+ this->weak_aliases_[from_sym] = *q;
+ from_sym->set_has_alias();
+ from_sym = *q;
+ }
+
+ if (from_sym != *p)
+ {
+ this->weak_aliases_[from_sym] = *p;
+ from_sym->set_has_alias();
+ }
+
+ p = q - 1;
+ }
+}
+
+// Create and return a specially defined symbol. If ONLY_IF_REF is
+// true, then only create the symbol if there is a reference to it.
+// If this does not return NULL, it sets *POLDSYM to the existing
+// symbol if there is one. This canonicalizes *PNAME and *PVERSION.
+
+template<int size, bool big_endian>
+Sized_symbol<size>*
+Symbol_table::define_special_symbol(const Target* target, const char** pname,
+ const char** pversion, bool only_if_ref,
+ Sized_symbol<size>** poldsym
+ ACCEPT_SIZE_ENDIAN)
+{
+ Symbol* oldsym;
+ Sized_symbol<size>* sym;
+ bool add_to_table = false;
+ typename Symbol_table_type::iterator add_loc = this->table_.end();
+
+ // If the caller didn't give us a version, see if we get one from
+ // the version script.
+ if (*pversion == NULL)
+ {
+ const std::string& v(this->version_script_.get_symbol_version(*pname));
+ if (!v.empty())
+ *pversion = v.c_str();
+ }
+
+ if (only_if_ref)
+ {
+ oldsym = this->lookup(*pname, *pversion);
+ if (oldsym == NULL || !oldsym->is_undefined())
+ return NULL;
+
+ *pname = oldsym->name();
+ *pversion = oldsym->version();
+ }
+ else
+ {
+ // Canonicalize NAME and VERSION.
+ Stringpool::Key name_key;
+ *pname = this->namepool_.add(*pname, true, &name_key);
+
+ Stringpool::Key version_key = 0;
+ if (*pversion != NULL)
+ *pversion = this->namepool_.add(*pversion, true, &version_key);
+
+ Symbol* const snull = NULL;
+ std::pair<typename Symbol_table_type::iterator, bool> ins =
+ this->table_.insert(std::make_pair(std::make_pair(name_key,
+ version_key),
+ snull));
+
+ if (!ins.second)
+ {
+ // We already have a symbol table entry for NAME/VERSION.
+ oldsym = ins.first->second;
+ gold_assert(oldsym != NULL);
+ }
+ else
+ {
+ // We haven't seen this symbol before.
+ gold_assert(ins.first->second == NULL);
+ add_to_table = true;
+ add_loc = ins.first;
+ oldsym = NULL;
+ }
+ }
+
+ if (!target->has_make_symbol())
+ sym = new Sized_symbol<size>();
+ else
+ {
+ gold_assert(target->get_size() == size);
+ gold_assert(target->is_big_endian() ? big_endian : !big_endian);
+ typedef Sized_target<size, big_endian> My_target;
+ const My_target* sized_target =
+ static_cast<const My_target*>(target);
+ sym = sized_target->make_symbol();
+ if (sym == NULL)
+ return NULL;
+ }
+
+ if (add_to_table)
+ add_loc->second = sym;
+ else
+ gold_assert(oldsym != NULL);
+
+ *poldsym = this->get_sized_symbol SELECT_SIZE_NAME(size) (oldsym
+ SELECT_SIZE(size));
+
+ return sym;
+}
+
+// Define a symbol based on an Output_data.
+
+Symbol*
+Symbol_table::define_in_output_data(const Target* target, const char* name,
+ const char* version, Output_data* od,
+ uint64_t value, uint64_t symsize,
+ elfcpp::STT type, elfcpp::STB binding,
+ elfcpp::STV visibility,
+ unsigned char nonvis,
+ bool offset_is_from_end,
+ bool only_if_ref)
+{
+ if (parameters->get_size() == 32)
+ {
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+ return this->do_define_in_output_data<32>(target, name, version, od,
+ value, symsize, type, binding,
+ visibility, nonvis,
+ offset_is_from_end,
+ only_if_ref);
+#else
+ gold_unreachable();
+#endif
+ }
+ else if (parameters->get_size() == 64)
+ {
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+ return this->do_define_in_output_data<64>(target, name, version, od,
+ value, symsize, type, binding,
+ visibility, nonvis,
+ offset_is_from_end,
+ only_if_ref);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ gold_unreachable();
+}
+
+// Define a symbol in an Output_data, sized version.
+
+template<int size>
+Sized_symbol<size>*
+Symbol_table::do_define_in_output_data(
+ const Target* target,
+ const char* name,
+ const char* version,
+ Output_data* od,
+ typename elfcpp::Elf_types<size>::Elf_Addr value,
+ typename elfcpp::Elf_types<size>::Elf_WXword symsize,
+ elfcpp::STT type,
+ elfcpp::STB binding,
+ elfcpp::STV visibility,
+ unsigned char nonvis,
+ bool offset_is_from_end,
+ bool only_if_ref)
+{
+ Sized_symbol<size>* sym;
+ Sized_symbol<size>* oldsym;
+
+ if (parameters->is_big_endian())
+ {
+#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
+ sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) (
+ target, &name, &version, only_if_ref, &oldsym
+ SELECT_SIZE_ENDIAN(size, true));
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
+ sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) (
+ target, &name, &version, only_if_ref, &oldsym
+ SELECT_SIZE_ENDIAN(size, false));
+#else
+ gold_unreachable();
+#endif
+ }
+
+ if (sym == NULL)
+ return NULL;
+
+ gold_assert(version == NULL || oldsym != NULL);
+ sym->init(name, od, value, symsize, type, binding, visibility, nonvis,
+ offset_is_from_end);
+
+ if (oldsym == NULL)
+ {
+ if (binding == elfcpp::STB_LOCAL
+ || this->version_script_.symbol_is_local(name))
+ this->force_local(sym);
+ return sym;
+ }
+
+ if (Symbol_table::should_override_with_special(oldsym))
+ this->override_with_special(oldsym, sym);
+ delete sym;
+ return oldsym;
+}
+
+// Define a symbol based on an Output_segment.
+
+Symbol*
+Symbol_table::define_in_output_segment(const Target* target, const char* name,
+ const char* version, Output_segment* os,
+ uint64_t value, uint64_t symsize,
+ elfcpp::STT type, elfcpp::STB binding,
+ elfcpp::STV visibility,
+ unsigned char nonvis,
+ Symbol::Segment_offset_base offset_base,
+ bool only_if_ref)
+{
+ if (parameters->get_size() == 32)
+ {
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+ return this->do_define_in_output_segment<32>(target, name, version, os,
+ value, symsize, type,
+ binding, visibility, nonvis,
+ offset_base, only_if_ref);
+#else
+ gold_unreachable();
+#endif
+ }
+ else if (parameters->get_size() == 64)
+ {
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+ return this->do_define_in_output_segment<64>(target, name, version, os,
+ value, symsize, type,
+ binding, visibility, nonvis,
+ offset_base, only_if_ref);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ gold_unreachable();
+}
+
+// Define a symbol in an Output_segment, sized version.
+
+template<int size>
+Sized_symbol<size>*
+Symbol_table::do_define_in_output_segment(
+ const Target* target,
+ const char* name,
+ const char* version,
+ Output_segment* os,
+ typename elfcpp::Elf_types<size>::Elf_Addr value,
+ typename elfcpp::Elf_types<size>::Elf_WXword symsize,
+ elfcpp::STT type,
+ elfcpp::STB binding,
+ elfcpp::STV visibility,
+ unsigned char nonvis,
+ Symbol::Segment_offset_base offset_base,
+ bool only_if_ref)
+{
+ Sized_symbol<size>* sym;
+ Sized_symbol<size>* oldsym;
+
+ if (parameters->is_big_endian())
+ {
+#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
+ sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) (
+ target, &name, &version, only_if_ref, &oldsym
+ SELECT_SIZE_ENDIAN(size, true));
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
+ sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) (
+ target, &name, &version, only_if_ref, &oldsym
+ SELECT_SIZE_ENDIAN(size, false));
+#else
+ gold_unreachable();
+#endif
+ }
+
+ if (sym == NULL)
+ return NULL;
+
+ gold_assert(version == NULL || oldsym != NULL);
+ sym->init(name, os, value, symsize, type, binding, visibility, nonvis,
+ offset_base);
+
+ if (oldsym == NULL)
+ {
+ if (binding == elfcpp::STB_LOCAL
+ || this->version_script_.symbol_is_local(name))
+ this->force_local(sym);
+ return sym;
+ }
+
+ if (Symbol_table::should_override_with_special(oldsym))
+ this->override_with_special(oldsym, sym);
+ delete sym;
+ return oldsym;
+}
+
+// Define a special symbol with a constant value. It is a multiple
+// definition error if this symbol is already defined.
+
+Symbol*
+Symbol_table::define_as_constant(const Target* target, const char* name,
+ const char* version, uint64_t value,
+ uint64_t symsize, elfcpp::STT type,
+ elfcpp::STB binding, elfcpp::STV visibility,
+ unsigned char nonvis, bool only_if_ref)
+{
+ if (parameters->get_size() == 32)
+ {
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+ return this->do_define_as_constant<32>(target, name, version, value,
+ symsize, type, binding,
+ visibility, nonvis, only_if_ref);
+#else
+ gold_unreachable();
+#endif
+ }
+ else if (parameters->get_size() == 64)
+ {
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+ return this->do_define_as_constant<64>(target, name, version, value,
+ symsize, type, binding,
+ visibility, nonvis, only_if_ref);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ gold_unreachable();
+}
+
+// Define a symbol as a constant, sized version.
+
+template<int size>
+Sized_symbol<size>*
+Symbol_table::do_define_as_constant(
+ const Target* target,
+ const char* name,
+ const char* version,
+ typename elfcpp::Elf_types<size>::Elf_Addr value,
+ typename elfcpp::Elf_types<size>::Elf_WXword symsize,
+ elfcpp::STT type,
+ elfcpp::STB binding,
+ elfcpp::STV visibility,
+ unsigned char nonvis,
+ bool only_if_ref)
+{
+ Sized_symbol<size>* sym;
+ Sized_symbol<size>* oldsym;
+
+ if (parameters->is_big_endian())
+ {
+#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
+ sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) (
+ target, &name, &version, only_if_ref, &oldsym
+ SELECT_SIZE_ENDIAN(size, true));
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
+ sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) (
+ target, &name, &version, only_if_ref, &oldsym
+ SELECT_SIZE_ENDIAN(size, false));
+#else
+ gold_unreachable();
+#endif
+ }
+
+ if (sym == NULL)
+ return NULL;
+
+ gold_assert(version == NULL || version == name || oldsym != NULL);
+ sym->init(name, value, symsize, type, binding, visibility, nonvis);
+
+ if (oldsym == NULL)
+ {
+ if (binding == elfcpp::STB_LOCAL
+ || this->version_script_.symbol_is_local(name))
+ this->force_local(sym);
+ return sym;
+ }
+
+ if (Symbol_table::should_override_with_special(oldsym))
+ this->override_with_special(oldsym, sym);
+ delete sym;
+ return oldsym;
+}
+
+// Define a set of symbols in output sections.
+
+void
+Symbol_table::define_symbols(const Layout* layout, const Target* target,
+ int count, const Define_symbol_in_section* p)
+{
+ for (int i = 0; i < count; ++i, ++p)
+ {
+ Output_section* os = layout->find_output_section(p->output_section);
+ if (os != NULL)
+ this->define_in_output_data(target, p->name, NULL, os, p->value,
+ p->size, p->type, p->binding,
+ p->visibility, p->nonvis,
+ p->offset_is_from_end, p->only_if_ref);
+ else
+ this->define_as_constant(target, p->name, NULL, 0, p->size, p->type,
+ p->binding, p->visibility, p->nonvis,
+ p->only_if_ref);
+ }
+}
+
+// Define a set of symbols in output segments.
+
+void
+Symbol_table::define_symbols(const Layout* layout, const Target* target,
+ int count, const Define_symbol_in_segment* p)
+{
+ for (int i = 0; i < count; ++i, ++p)
+ {
+ Output_segment* os = layout->find_output_segment(p->segment_type,
+ p->segment_flags_set,
+ p->segment_flags_clear);
+ if (os != NULL)
+ this->define_in_output_segment(target, p->name, NULL, os, p->value,
+ p->size, p->type, p->binding,
+ p->visibility, p->nonvis,
+ p->offset_base, p->only_if_ref);
+ else
+ this->define_as_constant(target, p->name, NULL, 0, p->size, p->type,
+ p->binding, p->visibility, p->nonvis,
+ p->only_if_ref);
+ }
+}
+
+// Define CSYM using a COPY reloc. POSD is the Output_data where the
+// symbol should be defined--typically a .dyn.bss section. VALUE is
+// the offset within POSD.
+
+template<int size>
+void
+Symbol_table::define_with_copy_reloc(
+ const Target* target,
+ Sized_symbol<size>* csym,
+ Output_data* posd,
+ typename elfcpp::Elf_types<size>::Elf_Addr value)
+{
+ gold_assert(csym->is_from_dynobj());
+ gold_assert(!csym->is_copied_from_dynobj());
+ Object* object = csym->object();
+ gold_assert(object->is_dynamic());
+ Dynobj* dynobj = static_cast<Dynobj*>(object);
+
+ // Our copied variable has to override any variable in a shared
+ // library.
+ elfcpp::STB binding = csym->binding();
+ if (binding == elfcpp::STB_WEAK)
+ binding = elfcpp::STB_GLOBAL;
+
+ this->define_in_output_data(target, csym->name(), csym->version(),
+ posd, value, csym->symsize(),
+ csym->type(), binding,
+ csym->visibility(), csym->nonvis(),
+ false, false);
+
+ csym->set_is_copied_from_dynobj();
+ csym->set_needs_dynsym_entry();
+
+ this->copied_symbol_dynobjs_[csym] = dynobj;
+
+ // We have now defined all aliases, but we have not entered them all
+ // in the copied_symbol_dynobjs_ map.
+ if (csym->has_alias())
+ {
+ Symbol* sym = csym;
+ while (true)
+ {
+ sym = this->weak_aliases_[sym];
+ if (sym == csym)
+ break;
+ gold_assert(sym->output_data() == posd);
+
+ sym->set_is_copied_from_dynobj();
+ this->copied_symbol_dynobjs_[sym] = dynobj;
+ }
+ }
+}
+
+// SYM is defined using a COPY reloc. Return the dynamic object where
+// the original definition was found.
+
+Dynobj*
+Symbol_table::get_copy_source(const Symbol* sym) const
+{
+ gold_assert(sym->is_copied_from_dynobj());
+ Copied_symbol_dynobjs::const_iterator p =
+ this->copied_symbol_dynobjs_.find(sym);
+ gold_assert(p != this->copied_symbol_dynobjs_.end());
+ return p->second;
+}
+
+// Set the dynamic symbol indexes. INDEX is the index of the first
+// global dynamic symbol. Pointers to the symbols are stored into the
+// vector SYMS. The names are added to DYNPOOL. This returns an
+// updated dynamic symbol index.
+
+unsigned int
+Symbol_table::set_dynsym_indexes(const Target* target,
+ unsigned int index,
+ std::vector<Symbol*>* syms,
+ Stringpool* dynpool,
+ Versions* versions)
+{
+ for (Symbol_table_type::iterator p = this->table_.begin();
+ p != this->table_.end();
+ ++p)
+ {
+ Symbol* sym = p->second;
+
+ // Note that SYM may already have a dynamic symbol index, since
+ // some symbols appear more than once in the symbol table, with
+ // and without a version.
+
+ if (!sym->should_add_dynsym_entry())
+ sym->set_dynsym_index(-1U);
+ else if (!sym->has_dynsym_index())
+ {
+ sym->set_dynsym_index(index);
+ ++index;
+ syms->push_back(sym);
+ dynpool->add(sym->name(), false, NULL);
+
+ // Record any version information.
+ if (sym->version() != NULL)
+ versions->record_version(this, dynpool, sym);
+ }
+ }
+
+ // Finish up the versions. In some cases this may add new dynamic
+ // symbols.
+ index = versions->finalize(target, this, index, syms);
+
+ return index;
+}
+
+// Set the final values for all the symbols. The index of the first
+// global symbol in the output file is *PLOCAL_SYMCOUNT. Record the
+// file offset OFF. Add their names to POOL. Return the new file
+// offset. Update *PLOCAL_SYMCOUNT if necessary.
+
+off_t
+Symbol_table::finalize(off_t off, off_t dynoff, size_t dyn_global_index,
+ size_t dyncount, Stringpool* pool,
+ unsigned int *plocal_symcount)
+{
+ off_t ret;
+
+ gold_assert(*plocal_symcount != 0);
+ this->first_global_index_ = *plocal_symcount;
+
+ this->dynamic_offset_ = dynoff;
+ this->first_dynamic_global_index_ = dyn_global_index;
+ this->dynamic_count_ = dyncount;
+
+ if (parameters->get_size() == 32)
+ {
+#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE)
+ ret = this->sized_finalize<32>(off, pool, plocal_symcount);
+#else
+ gold_unreachable();
+#endif
+ }
+ else if (parameters->get_size() == 64)
+ {
+#if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE)
+ ret = this->sized_finalize<64>(off, pool, plocal_symcount);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ gold_unreachable();
+
+ // Now that we have the final symbol table, we can reliably note
+ // which symbols should get warnings.
+ this->warnings_.note_warnings(this);
+
+ return ret;
+}
+
+// SYM is going into the symbol table at *PINDEX. Add the name to
+// POOL, update *PINDEX and *POFF.
+
+template<int size>
+void
+Symbol_table::add_to_final_symtab(Symbol* sym, Stringpool* pool,
+ unsigned int* pindex, off_t* poff)
+{
+ sym->set_symtab_index(*pindex);
+ pool->add(sym->name(), false, NULL);
+ ++*pindex;
+ *poff += elfcpp::Elf_sizes<size>::sym_size;
+}
+
+// Set the final value for all the symbols. This is called after
+// Layout::finalize, so all the output sections have their final
+// address.
+
+template<int size>
+off_t
+Symbol_table::sized_finalize(off_t off, Stringpool* pool,
+ unsigned int* plocal_symcount)
+{
+ off = align_address(off, size >> 3);
+ this->offset_ = off;
+
+ unsigned int index = *plocal_symcount;
+ const unsigned int orig_index = index;
+
+ // First do all the symbols which have been forced to be local, as
+ // they must appear before all global symbols.
+ for (Forced_locals::iterator p = this->forced_locals_.begin();
+ p != this->forced_locals_.end();
+ ++p)
+ {
+ Symbol* sym = *p;
+ gold_assert(sym->is_forced_local());
+ if (this->sized_finalize_symbol<size>(sym))
+ {
+ this->add_to_final_symtab<size>(sym, pool, &index, &off);
+ ++*plocal_symcount;
+ }
+ }
+
+ // Now do all the remaining symbols.
+ for (Symbol_table_type::iterator p = this->table_.begin();
+ p != this->table_.end();
+ ++p)
+ {
+ Symbol* sym = p->second;
+ if (this->sized_finalize_symbol<size>(sym))
+ this->add_to_final_symtab<size>(sym, pool, &index, &off);
+ }
+
+ this->output_count_ = index - orig_index;
+
+ return off;
+}
+
+// Finalize the symbol SYM. This returns true if the symbol should be
+// added to the symbol table, false otherwise.
+
+template<int size>
+bool
+Symbol_table::sized_finalize_symbol(Symbol* unsized_sym)
+{
+ Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym);
+
+ // The default version of a symbol may appear twice in the symbol
+ // table. We only need to finalize it once.
+ if (sym->has_symtab_index())
+ return false;
+
+ if (!sym->in_reg())
+ {
+ gold_assert(!sym->has_symtab_index());
+ sym->set_symtab_index(-1U);
+ gold_assert(sym->dynsym_index() == -1U);
+ return false;
+ }
+
+ typename Sized_symbol<size>::Value_type value;
+
+ switch (sym->source())
+ {
+ case Symbol::FROM_OBJECT:
+ {
+ unsigned int shndx = sym->shndx();
+
+ // FIXME: We need some target specific support here.
+ if (shndx >= elfcpp::SHN_LORESERVE
+ && shndx != elfcpp::SHN_ABS)
+ {
+ gold_error(_("%s: unsupported symbol section 0x%x"),
+ sym->demangled_name().c_str(), shndx);
+ shndx = elfcpp::SHN_UNDEF;
+ }
+
+ Object* symobj = sym->object();
+ if (symobj->is_dynamic())
+ {
+ value = 0;
+ shndx = elfcpp::SHN_UNDEF;
+ }
+ else if (shndx == elfcpp::SHN_UNDEF)
+ value = 0;
+ else if (shndx == elfcpp::SHN_ABS)
+ value = sym->value();
+ else
+ {
+ Relobj* relobj = static_cast<Relobj*>(symobj);
+ section_offset_type secoff;
+ Output_section* os = relobj->output_section(shndx, &secoff);
+
+ if (os == NULL)
+ {
+ sym->set_symtab_index(-1U);
+ gold_assert(sym->dynsym_index() == -1U);
+ return false;
+ }
+
+ if (sym->type() == elfcpp::STT_TLS)
+ value = sym->value() + os->tls_offset() + secoff;
+ else
+ value = sym->value() + os->address() + secoff;
+ }
+ }
+ break;
+
+ case Symbol::IN_OUTPUT_DATA:
+ {
+ Output_data* od = sym->output_data();
+ value = sym->value() + od->address();
+ if (sym->offset_is_from_end())
+ value += od->data_size();
+ }
+ break;
+
+ case Symbol::IN_OUTPUT_SEGMENT:
+ {
+ Output_segment* os = sym->output_segment();
+ value = sym->value() + os->vaddr();
+ switch (sym->offset_base())
+ {
+ case Symbol::SEGMENT_START:
+ break;
+ case Symbol::SEGMENT_END:
+ value += os->memsz();
+ break;
+ case Symbol::SEGMENT_BSS:
+ value += os->filesz();
+ break;
+ default:
+ gold_unreachable();
+ }
+ }
+ break;
+
+ case Symbol::CONSTANT:
+ value = sym->value();
+ break;
+
+ default:
+ gold_unreachable();
+ }
+
+ sym->set_value(value);
+
+ if (parameters->strip_all())
+ {
+ sym->set_symtab_index(-1U);
+ return false;
+ }
+
+ return true;
+}
+
+// Write out the global symbols.
+
+void
+Symbol_table::write_globals(const Input_objects* input_objects,
+ const Stringpool* sympool,
+ const Stringpool* dynpool, Output_file* of) const
+{
+ if (parameters->get_size() == 32)
+ {
+ if (parameters->is_big_endian())
+ {
+#ifdef HAVE_TARGET_32_BIG
+ this->sized_write_globals<32, true>(input_objects, sympool,
+ dynpool, of);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#ifdef HAVE_TARGET_32_LITTLE
+ this->sized_write_globals<32, false>(input_objects, sympool,
+ dynpool, of);
+#else
+ gold_unreachable();
+#endif
+ }
+ }
+ else if (parameters->get_size() == 64)
+ {
+ if (parameters->is_big_endian())
+ {
+#ifdef HAVE_TARGET_64_BIG
+ this->sized_write_globals<64, true>(input_objects, sympool,
+ dynpool, of);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#ifdef HAVE_TARGET_64_LITTLE
+ this->sized_write_globals<64, false>(input_objects, sympool,
+ dynpool, of);
+#else
+ gold_unreachable();
+#endif
+ }
+ }
+ else
+ gold_unreachable();
+}
+
+// Write out the global symbols.
+
+template<int size, bool big_endian>
+void
+Symbol_table::sized_write_globals(const Input_objects* input_objects,
+ const Stringpool* sympool,
+ const Stringpool* dynpool,
+ Output_file* of) const
+{
+ const Target* const target = input_objects->target();
+
+ const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
+
+ const unsigned int output_count = this->output_count_;
+ const section_size_type oview_size = output_count * sym_size;
+ const unsigned int first_global_index = this->first_global_index_;
+ unsigned char* const psyms = of->get_output_view(this->offset_, oview_size);
+
+ const unsigned int dynamic_count = this->dynamic_count_;
+ const section_size_type dynamic_size = dynamic_count * sym_size;
+ const unsigned int first_dynamic_global_index =
+ this->first_dynamic_global_index_;
+ unsigned char* dynamic_view;
+ if (this->dynamic_offset_ == 0)
+ dynamic_view = NULL;
+ else
+ dynamic_view = of->get_output_view(this->dynamic_offset_, dynamic_size);
+
+ for (Symbol_table_type::const_iterator p = this->table_.begin();
+ p != this->table_.end();
+ ++p)
+ {
+ Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second);
+
+ // Possibly warn about unresolved symbols in shared libraries.
+ this->warn_about_undefined_dynobj_symbol(input_objects, sym);
+
+ unsigned int sym_index = sym->symtab_index();
+ unsigned int dynsym_index;
+ if (dynamic_view == NULL)
+ dynsym_index = -1U;
+ else
+ dynsym_index = sym->dynsym_index();
+
+ if (sym_index == -1U && dynsym_index == -1U)
+ {
+ // This symbol is not included in the output file.
+ continue;
+ }
+
+ unsigned int shndx;
+ typename elfcpp::Elf_types<32>::Elf_Addr value = sym->value();
+ switch (sym->source())
+ {
+ case Symbol::FROM_OBJECT:
+ {
+ unsigned int in_shndx = sym->shndx();
+
+ // FIXME: We need some target specific support here.
+ if (in_shndx >= elfcpp::SHN_LORESERVE
+ && in_shndx != elfcpp::SHN_ABS)
+ {
+ gold_error(_("%s: unsupported symbol section 0x%x"),
+ sym->demangled_name().c_str(), in_shndx);
+ shndx = in_shndx;
+ }
+ else
+ {
+ Object* symobj = sym->object();
+ if (symobj->is_dynamic())
+ {
+ if (sym->needs_dynsym_value())
+ value = target->dynsym_value(sym);
+ shndx = elfcpp::SHN_UNDEF;
+ }
+ else if (in_shndx == elfcpp::SHN_UNDEF
+ || in_shndx == elfcpp::SHN_ABS)
+ shndx = in_shndx;
+ else
+ {
+ Relobj* relobj = static_cast<Relobj*>(symobj);
+ section_offset_type secoff;
+ Output_section* os = relobj->output_section(in_shndx,
+ &secoff);
+ gold_assert(os != NULL);
+ shndx = os->out_shndx();
+ }
+ }
+ }
+ break;
+
+ case Symbol::IN_OUTPUT_DATA:
+ shndx = sym->output_data()->out_shndx();
+ break;
+
+ case Symbol::IN_OUTPUT_SEGMENT:
+ shndx = elfcpp::SHN_ABS;
+ break;
+
+ case Symbol::CONSTANT:
+ shndx = elfcpp::SHN_ABS;
+ break;
+
+ default:
+ gold_unreachable();
+ }
+
+ if (sym_index != -1U)
+ {
+ sym_index -= first_global_index;
+ gold_assert(sym_index < output_count);
+ unsigned char* ps = psyms + (sym_index * sym_size);
+ this->sized_write_symbol SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
+ sym, sym->value(), shndx, sympool, ps
+ SELECT_SIZE_ENDIAN(size, big_endian));
+ }
+
+ if (dynsym_index != -1U)
+ {
+ dynsym_index -= first_dynamic_global_index;
+ gold_assert(dynsym_index < dynamic_count);
+ unsigned char* pd = dynamic_view + (dynsym_index * sym_size);
+ this->sized_write_symbol SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
+ sym, value, shndx, dynpool, pd
+ SELECT_SIZE_ENDIAN(size, big_endian));
+ }
+ }
+
+ of->write_output_view(this->offset_, oview_size, psyms);
+ if (dynamic_view != NULL)
+ of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view);
+}
+
+// Write out the symbol SYM, in section SHNDX, to P. POOL is the
+// strtab holding the name.
+
+template<int size, bool big_endian>
+void
+Symbol_table::sized_write_symbol(
+ Sized_symbol<size>* sym,
+ typename elfcpp::Elf_types<size>::Elf_Addr value,
+ unsigned int shndx,
+ const Stringpool* pool,
+ unsigned char* p
+ ACCEPT_SIZE_ENDIAN) const
+{
+ elfcpp::Sym_write<size, big_endian> osym(p);
+ osym.put_st_name(pool->get_offset(sym->name()));
+ osym.put_st_value(value);
+ osym.put_st_size(sym->symsize());
+ // A version script may have overridden the default binding.
+ if (sym->is_forced_local())
+ osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, sym->type()));
+ else
+ osym.put_st_info(elfcpp::elf_st_info(sym->binding(), sym->type()));
+ osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis()));
+ osym.put_st_shndx(shndx);
+}
+
+// Check for unresolved symbols in shared libraries. This is
+// controlled by the --allow-shlib-undefined option.
+
+// We only warn about libraries for which we have seen all the
+// DT_NEEDED entries. We don't try to track down DT_NEEDED entries
+// which were not seen in this link. If we didn't see a DT_NEEDED
+// entry, we aren't going to be able to reliably report whether the
+// symbol is undefined.
+
+// We also don't warn about libraries found in the system library
+// directory (the directory were we find libc.so); we assume that
+// those libraries are OK. This heuristic avoids problems in
+// GNU/Linux, in which -ldl can have undefined references satisfied by
+// ld-linux.so.
+
+inline void
+Symbol_table::warn_about_undefined_dynobj_symbol(
+ const Input_objects* input_objects,
+ Symbol* sym) const
+{
+ if (sym->source() == Symbol::FROM_OBJECT
+ && sym->object()->is_dynamic()
+ && sym->shndx() == elfcpp::SHN_UNDEF
+ && sym->binding() != elfcpp::STB_WEAK
+ && !parameters->allow_shlib_undefined()
+ && !input_objects->target()->is_defined_by_abi(sym)
+ && !input_objects->found_in_system_library_directory(sym->object()))
+ {
+ // A very ugly cast.
+ Dynobj* dynobj = static_cast<Dynobj*>(sym->object());
+ if (!dynobj->has_unknown_needed_entries())
+ gold_error(_("%s: undefined reference to '%s'"),
+ sym->object()->name().c_str(),
+ sym->demangled_name().c_str());
+ }
+}
+
+// Write out a section symbol. Return the update offset.
+
+void
+Symbol_table::write_section_symbol(const Output_section *os,
+ Output_file* of,
+ off_t offset) const
+{
+ if (parameters->get_size() == 32)
+ {
+ if (parameters->is_big_endian())
+ {
+#ifdef HAVE_TARGET_32_BIG
+ this->sized_write_section_symbol<32, true>(os, of, offset);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#ifdef HAVE_TARGET_32_LITTLE
+ this->sized_write_section_symbol<32, false>(os, of, offset);
+#else
+ gold_unreachable();
+#endif
+ }
+ }
+ else if (parameters->get_size() == 64)
+ {
+ if (parameters->is_big_endian())
+ {
+#ifdef HAVE_TARGET_64_BIG
+ this->sized_write_section_symbol<64, true>(os, of, offset);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#ifdef HAVE_TARGET_64_LITTLE
+ this->sized_write_section_symbol<64, false>(os, of, offset);
+#else
+ gold_unreachable();
+#endif
+ }
+ }
+ else
+ gold_unreachable();
+}
+
+// Write out a section symbol, specialized for size and endianness.
+
+template<int size, bool big_endian>
+void
+Symbol_table::sized_write_section_symbol(const Output_section* os,
+ Output_file* of,
+ off_t offset) const
+{
+ const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
+
+ unsigned char* pov = of->get_output_view(offset, sym_size);
+
+ elfcpp::Sym_write<size, big_endian> osym(pov);
+ osym.put_st_name(0);
+ osym.put_st_value(os->address());
+ osym.put_st_size(0);
+ osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL,
+ elfcpp::STT_SECTION));
+ osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0));
+ osym.put_st_shndx(os->out_shndx());
+
+ of->write_output_view(offset, sym_size, pov);
+}
+
+// Print statistical information to stderr. This is used for --stats.
+
+void
+Symbol_table::print_stats() const
+{
+#if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP)
+ fprintf(stderr, _("%s: symbol table entries: %zu; buckets: %zu\n"),
+ program_name, this->table_.size(), this->table_.bucket_count());
+#else
+ fprintf(stderr, _("%s: symbol table entries: %zu\n"),
+ program_name, this->table_.size());
+#endif
+ this->namepool_.print_stats("symbol table stringpool");
+}
+
+// We check for ODR violations by looking for symbols with the same
+// name for which the debugging information reports that they were
+// defined in different source locations. When comparing the source
+// location, we consider instances with the same base filename and
+// line number to be the same. This is because different object
+// files/shared libraries can include the same header file using
+// different paths, and we don't want to report an ODR violation in
+// that case.
+
+// This struct is used to compare line information, as returned by
+// Dwarf_line_info::one_addr2line. It implements a < comparison
+// operator used with std::set.
+
+struct Odr_violation_compare
+{
+ bool
+ operator()(const std::string& s1, const std::string& s2) const
+ {
+ std::string::size_type pos1 = s1.rfind('/');
+ std::string::size_type pos2 = s2.rfind('/');
+ if (pos1 == std::string::npos
+ || pos2 == std::string::npos)
+ return s1 < s2;
+ return s1.compare(pos1, std::string::npos,
+ s2, pos2, std::string::npos) < 0;
+ }
+};
+
+// Check candidate_odr_violations_ to find symbols with the same name
+// but apparently different definitions (different source-file/line-no).
+
+void
+Symbol_table::detect_odr_violations(const Task* task,
+ const char* output_file_name) const
+{
+ for (Odr_map::const_iterator it = candidate_odr_violations_.begin();
+ it != candidate_odr_violations_.end();
+ ++it)
+ {
+ const char* symbol_name = it->first;
+ // We use a sorted set so the output is deterministic.
+ std::set<std::string, Odr_violation_compare> line_nums;
+
+ for (Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator
+ locs = it->second.begin();
+ locs != it->second.end();
+ ++locs)
+ {
+ // We need to lock the object in order to read it. This
+ // means that we have to run in a singleton Task. If we
+ // want to run this in a general Task for better
+ // performance, we will need one Task for object, plus
+ // appropriate locking to ensure that we don't conflict with
+ // other uses of the object.
+ Task_lock_obj<Object> tl(task, locs->object);
+ std::string lineno = Dwarf_line_info::one_addr2line(
+ locs->object, locs->shndx, locs->offset);
+ if (!lineno.empty())
+ line_nums.insert(lineno);
+ }
+
+ if (line_nums.size() > 1)
+ {
+ gold_warning(_("while linking %s: symbol '%s' defined in multiple "
+ "places (possible ODR violation):"),
+ output_file_name, demangle(symbol_name).c_str());
+ for (std::set<std::string>::const_iterator it2 = line_nums.begin();
+ it2 != line_nums.end();
+ ++it2)
+ fprintf(stderr, " %s\n", it2->c_str());
+ }
+ }
+}
+
+// Warnings functions.
+
+// Add a new warning.
+
+void
+Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj,
+ const std::string& warning)
+{
+ name = symtab->canonicalize_name(name);
+ this->warnings_[name].set(obj, warning);
+}
+
+// Look through the warnings and mark the symbols for which we should
+// warn. This is called during Layout::finalize when we know the
+// sources for all the symbols.
+
+void
+Warnings::note_warnings(Symbol_table* symtab)
+{
+ for (Warning_table::iterator p = this->warnings_.begin();
+ p != this->warnings_.end();
+ ++p)
+ {
+ Symbol* sym = symtab->lookup(p->first, NULL);
+ if (sym != NULL
+ && sym->source() == Symbol::FROM_OBJECT
+ && sym->object() == p->second.object)
+ sym->set_has_warning();
+ }
+}
+
+// Issue a warning. This is called when we see a relocation against a
+// symbol for which has a warning.
+
+template<int size, bool big_endian>
+void
+Warnings::issue_warning(const Symbol* sym,
+ const Relocate_info<size, big_endian>* relinfo,
+ size_t relnum, off_t reloffset) const
+{
+ gold_assert(sym->has_warning());
+ Warning_table::const_iterator p = this->warnings_.find(sym->name());
+ gold_assert(p != this->warnings_.end());
+ gold_warning_at_location(relinfo, relnum, reloffset,
+ "%s", p->second.text.c_str());
+}
+
+// Instantiate the templates we need. We could use the configure
+// script to restrict this to only the ones needed for implemented
+// targets.
+
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+template
+void
+Sized_symbol<32>::allocate_common(Output_data*, Value_type);
+#endif
+
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+template
+void
+Sized_symbol<64>::allocate_common(Output_data*, Value_type);
+#endif
+
+#ifdef HAVE_TARGET_32_LITTLE
+template
+void
+Symbol_table::add_from_relobj<32, false>(
+ Sized_relobj<32, false>* relobj,
+ const unsigned char* syms,
+ size_t count,
+ const char* sym_names,
+ size_t sym_name_size,
+ Sized_relobj<32, true>::Symbols* sympointers);
+#endif
+
+#ifdef HAVE_TARGET_32_BIG
+template
+void
+Symbol_table::add_from_relobj<32, true>(
+ Sized_relobj<32, true>* relobj,
+ const unsigned char* syms,
+ size_t count,
+ const char* sym_names,
+ size_t sym_name_size,
+ Sized_relobj<32, false>::Symbols* sympointers);
+#endif
+
+#ifdef HAVE_TARGET_64_LITTLE
+template
+void
+Symbol_table::add_from_relobj<64, false>(
+ Sized_relobj<64, false>* relobj,
+ const unsigned char* syms,
+ size_t count,
+ const char* sym_names,
+ size_t sym_name_size,
+ Sized_relobj<64, true>::Symbols* sympointers);
+#endif
+
+#ifdef HAVE_TARGET_64_BIG
+template
+void
+Symbol_table::add_from_relobj<64, true>(
+ Sized_relobj<64, true>* relobj,
+ const unsigned char* syms,
+ size_t count,
+ const char* sym_names,
+ size_t sym_name_size,
+ Sized_relobj<64, false>::Symbols* sympointers);
+#endif
+
+#ifdef HAVE_TARGET_32_LITTLE
+template
+void
+Symbol_table::add_from_dynobj<32, false>(
+ Sized_dynobj<32, false>* dynobj,
+ const unsigned char* syms,
+ size_t count,
+ const char* sym_names,
+ size_t sym_name_size,
+ const unsigned char* versym,
+ size_t versym_size,
+ const std::vector<const char*>* version_map);
+#endif
+
+#ifdef HAVE_TARGET_32_BIG
+template
+void
+Symbol_table::add_from_dynobj<32, true>(
+ Sized_dynobj<32, true>* dynobj,
+ const unsigned char* syms,
+ size_t count,
+ const char* sym_names,
+ size_t sym_name_size,
+ const unsigned char* versym,
+ size_t versym_size,
+ const std::vector<const char*>* version_map);
+#endif
+
+#ifdef HAVE_TARGET_64_LITTLE
+template
+void
+Symbol_table::add_from_dynobj<64, false>(
+ Sized_dynobj<64, false>* dynobj,
+ const unsigned char* syms,
+ size_t count,
+ const char* sym_names,
+ size_t sym_name_size,
+ const unsigned char* versym,
+ size_t versym_size,
+ const std::vector<const char*>* version_map);
+#endif
+
+#ifdef HAVE_TARGET_64_BIG
+template
+void
+Symbol_table::add_from_dynobj<64, true>(
+ Sized_dynobj<64, true>* dynobj,
+ const unsigned char* syms,
+ size_t count,
+ const char* sym_names,
+ size_t sym_name_size,
+ const unsigned char* versym,
+ size_t versym_size,
+ const std::vector<const char*>* version_map);
+#endif
+
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+template
+void
+Symbol_table::define_with_copy_reloc<32>(
+ const Target* target,
+ Sized_symbol<32>* sym,
+ Output_data* posd,
+ elfcpp::Elf_types<32>::Elf_Addr value);
+#endif
+
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+template
+void
+Symbol_table::define_with_copy_reloc<64>(
+ const Target* target,
+ Sized_symbol<64>* sym,
+ Output_data* posd,
+ elfcpp::Elf_types<64>::Elf_Addr value);
+#endif
+
+#ifdef HAVE_TARGET_32_LITTLE
+template
+void
+Warnings::issue_warning<32, false>(const Symbol* sym,
+ const Relocate_info<32, false>* relinfo,
+ size_t relnum, off_t reloffset) const;
+#endif
+
+#ifdef HAVE_TARGET_32_BIG
+template
+void
+Warnings::issue_warning<32, true>(const Symbol* sym,
+ const Relocate_info<32, true>* relinfo,
+ size_t relnum, off_t reloffset) const;
+#endif
+
+#ifdef HAVE_TARGET_64_LITTLE
+template
+void
+Warnings::issue_warning<64, false>(const Symbol* sym,
+ const Relocate_info<64, false>* relinfo,
+ size_t relnum, off_t reloffset) const;
+#endif
+
+#ifdef HAVE_TARGET_64_BIG
+template
+void
+Warnings::issue_warning<64, true>(const Symbol* sym,
+ const Relocate_info<64, true>* relinfo,
+ size_t relnum, off_t reloffset) const;
+#endif