOBAL, or a version index. The meaning of
1527 // VER_NDX_LOCAL is defined as "Symbol has local scope."
1528 // The old GNU linker will happily generate VER_NDX_LOCAL
1529 // for an undefined symbol. I don't know what the Sun
1530 // linker will generate.
1532 if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL)
1533 && st_shndx != elfcpp::SHN_UNDEF)
1535 // This symbol should not be visible outside the object.
1539 // At this point we are definitely going to add this symbol.
1540 Stringpool::Key name_key;
1541 name = this->namepool_.add(name, true, &name_key);
1543 if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL)
1544 || v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL))
1546 // This symbol does not have a version.
1547 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
1548 false, *psym, st_shndx, is_ordinary,
1553 if (v >= version_map->size())
1555 dynobj->error(_("versym for symbol %zu out of range: %u"),
1560 const char* version = (*version_map)[v];
1561 if (version == NULL)
1563 dynobj->error(_("versym for symbol %zu has no name: %u"),
1568 Stringpool::Key version_key;
1569 version = this->namepool_.add(version, true, &version_key);
1571 // If this is an absolute symbol, and the version name
1572 // and symbol name are the same, then this is the
1573 // version definition symbol. These symbols exist to
1574 // support using -u to pull in particular versions. We
1575 // do not want to record a version for them.
1576 if (st_shndx == elfcpp::SHN_ABS
1578 && name_key == version_key)
1579 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
1580 false, *psym, st_shndx, is_ordinary,
1584 const bool is_default_version =
1585 !hidden && st_shndx != elfcpp::SHN_UNDEF;
1586 res = this->add_from_object(dynobj, name, name_key, version,
1587 version_key, is_default_version,
1589 is_ordinary, st_shndx);
1594 // Note that it is possible that RES was overridden by an
1595 // earlier object, in which case it can't be aliased here.
1596 if (st_shndx != elfcpp::SHN_UNDEF
1598 && psym->get_st_type() == elfcpp::STT_OBJECT
1599 && res->source() == Symbol::FROM_OBJECT
1600 && res->object() == dynobj)
1601 object_symbols.push_back(res);
1603 if (sympointers != NULL)
1604 (*sympointers)[i] = res;
1607 this->record_weak_aliases(&object_symbols);
1610 // Add a symbol from a incremental object file.
1612 template<int size, bool big_endian>
1614 Symbol_table::add_from_incrobj(
1618 elfcpp::Sym<size, big_endian>* sym)
1620 unsigned int st_shndx = sym->get_st_shndx();
1621 bool is_ordinary = st_shndx < elfcpp::SHN_LORESERVE;
1623 Stringpool::Key ver_key = 0;
1624 bool is_default_version = false;
1625 bool is_forced_local = false;
1627 Stringpool::Key name_key;
1628 name = this->namepool_.add(name, true, &name_key);
1630 Sized_symbol<size>* res;
1631 res = this->add_from_object(obj, name, name_key, ver, ver_key,
1632 is_default_version, *sym, st_shndx,
1633 is_ordinary, st_shndx);
1635 if (is_forced_local)
1636 this->force_local(res);
1641 // This is used to sort weak aliases. We sort them first by section
1642 // index, then by offset, then by weak ahead of strong.
1645 class Weak_alias_sorter
1648 bool operator()(const Sized_symbol<size>*, const Sized_symbol<size>*) const;
1653 Weak_alias_sorter<size>::operator()(const Sized_symbol<size>* s1,
1654 const Sized_symbol<size>* s2) const
1657 unsigned int s1_shndx = s1->shndx(&is_ordinary);
1658 gold_assert(is_ordinary);
1659 unsigned int s2_shndx = s2->shndx(&is_ordinary);
1660 gold_assert(is_ordinary);
1661 if (s1_shndx != s2_shndx)
1662 return s1_shndx < s2_shndx;
1664 if (s1->value() != s2->value())
1665 return s1->value() < s2->value();
1666 if (s1->binding() != s2->binding())
1668 if (s1->binding() == elfcpp::STB_WEAK)
1670 if (s2->binding() == elfcpp::STB_WEAK)
1673 return std::string(s1->name()) < std::string(s2->name());
1676 // SYMBOLS is a list of object symbols from a dynamic object. Look
1677 // for any weak aliases, and record them so that if we add the weak
1678 // alias to the dynamic symbol table, we also add the corresponding
1683 Symbol_table::record_weak_aliases(std::vector<Sized_symbol<size>*>* symbols)
1685 // Sort the vector by section index, then by offset, then by weak
1687 std::sort(symbols->begin(), symbols->end(), Weak_alias_sorter<size>());
1689 // Walk through the vector. For each weak definition, record
1691 for (typename std::vector<Sized_symbol<size>*>::const_iterator p =
1693 p != symbols->end();
1696 if ((*p)->binding() != elfcpp::STB_WEAK)
1699 // Build a circular list of weak aliases. Each symbol points to
1700 // the next one in the circular list.
1702 Sized_symbol<size>* from_sym = *p;
1703 typename std::vector<Sized_symbol<size>*>::const_iterator q;
1704 for (q = p + 1; q != symbols->end(); ++q)
1707 if ((*q)->shndx(&dummy) != from_sym->shndx(&dummy)
1708 || (*q)->value() != from_sym->value())
1711 this->weak_aliases_[from_sym] = *q;
1712 from_sym->set_has_alias();
1718 this->weak_aliases_[from_sym] = *p;
1719 from_sym->set_has_alias();
1726 // Create and return a specially defined symbol. If ONLY_IF_REF is
1727 // true, then only create the symbol if there is a reference to it.
1728 // If this does not return NULL, it sets *POLDSYM to the existing
1729 // symbol if there is one. This sets *RESOLVE_OLDSYM if we should
1730 // resolve the newly created symbol to the old one. This
1731 // canonicalizes *PNAME and *PVERSION.
1733 template<int size, bool big_endian>
1735 Symbol_table::define_special_symbol(const char** pname, const char** pversion,
1737 Sized_symbol<size>** poldsym,
1738 bool* resolve_oldsym)
1740 *resolve_oldsym = false;
1743 // If the caller didn't give us a version, see if we get one from
1744 // the version script.
1746 bool is_default_version = false;
1747 if (*pversion == NULL)
1750 if (this->version_script_.get_symbol_version(*pname, &v, &is_global))
1752 if (is_global && !v.empty())
1754 *pversion = v.c_str();
1755 // If we get the version from a version script, then we
1756 // are also the default version.
1757 is_default_version = true;
1763 Sized_symbol<size>* sym;
1765 bool add_to_table = false;
1766 typename Symbol_table_type::iterator add_loc = this->table_.end();
1767 bool add_def_to_table = false;
1768 typename Symbol_table_type::iterator add_def_loc = this->table_.end();
1772 oldsym = this->lookup(*pname, *pversion);
1773 if (oldsym == NULL && is_default_version)
1774 oldsym = this->lookup(*pname, NULL);
1775 if (oldsym == NULL || !oldsym->is_undefined())
1778 *pname = oldsym->name();
1779 if (is_default_version)
1780 *pversion = this->namepool_.add(*pversion, true, NULL);
1782 *pversion = oldsym->version();
1786 // Canonicalize NAME and VERSION.
1787 Stringpool::Key name_key;
1788 *pname = this->namepool_.add(*pname, true, &name_key);
1790 Stringpool::Key version_key = 0;
1791 if (*pversion != NULL)
1792 *pversion = this->namepool_.add(*pversion, true, &version_key);
1794 Symbol* const snull = NULL;
1795 std::pair<typename Symbol_table_type::iterator, bool> ins =
1796 this->table_.insert(std::make_pair(std::make_pair(name_key,
1800 std::pair<typename Symbol_table_type::iterator, bool> insdefault =
1801 std::make_pair(this->table_.end(), false);
1802 if (is_default_version)
1804 const Stringpool::Key vnull = 0;
1806 this->table_.insert(std::make_pair(std::make_pair(name_key,
1813 // We already have a symbol table entry for NAME/VERSION.
1814 oldsym = ins.first->second;
1815 gold_assert(oldsym != NULL);
1817 if (is_default_version)
1819 Sized_symbol<size>* soldsym =
1820 this->get_sized_symbol<size>(oldsym);
1821 this->define_default_version<size, big_endian>(soldsym,
1828 // We haven't seen this symbol before.
1829 gold_assert(ins.first->second == NULL);
1831 add_to_table = true;
1832 add_loc = ins.first;
1834 if (is_default_version && !insdefault.second)
1836 // We are adding NAME/VERSION, and it is the default
1837 // version. We already have an entry for NAME/NULL.
1838 oldsym = insdefault.first->second;
1839 *resolve_oldsym = true;
1845 if (is_default_version)
1847 add_def_to_table = true;
1848 add_def_loc = insdefault.first;
1854 const Target& target = parameters->target();
1855 if (!target.has_make_symbol())
1856 sym = new Sized_symbol<size>();
1859 Sized_target<size, big_endian>* sized_target =
1860 parameters->sized_target<size, big_endian>();
1861 sym = sized_target->make_symbol();
1867 add_loc->second = sym;
1869 gold_assert(oldsym != NULL);
1871 if (add_def_to_table)
1872 add_def_loc->second = sym;
1874 *poldsym = this->get_sized_symbol<size>(oldsym);
1879 // Define a symbol based on an Output_data.
1882 Symbol_table::define_in_output_data(const char* name,
1883 const char* version,
1889 elfcpp::STB binding,
1890 elfcpp::STV visibility,
1891 unsigned char nonvis,
1892 bool offset_is_from_end,
1895 if (parameters->target().get_size() == 32)
1897 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1898 return this->do_define_in_output_data<32>(name, version, defined, od,
1899 value, symsize, type, binding,
1907 else if (parameters->target().get_size() == 64)
1909 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1910 return this->do_define_in_output_data<64>(name, version, defined, od,
1911 value, symsize, type, binding,
1923 // Define a symbol in an Output_data, sized version.
1927 Symbol_table::do_define_in_output_data(
1929 const char* version,
1932 typename elfcpp::Elf_types<size>::Elf_Addr value,
1933 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
1935 elfcpp::STB binding,
1936 elfcpp::STV visibility,
1937 unsigned char nonvis,
1938 bool offset_is_from_end,
1941 Sized_symbol<size>* sym;
1942 Sized_symbol<size>* oldsym;
1943 bool resolve_oldsym;
1945 if (parameters->target().is_big_endian())
1947 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
1948 sym = this->define_special_symbol<size, true>(&name, &version,
1949 only_if_ref, &oldsym,
1957 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
1958 sym = this->define_special_symbol<size, false>(&name, &version,
1959 only_if_ref, &oldsym,
1969 sym->init_output_data(name, version, od, value, symsize, type, binding,
1970 visibility, nonvis, offset_is_from_end,
1971 defined == PREDEFINED);
1975 if (binding == elfcpp::STB_LOCAL
1976 || this->version_script_.symbol_is_local(name))
1977 this->force_local(sym);
1978 else if (version != NULL)
1979 sym->set_is_default();
1983 if (Symbol_table::should_override_with_special(oldsym, type, defined))
1984 this->override_with_special(oldsym, sym);
1990 if (defined == PREDEFINED
1991 && (binding == elfcpp::STB_LOCAL
1992 || this->version_script_.symbol_is_local(name)))
1993 this->force_local(oldsym);
1999 // Define a symbol based on an Output_segment.
2002 Symbol_table::define_in_output_segment(const char* name,
2003 const char* version,
2009 elfcpp::STB binding,
2010 elfcpp::STV visibility,
2011 unsigned char nonvis,
2012 Symbol::Segment_offset_base offset_base,
2015 if (parameters->target().get_size() == 32)
2017 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2018 return this->do_define_in_output_segment<32>(name, version, defined, os,
2019 value, symsize, type,
2020 binding, visibility, nonvis,
2021 offset_base, only_if_ref);
2026 else if (parameters->target().get_size() == 64)
2028 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2029 return this->do_define_in_output_segment<64>(name, version, defined, os,
2030 value, symsize, type,
2031 binding, visibility, nonvis,
2032 offset_base, only_if_ref);
2041 // Define a symbol in an Output_segment, sized version.
2045 Symbol_table::do_define_in_output_segment(
2047 const char* version,
2050 typename elfcpp::Elf_types<size>::Elf_Addr value,
2051 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
2053 elfcpp::STB binding,
2054 elfcpp::STV visibility,
2055 unsigned char nonvis,
2056 Symbol::Segment_offset_base offset_base,
2059 Sized_symbol<size>* sym;
2060 Sized_symbol<size>* oldsym;
2061 bool resolve_oldsym;
2063 if (parameters->target().is_big_endian())
2065 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2066 sym = this->define_special_symbol<size, true>(&name, &version,
2067 only_if_ref, &oldsym,
2075 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2076 sym = this->define_special_symbol<size, false>(&name, &version,
2077 only_if_ref, &oldsym,
2087 sym->init_output_segment(name, version, os, value, symsize, type, binding,
2088 visibility, nonvis, offset_base,
2089 defined == PREDEFINED);
2093 if (binding == elfcpp::STB_LOCAL
2094 || this->version_script_.symbol_is_local(name))
2095 this->force_local(sym);
2096 else if (version != NULL)
2097 sym->set_is_default();
2101 if (Symbol_table::should_override_with_special(oldsym, type, defined))
2102 this->override_with_special(oldsym, sym);
2108 if (binding == elfcpp::STB_LOCAL
2109 || this->version_script_.symbol_is_local(name))
2110 this->force_local(oldsym);
2116 // Define a special symbol with a constant value. It is a multiple
2117 // definition error if this symbol is already defined.
2120 Symbol_table::define_as_constant(const char* name,
2121 const char* version,
2126 elfcpp::STB binding,
2127 elfcpp::STV visibility,
2128 unsigned char nonvis,
2130 bool force_override)
2132 if (parameters->target().get_size() == 32)
2134 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2135 return this->do_define_as_constant<32>(name, version, defined, value,
2136 symsize, type, binding,
2137 visibility, nonvis, only_if_ref,
2143 else if (parameters->target().get_size() == 64)
2145 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2146 return this->do_define_as_constant<64>(name, version, defined, value,
2147 symsize, type, binding,
2148 visibility, nonvis, only_if_ref,
2158 // Define a symbol as a constant, sized version.
2162 Symbol_table::do_define_as_constant(
2164 const char* version,
2166 typename elfcpp::Elf_types<size>::Elf_Addr value,
2167 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
2169 elfcpp::STB binding,
2170 elfcpp::STV visibility,
2171 unsigned char nonvis,
2173 bool force_override)
2175 Sized_symbol<size>* sym;
2176 Sized_symbol<size>* oldsym;
2177 bool resolve_oldsym;
2179 if (parameters->target().is_big_endian())
2181 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2182 sym = this->define_special_symbol<size, true>(&name, &version,
2183 only_if_ref, &oldsym,
2191 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2192 sym = this->define_special_symbol<size, false>(&name, &version,
2193 only_if_ref, &oldsym,
2203 sym->init_constant(name, version, value, symsize, type, binding, visibility,
2204 nonvis, defined == PREDEFINED);
2208 // Version symbols are absolute symbols with name == version.
2209 // We don't want to force them to be local.
2210 if ((version == NULL
2213 && (binding == elfcpp::STB_LOCAL
2214 || this->version_script_.symbol_is_local(name)))
2215 this->force_local(sym);
2216 else if (version != NULL
2217 && (name != version || value != 0))
2218 sym->set_is_default();
2223 || Symbol_table::should_override_with_special(oldsym, type, defined))
2224 this->override_with_special(oldsym, sym);
2230 if (binding == elfcpp::STB_LOCAL
2231 || this->version_script_.symbol_is_local(name))
2232 this->force_local(oldsym);
2238 // Define a set of symbols in output sections.
2241 Symbol_table::define_symbols(const Layout* layout, int count,
2242 const Define_symbol_in_section* p,
2245 for (int i = 0; i < count; ++i, ++p)
2247 Output_section* os = layout->find_output_section(p->output_section);
2249 this->define_in_output_data(p->name, NULL, PREDEFINED, os, p->value,
2250 p->size, p->type, p->binding,
2251 p->visibility, p->nonvis,
2252 p->offset_is_from_end,
2253 only_if_ref || p->only_if_ref);
2255 this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size,
2256 p->type, p->binding, p->visibility, p->nonvis,
2257 only_if_ref || p->only_if_ref,
2262 // Define a set of symbols in output segments.
2265 Symbol_table::define_symbols(const Layout* layout, int count,
2266 const Define_symbol_in_segment* p,
2269 for (int i = 0; i < count; ++i, ++p)
2271 Output_segment* os = layout->find_output_segment(p->segment_type,
2272 p->segment_flags_set,
2273 p->segment_flags_clear);
2275 this->define_in_output_segment(p->name, NULL, PREDEFINED, os, p->value,
2276 p->size, p->type, p->binding,
2277 p->visibility, p->nonvis,
2279 only_if_ref || p->only_if_ref);
2281 this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size,
2282 p->type, p->binding, p->visibility, p->nonvis,
2283 only_if_ref || p->only_if_ref,
2288 // Define CSYM using a COPY reloc. POSD is the Output_data where the
2289 // symbol should be defined--typically a .dyn.bss section. VALUE is
2290 // the offset within POSD.
2294 Symbol_table::define_with_copy_reloc(
2295 Sized_symbol<size>* csym,
2297 typename elfcpp::Elf_types<size>::Elf_Addr value)
2299 gold_assert(csym->is_from_dynobj());
2300 gold_assert(!csym->is_copied_from_dynobj());
2301 Object* object = csym->object();
2302 gold_assert(object->is_dynamic());
2303 Dynobj* dynobj = static_cast<Dynobj*>(object);
2305 // Our copied variable has to override any variable in a shared
2307 elfcpp::STB binding = csym->binding();
2308 if (binding == elfcpp::STB_WEAK)
2309 binding = elfcpp::STB_GLOBAL;
2311 this->define_in_output_data(csym->name(), csym->version(), COPY,
2312 posd, value, csym->symsize(),
2313 csym->type(), binding,
2314 csym->visibility(), csym->nonvis(),
2317 csym->set_is_copied_from_dynobj();
2318 csym->set_needs_dynsym_entry();
2320 this->copied_symbol_dynobjs_[csym] = dynobj;
2322 // We have now defined all aliases, but we have not entered them all
2323 // in the copied_symbol_dynobjs_ map.
2324 if (csym->has_alias())
2329 sym = this->weak_aliases_[sym];
2332 gold_assert(sym->output_data() == posd);
2334 sym->set_is_copied_from_dynobj();
2335 this->copied_symbol_dynobjs_[sym] = dynobj;
2340 // SYM is defined using a COPY reloc. Return the dynamic object where
2341 // the original definition was found.
2344 Symbol_table::get_copy_source(const Symbol* sym) const
2346 gold_assert(sym->is_copied_from_dynobj());
2347 Copied_symbol_dynobjs::const_iterator p =
2348 this->copied_symbol_dynobjs_.find(sym);
2349 gold_assert(p != this->copied_symbol_dynobjs_.end());
2353 // Add any undefined symbols named on the command line.
2356 Symbol_table::add_undefined_symbols_from_command_line(Layout* layout)
2358 if (parameters->options().any_undefined()
2359 || layout->script_options()->any_unreferenced())
2361 if (parameters->target().get_size() == 32)
2363 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2364 this->do_add_undefined_symbols_from_command_line<32>(layout);
2369 else if (parameters->target().get_size() == 64)
2371 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2372 this->do_add_undefined_symbols_from_command_line<64>(layout);
2384 Symbol_table::do_add_undefined_symbols_from_command_line(Layout* layout)
2386 for (options::String_set::const_iterator p =
2387 parameters->options().undefined_begin();
2388 p != parameters->options().undefined_end();
2390 this->add_undefined_symbol_from_command_line<size>(p->c_str());
2392 for (options::String_set::const_iterator p =
2393 parameters->options().export_dynamic_symbol_begin();
2394 p != parameters->options().export_dynamic_symbol_end();
2396 this->add_undefined_symbol_from_command_line<size>(p->c_str());
2398 for (Script_options::referenced_const_iterator p =
2399 layout->script_options()->referenced_begin();
2400 p != layout->script_options()->referenced_end();
2402 this->add_undefined_symbol_from_command_line<size>(p->c_str());
2407 Symbol_table::add_undefined_symbol_from_command_line(const char* name)
2409 if (this->lookup(name) != NULL)
2412 const char* version = NULL;
2414 Sized_symbol<size>* sym;
2415 Sized_symbol<size>* oldsym;
2416 bool resolve_oldsym;
2417 if (parameters->target().is_big_endian())
2419 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2420 sym = this->define_special_symbol<size, true>(&name, &version,
2429 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2430 sym = this->define_special_symbol<size, false>(&name, &version,
2438 gold_assert(oldsym == NULL);
2440 sym->init_undefined(name, version, elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
2441 elfcpp::STV_DEFAULT, 0);
2442 ++this->saw_undefined_;
2445 // Set the dynamic symbol indexes. INDEX is the index of the first
2446 // global dynamic symbol. Pointers to the symbols are stored into the
2447 // vector SYMS. The names are added to DYNPOOL. This returns an
2448 // updated dynamic symbol index.
2451 Symbol_table::set_dynsym_indexes(unsigned int index,
2452 std::vector<Symbol*>* syms,
2453 Stringpool* dynpool,
2456 std::vector<Symbol*> as_needed_sym;
2458 // Allow a target to set dynsym indexes.
2459 if (parameters->target().has_custom_set_dynsym_indexes())
2461 std::vector<Symbol*> dyn_symbols;
2462 for (Symbol_table_type::iterator p = this->table_.begin();
2463 p != this->table_.end();
2466 Symbol* sym = p->second;
2467 if (!sym->should_add_dynsym_entry(this))
2468 sym->set_dynsym_index(-1U);
2470 dyn_symbols.push_back(sym);
2473 return parameters->target().set_dynsym_indexes(&dyn_symbols, index, syms,
2474 dynpool, versions, this);
2477 for (Symbol_table_type::iterator p = this->table_.begin();
2478 p != this->table_.end();
2481 Symbol* sym = p->second;
2483 // Note that SYM may already have a dynamic symbol index, since
2484 // some symbols appear more than once in the symbol table, with
2485 // and without a version.
2487 if (!sym->should_add_dynsym_entry(this))
2488 sym->set_dynsym_index(-1U);
2489 else if (!sym->has_dynsym_index())
2491 sym->set_dynsym_index(index);
2493 syms->push_back(sym);
2494 dynpool->add(sym->name(), false, NULL);
2496 // If the symbol is defined in a dynamic object and is
2497 // referenced strongly in a regular object, then mark the
2498 // dynamic object as needed. This is used to implement
2500 if (sym->is_from_dynobj()
2502 && !sym->is_undef_binding_weak())
2503 sym->object()->set_is_needed();
2505 // Record any version information, except those from
2506 // as-needed libraries not seen to be needed. Note that the
2507 // is_needed state for such libraries can change in this loop.
2508 if (sym->version() != NULL)
2510 if (!sym->is_from_dynobj()
2511 || !sym->object()->as_needed()
2512 || sym->object()->is_needed())
2513 versions->record_version(this, dynpool, sym);
2515 as_needed_sym.push_back(sym);
2520 // Process version information for symbols from as-needed libraries.
2521 for (std::vector<Symbol*>::iterator p = as_needed_sym.begin();
2522 p != as_needed_sym.end();
2527 if (sym->object()->is_needed())
2528 versions->record_version(this, dynpool, sym);
2530 sym->clear_version();
2533 // Finish up the versions. In some cases this may add new dynamic
2535 index = versions->finalize(this, index, syms);
2540 // Set the final values for all the symbols. The index of the first
2541 // global symbol in the output file is *PLOCAL_SYMCOUNT. Record the
2542 // file offset OFF. Add their names to POOL. Return the new file
2543 // offset. Update *PLOCAL_SYMCOUNT if necessary.
2546 Symbol_table::finalize(off_t off, off_t dynoff, size_t dyn_global_index,
2547 size_t dyncount, Stringpool* pool,
2548 unsigned int* plocal_symcount)
2552 gold_assert(*plocal_symcount != 0);
2553 this->first_global_index_ = *plocal_symcount;
2555 this->dynamic_offset_ = dynoff;
2556 this->first_dynamic_global_index_ = dyn_global_index;
2557 this->dynamic_count_ = dyncount;
2559 if (parameters->target().get_size() == 32)
2561 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE)
2562 ret = this->sized_finalize<32>(off, pool, plocal_symcount);
2567 else if (parameters->target().get_size() == 64)
2569 #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE)
2570 ret = this->sized_finalize<64>(off, pool, plocal_symcount);
2578 // Now that we have the final symbol table, we can reliably note
2579 // which symbols should get warnings.
2580 this->warnings_.note_warnings(this);
2585 // SYM is going into the symbol table at *PINDEX. Add the name to
2586 // POOL, update *PINDEX and *POFF.
2590 Symbol_table::add_to_final_symtab(Symbol* sym, Stringpool* pool,
2591 unsigned int* pindex, off_t* poff)
2593 sym->set_symtab_index(*pindex);
2594 if (sym->version() == NULL || !parameters->options().relocatable())
2595 pool->add(sym->name(), false, NULL);
2597 pool->add(sym->versioned_name(), true, NULL);
2599 *poff += elfcpp::Elf_sizes<size>::sym_size;
2602 // Set the final value for all the symbols. This is called after
2603 // Layout::finalize, so all the output sections have their final
2608 Symbol_table::sized_finalize(off_t off, Stringpool* pool,
2609 unsigned int* plocal_symcount)
2611 off = align_address(off, size >> 3);
2612 this->offset_ = off;
2614 unsigned int index = *plocal_symcount;
2615 const unsigned int orig_index = index;
2617 // First do all the symbols which have been forced to be local, as
2618 // they must appear before all global symbols.
2619 for (Forced_locals::iterator p = this->forced_locals_.begin();
2620 p != this->forced_locals_.end();
2624 gold_assert(sym->is_forced_local());
2625 if (this->sized_finalize_symbol<size>(sym))
2627 this->add_to_final_symtab<size>(sym, pool, &index, &off);
2632 // Now do all the remaining symbols.
2633 for (Symbol_table_type::iterator p = this->table_.begin();
2634 p != this->table_.end();
2637 Symbol* sym = p->second;
2638 if (this->sized_finalize_symbol<size>(sym))
2639 this->add_to_final_symtab<size>(sym, pool, &index, &off);
2642 this->output_count_ = index - orig_index;
2647 // Compute the final value of SYM and store status in location PSTATUS.
2648 // During relaxation, this may be called multiple times for a symbol to
2649 // compute its would-be final value in each relaxation pass.
2652 typename Sized_symbol<size>::Value_type
2653 Symbol_table::compute_final_value(
2654 const Sized_symbol<size>* sym,
2655 Compute_final_value_status* pstatus) const
2657 typedef typename Sized_symbol<size>::Value_type Value_type;
2660 switch (sym->source())
2662 case Symbol::FROM_OBJECT:
2665 unsigned int shndx = sym->shndx(&is_ordinary);
2668 && shndx != elfcpp::SHN_ABS
2669 && !Symbol::is_common_shndx(shndx))
2671 *pstatus = CFVS_UNSUPPORTED_SYMBOL_SECTION;
2675 Object* symobj = sym->object();
2676 if (symobj->is_dynamic())
2679 shndx = elfcpp::SHN_UNDEF;
2681 else if (symobj->pluginobj() != NULL)
2684 shndx = elfcpp::SHN_UNDEF;
2686 else if (shndx == elfcpp::SHN_UNDEF)
2688 else if (!is_ordinary
2689 && (shndx == elfcpp::SHN_ABS
2690 || Symbol::is_common_shndx(shndx)))
2691 value = sym->value();
2694 Relobj* relobj = static_cast<Relobj*>(symobj);
2695 Output_section* os = relobj->output_section(shndx);
2697 if (this->is_section_folded(relobj, shndx))
2699 gold_assert(os == NULL);
2700 // Get the os of the section it is folded onto.
2701 Section_id folded = this->icf_->get_folded_section(relobj,
2703 gold_assert(folded.first != NULL);
2704 Relobj* folded_obj = reinterpret_cast<Relobj*>(folded.first);
2705 unsigned folded_shndx = folded.second;
2707 os = folded_obj->output_section(folded_shndx);
2708 gold_assert(os != NULL);
2710 // Replace (relobj, shndx) with canonical ICF input section.
2711 shndx = folded_shndx;
2712 relobj = folded_obj;
2715 uint64_t secoff64 = relobj->output_section_offset(shndx);
2718 bool static_or_reloc = (parameters->doing_static_link() ||
2719 parameters->options().relocatable());
2720 gold_assert(static_or_reloc || sym->dynsym_index() == -1U);
2722 *pstatus = CFVS_NO_OUTPUT_SECTION;
2726 if (secoff64 == -1ULL)
2728 // The section needs special handling (e.g., a merge section).
2730 value = os->output_address(relobj, shndx, sym->value());
2735 convert_types<Value_type, uint64_t>(secoff64);
2736 if (sym->type() == elfcpp::STT_TLS)
2737 value = sym->value() + os->tls_offset() + secoff;
2739 value = sym->value() + os->address() + secoff;
2745 case Symbol::IN_OUTPUT_DATA:
2747 Output_data* od = sym->output_data();
2748 value = sym->value();
2749 if (sym->type() != elfcpp::STT_TLS)
2750 value += od->address();
2753 Output_section* os = od->output_section();
2754 gold_assert(os != NULL);
2755 value += os->tls_offset() + (od->address() - os->address());
2757 if (sym->offset_is_from_end())
2758 value += od->data_size();
2762 case Symbol::IN_OUTPUT_SEGMENT:
2764 Output_segment* os = sym->output_segment();
2765 value = sym->value();
2766 if (sym->type() != elfcpp::STT_TLS)
2767 value += os->vaddr();
2768 switch (sym->offset_base())
2770 case Symbol::SEGMENT_START:
2772 case Symbol::SEGMENT_END:
2773 value += os->memsz();
2775 case Symbol::SEGMENT_BSS:
2776 value += os->filesz();
2784 case Symbol::IS_CONSTANT:
2785 value = sym->value();
2788 case Symbol::IS_UNDEFINED:
2800 // Finalize the symbol SYM. This returns true if the symbol should be
2801 // added to the symbol table, false otherwise.
2805 Symbol_table::sized_finalize_symbol(Symbol* unsized_sym)
2807 typedef typename Sized_symbol<size>::Value_type Value_type;
2809 Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym);
2811 // The default version of a symbol may appear twice in the symbol
2812 // table. We only need to finalize it once.
2813 if (sym->has_symtab_index())
2818 gold_assert(!sym->has_symtab_index());
2819 sym->set_symtab_index(-1U);
2820 gold_assert(sym->dynsym_index() == -1U);
2824 // If the symbol is only present on plugin files, the plugin decided we
2826 if (!sym->in_real_elf())
2828 gold_assert(!sym->has_symtab_index());
2829 sym->set_symtab_index(-1U);
2833 // Compute final symbol value.
2834 Compute_final_value_status status;
2835 Value_type value = this->compute_final_value(sym, &status);
2841 case CFVS_UNSUPPORTED_SYMBOL_SECTION:
2844 unsigned int shndx = sym->shndx(&is_ordinary);
2845 gold_error(_("%s: unsupported symbol section 0x%x"),
2846 sym->demangled_name().c_str(), shndx);
2849 case CFVS_NO_OUTPUT_SECTION:
2850 sym->set_symtab_index(-1U);
2856 sym->set_value(value);
2858 if (parameters->options().strip_all()
2859 || !parameters->options().should_retain_symbol(sym->name()))
2861 sym->set_symtab_index(-1U);
2868 // Write out the global symbols.
2871 Symbol_table::write_globals(const Stringpool* sympool,
2872 const Stringpool* dynpool,
2873 Output_symtab_xindex* symtab_xindex,
2874 Output_symtab_xindex* dynsym_xindex,
2875 Output_file* of) const
2877 switch (parameters->size_and_endianness())
2879 #ifdef HAVE_TARGET_32_LITTLE
2880 case Parameters::TARGET_32_LITTLE:
2881 this->sized_write_globals<32, false>(sympool, dynpool, symtab_xindex,
2885 #ifdef HAVE_TARGET_32_BIG
2886 case Parameters::TARGET_32_BIG:
2887 this->sized_write_globals<32, true>(sympool, dynpool, symtab_xindex,
2891 #ifdef HAVE_TARGET_64_LITTLE
2892 case Parameters::TARGET_64_LITTLE:
2893 this->sized_write_globals<64, false>(sympool, dynpool, symtab_xindex,
2897 #ifdef HAVE_TARGET_64_BIG
2898 case Parameters::TARGET_64_BIG:
2899 this->sized_write_globals<64, true>(sympool, dynpool, symtab_xindex,
2908 // Write out the global symbols.
2910 template<int size, bool big_endian>
2912 Symbol_table::sized_write_globals(const Stringpool* sympool,
2913 const Stringpool* dynpool,
2914 Output_symtab_xindex* symtab_xindex,
2915 Output_symtab_xindex* dynsym_xindex,
2916 Output_file* of) const
2918 const Target& target = parameters->target();
2920 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
2922 const unsigned int output_count = this->output_count_;
2923 const section_size_type oview_size = output_count * sym_size;
2924 const unsigned int first_global_index = this->first_global_index_;
2925 unsigned char* psyms;
2926 if (this->offset_ == 0 || output_count == 0)
2929 psyms = of->get_output_view(this->offset_, oview_size);
2931 const unsigned int dynamic_count = this->dynamic_count_;
2932 const section_size_type dynamic_size = dynamic_count * sym_size;
2933 const unsigned int first_dynamic_global_index =
2934 this->first_dynamic_global_index_;
2935 unsigned char* dynamic_view;
2936 if (this->dynamic_offset_ == 0 || dynamic_count == 0)
2937 dynamic_view = NULL;
2939 dynamic_view = of->get_output_view(this->dynamic_offset_, dynamic_size);
2941 for (Symbol_table_type::const_iterator p = this->table_.begin();
2942 p != this->table_.end();
2945 Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second);
2947 // Possibly warn about unresolved symbols in shared libraries.
2948 this->warn_about_undefined_dynobj_symbol(sym);
2950 unsigned int sym_index = sym->symtab_index();
2951 unsigned int dynsym_index;
2952 if (dynamic_view == NULL)
2955 dynsym_index = sym->dynsym_index();
2957 if (sym_index == -1U && dynsym_index == -1U)
2959 // This symbol is not included in the output file.
2964 typename elfcpp::Elf_types<size>::Elf_Addr sym_value = sym->value();
2965 typename elfcpp::Elf_types<size>::Elf_Addr dynsym_value = sym_value;
2966 elfcpp::STB binding = sym->binding();
2968 // If --weak-unresolved-symbols is set, change binding of unresolved
2969 // global symbols to STB_WEAK.
2970 if (parameters->options().weak_unresolved_symbols()
2971 && binding == elfcpp::STB_GLOBAL
2972 && sym->is_undefined())
2973 binding = elfcpp::STB_WEAK;
2975 // If --no-gnu-unique is set, change STB_GNU_UNIQUE to STB_GLOBAL.
2976 if (binding == elfcpp::STB_GNU_UNIQUE
2977 && !parameters->options().gnu_unique())
2978 binding = elfcpp::STB_GLOBAL;
2980 switch (sym->source())
2982 case Symbol::FROM_OBJECT:
2985 unsigned int in_shndx = sym->shndx(&is_ordinary);
2988 && in_shndx != elfcpp::SHN_ABS
2989 && !Symbol::is_common_shndx(in_shndx))
2991 gold_error(_("%s: unsupported symbol section 0x%x"),
2992 sym->demangled_name().c_str(), in_shndx);
2997 Object* symobj = sym->object();
2998 if (symobj->is_dynamic())
3000 if (sym->needs_dynsym_value())
3001 dynsym_value = target.dynsym_value(sym);
3002 shndx = elfcpp::SHN_UNDEF;
3003 if (sym->is_undef_binding_weak())
3004 binding = elfcpp::STB_WEAK;
3006 binding = elfcpp::STB_GLOBAL;
3008 else if (symobj->pluginobj() != NULL)
3009 shndx = elfcpp::SHN_UNDEF;
3010 else if (in_shndx == elfcpp::SHN_UNDEF
3012 && (in_shndx == elfcpp::SHN_ABS
3013 || Symbol::is_common_shndx(in_shndx))))
3017 Relobj* relobj = static_cast<Relobj*>(symobj);
3018 Output_section* os = relobj->output_section(in_shndx);
3019 if (this->is_section_folded(relobj, in_shndx))
3021 // This global symbol must be written out even though
3023 // Get the os of the section it is folded onto.
3025 this->icf_->get_folded_section(relobj, in_shndx);
3026 gold_assert(folded.first !=NULL);
3027 Relobj* folded_obj =
3028 reinterpret_cast<Relobj*>(folded.first);
3029 os = folded_obj->output_section(folded.second);
3030 gold_assert(os != NULL);
3032 gold_assert(os != NULL);
3033 shndx = os->out_shndx();
3035 if (shndx >= elfcpp::SHN_LORESERVE)
3037 if (sym_index != -1U)
3038 symtab_xindex->add(sym_index, shndx);
3039 if (dynsym_index != -1U)
3040 dynsym_xindex->add(dynsym_index, shndx);
3041 shndx = elfcpp::SHN_XINDEX;
3044 // In object files symbol values are section
3046 if (parameters->options().relocatable())
3047 sym_value -= os->address();
3053 case Symbol::IN_OUTPUT_DATA:
3055 Output_data* od = sym->output_data();
3057 shndx = od->out_shndx();
3058 if (shndx >= elfcpp::SHN_LORESERVE)
3060 if (sym_index != -1U)
3061 symtab_xindex->add(sym_index, shndx);
3062 if (dynsym_index != -1U)
3063 dynsym_xindex->add(dynsym_index, shndx);
3064 shndx = elfcpp::SHN_XINDEX;
3067 // In object files symbol values are section
3069 if (parameters->options().relocatable())
3070 sym_value -= od->address();
3074 case Symbol::IN_OUTPUT_SEGMENT:
3075 shndx = elfcpp::SHN_ABS;
3078 case Symbol::IS_CONSTANT:
3079 shndx = elfcpp::SHN_ABS;
3082 case Symbol::IS_UNDEFINED:
3083 shndx = elfcpp::SHN_UNDEF;
3090 if (sym_index != -1U)
3092 sym_index -= first_global_index;
3093 gold_assert(sym_index < output_count);
3094 unsigned char* ps = psyms + (sym_index * sym_size);
3095 this->sized_write_symbol<size, big_endian>(sym, sym_value, shndx,
3096 binding, sympool, ps);
3099 if (dynsym_index != -1U)
3101 dynsym_index -= first_dynamic_global_index;
3102 gold_assert(dynsym_index < dynamic_count);
3103 unsigned char* pd = dynamic_view + (dynsym_index * sym_size);
3104 this->sized_write_symbol<size, big_endian>(sym, dynsym_value, shndx,
3105 binding, dynpool, pd);
3106 // Allow a target to adjust dynamic symbol value.
3107 parameters->target().adjust_dyn_symbol(sym, pd);
3111 of->write_output_view(this->offset_, oview_size, psyms);
3112 if (dynamic_view != NULL)
3113 of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view);
3116 // Write out the symbol SYM, in section SHNDX, to P. POOL is the
3117 // strtab holding the name.
3119 template<int size, bool big_endian>
3121 Symbol_table::sized_write_symbol(
3122 Sized_symbol<size>* sym,
3123 typename elfcpp::Elf_types<size>::Elf_Addr value,
3125 elfcpp::STB binding,
3126 const Stringpool* pool,
3127 unsigned char* p) const
3129 elfcpp::Sym_write<size, big_endian> osym(p);
3130 if (sym->version() == NULL || !parameters->options().relocatable())
3131 osym.put_st_name(pool->get_offset(sym->name()));
3133 osym.put_st_name(pool->get_offset(sym->versioned_name()));
3134 osym.put_st_value(value);
3135 // Use a symbol size of zero for undefined symbols from shared libraries.
3136 if (shndx == elfcpp::SHN_UNDEF && sym->is_from_dynobj())
3137 osym.put_st_size(0);
3139 osym.put_st_size(sym->symsize());
3140 elfcpp::STT type = sym->type();
3141 gold_assert(type != elfcpp::STT_GNU_IFUNC || !sym->is_from_dynobj());
3142 // A version script may have overridden the default binding.
3143 if (sym->is_forced_local())
3144 osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, type));
3146 osym.put_st_info(elfcpp::elf_st_info(binding, type));
3147 osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis()));
3148 osym.put_st_shndx(shndx);
3151 // Check for unresolved symbols in shared libraries. This is
3152 // controlled by the --allow-shlib-undefined option.
3154 // We only warn about libraries for which we have seen all the
3155 // DT_NEEDED entries. We don't try to track down DT_NEEDED entries
3156 // which were not seen in this link. If we didn't see a DT_NEEDED
3157 // entry, we aren't going to be able to reliably report whether the
3158 // symbol is undefined.
3160 // We also don't warn about libraries found in a system library
3161 // directory (e.g., /lib or /usr/lib); we assume that those libraries
3162 // are OK. This heuristic avoids problems on GNU/Linux, in which -ldl
3163 // can have undefined references satisfied by ld-linux.so.
3166 Symbol_table::warn_about_undefined_dynobj_symbol(Symbol* sym) const
3169 if (sym->source() == Symbol::FROM_OBJECT
3170 && sym->object()->is_dynamic()
3171 && sym->shndx(&dummy) == elfcpp::SHN_UNDEF
3172 && sym->binding() != elfcpp::STB_WEAK
3173 && !parameters->options().allow_shlib_undefined()
3174 && !parameters->target().is_defined_by_abi(sym)
3175 && !sym->object()->is_in_system_directory())
3177 // A very ugly cast.
3178 Dynobj* dynobj = static_cast<Dynobj*>(sym->object());
3179 if (!dynobj->has_unknown_needed_entries())
3180 gold_undefined_symbol(sym);
3184 // Write out a section symbol. Return the update offset.
3187 Symbol_table::write_section_symbol(const Output_section* os,
3188 Output_symtab_xindex* symtab_xindex,
3192 switch (parameters->size_and_endianness())
3194 #ifdef HAVE_TARGET_32_LITTLE
3195 case Parameters::TARGET_32_LITTLE:
3196 this->sized_write_section_symbol<32, false>(os, symtab_xindex, of,
3200 #ifdef HAVE_TARGET_32_BIG
3201 case Parameters::TARGET_32_BIG:
3202 this->sized_write_section_symbol<32, true>(os, symtab_xindex, of,
3206 #ifdef HAVE_TARGET_64_LITTLE
3207 case Parameters::TARGET_64_LITTLE:
3208 this->sized_write_section_symbol<64, false>(os, symtab_xindex, of,
3212 #ifdef HAVE_TARGET_64_BIG
3213 case Parameters::TARGET_64_BIG:
3214 this->sized_write_section_symbol<64, true>(os, symtab_xindex, of,
3223 // Write out a section symbol, specialized for size and endianness.
3225 template<int size, bool big_endian>
3227 Symbol_table::sized_write_section_symbol(const Output_section* os,
3228 Output_symtab_xindex* symtab_xindex,
3232 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
3234 unsigned char* pov = of->get_output_view(offset, sym_size);
3236 elfcpp::Sym_write<size, big_endian> osym(pov);
3237 osym.put_st_name(0);
3238 if (parameters->options().relocatable())
3239 osym.put_st_value(0);
3241 osym.put_st_value(os->address());
3242 osym.put_st_size(0);
3243 osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL,
3244 elfcpp::STT_SECTION));
3245 osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0));
3247 unsigned int shndx = os->out_shndx();
3248 if (shndx >= elfcpp::SHN_LORESERVE)
3250 symtab_xindex->add(os->symtab_index(), shndx);
3251 shndx = elfcpp::SHN_XINDEX;
3253 osym.put_st_shndx(shndx);
3255 of->write_output_view(offset, sym_size, pov);
3258 // Print statistical information to stderr. This is used for --stats.
3261 Symbol_table::print_stats() const
3263 #if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP)
3264 fprintf(stderr, _("%s: symbol table entries: %zu; buckets: %zu\n"),
3265 program_name, this->table_.size(), this->table_.bucket_count());
3267 fprintf(stderr, _("%s: symbol table entries: %zu\n"),
3268 program_name, this->table_.size());
3270 this->namepool_.print_stats("symbol table stringpool");
3273 // We check for ODR violations by looking for symbols with the same
3274 // name for which the debugging information reports that they were
3275 // defined in disjoint source locations. When comparing the source
3276 // location, we consider instances with the same base filename to be
3277 // the same. This is because different object files/shared libraries
3278 // can include the same header file using different paths, and
3279 // different optimization settings can make the line number appear to
3280 // be a couple lines off, and we don't want to report an ODR violation
3283 // This struct is used to compare line information, as returned by
3284 // Dwarf_line_info::one_addr2line. It implements a < comparison
3285 // operator used with std::sort.
3287 struct Odr_violation_compare
3290 operator()(const std::string& s1, const std::string& s2) const
3292 // Inputs should be of the form "dirname/filename:linenum" where
3293 // "dirname/" is optional. We want to compare just the filename:linenum.
3295 // Find the last '/' in each string.
3296 std::string::size_type s1begin = s1.rfind('/');
3297 std::string::size_type s2begin = s2.rfind('/');
3298 // If there was no '/' in a string, start at the beginning.
3299 if (s1begin == std::string::npos)
3301 if (s2begin == std::string::npos)
3303 return s1.compare(s1begin, std::string::npos,
3304 s2, s2begin, std::string::npos) < 0;
3308 // Returns all of the lines attached to LOC, not just the one the
3309 // instruction actually came from.
3310 std::vector<std::string>
3311 Symbol_table::linenos_from_loc(const Task* task,
3312 const Symbol_location& loc)
3314 // We need to lock the object in order to read it. This
3315 // means that we have to run in a singleton Task. If we
3316 // want to run this in a general Task for better
3317 // performance, we will need one Task for object, plus
3318 // appropriate locking to ensure that we don't conflict with
3319 // other uses of the object. Also note, one_addr2line is not
3320 // currently thread-safe.
3321 Task_lock_obj<Object> tl(task, loc.object);
3323 std::vector<std::string> result;
3324 Symbol_location code_loc = loc;
3325 parameters->target().function_location(&code_loc);
3326 // 16 is the size of the object-cache that one_addr2line should use.
3327 std::string canonical_result = Dwarf_line_info::one_addr2line(
3328 code_loc.object, code_loc.shndx, code_loc.offset, 16, &result);
3329 if (!canonical_result.empty())
3330 result.push_back(canonical_result);
3334 // OutputIterator that records if it was ever assigned to. This
3335 // allows it to be used with std::set_intersection() to check for
3336 // intersection rather than computing the intersection.
3337 struct Check_intersection
3339 Check_intersection()
3343 bool had_intersection() const
3344 { return this->value_; }
3346 Check_intersection& operator++()
3349 Check_intersection& operator*()
3352 template<typename T>
3353 Check_intersection& operator=(const T&)
3355 this->value_ = true;
3363 // Check candidate_odr_violations_ to find symbols with the same name
3364 // but apparently different definitions (different source-file/line-no
3365 // for each line assigned to the first instruction).
3368 Symbol_table::detect_odr_violations(const Task* task,
3369 const char* output_file_name) const
3371 for (Odr_map::const_iterator it = candidate_odr_violations_.begin();
3372 it != candidate_odr_violations_.end();
3375 const char* const symbol_name = it->first;
3377 std::string first_object_name;
3378 std::vector<std::string> first_object_linenos;
3380 Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator
3381 locs = it->second.begin();
3382 const Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator
3383 locs_end = it->second.end();
3384 for (; locs != locs_end && first_object_linenos.empty(); ++locs)
3386 // Save the line numbers from the first definition to
3387 // compare to the other definitions. Ideally, we'd compare
3388 // every definition to every other, but we don't want to
3389 // take O(N^2) time to do this. This shortcut may cause
3390 // false negatives that appear or disappear depending on the
3391 // link order, but it won't cause false positives.
3392 first_object_name = locs->object->name();
3393 first_object_linenos = this->linenos_from_loc(task, *locs);
3395 if (first_object_linenos.empty())
3398 // Sort by Odr_violation_compare to make std::set_intersection work.
3399 std::string first_object_canonical_result = first_object_linenos.back();
3400 std::sort(first_object_linenos.begin(), first_object_linenos.end(),
3401 Odr_violation_compare());
3403 for (; locs != locs_end; ++locs)
3405 std::vector<std::string> linenos =
3406 this->linenos_from_loc(task, *locs);
3407 // linenos will be empty if we couldn't parse the debug info.
3408 if (linenos.empty())
3410 // Sort by Odr_violation_compare to make std::set_intersection work.
3411 gold_assert(!linenos.empty());
3412 std::string second_object_canonical_result = linenos.back();
3413 std::sort(linenos.begin(), linenos.end(), Odr_violation_compare());
3415 Check_intersection intersection_result =
3416 std::set_intersection(first_object_linenos.begin(),
3417 first_object_linenos.end(),
3420 Check_intersection(),
3421 Odr_violation_compare());
3422 if (!intersection_result.had_intersection())
3424 gold_warning(_("while linking %s: symbol '%s' defined in "
3425 "multiple places (possible ODR violation):"),
3426 output_file_name, demangle(symbol_name).c_str());
3427 // This only prints one location from each definition,
3428 // which may not be the location we expect to intersect
3429 // with another definition. We could print the whole
3430 // set of locations, but that seems too verbose.
3431 fprintf(stderr, _(" %s from %s\n"),
3432 first_object_canonical_result.c_str(),
3433 first_object_name.c_str());
3434 fprintf(stderr, _(" %s from %s\n"),
3435 second_object_canonical_result.c_str(),
3436 locs->object->name().c_str());
3437 // Only print one broken pair, to avoid needing to
3438 // compare against a list of the disjoint definition
3439 // locations we've found so far. (If we kept comparing
3440 // against just the first one, we'd get a lot of
3441 // redundant complaints about the second definition
3447 // We only call one_addr2line() in this function, so we can clear its cache.
3448 Dwarf_line_info::clear_addr2line_cache();
3451 // Warnings functions.
3453 // Add a new warning.
3456 Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj,
3457 const std::string& warning)
3459 name = symtab->canonicalize_name(name);
3460 this->warnings_[name].set(obj, warning);
3463 // Look through the warnings and mark the symbols for which we should
3464 // warn. This is called during Layout::finalize when we know the
3465 // sources for all the symbols.
3468 Warnings::note_warnings(Symbol_table* symtab)
3470 for (Warning_table::iterator p = this->warnings_.begin();
3471 p != this->warnings_.end();
3474 Symbol* sym = symtab->lookup(p->first, NULL);
3476 && sym->source() == Symbol::FROM_OBJECT
3477 && sym->object() == p->second.object)
3478 sym->set_has_warning();
3482 // Issue a warning. This is called when we see a relocation against a
3483 // symbol for which has a warning.
3485 template<int size, bool big_endian>
3487 Warnings::issue_warning(const Symbol* sym,
3488 const Relocate_info<size, big_endian>* relinfo,
3489 size_t relnum, off_t reloffset) const
3491 gold_assert(sym->has_warning());
3493 // We don't want to issue a warning for a relocation against the
3494 // symbol in the same object file in which the symbol is defined.
3495 if (sym->object() == relinfo->object)
3498 Warning_table::const_iterator p = this->warnings_.find(sym->name());
3499 gold_assert(p != this->warnings_.end());
3500 gold_warning_at_location(relinfo, relnum, reloffset,
3501 "%s", p->second.text.c_str());
3504 // Instantiate the templates we need. We could use the configure
3505 // script to restrict this to only the ones needed for implemented
3508 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3511 Sized_symbol<32>::allocate_common(Output_data*, Value_type);
3514 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3517 Sized_symbol<64>::allocate_common(Output_data*, Value_type);
3520 #ifdef HAVE_TARGET_32_LITTLE
3523 Symbol_table::add_from_relobj<32, false>(
3524 Sized_relobj_file<32, false>* relobj,
3525 const unsigned char* syms,
3527 size_t symndx_offset,
3528 const char* sym_names,
3529 size_t sym_name_size,
3530 Sized_relobj_file<32, false>::Symbols* sympointers,
3534 #ifdef HAVE_TARGET_32_BIG
3537 Symbol_table::add_from_relobj<32, true>(
3538 Sized_relobj_file<32, true>* relobj,
3539 const unsigned char* syms,
3541 size_t symndx_offset,
3542 const char* sym_names,
3543 size_t sym_name_size,
3544 Sized_relobj_file<32, true>::Symbols* sympointers,
3548 #ifdef HAVE_TARGET_64_LITTLE
3551 Symbol_table::add_from_relobj<64, false>(
3552 Sized_relobj_file<64, false>* relobj,
3553 const unsigned char* syms,
3555 size_t symndx_offset,
3556 const char* sym_names,
3557 size_t sym_name_size,
3558 Sized_relobj_file<64, false>::Symbols* sympointers,
3562 #ifdef HAVE_TARGET_64_BIG
3565 Symbol_table::add_from_relobj<64, true>(
3566 Sized_relobj_file<64, true>* relobj,
3567 const unsigned char* syms,
3569 size_t symndx_offset,
3570 const char* sym_names,
3571 size_t sym_name_size,
3572 Sized_relobj_file<64, true>::Symbols* sympointers,
3576 #ifdef HAVE_TARGET_32_LITTLE
3579 Symbol_table::add_from_pluginobj<32, false>(
3580 Sized_pluginobj<32, false>* obj,
3583 elfcpp::Sym<32, false>* sym);
3586 #ifdef HAVE_TARGET_32_BIG
3589 Symbol_table::add_from_pluginobj<32, true>(
3590 Sized_pluginobj<32, true>* obj,
3593 elfcpp::Sym<32, true>* sym);
3596 #ifdef HAVE_TARGET_64_LITTLE
3599 Symbol_table::add_from_pluginobj<64, false>(
3600 Sized_pluginobj<64, false>* obj,
3603 elfcpp::Sym<64, false>* sym);
3606 #ifdef HAVE_TARGET_64_BIG
3609 Symbol_table::add_from_pluginobj<64, true>(
3610 Sized_pluginobj<64, true>* obj,
3613 elfcpp::Sym<64, true>* sym);
3616 #ifdef HAVE_TARGET_32_LITTLE
3619 Symbol_table::add_from_dynobj<32, false>(
3620 Sized_dynobj<32, false>* dynobj,
3621 const unsigned char* syms,
3623 const char* sym_names,
3624 size_t sym_name_size,
3625 const unsigned char* versym,
3627 const std::vector<const char*>* version_map,
3628 Sized_relobj_file<32, false>::Symbols* sympointers,
3632 #ifdef HAVE_TARGET_32_BIG
3635 Symbol_table::add_from_dynobj<32, true>(
3636 Sized_dynobj<32, true>* dynobj,
3637 const unsigned char* syms,
3639 const char* sym_names,
3640 size_t sym_name_size,
3641 const unsigned char* versym,
3643 const std::vector<const char*>* version_map,
3644 Sized_relobj_file<32, true>::Symbols* sympointers,
3648 #ifdef HAVE_TARGET_64_LITTLE
3651 Symbol_table::add_from_dynobj<64, false>(
3652 Sized_dynobj<64, false>* dynobj,
3653 const unsigned char* syms,
3655 const char* sym_names,
3656 size_t sym_name_size,
3657 const unsigned char* versym,
3659 const std::vector<const char*>* version_map,
3660 Sized_relobj_file<64, false>::Symbols* sympointers,
3664 #ifdef HAVE_TARGET_64_BIG
3667 Symbol_table::add_from_dynobj<64, true>(
3668 Sized_dynobj<64, true>* dynobj,
3669 const unsigned char* syms,
3671 const char* sym_names,
3672 size_t sym_name_size,
3673 const unsigned char* versym,
3675 const std::vector<const char*>* version_map,
3676 Sized_relobj_file<64, true>::Symbols* sympointers,
3680 #ifdef HAVE_TARGET_32_LITTLE
3683 Symbol_table::add_from_incrobj(
3687 elfcpp::Sym<32, false>* sym);
3690 #ifdef HAVE_TARGET_32_BIG
3693 Symbol_table::add_from_incrobj(
3697 elfcpp::Sym<32, true>* sym);
3700 #ifdef HAVE_TARGET_64_LITTLE
3703 Symbol_table::add_from_incrobj(
3707 elfcpp::Sym<64, false>* sym);
3710 #ifdef HAVE_TARGET_64_BIG
3713 Symbol_table::add_from_incrobj(
3717 elfcpp::Sym<64, true>* sym);
3720 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3723 Symbol_table::define_with_copy_reloc<32>(
3724 Sized_symbol<32>* sym,
3726 elfcpp::Elf_types<32>::Elf_Addr value);
3729 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3732 Symbol_table::define_with_copy_reloc<64>(
3733 Sized_symbol<64>* sym,
3735 elfcpp::Elf_types<64>::Elf_Addr value);
3738 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3741 Sized_symbol<32>::init_output_data(const char* name, const char* version,
3742 Output_data* od, Value_type value,
3743 Size_type symsize, elfcpp::STT type,
3744 elfcpp::STB binding,
3745 elfcpp::STV visibility,
3746 unsigned char nonvis,
3747 bool offset_is_from_end,
3748 bool is_predefined);
3751 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3754 Sized_symbol<64>::init_output_data(const char* name, const char* version,
3755 Output_data* od, Value_type value,
3756 Size_type symsize, elfcpp::STT type,
3757 elfcpp::STB binding,
3758 elfcpp::STV visibility,
3759 unsigned char nonvis,
3760 bool offset_is_from_end,
3761 bool is_predefined);
3764 #ifdef HAVE_TARGET_32_LITTLE
3767 Warnings::issue_warning<32, false>(const Symbol* sym,
3768 const Relocate_info<32, false>* relinfo,
3769 size_t relnum, off_t reloffset) const;
3772 #ifdef HAVE_TARGET_32_BIG
3775 Warnings::issue_warning<32, true>(const Symbol* sym,
3776 const Relocate_info<32, true>* relinfo,
3777 size_t relnum, off_t reloffset) const;
3780 #ifdef HAVE_TARGET_64_LITTLE
3783 Warnings::issue_warning<64, false>(const Symbol* sym,
3784 const Relocate_info<64, false>* relinfo,
3785 size_t relnum, off_t reloffset) const;
3788 #ifdef HAVE_TARGET_64_BIG
3791 Warnings::issue_warning<64, true>(const Symbol* sym,
3792 const Relocate_info<64, true>* relinfo,
3793 size_t relnum, off_t reloffset) const;
3796 } // End namespace gold.