1 // symtab.cc -- the gold symbol table
3 // Copyright (C) 2006-2016 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 Value_type value, elfcpp::STT type,
289 elfcpp::STB binding, elfcpp::STV visibility,
290 unsigned char nonvis)
292 this->init_base_undefined(name, version, type, binding, visibility, nonvis);
293 this->value_ = value;
297 // Return an allocated string holding the symbol's name as
298 // name@version. This is used for relocatable links.
301 Symbol::versioned_name() const
303 gold_assert(this->version_ != NULL);
304 std::string ret = this->name_;
308 ret += this->version_;
312 // Return true if SHNDX represents a common symbol.
315 Symbol::is_common_shndx(unsigned int shndx)
317 return (shndx == elfcpp::SHN_COMMON
318 || shndx == parameters->target().small_common_shndx()
319 || shndx == parameters->target().large_common_shndx());
322 // Allocate a common symbol.
326 Sized_symbol<size>::allocate_common(Output_data* od, Value_type value)
328 this->allocate_base_common(od);
329 this->value_ = value;
332 // The ""'s around str ensure str is a string literal, so sizeof works.
333 #define strprefix(var, str) (strncmp(var, str, sizeof("" str "") - 1) == 0)
335 // Return true if this symbol should be added to the dynamic symbol
339 Symbol::should_add_dynsym_entry(Symbol_table* symtab) const
341 // If the symbol is only present on plugin files, the plugin decided we
343 if (!this->in_real_elf())
346 // If the symbol is used by a dynamic relocation, we need to add it.
347 if (this->needs_dynsym_entry())
350 // If this symbol's section is not added, the symbol need not be added.
351 // The section may have been GCed. Note that export_dynamic is being
352 // overridden here. This should not be done for shared objects.
353 if (parameters->options().gc_sections()
354 && !parameters->options().shared()
355 && this->source() == Symbol::FROM_OBJECT
356 && !this->object()->is_dynamic())
358 Relobj* relobj = static_cast<Relobj*>(this->object());
360 unsigned int shndx = this->shndx(&is_ordinary);
361 if (is_ordinary && shndx != elfcpp::SHN_UNDEF
362 && !relobj->is_section_included(shndx)
363 && !symtab->is_section_folded(relobj, shndx))
367 // If the symbol was forced dynamic in a --dynamic-list file
368 // or an --export-dynamic-symbol option, add it.
369 if (!this->is_from_dynobj()
370 && (parameters->options().in_dynamic_list(this->name())
371 || parameters->options().is_export_dynamic_symbol(this->name())))
373 if (!this->is_forced_local())
375 gold_warning(_("Cannot export local symbol '%s'"),
376 this->demangled_name().c_str());
380 // If the symbol was forced local in a version script, do not add it.
381 if (this->is_forced_local())
384 // If dynamic-list-data was specified, add any STT_OBJECT.
385 if (parameters->options().dynamic_list_data()
386 && !this->is_from_dynobj()
387 && this->type() == elfcpp::STT_OBJECT)
390 // If --dynamic-list-cpp-new was specified, add any new/delete symbol.
391 // If --dynamic-list-cpp-typeinfo was specified, add any typeinfo symbols.
392 if ((parameters->options().dynamic_list_cpp_new()
393 || parameters->options().dynamic_list_cpp_typeinfo())
394 && !this->is_from_dynobj())
396 // TODO(csilvers): We could probably figure out if we're an operator
397 // new/delete or typeinfo without the need to demangle.
398 char* demangled_name = cplus_demangle(this->name(),
399 DMGL_ANSI | DMGL_PARAMS);
400 if (demangled_name == NULL)
402 // Not a C++ symbol, so it can't satisfy these flags
404 else if (parameters->options().dynamic_list_cpp_new()
405 && (strprefix(demangled_name, "operator new")
406 || strprefix(demangled_name, "operator delete")))
408 free(demangled_name);
411 else if (parameters->options().dynamic_list_cpp_typeinfo()
412 && (strprefix(demangled_name, "typeinfo name for")
413 || strprefix(demangled_name, "typeinfo for")))
415 free(demangled_name);
419 free(demangled_name);
422 // If exporting all symbols or building a shared library,
423 // or the symbol should be globally unique (GNU_UNIQUE),
424 // and the symbol is defined in a regular object and is
425 // externally visible, we need to add it.
426 if ((parameters->options().export_dynamic()
427 || parameters->options().shared()
428 || (parameters->options().gnu_unique()
429 && this->binding() == elfcpp::STB_GNU_UNIQUE))
430 && !this->is_from_dynobj()
431 && !this->is_undefined()
432 && this->is_externally_visible())
438 // Return true if the final value of this symbol is known at link
442 Symbol::final_value_is_known() const
444 // If we are not generating an executable, then no final values are
445 // known, since they will change at runtime, with the exception of
446 // TLS symbols in a position-independent executable.
447 if ((parameters->options().output_is_position_independent()
448 || parameters->options().relocatable())
449 && !(this->type() == elfcpp::STT_TLS
450 && parameters->options().pie()))
453 // If the symbol is not from an object file, and is not undefined,
454 // then it is defined, and known.
455 if (this->source_ != FROM_OBJECT)
457 if (this->source_ != IS_UNDEFINED)
462 // If the symbol is from a dynamic object, then the final value
464 if (this->object()->is_dynamic())
467 // If the symbol is not undefined (it is defined or common),
468 // then the final value is known.
469 if (!this->is_undefined())
473 // If the symbol is undefined, then whether the final value is known
474 // depends on whether we are doing a static link. If we are doing a
475 // dynamic link, then the final value could be filled in at runtime.
476 // This could reasonably be the case for a weak undefined symbol.
477 return parameters->doing_static_link();
480 // Return the output section where this symbol is defined.
483 Symbol::output_section() const
485 switch (this->source_)
489 unsigned int shndx = this->u_.from_object.shndx;
490 if (shndx != elfcpp::SHN_UNDEF && this->is_ordinary_shndx_)
492 gold_assert(!this->u_.from_object.object->is_dynamic());
493 gold_assert(this->u_.from_object.object->pluginobj() == NULL);
494 Relobj* relobj = static_cast<Relobj*>(this->u_.from_object.object);
495 return relobj->output_section(shndx);
501 return this->u_.in_output_data.output_data->output_section();
503 case IN_OUTPUT_SEGMENT:
513 // Set the symbol's output section. This is used for symbols defined
514 // in scripts. This should only be called after the symbol table has
518 Symbol::set_output_section(Output_section* os)
520 switch (this->source_)
524 gold_assert(this->output_section() == os);
527 this->source_ = IN_OUTPUT_DATA;
528 this->u_.in_output_data.output_data = os;
529 this->u_.in_output_data.offset_is_from_end = false;
531 case IN_OUTPUT_SEGMENT:
538 // Set the symbol's output segment. This is used for pre-defined
539 // symbols whose segments aren't known until after layout is done
540 // (e.g., __ehdr_start).
543 Symbol::set_output_segment(Output_segment* os, Segment_offset_base base)
545 gold_assert(this->is_predefined_);
546 this->source_ = IN_OUTPUT_SEGMENT;
547 this->u_.in_output_segment.output_segment = os;
548 this->u_.in_output_segment.offset_base = base;
551 // Set the symbol to undefined. This is used for pre-defined
552 // symbols whose segments aren't known until after layout is done
553 // (e.g., __ehdr_start).
556 Symbol::set_undefined()
558 this->source_ = IS_UNDEFINED;
559 this->is_predefined_ = false;
562 // Class Symbol_table.
564 Symbol_table::Symbol_table(unsigned int count,
565 const Version_script_info& version_script)
566 : saw_undefined_(0), offset_(0), table_(count), namepool_(),
567 forwarders_(), commons_(), tls_commons_(), small_commons_(),
568 large_commons_(), forced_locals_(), warnings_(),
569 version_script_(version_script), gc_(NULL), icf_(NULL),
572 namepool_.reserve(count);
575 Symbol_table::~Symbol_table()
579 // The symbol table key equality function. This is called with
583 Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1,
584 const Symbol_table_key& k2) const
586 return k1.first == k2.first && k1.second == k2.second;
590 Symbol_table::is_section_folded(Relobj* obj, unsigned int shndx) const
592 return (parameters->options().icf_enabled()
593 && this->icf_->is_section_folded(obj, shndx));
596 // For symbols that have been listed with a -u or --export-dynamic-symbol
597 // option, add them to the work list to avoid gc'ing them.
600 Symbol_table::gc_mark_undef_symbols(Layout* layout)
602 for (options::String_set::const_iterator p =
603 parameters->options().undefined_begin();
604 p != parameters->options().undefined_end();
607 const char* name = p->c_str();
608 Symbol* sym = this->lookup(name);
609 gold_assert(sym != NULL);
610 if (sym->source() == Symbol::FROM_OBJECT
611 && !sym->object()->is_dynamic())
613 this->gc_mark_symbol(sym);
617 for (options::String_set::const_iterator p =
618 parameters->options().export_dynamic_symbol_begin();
619 p != parameters->options().export_dynamic_symbol_end();
622 const char* name = p->c_str();
623 Symbol* sym = this->lookup(name);
624 // It's not an error if a symbol named by --export-dynamic-symbol
627 && sym->source() == Symbol::FROM_OBJECT
628 && !sym->object()->is_dynamic())
630 this->gc_mark_symbol(sym);
634 for (Script_options::referenced_const_iterator p =
635 layout->script_options()->referenced_begin();
636 p != layout->script_options()->referenced_end();
639 Symbol* sym = this->lookup(p->c_str());
640 gold_assert(sym != NULL);
641 if (sym->source() == Symbol::FROM_OBJECT
642 && !sym->object()->is_dynamic())
644 this->gc_mark_symbol(sym);
650 Symbol_table::gc_mark_symbol(Symbol* sym)
652 // Add the object and section to the work list.
654 unsigned int shndx = sym->shndx(&is_ordinary);
655 if (is_ordinary && shndx != elfcpp::SHN_UNDEF && !sym->object()->is_dynamic())
657 gold_assert(this->gc_!= NULL);
658 Relobj* relobj = static_cast<Relobj*>(sym->object());
659 this->gc_->worklist().push_back(Section_id(relobj, shndx));
661 parameters->target().gc_mark_symbol(this, sym);
664 // When doing garbage collection, keep symbols that have been seen in
667 Symbol_table::gc_mark_dyn_syms(Symbol* sym)
669 if (sym->in_dyn() && sym->source() == Symbol::FROM_OBJECT
670 && !sym->object()->is_dynamic())
671 this->gc_mark_symbol(sym);
674 // Make TO a symbol which forwards to FROM.
677 Symbol_table::make_forwarder(Symbol* from, Symbol* to)
679 gold_assert(from != to);
680 gold_assert(!from->is_forwarder() && !to->is_forwarder());
681 this->forwarders_[from] = to;
682 from->set_forwarder();
685 // Resolve the forwards from FROM, returning the real symbol.
688 Symbol_table::resolve_forwards(const Symbol* from) const
690 gold_assert(from->is_forwarder());
691 Unordered_map<const Symbol*, Symbol*>::const_iterator p =
692 this->forwarders_.find(from);
693 gold_assert(p != this->forwarders_.end());
697 // Look up a symbol by name.
700 Symbol_table::lookup(const char* name, const char* version) const
702 Stringpool::Key name_key;
703 name = this->namepool_.find(name, &name_key);
707 Stringpool::Key version_key = 0;
710 version = this->namepool_.find(version, &version_key);
715 Symbol_table_key key(name_key, version_key);
716 Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key);
717 if (p == this->table_.end())
722 // Resolve a Symbol with another Symbol. This is only used in the
723 // unusual case where there are references to both an unversioned
724 // symbol and a symbol with a version, and we then discover that that
725 // version is the default version. Because this is unusual, we do
726 // this the slow way, by converting back to an ELF symbol.
728 template<int size, bool big_endian>
730 Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from)
732 unsigned char buf[elfcpp::Elf_sizes<size>::sym_size];
733 elfcpp::Sym_write<size, big_endian> esym(buf);
734 // We don't bother to set the st_name or the st_shndx field.
735 esym.put_st_value(from->value());
736 esym.put_st_size(from->symsize());
737 esym.put_st_info(from->binding(), from->type());
738 esym.put_st_other(from->visibility(), from->nonvis());
740 unsigned int shndx = from->shndx(&is_ordinary);
741 this->resolve(to, esym.sym(), shndx, is_ordinary, shndx, from->object(),
742 from->version(), true);
747 if (parameters->options().gc_sections())
748 this->gc_mark_dyn_syms(to);
751 // Record that a symbol is forced to be local by a version script or
755 Symbol_table::force_local(Symbol* sym)
757 if (!sym->is_defined() && !sym->is_common())
759 if (sym->is_forced_local())
761 // We already got this one.
764 sym->set_is_forced_local();
765 this->forced_locals_.push_back(sym);
768 // Adjust NAME for wrapping, and update *NAME_KEY if necessary. This
769 // is only called for undefined symbols, when at least one --wrap
773 Symbol_table::wrap_symbol(const char* name, Stringpool::Key* name_key)
775 // For some targets, we need to ignore a specific character when
776 // wrapping, and add it back later.
778 if (name[0] == parameters->target().wrap_char())
784 if (parameters->options().is_wrap(name))
786 // Turn NAME into __wrap_NAME.
793 // This will give us both the old and new name in NAMEPOOL_, but
794 // that is OK. Only the versions we need will wind up in the
795 // real string table in the output file.
796 return this->namepool_.add(s.c_str(), true, name_key);
799 const char* const real_prefix = "__real_";
800 const size_t real_prefix_length = strlen(real_prefix);
801 if (strncmp(name, real_prefix, real_prefix_length) == 0
802 && parameters->options().is_wrap(name + real_prefix_length))
804 // Turn __real_NAME into NAME.
808 s += name + real_prefix_length;
809 return this->namepool_.add(s.c_str(), true, name_key);
815 // This is called when we see a symbol NAME/VERSION, and the symbol
816 // already exists in the symbol table, and VERSION is marked as being
817 // the default version. SYM is the NAME/VERSION symbol we just added.
818 // DEFAULT_IS_NEW is true if this is the first time we have seen the
819 // symbol NAME/NULL. PDEF points to the entry for NAME/NULL.
821 template<int size, bool big_endian>
823 Symbol_table::define_default_version(Sized_symbol<size>* sym,
825 Symbol_table_type::iterator pdef)
829 // This is the first time we have seen NAME/NULL. Make
830 // NAME/NULL point to NAME/VERSION, and mark SYM as the default
833 sym->set_is_default();
835 else if (pdef->second == sym)
837 // NAME/NULL already points to NAME/VERSION. Don't mark the
838 // symbol as the default if it is not already the default.
842 // This is the unfortunate case where we already have entries
843 // for both NAME/VERSION and NAME/NULL. We now see a symbol
844 // NAME/VERSION where VERSION is the default version. We have
845 // already resolved this new symbol with the existing
846 // NAME/VERSION symbol.
848 // It's possible that NAME/NULL and NAME/VERSION are both
849 // defined in regular objects. This can only happen if one
850 // object file defines foo and another defines foo@@ver. This
851 // is somewhat obscure, but we call it a multiple definition
854 // It's possible that NAME/NULL actually has a version, in which
855 // case it won't be the same as VERSION. This happens with
856 // ver_test_7.so in the testsuite for the symbol t2_2. We see
857 // t2_2@@VER2, so we define both t2_2/VER2 and t2_2/NULL. We
858 // then see an unadorned t2_2 in an object file and give it
859 // version VER1 from the version script. This looks like a
860 // default definition for VER1, so it looks like we should merge
861 // t2_2/NULL with t2_2/VER1. That doesn't make sense, but it's
862 // not obvious that this is an error, either. So we just punt.
864 // If one of the symbols has non-default visibility, and the
865 // other is defined in a shared object, then they are different
868 // If the two symbols are from different shared objects,
869 // they are different symbols.
871 // Otherwise, we just resolve the symbols as though they were
874 if (pdef->second->version() != NULL)
875 gold_assert(pdef->second->version() != sym->version());
876 else if (sym->visibility() != elfcpp::STV_DEFAULT
877 && pdef->second->is_from_dynobj())
879 else if (pdef->second->visibility() != elfcpp::STV_DEFAULT
880 && sym->is_from_dynobj())
882 else if (pdef->second->is_from_dynobj()
883 && sym->is_from_dynobj()
884 && pdef->second->object() != sym->object())
888 const Sized_symbol<size>* symdef;
889 symdef = this->get_sized_symbol<size>(pdef->second);
890 Symbol_table::resolve<size, big_endian>(sym, symdef);
891 this->make_forwarder(pdef->second, sym);
893 sym->set_is_default();
898 // Add one symbol from OBJECT to the symbol table. NAME is symbol
899 // name and VERSION is the version; both are canonicalized. DEF is
900 // whether this is the default version. ST_SHNDX is the symbol's
901 // section index; IS_ORDINARY is whether this is a normal section
902 // rather than a special code.
904 // If IS_DEFAULT_VERSION is true, then this is the definition of a
905 // default version of a symbol. That means that any lookup of
906 // NAME/NULL and any lookup of NAME/VERSION should always return the
907 // same symbol. This is obvious for references, but in particular we
908 // want to do this for definitions: overriding NAME/NULL should also
909 // override NAME/VERSION. If we don't do that, it would be very hard
910 // to override functions in a shared library which uses versioning.
912 // We implement this by simply making both entries in the hash table
913 // point to the same Symbol structure. That is easy enough if this is
914 // the first time we see NAME/NULL or NAME/VERSION, but it is possible
915 // that we have seen both already, in which case they will both have
916 // independent entries in the symbol table. We can't simply change
917 // the symbol table entry, because we have pointers to the entries
918 // attached to the object files. So we mark the entry attached to the
919 // object file as a forwarder, and record it in the forwarders_ map.
920 // Note that entries in the hash table will never be marked as
923 // ORIG_ST_SHNDX and ST_SHNDX are almost always the same.
924 // ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF
925 // for a special section code. ST_SHNDX may be modified if the symbol
926 // is defined in a section being discarded.
928 template<int size, bool big_endian>
930 Symbol_table::add_from_object(Object* object,
932 Stringpool::Key name_key,
934 Stringpool::Key version_key,
935 bool is_default_version,
936 const elfcpp::Sym<size, big_endian>& sym,
937 unsigned int st_shndx,
939 unsigned int orig_st_shndx)
941 // Print a message if this symbol is being traced.
942 if (parameters->options().is_trace_symbol(name))
944 if (orig_st_shndx == elfcpp::SHN_UNDEF)
945 gold_info(_("%s: reference to %s"), object->name().c_str(), name);
947 gold_info(_("%s: definition of %s"), object->name().c_str(), name);
950 // For an undefined symbol, we may need to adjust the name using
952 if (orig_st_shndx == elfcpp::SHN_UNDEF
953 && parameters->options().any_wrap())
955 const char* wrap_name = this->wrap_symbol(name, &name_key);
956 if (wrap_name != name)
958 // If we see a reference to malloc with version GLIBC_2.0,
959 // and we turn it into a reference to __wrap_malloc, then we
960 // discard the version number. Otherwise the user would be
961 // required to specify the correct version for
969 Symbol* const snull = NULL;
970 std::pair<typename Symbol_table_type::iterator, bool> ins =
971 this->table_.insert(std::make_pair(std::make_pair(name_key, version_key),
974 std::pair<typename Symbol_table_type::iterator, bool> insdefault =
975 std::make_pair(this->table_.end(), false);
976 if (is_default_version)
978 const Stringpool::Key vnull_key = 0;
979 insdefault = this->table_.insert(std::make_pair(std::make_pair(name_key,
984 // ins.first: an iterator, which is a pointer to a pair.
985 // ins.first->first: the key (a pair of name and version).
986 // ins.first->second: the value (Symbol*).
987 // ins.second: true if new entry was inserted, false if not.
989 Sized_symbol<size>* ret;
994 // We already have an entry for NAME/VERSION.
995 ret = this->get_sized_symbol<size>(ins.first->second);
996 gold_assert(ret != NULL);
998 was_undefined = ret->is_undefined();
999 // Commons from plugins are just placeholders.
1000 was_common = ret->is_common() && ret->object()->pluginobj() == NULL;
1002 this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object,
1003 version, is_default_version);
1004 if (parameters->options().gc_sections())
1005 this->gc_mark_dyn_syms(ret);
1007 if (is_default_version)
1008 this->define_default_version<size, big_endian>(ret, insdefault.second,
1014 && ret->source() == Symbol::FROM_OBJECT
1015 && ret->object() == object
1017 && ret->shndx(&dummy) == st_shndx
1018 && ret->is_default())
1020 // We have seen NAME/VERSION already, and marked it as the
1021 // default version, but now we see a definition for
1022 // NAME/VERSION that is not the default version. This can
1023 // happen when the assembler generates two symbols for
1024 // a symbol as a result of a ".symver foo,foo@VER"
1025 // directive. We see the first unversioned symbol and
1026 // we may mark it as the default version (from a
1027 // version script); then we see the second versioned
1028 // symbol and we need to override the first.
1029 // In any other case, the two symbols should have generated
1030 // a multiple definition error.
1031 // (See PR gold/18703.)
1032 ret->set_is_not_default();
1033 const Stringpool::Key vnull_key = 0;
1034 this->table_.erase(std::make_pair(name_key, vnull_key));
1040 // This is the first time we have seen NAME/VERSION.
1041 gold_assert(ins.first->second == NULL);
1043 if (is_default_version && !insdefault.second)
1045 // We already have an entry for NAME/NULL. If we override
1046 // it, then change it to NAME/VERSION.
1047 ret = this->get_sized_symbol<size>(insdefault.first->second);
1049 was_undefined = ret->is_undefined();
1050 // Commons from plugins are just placeholders.
1051 was_common = ret->is_common() && ret->object()->pluginobj() == NULL;
1053 this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object,
1054 version, is_default_version);
1055 if (parameters->options().gc_sections())
1056 this->gc_mark_dyn_syms(ret);
1057 ins.first->second = ret;
1061 was_undefined = false;
1064 Sized_target<size, big_endian>* target =
1065 parameters->sized_target<size, big_endian>();
1066 if (!target->has_make_symbol())
1067 ret = new Sized_symbol<size>();
1070 ret = target->make_symbol(name, sym.get_st_type(), object,
1071 st_shndx, sym.get_st_value());
1074 // This means that we don't want a symbol table
1076 if (!is_default_version)
1077 this->table_.erase(ins.first);
1080 this->table_.erase(insdefault.first);
1081 // Inserting INSDEFAULT invalidated INS.
1082 this->table_.erase(std::make_pair(name_key,
1089 ret->init_object(name, version, object, sym, st_shndx, is_ordinary);
1091 ins.first->second = ret;
1092 if (is_default_version)
1094 // This is the first time we have seen NAME/NULL. Point
1095 // it at the new entry for NAME/VERSION.
1096 gold_assert(insdefault.second);
1097 insdefault.first->second = ret;
1101 if (is_default_version)
1102 ret->set_is_default();
1105 // Record every time we see a new undefined symbol, to speed up
1107 if (!was_undefined && ret->is_undefined())
1109 ++this->saw_undefined_;
1110 if (parameters->options().has_plugins())
1111 parameters->options().plugins()->new_undefined_symbol(ret);
1114 // Keep track of common symbols, to speed up common symbol
1115 // allocation. Don't record commons from plugin objects;
1116 // we need to wait until we see the real symbol in the
1117 // replacement file.
1118 if (!was_common && ret->is_common() && ret->object()->pluginobj() == NULL)
1120 if (ret->type() == elfcpp::STT_TLS)
1121 this->tls_commons_.push_back(ret);
1122 else if (!is_ordinary
1123 && st_shndx == parameters->target().small_common_shndx())
1124 this->small_commons_.push_back(ret);
1125 else if (!is_ordinary
1126 && st_shndx == parameters->target().large_common_shndx())
1127 this->large_commons_.push_back(ret);
1129 this->commons_.push_back(ret);
1132 // If we're not doing a relocatable link, then any symbol with
1133 // hidden or internal visibility is local.
1134 if ((ret->visibility() == elfcpp::STV_HIDDEN
1135 || ret->visibility() == elfcpp::STV_INTERNAL)
1136 && (ret->binding() == elfcpp::STB_GLOBAL
1137 || ret->binding() == elfcpp::STB_GNU_UNIQUE
1138 || ret->binding() == elfcpp::STB_WEAK)
1139 && !parameters->options().relocatable())
1140 this->force_local(ret);
1145 // Add all the symbols in a relocatable object to the hash table.
1147 template<int size, bool big_endian>
1149 Symbol_table::add_from_relobj(
1150 Sized_relobj_file<size, big_endian>* relobj,
1151 const unsigned char* syms,
1153 size_t symndx_offset,
1154 const char* sym_names,
1155 size_t sym_name_size,
1156 typename Sized_relobj_file<size, big_endian>::Symbols* sympointers,
1161 gold_assert(size == parameters->target().get_size());
1163 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
1165 const bool just_symbols = relobj->just_symbols();
1167 const unsigned char* p = syms;
1168 for (size_t i = 0; i < count; ++i, p += sym_size)
1170 (*sympointers)[i] = NULL;
1172 elfcpp::Sym<size, big_endian> sym(p);
1174 unsigned int st_name = sym.get_st_name();
1175 if (st_name >= sym_name_size)
1177 relobj->error(_("bad global symbol name offset %u at %zu"),
1182 const char* name = sym_names + st_name;
1184 if (!parameters->options().relocatable()
1185 && strcmp (name, "__gnu_lto_slim") == 0)
1186 gold_info(_("%s: plugin needed to handle lto object"),
1187 relobj->name().c_str());
1190 unsigned int st_shndx = relobj->adjust_sym_shndx(i + symndx_offset,
1193 unsigned int orig_st_shndx = st_shndx;
1195 orig_st_shndx = elfcpp::SHN_UNDEF;
1197 if (st_shndx != elfcpp::SHN_UNDEF)
1200 // A symbol defined in a section which we are not including must
1201 // be treated as an undefined symbol.
1202 bool is_defined_in_discarded_section = false;
1203 if (st_shndx != elfcpp::SHN_UNDEF
1205 && !relobj->is_section_included(st_shndx)
1206 && !this->is_section_folded(relobj, st_shndx))
1208 st_shndx = elfcpp::SHN_UNDEF;
1209 is_defined_in_discarded_section = true;
1212 // In an object file, an '@' in the name separates the symbol
1213 // name from the version name. If there are two '@' characters,
1214 // this is the default version.
1215 const char* ver = strchr(name, '@');
1216 Stringpool::Key ver_key = 0;
1218 // IS_DEFAULT_VERSION: is the version default?
1219 // IS_FORCED_LOCAL: is the symbol forced local?
1220 bool is_default_version = false;
1221 bool is_forced_local = false;
1223 // FIXME: For incremental links, we don't store version information,
1224 // so we need to ignore version symbols for now.
1225 if (parameters->incremental_update() && ver != NULL)
1227 namelen = ver - name;
1233 // The symbol name is of the form foo@VERSION or foo@@VERSION
1234 namelen = ver - name;
1238 is_default_version = true;
1241 ver = this->namepool_.add(ver, true, &ver_key);
1243 // We don't want to assign a version to an undefined symbol,
1244 // even if it is listed in the version script. FIXME: What
1245 // about a common symbol?
1248 namelen = strlen(name);
1249 if (!this->version_script_.empty()
1250 && st_shndx != elfcpp::SHN_UNDEF)
1252 // The symbol name did not have a version, but the
1253 // version script may assign a version anyway.
1254 std::string version;
1256 if (this->version_script_.get_symbol_version(name, &version,
1260 is_forced_local = true;
1261 else if (!version.empty())
1263 ver = this->namepool_.add_with_length(version.c_str(),
1267 is_default_version = true;
1273 elfcpp::Sym<size, big_endian>* psym = &sym;
1274 unsigned char symbuf[sym_size];
1275 elfcpp::Sym<size, big_endian> sym2(symbuf);
1278 memcpy(symbuf, p, sym_size);
1279 elfcpp::Sym_write<size, big_endian> sw(symbuf);
1280 if (orig_st_shndx != elfcpp::SHN_UNDEF
1282 && relobj->e_type() == elfcpp::ET_REL)
1284 // Symbol values in relocatable object files are section
1285 // relative. This is normally what we want, but since here
1286 // we are converting the symbol to absolute we need to add
1287 // the section address. The section address in an object
1288 // file is normally zero, but people can use a linker
1289 // script to change it.
1290 sw.put_st_value(sym.get_st_value()
1291 + relobj->section_address(orig_st_shndx));
1293 st_shndx = elfcpp::SHN_ABS;
1294 is_ordinary = false;
1298 // Fix up visibility if object has no-export set.
1299 if (relobj->no_export()
1300 && (orig_st_shndx != elfcpp::SHN_UNDEF || !is_ordinary))
1302 // We may have copied symbol already above.
1305 memcpy(symbuf, p, sym_size);
1309 elfcpp::STV visibility = sym2.get_st_visibility();
1310 if (visibility == elfcpp::STV_DEFAULT
1311 || visibility == elfcpp::STV_PROTECTED)
1313 elfcpp::Sym_write<size, big_endian> sw(symbuf);
1314 unsigned char nonvis = sym2.get_st_nonvis();
1315 sw.put_st_other(elfcpp::STV_HIDDEN, nonvis);
1319 Stringpool::Key name_key;
1320 name = this->namepool_.add_with_length(name, namelen, true,
1323 Sized_symbol<size>* res;
1324 res = this->add_from_object(relobj, name, name_key, ver, ver_key,
1325 is_default_version, *psym, st_shndx,
1326 is_ordinary, orig_st_shndx);
1328 if (is_forced_local)
1329 this->force_local(res);
1331 // Do not treat this symbol as garbage if this symbol will be
1332 // exported to the dynamic symbol table. This is true when
1333 // building a shared library or using --export-dynamic and
1334 // the symbol is externally visible.
1335 if (parameters->options().gc_sections()
1336 && res->is_externally_visible()
1337 && !res->is_from_dynobj()
1338 && (parameters->options().shared()
1339 || parameters->options().export_dynamic()
1340 || parameters->options().in_dynamic_list(res->name())))
1341 this->gc_mark_symbol(res);
1343 if (is_defined_in_discarded_section)
1344 res->set_is_defined_in_discarded_section();
1346 (*sympointers)[i] = res;
1350 // Add a symbol from a plugin-claimed file.
1352 template<int size, bool big_endian>
1354 Symbol_table::add_from_pluginobj(
1355 Sized_pluginobj<size, big_endian>* obj,
1358 elfcpp::Sym<size, big_endian>* sym)
1360 unsigned int st_shndx = sym->get_st_shndx();
1361 bool is_ordinary = st_shndx < elfcpp::SHN_LORESERVE;
1363 Stringpool::Key ver_key = 0;
1364 bool is_default_version = false;
1365 bool is_forced_local = false;
1369 ver = this->namepool_.add(ver, true, &ver_key);
1371 // We don't want to assign a version to an undefined symbol,
1372 // even if it is listed in the version script. FIXME: What
1373 // about a common symbol?
1376 if (!this->version_script_.empty()
1377 && st_shndx != elfcpp::SHN_UNDEF)
1379 // The symbol name did not have a version, but the
1380 // version script may assign a version anyway.
1381 std::string version;
1383 if (this->version_script_.get_symbol_version(name, &version,
1387 is_forced_local = true;
1388 else if (!version.empty())
1390 ver = this->namepool_.add_with_length(version.c_str(),
1394 is_default_version = true;
1400 Stringpool::Key name_key;
1401 name = this->namepool_.add(name, true, &name_key);
1403 Sized_symbol<size>* res;
1404 res = this->add_from_object(obj, name, name_key, ver, ver_key,
1405 is_default_version, *sym, st_shndx,
1406 is_ordinary, st_shndx);
1408 if (is_forced_local)
1409 this->force_local(res);
1414 // Add all the symbols in a dynamic object to the hash table.
1416 template<int size, bool big_endian>
1418 Symbol_table::add_from_dynobj(
1419 Sized_dynobj<size, big_endian>* dynobj,
1420 const unsigned char* syms,
1422 const char* sym_names,
1423 size_t sym_name_size,
1424 const unsigned char* versym,
1426 const std::vector<const char*>* version_map,
1427 typename Sized_relobj_file<size, big_endian>::Symbols* sympointers,
1432 gold_assert(size == parameters->target().get_size());
1434 if (dynobj->just_symbols())
1436 gold_error(_("--just-symbols does not make sense with a shared object"));
1440 // FIXME: For incremental links, we don't store version information,
1441 // so we need to ignore version symbols for now.
1442 if (parameters->incremental_update())
1445 if (versym != NULL && versym_size / 2 < count)
1447 dynobj->error(_("too few symbol versions"));
1451 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
1453 // We keep a list of all STT_OBJECT symbols, so that we can resolve
1454 // weak aliases. This is necessary because if the dynamic object
1455 // provides the same variable under two names, one of which is a
1456 // weak definition, and the regular object refers to the weak
1457 // definition, we have to put both the weak definition and the
1458 // strong definition into the dynamic symbol table. Given a weak
1459 // definition, the only way that we can find the corresponding
1460 // strong definition, if any, is to search the symbol table.
1461 std::vector<Sized_symbol<size>*> object_symbols;
1463 const unsigned char* p = syms;
1464 const unsigned char* vs = versym;
1465 for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2)
1467 elfcpp::Sym<size, big_endian> sym(p);
1469 if (sympointers != NULL)
1470 (*sympointers)[i] = NULL;
1472 // Ignore symbols with local binding or that have
1473 // internal or hidden visibility.
1474 if (sym.get_st_bind() == elfcpp::STB_LOCAL
1475 || sym.get_st_visibility() == elfcpp::STV_INTERNAL
1476 || sym.get_st_visibility() == elfcpp::STV_HIDDEN)
1479 // A protected symbol in a shared library must be treated as a
1480 // normal symbol when viewed from outside the shared library.
1481 // Implement this by overriding the visibility here.
1482 // Likewise, an IFUNC symbol in a shared library must be treated
1483 // as a normal FUNC symbol.
1484 elfcpp::Sym<size, big_endian>* psym = &sym;
1485 unsigned char symbuf[sym_size];
1486 elfcpp::Sym<size, big_endian> sym2(symbuf);
1487 if (sym.get_st_visibility() == elfcpp::STV_PROTECTED
1488 || sym.get_st_type() == elfcpp::STT_GNU_IFUNC)
1490 memcpy(symbuf, p, sym_size);
1491 elfcpp::Sym_write<size, big_endian> sw(symbuf);
1492 if (sym.get_st_visibility() == elfcpp::STV_PROTECTED)
1493 sw.put_st_other(elfcpp::STV_DEFAULT, sym.get_st_nonvis());
1494 if (sym.get_st_type() == elfcpp::STT_GNU_IFUNC)
1495 sw.put_st_info(sym.get_st_bind(), elfcpp::STT_FUNC);
1499 unsigned int st_name = psym->get_st_name();
1500 if (st_name >= sym_name_size)
1502 dynobj->error(_("bad symbol name offset %u at %zu"),
1507 const char* name = sym_names + st_name;
1510 unsigned int st_shndx = dynobj->adjust_sym_shndx(i, psym->get_st_shndx(),
1513 if (st_shndx != elfcpp::SHN_UNDEF)
1516 Sized_symbol<size>* res;
1520 Stringpool::Key name_key;
1521 name = this->namepool_.add(name, true, &name_key);
1522 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
1523 false, *psym, st_shndx, is_ordinary,
1528 // Read the version information.
1530 unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs);
1532 bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0;
1533 v &= elfcpp::VERSYM_VERSION;
1535 // The Sun documentation says that V can be VER_NDX_LOCAL,
1536 // or VER_NDX_GLOBAL, or a version index. The meaning of
1537 // VER_NDX_LOCAL is defined as "Symbol has local scope."
1538 // The old GNU linker will happily generate VER_NDX_LOCAL
1539 // for an undefined symbol. I don't know what the Sun
1540 // linker will generate.
1542 if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL)
1543 && st_shndx != elfcpp::SHN_UNDEF)
1545 // This symbol should not be visible outside the object.
1549 // At this point we are definitely going to add this symbol.
1550 Stringpool::Key name_key;
1551 name = this->namepool_.add(name, true, &name_key);
1553 if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL)
1554 || v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL))
1556 // This symbol does not have a version.
1557 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
1558 false, *psym, st_shndx, is_ordinary,
1563 if (v >= version_map->size())
1565 dynobj->error(_("versym for symbol %zu out of range: %u"),
1570 const char* version = (*version_map)[v];
1571 if (version == NULL)
1573 dynobj->error(_("versym for symbol %zu has no name: %u"),
1578 Stringpool::Key version_key;
1579 version = this->namepool_.add(version, true, &version_key);
1581 // If this is an absolute symbol, and the version name
1582 // and symbol name are the same, then this is the
1583 // version definition symbol. These symbols exist to
1584 // support using -u to pull in particular versions. We
1585 // do not want to record a version for them.
1586 if (st_shndx == elfcpp::SHN_ABS
1588 && name_key == version_key)
1589 res = this->add_from_object(dynobj, name, name_key, NULL, 0,
1590 false, *psym, st_shndx, is_ordinary,
1594 const bool is_default_version =
1595 !hidden && st_shndx != elfcpp::SHN_UNDEF;
1596 res = this->add_from_object(dynobj, name, name_key, version,
1597 version_key, is_default_version,
1599 is_ordinary, st_shndx);
1604 // Note that it is possible that RES was overridden by an
1605 // earlier object, in which case it can't be aliased here.
1606 if (st_shndx != elfcpp::SHN_UNDEF
1608 && psym->get_st_type() == elfcpp::STT_OBJECT
1609 && res->source() == Symbol::FROM_OBJECT
1610 && res->object() == dynobj)
1611 object_symbols.push_back(res);
1613 if (sympointers != NULL)
1614 (*sympointers)[i] = res;
1617 this->record_weak_aliases(&object_symbols);
1620 // Add a symbol from a incremental object file.
1622 template<int size, bool big_endian>
1624 Symbol_table::add_from_incrobj(
1628 elfcpp::Sym<size, big_endian>* sym)
1630 unsigned int st_shndx = sym->get_st_shndx();
1631 bool is_ordinary = st_shndx < elfcpp::SHN_LORESERVE;
1633 Stringpool::Key ver_key = 0;
1634 bool is_default_version = false;
1635 bool is_forced_local = false;
1637 Stringpool::Key name_key;
1638 name = this->namepool_.add(name, true, &name_key);
1640 Sized_symbol<size>* res;
1641 res = this->add_from_object(obj, name, name_key, ver, ver_key,
1642 is_default_version, *sym, st_shndx,
1643 is_ordinary, st_shndx);
1645 if (is_forced_local)
1646 this->force_local(res);
1651 // This is used to sort weak aliases. We sort them first by section
1652 // index, then by offset, then by weak ahead of strong.
1655 class Weak_alias_sorter
1658 bool operator()(const Sized_symbol<size>*, const Sized_symbol<size>*) const;
1663 Weak_alias_sorter<size>::operator()(const Sized_symbol<size>* s1,
1664 const Sized_symbol<size>* s2) const
1667 unsigned int s1_shndx = s1->shndx(&is_ordinary);
1668 gold_assert(is_ordinary);
1669 unsigned int s2_shndx = s2->shndx(&is_ordinary);
1670 gold_assert(is_ordinary);
1671 if (s1_shndx != s2_shndx)
1672 return s1_shndx < s2_shndx;
1674 if (s1->value() != s2->value())
1675 return s1->value() < s2->value();
1676 if (s1->binding() != s2->binding())
1678 if (s1->binding() == elfcpp::STB_WEAK)
1680 if (s2->binding() == elfcpp::STB_WEAK)
1683 return std::string(s1->name()) < std::string(s2->name());
1686 // SYMBOLS is a list of object symbols from a dynamic object. Look
1687 // for any weak aliases, and record them so that if we add the weak
1688 // alias to the dynamic symbol table, we also add the corresponding
1693 Symbol_table::record_weak_aliases(std::vector<Sized_symbol<size>*>* symbols)
1695 // Sort the vector by section index, then by offset, then by weak
1697 std::sort(symbols->begin(), symbols->end(), Weak_alias_sorter<size>());
1699 // Walk through the vector. For each weak definition, record
1701 for (typename std::vector<Sized_symbol<size>*>::const_iterator p =
1703 p != symbols->end();
1706 if ((*p)->binding() != elfcpp::STB_WEAK)
1709 // Build a circular list of weak aliases. Each symbol points to
1710 // the next one in the circular list.
1712 Sized_symbol<size>* from_sym = *p;
1713 typename std::vector<Sized_symbol<size>*>::const_iterator q;
1714 for (q = p + 1; q != symbols->end(); ++q)
1717 if ((*q)->shndx(&dummy) != from_sym->shndx(&dummy)
1718 || (*q)->value() != from_sym->value())
1721 this->weak_aliases_[from_sym] = *q;
1722 from_sym->set_has_alias();
1728 this->weak_aliases_[from_sym] = *p;
1729 from_sym->set_has_alias();
1736 // Create and return a specially defined symbol. If ONLY_IF_REF is
1737 // true, then only create the symbol if there is a reference to it.
1738 // If this does not return NULL, it sets *POLDSYM to the existing
1739 // symbol if there is one. This sets *RESOLVE_OLDSYM if we should
1740 // resolve the newly created symbol to the old one. This
1741 // canonicalizes *PNAME and *PVERSION.
1743 template<int size, bool big_endian>
1745 Symbol_table::define_special_symbol(const char** pname, const char** pversion,
1747 Sized_symbol<size>** poldsym,
1748 bool* resolve_oldsym)
1750 *resolve_oldsym = false;
1753 // If the caller didn't give us a version, see if we get one from
1754 // the version script.
1756 bool is_default_version = false;
1757 if (*pversion == NULL)
1760 if (this->version_script_.get_symbol_version(*pname, &v, &is_global))
1762 if (is_global && !v.empty())
1764 *pversion = v.c_str();
1765 // If we get the version from a version script, then we
1766 // are also the default version.
1767 is_default_version = true;
1773 Sized_symbol<size>* sym;
1775 bool add_to_table = false;
1776 typename Symbol_table_type::iterator add_loc = this->table_.end();
1777 bool add_def_to_table = false;
1778 typename Symbol_table_type::iterator add_def_loc = this->table_.end();
1782 oldsym = this->lookup(*pname, *pversion);
1783 if (oldsym == NULL && is_default_version)
1784 oldsym = this->lookup(*pname, NULL);
1785 if (oldsym == NULL || !oldsym->is_undefined())
1788 *pname = oldsym->name();
1789 if (is_default_version)
1790 *pversion = this->namepool_.add(*pversion, true, NULL);
1792 *pversion = oldsym->version();
1796 // Canonicalize NAME and VERSION.
1797 Stringpool::Key name_key;
1798 *pname = this->namepool_.add(*pname, true, &name_key);
1800 Stringpool::Key version_key = 0;
1801 if (*pversion != NULL)
1802 *pversion = this->namepool_.add(*pversion, true, &version_key);
1804 Symbol* const snull = NULL;
1805 std::pair<typename Symbol_table_type::iterator, bool> ins =
1806 this->table_.insert(std::make_pair(std::make_pair(name_key,
1810 std::pair<typename Symbol_table_type::iterator, bool> insdefault =
1811 std::make_pair(this->table_.end(), false);
1812 if (is_default_version)
1814 const Stringpool::Key vnull = 0;
1816 this->table_.insert(std::make_pair(std::make_pair(name_key,
1823 // We already have a symbol table entry for NAME/VERSION.
1824 oldsym = ins.first->second;
1825 gold_assert(oldsym != NULL);
1827 if (is_default_version)
1829 Sized_symbol<size>* soldsym =
1830 this->get_sized_symbol<size>(oldsym);
1831 this->define_default_version<size, big_endian>(soldsym,
1838 // We haven't seen this symbol before.
1839 gold_assert(ins.first->second == NULL);
1841 add_to_table = true;
1842 add_loc = ins.first;
1844 if (is_default_version && !insdefault.second)
1846 // We are adding NAME/VERSION, and it is the default
1847 // version. We already have an entry for NAME/NULL.
1848 oldsym = insdefault.first->second;
1849 *resolve_oldsym = true;
1855 if (is_default_version)
1857 add_def_to_table = true;
1858 add_def_loc = insdefault.first;
1864 const Target& target = parameters->target();
1865 if (!target.has_make_symbol())
1866 sym = new Sized_symbol<size>();
1869 Sized_target<size, big_endian>* sized_target =
1870 parameters->sized_target<size, big_endian>();
1871 sym = sized_target->make_symbol(*pname, elfcpp::STT_NOTYPE,
1872 NULL, elfcpp::SHN_UNDEF, 0);
1878 add_loc->second = sym;
1880 gold_assert(oldsym != NULL);
1882 if (add_def_to_table)
1883 add_def_loc->second = sym;
1885 *poldsym = this->get_sized_symbol<size>(oldsym);
1890 // Define a symbol based on an Output_data.
1893 Symbol_table::define_in_output_data(const char* name,
1894 const char* version,
1900 elfcpp::STB binding,
1901 elfcpp::STV visibility,
1902 unsigned char nonvis,
1903 bool offset_is_from_end,
1906 if (parameters->target().get_size() == 32)
1908 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1909 return this->do_define_in_output_data<32>(name, version, defined, od,
1910 value, symsize, type, binding,
1918 else if (parameters->target().get_size() == 64)
1920 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1921 return this->do_define_in_output_data<64>(name, version, defined, od,
1922 value, symsize, type, binding,
1934 // Define a symbol in an Output_data, sized version.
1938 Symbol_table::do_define_in_output_data(
1940 const char* version,
1943 typename elfcpp::Elf_types<size>::Elf_Addr value,
1944 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
1946 elfcpp::STB binding,
1947 elfcpp::STV visibility,
1948 unsigned char nonvis,
1949 bool offset_is_from_end,
1952 Sized_symbol<size>* sym;
1953 Sized_symbol<size>* oldsym;
1954 bool resolve_oldsym;
1956 if (parameters->target().is_big_endian())
1958 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
1959 sym = this->define_special_symbol<size, true>(&name, &version,
1960 only_if_ref, &oldsym,
1968 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
1969 sym = this->define_special_symbol<size, false>(&name, &version,
1970 only_if_ref, &oldsym,
1980 sym->init_output_data(name, version, od, value, symsize, type, binding,
1981 visibility, nonvis, offset_is_from_end,
1982 defined == PREDEFINED);
1986 if (binding == elfcpp::STB_LOCAL
1987 || this->version_script_.symbol_is_local(name))
1988 this->force_local(sym);
1989 else if (version != NULL)
1990 sym->set_is_default();
1994 if (Symbol_table::should_override_with_special(oldsym, type, defined))
1995 this->override_with_special(oldsym, sym);
2001 if (defined == PREDEFINED
2002 && (binding == elfcpp::STB_LOCAL
2003 || this->version_script_.symbol_is_local(name)))
2004 this->force_local(oldsym);
2010 // Define a symbol based on an Output_segment.
2013 Symbol_table::define_in_output_segment(const char* name,
2014 const char* version,
2020 elfcpp::STB binding,
2021 elfcpp::STV visibility,
2022 unsigned char nonvis,
2023 Symbol::Segment_offset_base offset_base,
2026 if (parameters->target().get_size() == 32)
2028 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2029 return this->do_define_in_output_segment<32>(name, version, defined, os,
2030 value, symsize, type,
2031 binding, visibility, nonvis,
2032 offset_base, only_if_ref);
2037 else if (parameters->target().get_size() == 64)
2039 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2040 return this->do_define_in_output_segment<64>(name, version, defined, os,
2041 value, symsize, type,
2042 binding, visibility, nonvis,
2043 offset_base, only_if_ref);
2052 // Define a symbol in an Output_segment, sized version.
2056 Symbol_table::do_define_in_output_segment(
2058 const char* version,
2061 typename elfcpp::Elf_types<size>::Elf_Addr value,
2062 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
2064 elfcpp::STB binding,
2065 elfcpp::STV visibility,
2066 unsigned char nonvis,
2067 Symbol::Segment_offset_base offset_base,
2070 Sized_symbol<size>* sym;
2071 Sized_symbol<size>* oldsym;
2072 bool resolve_oldsym;
2074 if (parameters->target().is_big_endian())
2076 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2077 sym = this->define_special_symbol<size, true>(&name, &version,
2078 only_if_ref, &oldsym,
2086 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2087 sym = this->define_special_symbol<size, false>(&name, &version,
2088 only_if_ref, &oldsym,
2098 sym->init_output_segment(name, version, os, value, symsize, type, binding,
2099 visibility, nonvis, offset_base,
2100 defined == PREDEFINED);
2104 if (binding == elfcpp::STB_LOCAL
2105 || this->version_script_.symbol_is_local(name))
2106 this->force_local(sym);
2107 else if (version != NULL)
2108 sym->set_is_default();
2112 if (Symbol_table::should_override_with_special(oldsym, type, defined))
2113 this->override_with_special(oldsym, sym);
2119 if (binding == elfcpp::STB_LOCAL
2120 || this->version_script_.symbol_is_local(name))
2121 this->force_local(oldsym);
2127 // Define a special symbol with a constant value. It is a multiple
2128 // definition error if this symbol is already defined.
2131 Symbol_table::define_as_constant(const char* name,
2132 const char* version,
2137 elfcpp::STB binding,
2138 elfcpp::STV visibility,
2139 unsigned char nonvis,
2141 bool force_override)
2143 if (parameters->target().get_size() == 32)
2145 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2146 return this->do_define_as_constant<32>(name, version, defined, value,
2147 symsize, type, binding,
2148 visibility, nonvis, only_if_ref,
2154 else if (parameters->target().get_size() == 64)
2156 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2157 return this->do_define_as_constant<64>(name, version, defined, value,
2158 symsize, type, binding,
2159 visibility, nonvis, only_if_ref,
2169 // Define a symbol as a constant, sized version.
2173 Symbol_table::do_define_as_constant(
2175 const char* version,
2177 typename elfcpp::Elf_types<size>::Elf_Addr value,
2178 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
2180 elfcpp::STB binding,
2181 elfcpp::STV visibility,
2182 unsigned char nonvis,
2184 bool force_override)
2186 Sized_symbol<size>* sym;
2187 Sized_symbol<size>* oldsym;
2188 bool resolve_oldsym;
2190 if (parameters->target().is_big_endian())
2192 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2193 sym = this->define_special_symbol<size, true>(&name, &version,
2194 only_if_ref, &oldsym,
2202 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2203 sym = this->define_special_symbol<size, false>(&name, &version,
2204 only_if_ref, &oldsym,
2214 sym->init_constant(name, version, value, symsize, type, binding, visibility,
2215 nonvis, defined == PREDEFINED);
2219 // Version symbols are absolute symbols with name == version.
2220 // We don't want to force them to be local.
2221 if ((version == NULL
2224 && (binding == elfcpp::STB_LOCAL
2225 || this->version_script_.symbol_is_local(name)))
2226 this->force_local(sym);
2227 else if (version != NULL
2228 && (name != version || value != 0))
2229 sym->set_is_default();
2234 || Symbol_table::should_override_with_special(oldsym, type, defined))
2235 this->override_with_special(oldsym, sym);
2241 if (binding == elfcpp::STB_LOCAL
2242 || this->version_script_.symbol_is_local(name))
2243 this->force_local(oldsym);
2249 // Define a set of symbols in output sections.
2252 Symbol_table::define_symbols(const Layout* layout, int count,
2253 const Define_symbol_in_section* p,
2256 for (int i = 0; i < count; ++i, ++p)
2258 Output_section* os = layout->find_output_section(p->output_section);
2260 this->define_in_output_data(p->name, NULL, PREDEFINED, os, p->value,
2261 p->size, p->type, p->binding,
2262 p->visibility, p->nonvis,
2263 p->offset_is_from_end,
2264 only_if_ref || p->only_if_ref);
2266 this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size,
2267 p->type, p->binding, p->visibility, p->nonvis,
2268 only_if_ref || p->only_if_ref,
2273 // Define a set of symbols in output segments.
2276 Symbol_table::define_symbols(const Layout* layout, int count,
2277 const Define_symbol_in_segment* p,
2280 for (int i = 0; i < count; ++i, ++p)
2282 Output_segment* os = layout->find_output_segment(p->segment_type,
2283 p->segment_flags_set,
2284 p->segment_flags_clear);
2286 this->define_in_output_segment(p->name, NULL, PREDEFINED, os, p->value,
2287 p->size, p->type, p->binding,
2288 p->visibility, p->nonvis,
2290 only_if_ref || p->only_if_ref);
2292 this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size,
2293 p->type, p->binding, p->visibility, p->nonvis,
2294 only_if_ref || p->only_if_ref,
2299 // Define CSYM using a COPY reloc. POSD is the Output_data where the
2300 // symbol should be defined--typically a .dyn.bss section. VALUE is
2301 // the offset within POSD.
2305 Symbol_table::define_with_copy_reloc(
2306 Sized_symbol<size>* csym,
2308 typename elfcpp::Elf_types<size>::Elf_Addr value)
2310 gold_assert(csym->is_from_dynobj());
2311 gold_assert(!csym->is_copied_from_dynobj());
2312 Object* object = csym->object();
2313 gold_assert(object->is_dynamic());
2314 Dynobj* dynobj = static_cast<Dynobj*>(object);
2316 // Our copied variable has to override any variable in a shared
2318 elfcpp::STB binding = csym->binding();
2319 if (binding == elfcpp::STB_WEAK)
2320 binding = elfcpp::STB_GLOBAL;
2322 this->define_in_output_data(csym->name(), csym->version(), COPY,
2323 posd, value, csym->symsize(),
2324 csym->type(), binding,
2325 csym->visibility(), csym->nonvis(),
2328 csym->set_is_copied_from_dynobj();
2329 csym->set_needs_dynsym_entry();
2331 this->copied_symbol_dynobjs_[csym] = dynobj;
2333 // We have now defined all aliases, but we have not entered them all
2334 // in the copied_symbol_dynobjs_ map.
2335 if (csym->has_alias())
2340 sym = this->weak_aliases_[sym];
2343 gold_assert(sym->output_data() == posd);
2345 sym->set_is_copied_from_dynobj();
2346 this->copied_symbol_dynobjs_[sym] = dynobj;
2351 // SYM is defined using a COPY reloc. Return the dynamic object where
2352 // the original definition was found.
2355 Symbol_table::get_copy_source(const Symbol* sym) const
2357 gold_assert(sym->is_copied_from_dynobj());
2358 Copied_symbol_dynobjs::const_iterator p =
2359 this->copied_symbol_dynobjs_.find(sym);
2360 gold_assert(p != this->copied_symbol_dynobjs_.end());
2364 // Add any undefined symbols named on the command line.
2367 Symbol_table::add_undefined_symbols_from_command_line(Layout* layout)
2369 if (parameters->options().any_undefined()
2370 || layout->script_options()->any_unreferenced())
2372 if (parameters->target().get_size() == 32)
2374 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
2375 this->do_add_undefined_symbols_from_command_line<32>(layout);
2380 else if (parameters->target().get_size() == 64)
2382 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
2383 this->do_add_undefined_symbols_from_command_line<64>(layout);
2395 Symbol_table::do_add_undefined_symbols_from_command_line(Layout* layout)
2397 for (options::String_set::const_iterator p =
2398 parameters->options().undefined_begin();
2399 p != parameters->options().undefined_end();
2401 this->add_undefined_symbol_from_command_line<size>(p->c_str());
2403 for (options::String_set::const_iterator p =
2404 parameters->options().export_dynamic_symbol_begin();
2405 p != parameters->options().export_dynamic_symbol_end();
2407 this->add_undefined_symbol_from_command_line<size>(p->c_str());
2409 for (Script_options::referenced_const_iterator p =
2410 layout->script_options()->referenced_begin();
2411 p != layout->script_options()->referenced_end();
2413 this->add_undefined_symbol_from_command_line<size>(p->c_str());
2418 Symbol_table::add_undefined_symbol_from_command_line(const char* name)
2420 if (this->lookup(name) != NULL)
2423 const char* version = NULL;
2425 Sized_symbol<size>* sym;
2426 Sized_symbol<size>* oldsym;
2427 bool resolve_oldsym;
2428 if (parameters->target().is_big_endian())
2430 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
2431 sym = this->define_special_symbol<size, true>(&name, &version,
2440 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
2441 sym = this->define_special_symbol<size, false>(&name, &version,
2449 gold_assert(oldsym == NULL);
2451 sym->init_undefined(name, version, 0, elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
2452 elfcpp::STV_DEFAULT, 0);
2453 ++this->saw_undefined_;
2456 // Set the dynamic symbol indexes. INDEX is the index of the first
2457 // global dynamic symbol. Pointers to the symbols are stored into the
2458 // vector SYMS. The names are added to DYNPOOL. This returns an
2459 // updated dynamic symbol index.
2462 Symbol_table::set_dynsym_indexes(unsigned int index,
2463 std::vector<Symbol*>* syms,
2464 Stringpool* dynpool,
2467 std::vector<Symbol*> as_needed_sym;
2469 // Allow a target to set dynsym indexes.
2470 if (parameters->target().has_custom_set_dynsym_indexes())
2472 std::vector<Symbol*> dyn_symbols;
2473 for (Symbol_table_type::iterator p = this->table_.begin();
2474 p != this->table_.end();
2477 Symbol* sym = p->second;
2478 if (!sym->should_add_dynsym_entry(this))
2479 sym->set_dynsym_index(-1U);
2481 dyn_symbols.push_back(sym);
2484 return parameters->target().set_dynsym_indexes(&dyn_symbols, index, syms,
2485 dynpool, versions, this);
2488 for (Symbol_table_type::iterator p = this->table_.begin();
2489 p != this->table_.end();
2492 Symbol* sym = p->second;
2494 // Note that SYM may already have a dynamic symbol index, since
2495 // some symbols appear more than once in the symbol table, with
2496 // and without a version.
2498 if (!sym->should_add_dynsym_entry(this))
2499 sym->set_dynsym_index(-1U);
2500 else if (!sym->has_dynsym_index())
2502 sym->set_dynsym_index(index);
2504 syms->push_back(sym);
2505 dynpool->add(sym->name(), false, NULL);
2507 // If the symbol is defined in a dynamic object and is
2508 // referenced strongly in a regular object, then mark the
2509 // dynamic object as needed. This is used to implement
2511 if (sym->is_from_dynobj()
2513 && !sym->is_undef_binding_weak())
2514 sym->object()->set_is_needed();
2516 // Record any version information, except those from
2517 // as-needed libraries not seen to be needed. Note that the
2518 // is_needed state for such libraries can change in this loop.
2519 if (sym->version() != NULL)
2521 if (!sym->is_from_dynobj()
2522 || !sym->object()->as_needed()
2523 || sym->object()->is_needed())
2524 versions->record_version(this, dynpool, sym);
2526 as_needed_sym.push_back(sym);
2531 // Process version information for symbols from as-needed libraries.
2532 for (std::vector<Symbol*>::iterator p = as_needed_sym.begin();
2533 p != as_needed_sym.end();
2538 if (sym->object()->is_needed())
2539 versions->record_version(this, dynpool, sym);
2541 sym->clear_version();
2544 // Finish up the versions. In some cases this may add new dynamic
2546 index = versions->finalize(this, index, syms);
2548 // Process target-specific symbols.
2549 for (std::vector<Symbol*>::iterator p = this->target_symbols_.begin();
2550 p != this->target_symbols_.end();
2553 (*p)->set_dynsym_index(index);
2555 syms->push_back(*p);
2556 dynpool->add((*p)->name(), false, NULL);
2562 // Set the final values for all the symbols. The index of the first
2563 // global symbol in the output file is *PLOCAL_SYMCOUNT. Record the
2564 // file offset OFF. Add their names to POOL. Return the new file
2565 // offset. Update *PLOCAL_SYMCOUNT if necessary.
2568 Symbol_table::finalize(off_t off, off_t dynoff, size_t dyn_global_index,
2569 size_t dyncount, Stringpool* pool,
2570 unsigned int* plocal_symcount)
2574 gold_assert(*plocal_symcount != 0);
2575 this->first_global_index_ = *plocal_symcount;
2577 this->dynamic_offset_ = dynoff;
2578 this->first_dynamic_global_index_ = dyn_global_index;
2579 this->dynamic_count_ = dyncount;
2581 if (parameters->target().get_size() == 32)
2583 #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE)
2584 ret = this->sized_finalize<32>(off, pool, plocal_symcount);
2589 else if (parameters->target().get_size() == 64)
2591 #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE)
2592 ret = this->sized_finalize<64>(off, pool, plocal_symcount);
2600 // Now that we have the final symbol table, we can reliably note
2601 // which symbols should get warnings.
2602 this->warnings_.note_warnings(this);
2607 // SYM is going into the symbol table at *PINDEX. Add the name to
2608 // POOL, update *PINDEX and *POFF.
2612 Symbol_table::add_to_final_symtab(Symbol* sym, Stringpool* pool,
2613 unsigned int* pindex, off_t* poff)
2615 sym->set_symtab_index(*pindex);
2616 if (sym->version() == NULL || !parameters->options().relocatable())
2617 pool->add(sym->name(), false, NULL);
2619 pool->add(sym->versioned_name(), true, NULL);
2621 *poff += elfcpp::Elf_sizes<size>::sym_size;
2624 // Set the final value for all the symbols. This is called after
2625 // Layout::finalize, so all the output sections have their final
2630 Symbol_table::sized_finalize(off_t off, Stringpool* pool,
2631 unsigned int* plocal_symcount)
2633 off = align_address(off, size >> 3);
2634 this->offset_ = off;
2636 unsigned int index = *plocal_symcount;
2637 const unsigned int orig_index = index;
2639 // First do all the symbols which have been forced to be local, as
2640 // they must appear before all global symbols.
2641 for (Forced_locals::iterator p = this->forced_locals_.begin();
2642 p != this->forced_locals_.end();
2646 gold_assert(sym->is_forced_local());
2647 if (this->sized_finalize_symbol<size>(sym))
2649 this->add_to_final_symtab<size>(sym, pool, &index, &off);
2654 // Now do all the remaining symbols.
2655 for (Symbol_table_type::iterator p = this->table_.begin();
2656 p != this->table_.end();
2659 Symbol* sym = p->second;
2660 if (this->sized_finalize_symbol<size>(sym))
2661 this->add_to_final_symtab<size>(sym, pool, &index, &off);
2664 // Now do target-specific symbols.
2665 for (std::vector<Symbol*>::iterator p = this->target_symbols_.begin();
2666 p != this->target_symbols_.end();
2669 this->add_to_final_symtab<size>(*p, pool, &index, &off);
2672 this->output_count_ = index - orig_index;
2677 // Compute the final value of SYM and store status in location PSTATUS.
2678 // During relaxation, this may be called multiple times for a symbol to
2679 // compute its would-be final value in each relaxation pass.
2682 typename Sized_symbol<size>::Value_type
2683 Symbol_table::compute_final_value(
2684 const Sized_symbol<size>* sym,
2685 Compute_final_value_status* pstatus) const
2687 typedef typename Sized_symbol<size>::Value_type Value_type;
2690 switch (sym->source())
2692 case Symbol::FROM_OBJECT:
2695 unsigned int shndx = sym->shndx(&is_ordinary);
2698 && shndx != elfcpp::SHN_ABS
2699 && !Symbol::is_common_shndx(shndx))
2701 *pstatus = CFVS_UNSUPPORTED_SYMBOL_SECTION;
2705 Object* symobj = sym->object();
2706 if (symobj->is_dynamic())
2709 shndx = elfcpp::SHN_UNDEF;
2711 else if (symobj->pluginobj() != NULL)
2714 shndx = elfcpp::SHN_UNDEF;
2716 else if (shndx == elfcpp::SHN_UNDEF)
2718 else if (!is_ordinary
2719 && (shndx == elfcpp::SHN_ABS
2720 || Symbol::is_common_shndx(shndx)))
2721 value = sym->value();
2724 Relobj* relobj = static_cast<Relobj*>(symobj);
2725 Output_section* os = relobj->output_section(shndx);
2727 if (this->is_section_folded(relobj, shndx))
2729 gold_assert(os == NULL);
2730 // Get the os of the section it is folded onto.
2731 Section_id folded = this->icf_->get_folded_section(relobj,
2733 gold_assert(folded.first != NULL);
2734 Relobj* folded_obj = reinterpret_cast<Relobj*>(folded.first);
2735 unsigned folded_shndx = folded.second;
2737 os = folded_obj->output_section(folded_shndx);
2738 gold_assert(os != NULL);
2740 // Replace (relobj, shndx) with canonical ICF input section.
2741 shndx = folded_shndx;
2742 relobj = folded_obj;
2745 uint64_t secoff64 = relobj->output_section_offset(shndx);
2748 bool static_or_reloc = (parameters->doing_static_link() ||
2749 parameters->options().relocatable());
2750 gold_assert(static_or_reloc || sym->dynsym_index() == -1U);
2752 *pstatus = CFVS_NO_OUTPUT_SECTION;
2756 if (secoff64 == -1ULL)
2758 // The section needs special handling (e.g., a merge section).
2760 value = os->output_address(relobj, shndx, sym->value());
2765 convert_types<Value_type, uint64_t>(secoff64);
2766 if (sym->type() == elfcpp::STT_TLS)
2767 value = sym->value() + os->tls_offset() + secoff;
2769 value = sym->value() + os->address() + secoff;
2775 case Symbol::IN_OUTPUT_DATA:
2777 Output_data* od = sym->output_data();
2778 value = sym->value();
2779 if (sym->type() != elfcpp::STT_TLS)
2780 value += od->address();
2783 Output_section* os = od->output_section();
2784 gold_assert(os != NULL);
2785 value += os->tls_offset() + (od->address() - os->address());
2787 if (sym->offset_is_from_end())
2788 value += od->data_size();
2792 case Symbol::IN_OUTPUT_SEGMENT:
2794 Output_segment* os = sym->output_segment();
2795 value = sym->value();
2796 if (sym->type() != elfcpp::STT_TLS)
2797 value += os->vaddr();
2798 switch (sym->offset_base())
2800 case Symbol::SEGMENT_START:
2802 case Symbol::SEGMENT_END:
2803 value += os->memsz();
2805 case Symbol::SEGMENT_BSS:
2806 value += os->filesz();
2814 case Symbol::IS_CONSTANT:
2815 value = sym->value();
2818 case Symbol::IS_UNDEFINED:
2830 // Finalize the symbol SYM. This returns true if the symbol should be
2831 // added to the symbol table, false otherwise.
2835 Symbol_table::sized_finalize_symbol(Symbol* unsized_sym)
2837 typedef typename Sized_symbol<size>::Value_type Value_type;
2839 Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym);
2841 // The default version of a symbol may appear twice in the symbol
2842 // table. We only need to finalize it once.
2843 if (sym->has_symtab_index())
2848 gold_assert(!sym->has_symtab_index());
2849 sym->set_symtab_index(-1U);
2850 gold_assert(sym->dynsym_index() == -1U);
2854 // If the symbol is only present on plugin files, the plugin decided we
2856 if (!sym->in_real_elf())
2858 gold_assert(!sym->has_symtab_index());
2859 sym->set_symtab_index(-1U);
2863 // Compute final symbol value.
2864 Compute_final_value_status status;
2865 Value_type value = this->compute_final_value(sym, &status);
2871 case CFVS_UNSUPPORTED_SYMBOL_SECTION:
2874 unsigned int shndx = sym->shndx(&is_ordinary);
2875 gold_error(_("%s: unsupported symbol section 0x%x"),
2876 sym->demangled_name().c_str(), shndx);
2879 case CFVS_NO_OUTPUT_SECTION:
2880 sym->set_symtab_index(-1U);
2886 sym->set_value(value);
2888 if (parameters->options().strip_all()
2889 || !parameters->options().should_retain_symbol(sym->name()))
2891 sym->set_symtab_index(-1U);
2898 // Write out the global symbols.
2901 Symbol_table::write_globals(const Stringpool* sympool,
2902 const Stringpool* dynpool,
2903 Output_symtab_xindex* symtab_xindex,
2904 Output_symtab_xindex* dynsym_xindex,
2905 Output_file* of) const
2907 switch (parameters->size_and_endianness())
2909 #ifdef HAVE_TARGET_32_LITTLE
2910 case Parameters::TARGET_32_LITTLE:
2911 this->sized_write_globals<32, false>(sympool, dynpool, symtab_xindex,
2915 #ifdef HAVE_TARGET_32_BIG
2916 case Parameters::TARGET_32_BIG:
2917 this->sized_write_globals<32, true>(sympool, dynpool, symtab_xindex,
2921 #ifdef HAVE_TARGET_64_LITTLE
2922 case Parameters::TARGET_64_LITTLE:
2923 this->sized_write_globals<64, false>(sympool, dynpool, symtab_xindex,
2927 #ifdef HAVE_TARGET_64_BIG
2928 case Parameters::TARGET_64_BIG:
2929 this->sized_write_globals<64, true>(sympool, dynpool, symtab_xindex,
2938 // Write out the global symbols.
2940 template<int size, bool big_endian>
2942 Symbol_table::sized_write_globals(const Stringpool* sympool,
2943 const Stringpool* dynpool,
2944 Output_symtab_xindex* symtab_xindex,
2945 Output_symtab_xindex* dynsym_xindex,
2946 Output_file* of) const
2948 const Target& target = parameters->target();
2950 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
2952 const unsigned int output_count = this->output_count_;
2953 const section_size_type oview_size = output_count * sym_size;
2954 const unsigned int first_global_index = this->first_global_index_;
2955 unsigned char* psyms;
2956 if (this->offset_ == 0 || output_count == 0)
2959 psyms = of->get_output_view(this->offset_, oview_size);
2961 const unsigned int dynamic_count = this->dynamic_count_;
2962 const section_size_type dynamic_size = dynamic_count * sym_size;
2963 const unsigned int first_dynamic_global_index =
2964 this->first_dynamic_global_index_;
2965 unsigned char* dynamic_view;
2966 if (this->dynamic_offset_ == 0 || dynamic_count == 0)
2967 dynamic_view = NULL;
2969 dynamic_view = of->get_output_view(this->dynamic_offset_, dynamic_size);
2971 for (Symbol_table_type::const_iterator p = this->table_.begin();
2972 p != this->table_.end();
2975 Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second);
2977 // Possibly warn about unresolved symbols in shared libraries.
2978 this->warn_about_undefined_dynobj_symbol(sym);
2980 unsigned int sym_index = sym->symtab_index();
2981 unsigned int dynsym_index;
2982 if (dynamic_view == NULL)
2985 dynsym_index = sym->dynsym_index();
2987 if (sym_index == -1U && dynsym_index == -1U)
2989 // This symbol is not included in the output file.
2994 typename elfcpp::Elf_types<size>::Elf_Addr sym_value = sym->value();
2995 typename elfcpp::Elf_types<size>::Elf_Addr dynsym_value = sym_value;
2996 elfcpp::STB binding = sym->binding();
2998 // If --weak-unresolved-symbols is set, change binding of unresolved
2999 // global symbols to STB_WEAK.
3000 if (parameters->options().weak_unresolved_symbols()
3001 && binding == elfcpp::STB_GLOBAL
3002 && sym->is_undefined())
3003 binding = elfcpp::STB_WEAK;
3005 // If --no-gnu-unique is set, change STB_GNU_UNIQUE to STB_GLOBAL.
3006 if (binding == elfcpp::STB_GNU_UNIQUE
3007 && !parameters->options().gnu_unique())
3008 binding = elfcpp::STB_GLOBAL;
3010 switch (sym->source())
3012 case Symbol::FROM_OBJECT:
3015 unsigned int in_shndx = sym->shndx(&is_ordinary);
3018 && in_shndx != elfcpp::SHN_ABS
3019 && !Symbol::is_common_shndx(in_shndx))
3021 gold_error(_("%s: unsupported symbol section 0x%x"),
3022 sym->demangled_name().c_str(), in_shndx);
3027 Object* symobj = sym->object();
3028 if (symobj->is_dynamic())
3030 if (sym->needs_dynsym_value())
3031 dynsym_value = target.dynsym_value(sym);
3032 shndx = elfcpp::SHN_UNDEF;
3033 if (sym->is_undef_binding_weak())
3034 binding = elfcpp::STB_WEAK;
3036 binding = elfcpp::STB_GLOBAL;
3038 else if (symobj->pluginobj() != NULL)
3039 shndx = elfcpp::SHN_UNDEF;
3040 else if (in_shndx == elfcpp::SHN_UNDEF
3042 && (in_shndx == elfcpp::SHN_ABS
3043 || Symbol::is_common_shndx(in_shndx))))
3047 Relobj* relobj = static_cast<Relobj*>(symobj);
3048 Output_section* os = relobj->output_section(in_shndx);
3049 if (this->is_section_folded(relobj, in_shndx))
3051 // This global symbol must be written out even though
3053 // Get the os of the section it is folded onto.
3055 this->icf_->get_folded_section(relobj, in_shndx);
3056 gold_assert(folded.first !=NULL);
3057 Relobj* folded_obj =
3058 reinterpret_cast<Relobj*>(folded.first);
3059 os = folded_obj->output_section(folded.second);
3060 gold_assert(os != NULL);
3062 gold_assert(os != NULL);
3063 shndx = os->out_shndx();
3065 if (shndx >= elfcpp::SHN_LORESERVE)
3067 if (sym_index != -1U)
3068 symtab_xindex->add(sym_index, shndx);
3069 if (dynsym_index != -1U)
3070 dynsym_xindex->add(dynsym_index, shndx);
3071 shndx = elfcpp::SHN_XINDEX;
3074 // In object files symbol values are section
3076 if (parameters->options().relocatable())
3077 sym_value -= os->address();
3083 case Symbol::IN_OUTPUT_DATA:
3085 Output_data* od = sym->output_data();
3087 shndx = od->out_shndx();
3088 if (shndx >= elfcpp::SHN_LORESERVE)
3090 if (sym_index != -1U)
3091 symtab_xindex->add(sym_index, shndx);
3092 if (dynsym_index != -1U)
3093 dynsym_xindex->add(dynsym_index, shndx);
3094 shndx = elfcpp::SHN_XINDEX;
3097 // In object files symbol values are section
3099 if (parameters->options().relocatable())
3100 sym_value -= od->address();
3104 case Symbol::IN_OUTPUT_SEGMENT:
3105 shndx = elfcpp::SHN_ABS;
3108 case Symbol::IS_CONSTANT:
3109 shndx = elfcpp::SHN_ABS;
3112 case Symbol::IS_UNDEFINED:
3113 shndx = elfcpp::SHN_UNDEF;
3120 if (sym_index != -1U)
3122 sym_index -= first_global_index;
3123 gold_assert(sym_index < output_count);
3124 unsigned char* ps = psyms + (sym_index * sym_size);
3125 this->sized_write_symbol<size, big_endian>(sym, sym_value, shndx,
3126 binding, sympool, ps);
3129 if (dynsym_index != -1U)
3131 dynsym_index -= first_dynamic_global_index;
3132 gold_assert(dynsym_index < dynamic_count);
3133 unsigned char* pd = dynamic_view + (dynsym_index * sym_size);
3134 this->sized_write_symbol<size, big_endian>(sym, dynsym_value, shndx,
3135 binding, dynpool, pd);
3136 // Allow a target to adjust dynamic symbol value.
3137 parameters->target().adjust_dyn_symbol(sym, pd);
3141 // Write the target-specific symbols.
3142 for (std::vector<Symbol*>::const_iterator p = this->target_symbols_.begin();
3143 p != this->target_symbols_.end();
3146 Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(*p);
3148 unsigned int sym_index = sym->symtab_index();
3149 unsigned int dynsym_index;
3150 if (dynamic_view == NULL)
3153 dynsym_index = sym->dynsym_index();
3156 switch (sym->source())
3158 case Symbol::IS_CONSTANT:
3159 shndx = elfcpp::SHN_ABS;
3161 case Symbol::IS_UNDEFINED:
3162 shndx = elfcpp::SHN_UNDEF;
3168 if (sym_index != -1U)
3170 sym_index -= first_global_index;
3171 gold_assert(sym_index < output_count);
3172 unsigned char* ps = psyms + (sym_index * sym_size);
3173 this->sized_write_symbol<size, big_endian>(sym, sym->value(), shndx,
3174 sym->binding(), sympool,
3178 if (dynsym_index != -1U)
3180 dynsym_index -= first_dynamic_global_index;
3181 gold_assert(dynsym_index < dynamic_count);
3182 unsigned char* pd = dynamic_view + (dynsym_index * sym_size);
3183 this->sized_write_symbol<size, big_endian>(sym, sym->value(), shndx,
3184 sym->binding(), dynpool,
3189 of->write_output_view(this->offset_, oview_size, psyms);
3190 if (dynamic_view != NULL)
3191 of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view);
3194 // Write out the symbol SYM, in section SHNDX, to P. POOL is the
3195 // strtab holding the name.
3197 template<int size, bool big_endian>
3199 Symbol_table::sized_write_symbol(
3200 Sized_symbol<size>* sym,
3201 typename elfcpp::Elf_types<size>::Elf_Addr value,
3203 elfcpp::STB binding,
3204 const Stringpool* pool,
3205 unsigned char* p) const
3207 elfcpp::Sym_write<size, big_endian> osym(p);
3208 if (sym->version() == NULL || !parameters->options().relocatable())
3209 osym.put_st_name(pool->get_offset(sym->name()));
3211 osym.put_st_name(pool->get_offset(sym->versioned_name()));
3212 osym.put_st_value(value);
3213 // Use a symbol size of zero for undefined symbols from shared libraries.
3214 if (shndx == elfcpp::SHN_UNDEF && sym->is_from_dynobj())
3215 osym.put_st_size(0);
3217 osym.put_st_size(sym->symsize());
3218 elfcpp::STT type = sym->type();
3219 gold_assert(type != elfcpp::STT_GNU_IFUNC || !sym->is_from_dynobj());
3220 // A version script may have overridden the default binding.
3221 if (sym->is_forced_local())
3222 osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, type));
3224 osym.put_st_info(elfcpp::elf_st_info(binding, type));
3225 osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis()));
3226 osym.put_st_shndx(shndx);
3229 // Check for unresolved symbols in shared libraries. This is
3230 // controlled by the --allow-shlib-undefined option.
3232 // We only warn about libraries for which we have seen all the
3233 // DT_NEEDED entries. We don't try to track down DT_NEEDED entries
3234 // which were not seen in this link. If we didn't see a DT_NEEDED
3235 // entry, we aren't going to be able to reliably report whether the
3236 // symbol is undefined.
3238 // We also don't warn about libraries found in a system library
3239 // directory (e.g., /lib or /usr/lib); we assume that those libraries
3240 // are OK. This heuristic avoids problems on GNU/Linux, in which -ldl
3241 // can have undefined references satisfied by ld-linux.so.
3244 Symbol_table::warn_about_undefined_dynobj_symbol(Symbol* sym) const
3247 if (sym->source() == Symbol::FROM_OBJECT
3248 && sym->object()->is_dynamic()
3249 && sym->shndx(&dummy) == elfcpp::SHN_UNDEF
3250 && sym->binding() != elfcpp::STB_WEAK
3251 && !parameters->options().allow_shlib_undefined()
3252 && !parameters->target().is_defined_by_abi(sym)
3253 && !sym->object()->is_in_system_directory())
3255 // A very ugly cast.
3256 Dynobj* dynobj = static_cast<Dynobj*>(sym->object());
3257 if (!dynobj->has_unknown_needed_entries())
3258 gold_undefined_symbol(sym);
3262 // Write out a section symbol. Return the update offset.
3265 Symbol_table::write_section_symbol(const Output_section* os,
3266 Output_symtab_xindex* symtab_xindex,
3270 switch (parameters->size_and_endianness())
3272 #ifdef HAVE_TARGET_32_LITTLE
3273 case Parameters::TARGET_32_LITTLE:
3274 this->sized_write_section_symbol<32, false>(os, symtab_xindex, of,
3278 #ifdef HAVE_TARGET_32_BIG
3279 case Parameters::TARGET_32_BIG:
3280 this->sized_write_section_symbol<32, true>(os, symtab_xindex, of,
3284 #ifdef HAVE_TARGET_64_LITTLE
3285 case Parameters::TARGET_64_LITTLE:
3286 this->sized_write_section_symbol<64, false>(os, symtab_xindex, of,
3290 #ifdef HAVE_TARGET_64_BIG
3291 case Parameters::TARGET_64_BIG:
3292 this->sized_write_section_symbol<64, true>(os, symtab_xindex, of,
3301 // Write out a section symbol, specialized for size and endianness.
3303 template<int size, bool big_endian>
3305 Symbol_table::sized_write_section_symbol(const Output_section* os,
3306 Output_symtab_xindex* symtab_xindex,
3310 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
3312 unsigned char* pov = of->get_output_view(offset, sym_size);
3314 elfcpp::Sym_write<size, big_endian> osym(pov);
3315 osym.put_st_name(0);
3316 if (parameters->options().relocatable())
3317 osym.put_st_value(0);
3319 osym.put_st_value(os->address());
3320 osym.put_st_size(0);
3321 osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL,
3322 elfcpp::STT_SECTION));
3323 osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0));
3325 unsigned int shndx = os->out_shndx();
3326 if (shndx >= elfcpp::SHN_LORESERVE)
3328 symtab_xindex->add(os->symtab_index(), shndx);
3329 shndx = elfcpp::SHN_XINDEX;
3331 osym.put_st_shndx(shndx);
3333 of->write_output_view(offset, sym_size, pov);
3336 // Print statistical information to stderr. This is used for --stats.
3339 Symbol_table::print_stats() const
3341 #if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP)
3342 fprintf(stderr, _("%s: symbol table entries: %zu; buckets: %zu\n"),
3343 program_name, this->table_.size(), this->table_.bucket_count());
3345 fprintf(stderr, _("%s: symbol table entries: %zu\n"),
3346 program_name, this->table_.size());
3348 this->namepool_.print_stats("symbol table stringpool");
3351 // We check for ODR violations by looking for symbols with the same
3352 // name for which the debugging information reports that they were
3353 // defined in disjoint source locations. When comparing the source
3354 // location, we consider instances with the same base filename to be
3355 // the same. This is because different object files/shared libraries
3356 // can include the same header file using different paths, and
3357 // different optimization settings can make the line number appear to
3358 // be a couple lines off, and we don't want to report an ODR violation
3361 // This struct is used to compare line information, as returned by
3362 // Dwarf_line_info::one_addr2line. It implements a < comparison
3363 // operator used with std::sort.
3365 struct Odr_violation_compare
3368 operator()(const std::string& s1, const std::string& s2) const
3370 // Inputs should be of the form "dirname/filename:linenum" where
3371 // "dirname/" is optional. We want to compare just the filename:linenum.
3373 // Find the last '/' in each string.
3374 std::string::size_type s1begin = s1.rfind('/');
3375 std::string::size_type s2begin = s2.rfind('/');
3376 // If there was no '/' in a string, start at the beginning.
3377 if (s1begin == std::string::npos)
3379 if (s2begin == std::string::npos)
3381 return s1.compare(s1begin, std::string::npos,
3382 s2, s2begin, std::string::npos) < 0;
3386 // Returns all of the lines attached to LOC, not just the one the
3387 // instruction actually came from.
3388 std::vector<std::string>
3389 Symbol_table::linenos_from_loc(const Task* task,
3390 const Symbol_location& loc)
3392 // We need to lock the object in order to read it. This
3393 // means that we have to run in a singleton Task. If we
3394 // want to run this in a general Task for better
3395 // performance, we will need one Task for object, plus
3396 // appropriate locking to ensure that we don't conflict with
3397 // other uses of the object. Also note, one_addr2line is not
3398 // currently thread-safe.
3399 Task_lock_obj<Object> tl(task, loc.object);
3401 std::vector<std::string> result;
3402 Symbol_location code_loc = loc;
3403 parameters->target().function_location(&code_loc);
3404 // 16 is the size of the object-cache that one_addr2line should use.
3405 std::string canonical_result = Dwarf_line_info::one_addr2line(
3406 code_loc.object, code_loc.shndx, code_loc.offset, 16, &result);
3407 if (!canonical_result.empty())
3408 result.push_back(canonical_result);
3412 // OutputIterator that records if it was ever assigned to. This
3413 // allows it to be used with std::set_intersection() to check for
3414 // intersection rather than computing the intersection.
3415 struct Check_intersection
3417 Check_intersection()
3421 bool had_intersection() const
3422 { return this->value_; }
3424 Check_intersection& operator++()
3427 Check_intersection& operator*()
3430 template<typename T>
3431 Check_intersection& operator=(const T&)
3433 this->value_ = true;
3441 // Check candidate_odr_violations_ to find symbols with the same name
3442 // but apparently different definitions (different source-file/line-no
3443 // for each line assigned to the first instruction).
3446 Symbol_table::detect_odr_violations(const Task* task,
3447 const char* output_file_name) const
3449 for (Odr_map::const_iterator it = candidate_odr_violations_.begin();
3450 it != candidate_odr_violations_.end();
3453 const char* const symbol_name = it->first;
3455 std::string first_object_name;
3456 std::vector<std::string> first_object_linenos;
3458 Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator
3459 locs = it->second.begin();
3460 const Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator
3461 locs_end = it->second.end();
3462 for (; locs != locs_end && first_object_linenos.empty(); ++locs)
3464 // Save the line numbers from the first definition to
3465 // compare to the other definitions. Ideally, we'd compare
3466 // every definition to every other, but we don't want to
3467 // take O(N^2) time to do this. This shortcut may cause
3468 // false negatives that appear or disappear depending on the
3469 // link order, but it won't cause false positives.
3470 first_object_name = locs->object->name();
3471 first_object_linenos = this->linenos_from_loc(task, *locs);
3473 if (first_object_linenos.empty())
3476 // Sort by Odr_violation_compare to make std::set_intersection work.
3477 std::string first_object_canonical_result = first_object_linenos.back();
3478 std::sort(first_object_linenos.begin(), first_object_linenos.end(),
3479 Odr_violation_compare());
3481 for (; locs != locs_end; ++locs)
3483 std::vector<std::string> linenos =
3484 this->linenos_from_loc(task, *locs);
3485 // linenos will be empty if we couldn't parse the debug info.
3486 if (linenos.empty())
3488 // Sort by Odr_violation_compare to make std::set_intersection work.
3489 gold_assert(!linenos.empty());
3490 std::string second_object_canonical_result = linenos.back();
3491 std::sort(linenos.begin(), linenos.end(), Odr_violation_compare());
3493 Check_intersection intersection_result =
3494 std::set_intersection(first_object_linenos.begin(),
3495 first_object_linenos.end(),
3498 Check_intersection(),
3499 Odr_violation_compare());
3500 if (!intersection_result.had_intersection())
3502 gold_warning(_("while linking %s: symbol '%s' defined in "
3503 "multiple places (possible ODR violation):"),
3504 output_file_name, demangle(symbol_name).c_str());
3505 // This only prints one location from each definition,
3506 // which may not be the location we expect to intersect
3507 // with another definition. We could print the whole
3508 // set of locations, but that seems too verbose.
3509 fprintf(stderr, _(" %s from %s\n"),
3510 first_object_canonical_result.c_str(),
3511 first_object_name.c_str());
3512 fprintf(stderr, _(" %s from %s\n"),
3513 second_object_canonical_result.c_str(),
3514 locs->object->name().c_str());
3515 // Only print one broken pair, to avoid needing to
3516 // compare against a list of the disjoint definition
3517 // locations we've found so far. (If we kept comparing
3518 // against just the first one, we'd get a lot of
3519 // redundant complaints about the second definition
3525 // We only call one_addr2line() in this function, so we can clear its cache.
3526 Dwarf_line_info::clear_addr2line_cache();
3529 // Warnings functions.
3531 // Add a new warning.
3534 Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj,
3535 const std::string& warning)
3537 name = symtab->canonicalize_name(name);
3538 this->warnings_[name].set(obj, warning);
3541 // Look through the warnings and mark the symbols for which we should
3542 // warn. This is called during Layout::finalize when we know the
3543 // sources for all the symbols.
3546 Warnings::note_warnings(Symbol_table* symtab)
3548 for (Warning_table::iterator p = this->warnings_.begin();
3549 p != this->warnings_.end();
3552 Symbol* sym = symtab->lookup(p->first, NULL);
3554 && sym->source() == Symbol::FROM_OBJECT
3555 && sym->object() == p->second.object)
3556 sym->set_has_warning();
3560 // Issue a warning. This is called when we see a relocation against a
3561 // symbol for which has a warning.
3563 template<int size, bool big_endian>
3565 Warnings::issue_warning(const Symbol* sym,
3566 const Relocate_info<size, big_endian>* relinfo,
3567 size_t relnum, off_t reloffset) const
3569 gold_assert(sym->has_warning());
3571 // We don't want to issue a warning for a relocation against the
3572 // symbol in the same object file in which the symbol is defined.
3573 if (sym->object() == relinfo->object)
3576 Warning_table::const_iterator p = this->warnings_.find(sym->name());
3577 gold_assert(p != this->warnings_.end());
3578 gold_warning_at_location(relinfo, relnum, reloffset,
3579 "%s", p->second.text.c_str());
3582 // Instantiate the templates we need. We could use the configure
3583 // script to restrict this to only the ones needed for implemented
3586 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3589 Sized_symbol<32>::allocate_common(Output_data*, Value_type);
3592 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3595 Sized_symbol<64>::allocate_common(Output_data*, Value_type);
3598 #ifdef HAVE_TARGET_32_LITTLE
3601 Symbol_table::add_from_relobj<32, false>(
3602 Sized_relobj_file<32, false>* relobj,
3603 const unsigned char* syms,
3605 size_t symndx_offset,
3606 const char* sym_names,
3607 size_t sym_name_size,
3608 Sized_relobj_file<32, false>::Symbols* sympointers,
3612 #ifdef HAVE_TARGET_32_BIG
3615 Symbol_table::add_from_relobj<32, true>(
3616 Sized_relobj_file<32, true>* relobj,
3617 const unsigned char* syms,
3619 size_t symndx_offset,
3620 const char* sym_names,
3621 size_t sym_name_size,
3622 Sized_relobj_file<32, true>::Symbols* sympointers,
3626 #ifdef HAVE_TARGET_64_LITTLE
3629 Symbol_table::add_from_relobj<64, false>(
3630 Sized_relobj_file<64, false>* relobj,
3631 const unsigned char* syms,
3633 size_t symndx_offset,
3634 const char* sym_names,
3635 size_t sym_name_size,
3636 Sized_relobj_file<64, false>::Symbols* sympointers,
3640 #ifdef HAVE_TARGET_64_BIG
3643 Symbol_table::add_from_relobj<64, true>(
3644 Sized_relobj_file<64, true>* relobj,
3645 const unsigned char* syms,
3647 size_t symndx_offset,
3648 const char* sym_names,
3649 size_t sym_name_size,
3650 Sized_relobj_file<64, true>::Symbols* sympointers,
3654 #ifdef HAVE_TARGET_32_LITTLE
3657 Symbol_table::add_from_pluginobj<32, false>(
3658 Sized_pluginobj<32, false>* obj,
3661 elfcpp::Sym<32, false>* sym);
3664 #ifdef HAVE_TARGET_32_BIG
3667 Symbol_table::add_from_pluginobj<32, true>(
3668 Sized_pluginobj<32, true>* obj,
3671 elfcpp::Sym<32, true>* sym);
3674 #ifdef HAVE_TARGET_64_LITTLE
3677 Symbol_table::add_from_pluginobj<64, false>(
3678 Sized_pluginobj<64, false>* obj,
3681 elfcpp::Sym<64, false>* sym);
3684 #ifdef HAVE_TARGET_64_BIG
3687 Symbol_table::add_from_pluginobj<64, true>(
3688 Sized_pluginobj<64, true>* obj,
3691 elfcpp::Sym<64, true>* sym);
3694 #ifdef HAVE_TARGET_32_LITTLE
3697 Symbol_table::add_from_dynobj<32, false>(
3698 Sized_dynobj<32, false>* dynobj,
3699 const unsigned char* syms,
3701 const char* sym_names,
3702 size_t sym_name_size,
3703 const unsigned char* versym,
3705 const std::vector<const char*>* version_map,
3706 Sized_relobj_file<32, false>::Symbols* sympointers,
3710 #ifdef HAVE_TARGET_32_BIG
3713 Symbol_table::add_from_dynobj<32, true>(
3714 Sized_dynobj<32, true>* dynobj,
3715 const unsigned char* syms,
3717 const char* sym_names,
3718 size_t sym_name_size,
3719 const unsigned char* versym,
3721 const std::vector<const char*>* version_map,
3722 Sized_relobj_file<32, true>::Symbols* sympointers,
3726 #ifdef HAVE_TARGET_64_LITTLE
3729 Symbol_table::add_from_dynobj<64, false>(
3730 Sized_dynobj<64, false>* dynobj,
3731 const unsigned char* syms,
3733 const char* sym_names,
3734 size_t sym_name_size,
3735 const unsigned char* versym,
3737 const std::vector<const char*>* version_map,
3738 Sized_relobj_file<64, false>::Symbols* sympointers,
3742 #ifdef HAVE_TARGET_64_BIG
3745 Symbol_table::add_from_dynobj<64, true>(
3746 Sized_dynobj<64, true>* dynobj,
3747 const unsigned char* syms,
3749 const char* sym_names,
3750 size_t sym_name_size,
3751 const unsigned char* versym,
3753 const std::vector<const char*>* version_map,
3754 Sized_relobj_file<64, true>::Symbols* sympointers,
3758 #ifdef HAVE_TARGET_32_LITTLE
3761 Symbol_table::add_from_incrobj(
3765 elfcpp::Sym<32, false>* sym);
3768 #ifdef HAVE_TARGET_32_BIG
3771 Symbol_table::add_from_incrobj(
3775 elfcpp::Sym<32, true>* sym);
3778 #ifdef HAVE_TARGET_64_LITTLE
3781 Symbol_table::add_from_incrobj(
3785 elfcpp::Sym<64, false>* sym);
3788 #ifdef HAVE_TARGET_64_BIG
3791 Symbol_table::add_from_incrobj(
3795 elfcpp::Sym<64, true>* sym);
3798 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3801 Symbol_table::define_with_copy_reloc<32>(
3802 Sized_symbol<32>* sym,
3804 elfcpp::Elf_types<32>::Elf_Addr value);
3807 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3810 Symbol_table::define_with_copy_reloc<64>(
3811 Sized_symbol<64>* sym,
3813 elfcpp::Elf_types<64>::Elf_Addr value);
3816 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3819 Sized_symbol<32>::init_output_data(const char* name, const char* version,
3820 Output_data* od, Value_type value,
3821 Size_type symsize, elfcpp::STT type,
3822 elfcpp::STB binding,
3823 elfcpp::STV visibility,
3824 unsigned char nonvis,
3825 bool offset_is_from_end,
3826 bool is_predefined);
3830 Sized_symbol<32>::init_constant(const char* name, const char* version,
3831 Value_type value, Size_type symsize,
3832 elfcpp::STT type, elfcpp::STB binding,
3833 elfcpp::STV visibility, unsigned char nonvis,
3834 bool is_predefined);
3838 Sized_symbol<32>::init_undefined(const char* name, const char* version,
3839 Value_type value, elfcpp::STT type,
3840 elfcpp::STB binding, elfcpp::STV visibility,
3841 unsigned char nonvis);
3844 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3847 Sized_symbol<64>::init_output_data(const char* name, const char* version,
3848 Output_data* od, Value_type value,
3849 Size_type symsize, elfcpp::STT type,
3850 elfcpp::STB binding,
3851 elfcpp::STV visibility,
3852 unsigned char nonvis,
3853 bool offset_is_from_end,
3854 bool is_predefined);
3858 Sized_symbol<64>::init_constant(const char* name, const char* version,
3859 Value_type value, Size_type symsize,
3860 elfcpp::STT type, elfcpp::STB binding,
3861 elfcpp::STV visibility, unsigned char nonvis,
3862 bool is_predefined);
3866 Sized_symbol<64>::init_undefined(const char* name, const char* version,
3867 Value_type value, elfcpp::STT type,
3868 elfcpp::STB binding, elfcpp::STV visibility,
3869 unsigned char nonvis);
3872 #ifdef HAVE_TARGET_32_LITTLE
3875 Warnings::issue_warning<32, false>(const Symbol* sym,
3876 const Relocate_info<32, false>* relinfo,
3877 size_t relnum, off_t reloffset) const;
3880 #ifdef HAVE_TARGET_32_BIG
3883 Warnings::issue_warning<32, true>(const Symbol* sym,
3884 const Relocate_info<32, true>* relinfo,
3885 size_t relnum, off_t reloffset) const;
3888 #ifdef HAVE_TARGET_64_LITTLE
3891 Warnings::issue_warning<64, false>(const Symbol* sym,
3892 const Relocate_info<64, false>* relinfo,
3893 size_t relnum, off_t reloffset) const;
3896 #ifdef HAVE_TARGET_64_BIG
3899 Warnings::issue_warning<64, true>(const Symbol* sym,
3900 const Relocate_info<64, true>* relinfo,
3901 size_t relnum, off_t reloffset) const;
3904 } // End namespace gold.