1 // symtab.cc -- the gold symbol table
13 #include "workqueue.h"
21 // Initialize fields in Symbol. This initializes everything except u_
25 Symbol::init_fields(const char* name, const char* version,
26 elfcpp::STT type, elfcpp::STB binding,
27 elfcpp::STV visibility, unsigned char nonvis)
30 this->version_ = version;
31 this->symtab_index_ = 0;
32 this->dynsym_index_ = 0;
33 this->got_offset_ = 0;
35 this->binding_ = binding;
36 this->visibility_ = visibility;
37 this->nonvis_ = nonvis;
38 this->is_target_special_ = false;
39 this->is_def_ = false;
40 this->is_forwarder_ = false;
41 this->needs_dynsym_entry_ = false;
42 this->in_dyn_ = false;
43 this->has_got_offset_ = false;
44 this->has_warning_ = false;
47 // Initialize the fields in the base class Symbol for SYM in OBJECT.
49 template<int size, bool big_endian>
51 Symbol::init_base(const char* name, const char* version, Object* object,
52 const elfcpp::Sym<size, big_endian>& sym)
54 this->init_fields(name, version, sym.get_st_type(), sym.get_st_bind(),
55 sym.get_st_visibility(), sym.get_st_nonvis());
56 this->u_.from_object.object = object;
57 // FIXME: Handle SHN_XINDEX.
58 this->u_.from_object.shnum = sym.get_st_shndx();
59 this->source_ = FROM_OBJECT;
60 this->in_dyn_ = object->is_dynamic();
63 // Initialize the fields in the base class Symbol for a symbol defined
67 Symbol::init_base(const char* name, Output_data* od, elfcpp::STT type,
68 elfcpp::STB binding, elfcpp::STV visibility,
69 unsigned char nonvis, bool offset_is_from_end)
71 this->init_fields(name, NULL, type, binding, visibility, nonvis);
72 this->u_.in_output_data.output_data = od;
73 this->u_.in_output_data.offset_is_from_end = offset_is_from_end;
74 this->source_ = IN_OUTPUT_DATA;
77 // Initialize the fields in the base class Symbol for a symbol defined
78 // in an Output_segment.
81 Symbol::init_base(const char* name, Output_segment* os, elfcpp::STT type,
82 elfcpp::STB binding, elfcpp::STV visibility,
83 unsigned char nonvis, Segment_offset_base offset_base)
85 this->init_fields(name, NULL, type, binding, visibility, nonvis);
86 this->u_.in_output_segment.output_segment = os;
87 this->u_.in_output_segment.offset_base = offset_base;
88 this->source_ = IN_OUTPUT_SEGMENT;
91 // Initialize the fields in the base class Symbol for a symbol defined
95 Symbol::init_base(const char* name, elfcpp::STT type,
96 elfcpp::STB binding, elfcpp::STV visibility,
99 this->init_fields(name, NULL, type, binding, visibility, nonvis);
100 this->source_ = CONSTANT;
103 // Initialize the fields in Sized_symbol for SYM in OBJECT.
106 template<bool big_endian>
108 Sized_symbol<size>::init(const char* name, const char* version, Object* object,
109 const elfcpp::Sym<size, big_endian>& sym)
111 this->init_base(name, version, object, sym);
112 this->value_ = sym.get_st_value();
113 this->symsize_ = sym.get_st_size();
116 // Initialize the fields in Sized_symbol for a symbol defined in an
121 Sized_symbol<size>::init(const char* name, Output_data* od,
122 Value_type value, Size_type symsize,
123 elfcpp::STT type, elfcpp::STB binding,
124 elfcpp::STV visibility, unsigned char nonvis,
125 bool offset_is_from_end)
127 this->init_base(name, od, type, binding, visibility, nonvis,
129 this->value_ = value;
130 this->symsize_ = symsize;
133 // Initialize the fields in Sized_symbol for a symbol defined in an
138 Sized_symbol<size>::init(const char* name, Output_segment* os,
139 Value_type value, Size_type symsize,
140 elfcpp::STT type, elfcpp::STB binding,
141 elfcpp::STV visibility, unsigned char nonvis,
142 Segment_offset_base offset_base)
144 this->init_base(name, os, type, binding, visibility, nonvis, offset_base);
145 this->value_ = value;
146 this->symsize_ = symsize;
149 // Initialize the fields in Sized_symbol for a symbol defined as a
154 Sized_symbol<size>::init(const char* name, Value_type value, Size_type symsize,
155 elfcpp::STT type, elfcpp::STB binding,
156 elfcpp::STV visibility, unsigned char nonvis)
158 this->init_base(name, type, binding, visibility, nonvis);
159 this->value_ = value;
160 this->symsize_ = symsize;
163 // Class Symbol_table.
165 Symbol_table::Symbol_table()
166 : size_(0), saw_undefined_(0), offset_(0), table_(), namepool_(),
167 forwarders_(), commons_(), warnings_()
171 Symbol_table::~Symbol_table()
175 // The hash function. The key is always canonicalized, so we use a
176 // simple combination of the pointers.
179 Symbol_table::Symbol_table_hash::operator()(const Symbol_table_key& key) const
181 return key.first ^ key.second;
184 // The symbol table key equality function. This is only called with
185 // canonicalized name and version strings, so we can use pointer
189 Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1,
190 const Symbol_table_key& k2) const
192 return k1.first == k2.first && k1.second == k2.second;
195 // Make TO a symbol which forwards to FROM.
198 Symbol_table::make_forwarder(Symbol* from, Symbol* to)
200 gold_assert(from != to);
201 gold_assert(!from->is_forwarder() && !to->is_forwarder());
202 this->forwarders_[from] = to;
203 from->set_forwarder();
206 // Resolve the forwards from FROM, returning the real symbol.
209 Symbol_table::resolve_forwards(const Symbol* from) const
211 gold_assert(from->is_forwarder());
212 Unordered_map<const Symbol*, Symbol*>::const_iterator p =
213 this->forwarders_.find(from);
214 gold_assert(p != this->forwarders_.end());
218 // Look up a symbol by name.
221 Symbol_table::lookup(const char* name, const char* version) const
223 Stringpool::Key name_key;
224 name = this->namepool_.find(name, &name_key);
228 Stringpool::Key version_key = 0;
231 version = this->namepool_.find(version, &version_key);
236 Symbol_table_key key(name_key, version_key);
237 Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key);
238 if (p == this->table_.end())
243 // Resolve a Symbol with another Symbol. This is only used in the
244 // unusual case where there are references to both an unversioned
245 // symbol and a symbol with a version, and we then discover that that
246 // version is the default version. Because this is unusual, we do
247 // this the slow way, by converting back to an ELF symbol.
249 template<int size, bool big_endian>
251 Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from
254 unsigned char buf[elfcpp::Elf_sizes<size>::sym_size];
255 elfcpp::Sym_write<size, big_endian> esym(buf);
256 // We don't bother to set the st_name field.
257 esym.put_st_value(from->value());
258 esym.put_st_size(from->symsize());
259 esym.put_st_info(from->binding(), from->type());
260 esym.put_st_other(from->visibility(), from->nonvis());
261 esym.put_st_shndx(from->shnum());
262 Symbol_table::resolve(to, esym.sym(), from->object());
265 // Add one symbol from OBJECT to the symbol table. NAME is symbol
266 // name and VERSION is the version; both are canonicalized. DEF is
267 // whether this is the default version.
269 // If DEF is true, then this is the definition of a default version of
270 // a symbol. That means that any lookup of NAME/NULL and any lookup
271 // of NAME/VERSION should always return the same symbol. This is
272 // obvious for references, but in particular we want to do this for
273 // definitions: overriding NAME/NULL should also override
274 // NAME/VERSION. If we don't do that, it would be very hard to
275 // override functions in a shared library which uses versioning.
277 // We implement this by simply making both entries in the hash table
278 // point to the same Symbol structure. That is easy enough if this is
279 // the first time we see NAME/NULL or NAME/VERSION, but it is possible
280 // that we have seen both already, in which case they will both have
281 // independent entries in the symbol table. We can't simply change
282 // the symbol table entry, because we have pointers to the entries
283 // attached to the object files. So we mark the entry attached to the
284 // object file as a forwarder, and record it in the forwarders_ map.
285 // Note that entries in the hash table will never be marked as
288 template<int size, bool big_endian>
290 Symbol_table::add_from_object(Object* object,
292 Stringpool::Key name_key,
294 Stringpool::Key version_key,
296 const elfcpp::Sym<size, big_endian>& sym)
298 Symbol* const snull = NULL;
299 std::pair<typename Symbol_table_type::iterator, bool> ins =
300 this->table_.insert(std::make_pair(std::make_pair(name_key, version_key),
303 std::pair<typename Symbol_table_type::iterator, bool> insdef =
304 std::make_pair(this->table_.end(), false);
307 const Stringpool::Key vnull_key = 0;
308 insdef = this->table_.insert(std::make_pair(std::make_pair(name_key,
313 // ins.first: an iterator, which is a pointer to a pair.
314 // ins.first->first: the key (a pair of name and version).
315 // ins.first->second: the value (Symbol*).
316 // ins.second: true if new entry was inserted, false if not.
318 Sized_symbol<size>* ret;
323 // We already have an entry for NAME/VERSION.
324 ret = this->get_sized_symbol SELECT_SIZE_NAME(size) (ins.first->second
326 gold_assert(ret != NULL);
328 was_undefined = ret->is_undefined();
329 was_common = ret->is_common();
331 Symbol_table::resolve(ret, sym, object);
337 // This is the first time we have seen NAME/NULL. Make
338 // NAME/NULL point to NAME/VERSION.
339 insdef.first->second = ret;
341 else if (insdef.first->second != ret)
343 // This is the unfortunate case where we already have
344 // entries for both NAME/VERSION and NAME/NULL.
345 const Sized_symbol<size>* sym2;
346 sym2 = this->get_sized_symbol SELECT_SIZE_NAME(size) (
349 Symbol_table::resolve SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
350 ret, sym2 SELECT_SIZE_ENDIAN(size, big_endian));
351 this->make_forwarder(insdef.first->second, ret);
352 insdef.first->second = ret;
358 // This is the first time we have seen NAME/VERSION.
359 gold_assert(ins.first->second == NULL);
361 was_undefined = false;
364 if (def && !insdef.second)
366 // We already have an entry for NAME/NULL. Make
367 // NAME/VERSION point to it.
368 ret = this->get_sized_symbol SELECT_SIZE_NAME(size) (
371 Symbol_table::resolve(ret, sym, object);
372 ins.first->second = ret;
376 Sized_target<size, big_endian>* target =
377 object->sized_target SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
378 SELECT_SIZE_ENDIAN_ONLY(size, big_endian));
379 if (!target->has_make_symbol())
380 ret = new Sized_symbol<size>();
383 ret = target->make_symbol();
386 // This means that we don't want a symbol table
389 this->table_.erase(ins.first);
392 this->table_.erase(insdef.first);
393 // Inserting insdef invalidated ins.
394 this->table_.erase(std::make_pair(name_key,
401 ret->init(name, version, object, sym);
403 ins.first->second = ret;
406 // This is the first time we have seen NAME/NULL. Point
407 // it at the new entry for NAME/VERSION.
408 gold_assert(insdef.second);
409 insdef.first->second = ret;
414 // Record every time we see a new undefined symbol, to speed up
416 if (!was_undefined && ret->is_undefined())
417 ++this->saw_undefined_;
419 // Keep track of common symbols, to speed up common symbol
421 if (!was_common && ret->is_common())
422 this->commons_.push_back(ret);
427 // Add all the symbols in a relocatable object to the hash table.
429 template<int size, bool big_endian>
431 Symbol_table::add_from_relobj(
432 Sized_relobj<size, big_endian>* relobj,
433 const unsigned char* syms,
435 const char* sym_names,
436 size_t sym_name_size,
437 Symbol** sympointers)
439 // We take the size from the first object we see.
440 if (this->get_size() == 0)
441 this->set_size(size);
443 if (size != this->get_size() || size != relobj->target()->get_size())
445 fprintf(stderr, _("%s: %s: mixing 32-bit and 64-bit ELF objects\n"),
446 program_name, relobj->name().c_str());
450 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
452 const unsigned char* p = syms;
453 for (size_t i = 0; i < count; ++i, p += sym_size)
455 elfcpp::Sym<size, big_endian> sym(p);
456 elfcpp::Sym<size, big_endian>* psym = &sym;
458 unsigned int st_name = psym->get_st_name();
459 if (st_name >= sym_name_size)
462 _("%s: %s: bad global symbol name offset %u at %lu\n"),
463 program_name, relobj->name().c_str(), st_name,
464 static_cast<unsigned long>(i));
468 const char* name = sym_names + st_name;
470 // A symbol defined in a section which we are not including must
471 // be treated as an undefined symbol.
472 unsigned char symbuf[sym_size];
473 elfcpp::Sym<size, big_endian> sym2(symbuf);
474 unsigned int st_shndx = psym->get_st_shndx();
475 if (st_shndx != elfcpp::SHN_UNDEF
476 && st_shndx < elfcpp::SHN_LORESERVE
477 && !relobj->is_section_included(st_shndx))
479 memcpy(symbuf, p, sym_size);
480 elfcpp::Sym_write<size, big_endian> sw(symbuf);
481 sw.put_st_shndx(elfcpp::SHN_UNDEF);
485 // In an object file, an '@' in the name separates the symbol
486 // name from the version name. If there are two '@' characters,
487 // this is the default version.
488 const char* ver = strchr(name, '@');
493 Stringpool::Key name_key;
494 name = this->namepool_.add(name, &name_key);
495 res = this->add_from_object(relobj, name, name_key, NULL, 0,
500 Stringpool::Key name_key;
501 name = this->namepool_.add(name, ver - name, &name_key);
511 Stringpool::Key ver_key;
512 ver = this->namepool_.add(ver, &ver_key);
514 res = this->add_from_object(relobj, name, name_key, ver, ver_key,
518 *sympointers++ = res;
522 // Add all the symbols in a dynamic object to the hash table.
524 template<int size, bool big_endian>
526 Symbol_table::add_from_dynobj(
527 Sized_dynobj<size, big_endian>* dynobj,
528 const unsigned char* syms,
530 const char* sym_names,
531 size_t sym_name_size,
532 const unsigned char* versym,
534 const std::vector<const char*>* version_map)
536 // We take the size from the first object we see.
537 if (this->get_size() == 0)
538 this->set_size(size);
540 if (size != this->get_size() || size != dynobj->target()->get_size())
542 fprintf(stderr, _("%s: %s: mixing 32-bit and 64-bit ELF objects\n"),
543 program_name, dynobj->name().c_str());
547 if (versym != NULL && versym_size / 2 < count)
549 fprintf(stderr, _("%s: %s: too few symbol versions\n"),
550 program_name, dynobj->name().c_str());
554 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
556 const unsigned char* p = syms;
557 const unsigned char* vs = versym;
558 for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2)
560 elfcpp::Sym<size, big_endian> sym(p);
562 // Ignore symbols with local binding.
563 if (sym.get_st_bind() == elfcpp::STB_LOCAL)
566 unsigned int st_name = sym.get_st_name();
567 if (st_name >= sym_name_size)
569 fprintf(stderr, _("%s: %s: bad symbol name offset %u at %lu\n"),
570 program_name, dynobj->name().c_str(), st_name,
571 static_cast<unsigned long>(i));
575 const char* name = sym_names + st_name;
579 Stringpool::Key name_key;
580 name = this->namepool_.add(name, &name_key);
581 this->add_from_object(dynobj, name, name_key, NULL, 0,
586 // Read the version information.
588 unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs);
590 bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0;
591 v &= elfcpp::VERSYM_VERSION;
593 if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL))
595 // This symbol should not be visible outside the object.
599 // At this point we are definitely going to add this symbol.
600 Stringpool::Key name_key;
601 name = this->namepool_.add(name, &name_key);
603 if (v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL))
605 // This symbol does not have a version.
606 this->add_from_object(dynobj, name, name_key, NULL, 0, false, sym);
610 if (v >= version_map->size())
613 _("%s: %s: versym for symbol %zu out of range: %u\n"),
614 program_name, dynobj->name().c_str(), i, v);
618 const char* version = (*version_map)[v];
621 fprintf(stderr, _("%s: %s: versym for symbol %zu has no name: %u\n"),
622 program_name, dynobj->name().c_str(), i, v);
626 Stringpool::Key version_key;
627 version = this->namepool_.add(version, &version_key);
629 // If this is an absolute symbol, and the version name and
630 // symbol name are the same, then this is the version definition
631 // symbol. These symbols exist to support using -u to pull in
632 // particular versions. We do not want to record a version for
634 if (sym.get_st_shndx() == elfcpp::SHN_ABS && name_key == version_key)
636 this->add_from_object(dynobj, name, name_key, NULL, 0, false, sym);
640 const bool def = !hidden && sym.get_st_shndx() != elfcpp::SHN_UNDEF;
642 this->add_from_object(dynobj, name, name_key, version, version_key,
647 // Create and return a specially defined symbol. If ONLY_IF_REF is
648 // true, then only create the symbol if there is a reference to it.
650 template<int size, bool big_endian>
652 Symbol_table::define_special_symbol(Target* target, const char* name,
656 gold_assert(this->size_ == size);
659 Sized_symbol<size>* sym;
663 oldsym = this->lookup(name, NULL);
664 if (oldsym == NULL || !oldsym->is_undefined())
668 // Canonicalize NAME.
669 name = oldsym->name();
673 // Canonicalize NAME.
674 Stringpool::Key name_key;
675 name = this->namepool_.add(name, &name_key);
677 Symbol* const snull = NULL;
678 const Stringpool::Key ver_key = 0;
679 std::pair<typename Symbol_table_type::iterator, bool> ins =
680 this->table_.insert(std::make_pair(std::make_pair(name_key, ver_key),
685 // We already have a symbol table entry for NAME.
686 oldsym = ins.first->second;
687 gold_assert(oldsym != NULL);
692 // We haven't seen this symbol before.
693 gold_assert(ins.first->second == NULL);
695 if (!target->has_make_symbol())
696 sym = new Sized_symbol<size>();
699 gold_assert(target->get_size() == size);
700 gold_assert(target->is_big_endian() ? big_endian : !big_endian);
701 typedef Sized_target<size, big_endian> My_target;
702 My_target* sized_target = static_cast<My_target*>(target);
703 sym = sized_target->make_symbol();
708 ins.first->second = sym;
715 gold_assert(sym == NULL);
717 sym = this->get_sized_symbol SELECT_SIZE_NAME(size) (oldsym
719 gold_assert(sym->source() == Symbol::FROM_OBJECT);
720 const int old_shnum = sym->shnum();
721 if (old_shnum != elfcpp::SHN_UNDEF
722 && old_shnum != elfcpp::SHN_COMMON
723 && !sym->object()->is_dynamic())
725 fprintf(stderr, "%s: linker defined: multiple definition of %s\n",
727 // FIXME: Report old location. Record that we have seen an
732 // Our new definition is going to override the old reference.
738 // Define a symbol based on an Output_data.
741 Symbol_table::define_in_output_data(Target* target, const char* name,
743 uint64_t value, uint64_t symsize,
744 elfcpp::STT type, elfcpp::STB binding,
745 elfcpp::STV visibility,
746 unsigned char nonvis,
747 bool offset_is_from_end,
750 gold_assert(target->get_size() == this->size_);
751 if (this->size_ == 32)
752 this->do_define_in_output_data<32>(target, name, od, value, symsize,
753 type, binding, visibility, nonvis,
754 offset_is_from_end, only_if_ref);
755 else if (this->size_ == 64)
756 this->do_define_in_output_data<64>(target, name, od, value, symsize,
757 type, binding, visibility, nonvis,
758 offset_is_from_end, only_if_ref);
763 // Define a symbol in an Output_data, sized version.
767 Symbol_table::do_define_in_output_data(
771 typename elfcpp::Elf_types<size>::Elf_Addr value,
772 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
775 elfcpp::STV visibility,
776 unsigned char nonvis,
777 bool offset_is_from_end,
780 Sized_symbol<size>* sym;
782 if (target->is_big_endian())
783 sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) (
784 target, name, only_if_ref
785 SELECT_SIZE_ENDIAN(size, true));
787 sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) (
788 target, name, only_if_ref
789 SELECT_SIZE_ENDIAN(size, false));
794 sym->init(name, od, value, symsize, type, binding, visibility, nonvis,
798 // Define a symbol based on an Output_segment.
801 Symbol_table::define_in_output_segment(Target* target, const char* name,
803 uint64_t value, uint64_t symsize,
804 elfcpp::STT type, elfcpp::STB binding,
805 elfcpp::STV visibility,
806 unsigned char nonvis,
807 Symbol::Segment_offset_base offset_base,
810 gold_assert(target->get_size() == this->size_);
811 if (this->size_ == 32)
812 this->do_define_in_output_segment<32>(target, name, os, value, symsize,
813 type, binding, visibility, nonvis,
814 offset_base, only_if_ref);
815 else if (this->size_ == 64)
816 this->do_define_in_output_segment<64>(target, name, os, value, symsize,
817 type, binding, visibility, nonvis,
818 offset_base, only_if_ref);
823 // Define a symbol in an Output_segment, sized version.
827 Symbol_table::do_define_in_output_segment(
831 typename elfcpp::Elf_types<size>::Elf_Addr value,
832 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
835 elfcpp::STV visibility,
836 unsigned char nonvis,
837 Symbol::Segment_offset_base offset_base,
840 Sized_symbol<size>* sym;
842 if (target->is_big_endian())
843 sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) (
844 target, name, only_if_ref
845 SELECT_SIZE_ENDIAN(size, true));
847 sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) (
848 target, name, only_if_ref
849 SELECT_SIZE_ENDIAN(size, false));
854 sym->init(name, os, value, symsize, type, binding, visibility, nonvis,
858 // Define a special symbol with a constant value. It is a multiple
859 // definition error if this symbol is already defined.
862 Symbol_table::define_as_constant(Target* target, const char* name,
863 uint64_t value, uint64_t symsize,
864 elfcpp::STT type, elfcpp::STB binding,
865 elfcpp::STV visibility, unsigned char nonvis,
868 gold_assert(target->get_size() == this->size_);
869 if (this->size_ == 32)
870 this->do_define_as_constant<32>(target, name, value, symsize,
871 type, binding, visibility, nonvis,
873 else if (this->size_ == 64)
874 this->do_define_as_constant<64>(target, name, value, symsize,
875 type, binding, visibility, nonvis,
881 // Define a symbol as a constant, sized version.
885 Symbol_table::do_define_as_constant(
888 typename elfcpp::Elf_types<size>::Elf_Addr value,
889 typename elfcpp::Elf_types<size>::Elf_WXword symsize,
892 elfcpp::STV visibility,
893 unsigned char nonvis,
896 Sized_symbol<size>* sym;
898 if (target->is_big_endian())
899 sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) (
900 target, name, only_if_ref
901 SELECT_SIZE_ENDIAN(size, true));
903 sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) (
904 target, name, only_if_ref
905 SELECT_SIZE_ENDIAN(size, false));
910 sym->init(name, value, symsize, type, binding, visibility, nonvis);
913 // Define a set of symbols in output sections.
916 Symbol_table::define_symbols(const Layout* layout, Target* target, int count,
917 const Define_symbol_in_section* p)
919 for (int i = 0; i < count; ++i, ++p)
921 Output_section* os = layout->find_output_section(p->output_section);
923 this->define_in_output_data(target, p->name, os, p->value, p->size,
924 p->type, p->binding, p->visibility,
925 p->nonvis, p->offset_is_from_end,
928 this->define_as_constant(target, p->name, 0, p->size, p->type,
929 p->binding, p->visibility, p->nonvis,
934 // Define a set of symbols in output segments.
937 Symbol_table::define_symbols(const Layout* layout, Target* target, int count,
938 const Define_symbol_in_segment* p)
940 for (int i = 0; i < count; ++i, ++p)
942 Output_segment* os = layout->find_output_segment(p->segment_type,
943 p->segment_flags_set,
944 p->segment_flags_clear);
946 this->define_in_output_segment(target, p->name, os, p->value, p->size,
947 p->type, p->binding, p->visibility,
948 p->nonvis, p->offset_base,
951 this->define_as_constant(target, p->name, 0, p->size, p->type,
952 p->binding, p->visibility, p->nonvis,
957 // Set the dynamic symbol indexes. INDEX is the index of the first
958 // global dynamic symbol. Pointers to the symbols are stored into the
959 // vector SYMS. The names are added to DYNPOOL. This returns an
960 // updated dynamic symbol index.
963 Symbol_table::set_dynsym_indexes(unsigned int index,
964 std::vector<Symbol*>* syms,
967 for (Symbol_table_type::iterator p = this->table_.begin();
968 p != this->table_.end();
971 Symbol* sym = p->second;
972 if (sym->needs_dynsym_entry())
974 sym->set_dynsym_index(index);
976 syms->push_back(sym);
977 dynpool->add(sym->name(), NULL);
984 // Set the final values for all the symbols. The index of the first
985 // global symbol in the output file is INDEX. Record the file offset
986 // OFF. Add their names to POOL. Return the new file offset.
989 Symbol_table::finalize(unsigned int index, off_t off, Stringpool* pool)
993 gold_assert(index != 0);
994 this->first_global_index_ = index;
996 if (this->size_ == 32)
997 ret = this->sized_finalize<32>(index, off, pool);
998 else if (this->size_ == 64)
999 ret = this->sized_finalize<64>(index, off, pool);
1003 // Now that we have the final symbol table, we can reliably note
1004 // which symbols should get warnings.
1005 this->warnings_.note_warnings(this);
1010 // Set the final value for all the symbols. This is called after
1011 // Layout::finalize, so all the output sections have their final
1016 Symbol_table::sized_finalize(unsigned index, off_t off, Stringpool* pool)
1018 off = align_address(off, size >> 3);
1019 this->offset_ = off;
1021 size_t orig_index = index;
1023 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
1024 for (Symbol_table_type::iterator p = this->table_.begin();
1025 p != this->table_.end();
1028 Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second);
1030 // FIXME: Here we need to decide which symbols should go into
1031 // the output file, based on --strip.
1033 // The default version of a symbol may appear twice in the
1034 // symbol table. We only need to finalize it once.
1035 if (sym->has_symtab_index())
1038 typename Sized_symbol<size>::Value_type value;
1040 switch (sym->source())
1042 case Symbol::FROM_OBJECT:
1044 unsigned int shnum = sym->shnum();
1046 // FIXME: We need some target specific support here.
1047 if (shnum >= elfcpp::SHN_LORESERVE
1048 && shnum != elfcpp::SHN_ABS)
1050 fprintf(stderr, _("%s: %s: unsupported symbol section 0x%x\n"),
1051 program_name, sym->name(), shnum);
1055 Object* symobj = sym->object();
1056 if (symobj->is_dynamic())
1059 shnum = elfcpp::SHN_UNDEF;
1061 else if (shnum == elfcpp::SHN_UNDEF)
1063 else if (shnum == elfcpp::SHN_ABS)
1064 value = sym->value();
1067 Relobj* relobj = static_cast<Relobj*>(symobj);
1069 Output_section* os = relobj->output_section(shnum, &secoff);
1073 sym->set_symtab_index(-1U);
1077 value = sym->value() + os->address() + secoff;
1082 case Symbol::IN_OUTPUT_DATA:
1084 Output_data* od = sym->output_data();
1085 value = sym->value() + od->address();
1086 if (sym->offset_is_from_end())
1087 value += od->data_size();
1091 case Symbol::IN_OUTPUT_SEGMENT:
1093 Output_segment* os = sym->output_segment();
1094 value = sym->value() + os->vaddr();
1095 switch (sym->offset_base())
1097 case Symbol::SEGMENT_START:
1099 case Symbol::SEGMENT_END:
1100 value += os->memsz();
1102 case Symbol::SEGMENT_BSS:
1103 value += os->filesz();
1111 case Symbol::CONSTANT:
1112 value = sym->value();
1119 sym->set_value(value);
1120 sym->set_symtab_index(index);
1121 pool->add(sym->name(), NULL);
1126 this->output_count_ = index - orig_index;
1131 // Write out the global symbols.
1134 Symbol_table::write_globals(const Target* target, const Stringpool* sympool,
1135 Output_file* of) const
1137 if (this->size_ == 32)
1139 if (target->is_big_endian())
1140 this->sized_write_globals<32, true>(target, sympool, of);
1142 this->sized_write_globals<32, false>(target, sympool, of);
1144 else if (this->size_ == 64)
1146 if (target->is_big_endian())
1147 this->sized_write_globals<64, true>(target, sympool, of);
1149 this->sized_write_globals<64, false>(target, sympool, of);
1155 // Write out the global symbols.
1157 template<int size, bool big_endian>
1159 Symbol_table::sized_write_globals(const Target*,
1160 const Stringpool* sympool,
1161 Output_file* of) const
1163 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
1164 unsigned int index = this->first_global_index_;
1165 const off_t oview_size = this->output_count_ * sym_size;
1166 unsigned char* psyms = of->get_output_view(this->offset_, oview_size);
1168 unsigned char* ps = psyms;
1169 for (Symbol_table_type::const_iterator p = this->table_.begin();
1170 p != this->table_.end();
1173 Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second);
1175 unsigned int sym_index = sym->symtab_index();
1176 if (sym_index == -1U)
1178 // This symbol is not included in the output file.
1181 if (sym_index != index)
1183 // We have already seen this symbol, because it has a
1185 gold_assert(sym_index < index);
1191 switch (sym->source())
1193 case Symbol::FROM_OBJECT:
1195 unsigned int shnum = sym->shnum();
1197 // FIXME: We need some target specific support here.
1198 if (shnum >= elfcpp::SHN_LORESERVE
1199 && shnum != elfcpp::SHN_ABS)
1201 fprintf(stderr, _("%s: %s: unsupported symbol section 0x%x\n"),
1202 program_name, sym->name(), sym->shnum());
1206 Object* symobj = sym->object();
1207 if (symobj->is_dynamic())
1210 shndx = elfcpp::SHN_UNDEF;
1212 else if (shnum == elfcpp::SHN_UNDEF || shnum == elfcpp::SHN_ABS)
1216 Relobj* relobj = static_cast<Relobj*>(symobj);
1218 Output_section* os = relobj->output_section(shnum, &secoff);
1219 gold_assert(os != NULL);
1220 shndx = os->out_shndx();
1225 case Symbol::IN_OUTPUT_DATA:
1226 shndx = sym->output_data()->out_shndx();
1229 case Symbol::IN_OUTPUT_SEGMENT:
1230 shndx = elfcpp::SHN_ABS;
1233 case Symbol::CONSTANT:
1234 shndx = elfcpp::SHN_ABS;
1241 elfcpp::Sym_write<size, big_endian> osym(ps);
1242 osym.put_st_name(sympool->get_offset(sym->name()));
1243 osym.put_st_value(sym->value());
1244 osym.put_st_size(sym->symsize());
1245 osym.put_st_info(elfcpp::elf_st_info(sym->binding(), sym->type()));
1246 osym.put_st_other(elfcpp::elf_st_other(sym->visibility(),
1248 osym.put_st_shndx(shndx);
1253 gold_assert(ps - psyms == oview_size);
1255 of->write_output_view(this->offset_, oview_size, psyms);
1258 // Write out a section symbol. Return the update offset.
1261 Symbol_table::write_section_symbol(const Target* target,
1262 const Output_section *os,
1266 if (this->size_ == 32)
1268 if (target->is_big_endian())
1269 this->sized_write_section_symbol<32, true>(os, of, offset);
1271 this->sized_write_section_symbol<32, false>(os, of, offset);
1273 else if (this->size_ == 64)
1275 if (target->is_big_endian())
1276 this->sized_write_section_symbol<64, true>(os, of, offset);
1278 this->sized_write_section_symbol<64, false>(os, of, offset);
1284 // Write out a section symbol, specialized for size and endianness.
1286 template<int size, bool big_endian>
1288 Symbol_table::sized_write_section_symbol(const Output_section* os,
1292 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
1294 unsigned char* pov = of->get_output_view(offset, sym_size);
1296 elfcpp::Sym_write<size, big_endian> osym(pov);
1297 osym.put_st_name(0);
1298 osym.put_st_value(os->address());
1299 osym.put_st_size(0);
1300 osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL,
1301 elfcpp::STT_SECTION));
1302 osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0));
1303 osym.put_st_shndx(os->out_shndx());
1305 of->write_output_view(offset, sym_size, pov);
1308 // Warnings functions.
1310 // Add a new warning.
1313 Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj,
1316 name = symtab->canonicalize_name(name);
1317 this->warnings_[name].set(obj, shndx);
1320 // Look through the warnings and mark the symbols for which we should
1321 // warn. This is called during Layout::finalize when we know the
1322 // sources for all the symbols.
1325 Warnings::note_warnings(Symbol_table* symtab)
1327 for (Warning_table::iterator p = this->warnings_.begin();
1328 p != this->warnings_.end();
1331 Symbol* sym = symtab->lookup(p->first, NULL);
1333 && sym->source() == Symbol::FROM_OBJECT
1334 && sym->object() == p->second.object)
1336 sym->set_has_warning();
1338 // Read the section contents to get the warning text. It
1339 // would be nicer if we only did this if we have to actually
1340 // issue a warning. Unfortunately, warnings are issued as
1341 // we relocate sections. That means that we can not lock
1342 // the object then, as we might try to issue the same
1343 // warning multiple times simultaneously.
1345 Task_locker_obj<Object> tl(*p->second.object);
1346 const unsigned char* c;
1348 c = p->second.object->section_contents(p->second.shndx, &len);
1349 p->second.set_text(reinterpret_cast<const char*>(c), len);
1355 // Issue a warning. This is called when we see a relocation against a
1356 // symbol for which has a warning.
1359 Warnings::issue_warning(const Symbol* sym, const std::string& location) const
1361 gold_assert(sym->has_warning());
1362 Warning_table::const_iterator p = this->warnings_.find(sym->name());
1363 gold_assert(p != this->warnings_.end());
1364 fprintf(stderr, _("%s: %s: warning: %s\n"), program_name, location.c_str(),
1365 p->second.text.c_str());
1368 // Instantiate the templates we need. We could use the configure
1369 // script to restrict this to only the ones needed for implemented
1374 Symbol_table::add_from_relobj<32, true>(
1375 Sized_relobj<32, true>* relobj,
1376 const unsigned char* syms,
1378 const char* sym_names,
1379 size_t sym_name_size,
1380 Symbol** sympointers);
1384 Symbol_table::add_from_relobj<32, false>(
1385 Sized_relobj<32, false>* relobj,
1386 const unsigned char* syms,
1388 const char* sym_names,
1389 size_t sym_name_size,
1390 Symbol** sympointers);
1394 Symbol_table::add_from_relobj<64, true>(
1395 Sized_relobj<64, true>* relobj,
1396 const unsigned char* syms,
1398 const char* sym_names,
1399 size_t sym_name_size,
1400 Symbol** sympointers);
1404 Symbol_table::add_from_relobj<64, false>(
1405 Sized_relobj<64, false>* relobj,
1406 const unsigned char* syms,
1408 const char* sym_names,
1409 size_t sym_name_size,
1410 Symbol** sympointers);
1414 Symbol_table::add_from_dynobj<32, true>(
1415 Sized_dynobj<32, true>* dynobj,
1416 const unsigned char* syms,
1418 const char* sym_names,
1419 size_t sym_name_size,
1420 const unsigned char* versym,
1422 const std::vector<const char*>* version_map);
1426 Symbol_table::add_from_dynobj<32, false>(
1427 Sized_dynobj<32, false>* dynobj,
1428 const unsigned char* syms,
1430 const char* sym_names,
1431 size_t sym_name_size,
1432 const unsigned char* versym,
1434 const std::vector<const char*>* version_map);
1438 Symbol_table::add_from_dynobj<64, true>(
1439 Sized_dynobj<64, true>* dynobj,
1440 const unsigned char* syms,
1442 const char* sym_names,
1443 size_t sym_name_size,
1444 const unsigned char* versym,
1446 const std::vector<const char*>* version_map);
1450 Symbol_table::add_from_dynobj<64, false>(
1451 Sized_dynobj<64, false>* dynobj,
1452 const unsigned char* syms,
1454 const char* sym_names,
1455 size_t sym_name_size,
1456 const unsigned char* versym,
1458 const std::vector<const char*>* version_map);
1460 } // End namespace gold.