--- /dev/null
+// symtab.cc -- the gold symbol table
+
+// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+// Written by Ian Lance Taylor <iant@google.com>.
+
+// This file is part of gold.
+
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+// MA 02110-1301, USA.
+
+#include "gold.h"
+
+#include <cstring>
+#include <stdint.h>
+#include <algorithm>
+#include <set>
+#include <string>
+#include <utility>
+#include "demangle.h"
+
+#include "gc.h"
+#include "object.h"
+#include "dwarf_reader.h"
+#include "dynobj.h"
+#include "output.h"
+#include "target.h"
+#include "workqueue.h"
+#include "symtab.h"
+#include "demangle.h" // needed for --dynamic-list-cpp-new
+#include "plugin.h"
+
+namespace gold
+{
+
+// Class Symbol.
+
+// Initialize fields in Symbol. This initializes everything except u_
+// and source_.
+
+void
+Symbol::init_fields(const char* name, const char* version,
+ elfcpp::STT type, elfcpp::STB binding,
+ elfcpp::STV visibility, unsigned char nonvis)
+{
+ this->name_ = name;
+ this->version_ = version;
+ this->symtab_index_ = 0;
+ this->dynsym_index_ = 0;
+ this->got_offsets_.init();
+ this->plt_offset_ = 0;
+ this->type_ = type;
+ this->binding_ = binding;
+ this->visibility_ = visibility;
+ this->nonvis_ = nonvis;
+ this->is_target_special_ = false;
+ this->is_def_ = false;
+ this->is_forwarder_ = false;
+ this->has_alias_ = false;
+ this->needs_dynsym_entry_ = false;
+ this->in_reg_ = false;
+ this->in_dyn_ = false;
+ this->has_plt_offset_ = false;
+ this->has_warning_ = false;
+ this->is_copied_from_dynobj_ = false;
+ this->is_forced_local_ = false;
+ this->is_ordinary_shndx_ = false;
+ this->in_real_elf_ = false;
+}
+
+// Return the demangled version of the symbol's name, but only
+// if the --demangle flag was set.
+
+static std::string
+demangle(const char* name)
+{
+ if (!parameters->options().do_demangle())
+ return name;
+
+ // cplus_demangle allocates memory for the result it returns,
+ // and returns NULL if the name is already demangled.
+ char* demangled_name = cplus_demangle(name, DMGL_ANSI | DMGL_PARAMS);
+ if (demangled_name == NULL)
+ return name;
+
+ std::string retval(demangled_name);
+ free(demangled_name);
+ return retval;
+}
+
+std::string
+Symbol::demangled_name() const
+{
+ return demangle(this->name());
+}
+
+// Initialize the fields in the base class Symbol for SYM in OBJECT.
+
+template<int size, bool big_endian>
+void
+Symbol::init_base_object(const char* name, const char* version, Object* object,
+ const elfcpp::Sym<size, big_endian>& sym,
+ unsigned int st_shndx, bool is_ordinary)
+{
+ this->init_fields(name, version, sym.get_st_type(), sym.get_st_bind(),
+ sym.get_st_visibility(), sym.get_st_nonvis());
+ this->u_.from_object.object = object;
+ this->u_.from_object.shndx = st_shndx;
+ this->is_ordinary_shndx_ = is_ordinary;
+ this->source_ = FROM_OBJECT;
+ this->in_reg_ = !object->is_dynamic();
+ this->in_dyn_ = object->is_dynamic();
+ this->in_real_elf_ = object->pluginobj() == NULL;
+}
+
+// Initialize the fields in the base class Symbol for a symbol defined
+// in an Output_data.
+
+void
+Symbol::init_base_output_data(const char* name, const char* version,
+ Output_data* od, elfcpp::STT type,
+ elfcpp::STB binding, elfcpp::STV visibility,
+ unsigned char nonvis, bool offset_is_from_end)
+{
+ this->init_fields(name, version, type, binding, visibility, nonvis);
+ this->u_.in_output_data.output_data = od;
+ this->u_.in_output_data.offset_is_from_end = offset_is_from_end;
+ this->source_ = IN_OUTPUT_DATA;
+ this->in_reg_ = true;
+ this->in_real_elf_ = true;
+}
+
+// Initialize the fields in the base class Symbol for a symbol defined
+// in an Output_segment.
+
+void
+Symbol::init_base_output_segment(const char* name, const char* version,
+ Output_segment* os, elfcpp::STT type,
+ elfcpp::STB binding, elfcpp::STV visibility,
+ unsigned char nonvis,
+ Segment_offset_base offset_base)
+{
+ this->init_fields(name, version, type, binding, visibility, nonvis);
+ this->u_.in_output_segment.output_segment = os;
+ this->u_.in_output_segment.offset_base = offset_base;
+ this->source_ = IN_OUTPUT_SEGMENT;
+ this->in_reg_ = true;
+ this->in_real_elf_ = true;
+}
+
+// Initialize the fields in the base class Symbol for a symbol defined
+// as a constant.
+
+void
+Symbol::init_base_constant(const char* name, const char* version,
+ elfcpp::STT type, elfcpp::STB binding,
+ elfcpp::STV visibility, unsigned char nonvis)
+{
+ this->init_fields(name, version, type, binding, visibility, nonvis);
+ this->source_ = IS_CONSTANT;
+ this->in_reg_ = true;
+ this->in_real_elf_ = true;
+}
+
+// Initialize the fields in the base class Symbol for an undefined
+// symbol.
+
+void
+Symbol::init_base_undefined(const char* name, const char* version,
+ elfcpp::STT type, elfcpp::STB binding,
+ elfcpp::STV visibility, unsigned char nonvis)
+{
+ this->init_fields(name, version, type, binding, visibility, nonvis);
+ this->dynsym_index_ = -1U;
+ this->source_ = IS_UNDEFINED;
+ this->in_reg_ = true;
+ this->in_real_elf_ = true;
+}
+
+// Allocate a common symbol in the base.
+
+void
+Symbol::allocate_base_common(Output_data* od)
+{
+ gold_assert(this->is_common());
+ this->source_ = IN_OUTPUT_DATA;
+ this->u_.in_output_data.output_data = od;
+ this->u_.in_output_data.offset_is_from_end = false;
+}
+
+// Initialize the fields in Sized_symbol for SYM in OBJECT.
+
+template<int size>
+template<bool big_endian>
+void
+Sized_symbol<size>::init_object(const char* name, const char* version,
+ Object* object,
+ const elfcpp::Sym<size, big_endian>& sym,
+ unsigned int st_shndx, bool is_ordinary)
+{
+ this->init_base_object(name, version, object, sym, st_shndx, is_ordinary);
+ this->value_ = sym.get_st_value();
+ this->symsize_ = sym.get_st_size();
+}
+
+// Initialize the fields in Sized_symbol for a symbol defined in an
+// Output_data.
+
+template<int size>
+void
+Sized_symbol<size>::init_output_data(const char* name, const char* version,
+ Output_data* od, Value_type value,
+ Size_type symsize, elfcpp::STT type,
+ elfcpp::STB binding,
+ elfcpp::STV visibility,
+ unsigned char nonvis,
+ bool offset_is_from_end)
+{
+ this->init_base_output_data(name, version, od, type, binding, visibility,
+ nonvis, offset_is_from_end);
+ this->value_ = value;
+ this->symsize_ = symsize;
+}
+
+// Initialize the fields in Sized_symbol for a symbol defined in an
+// Output_segment.
+
+template<int size>
+void
+Sized_symbol<size>::init_output_segment(const char* name, const char* version,
+ Output_segment* os, Value_type value,
+ Size_type symsize, elfcpp::STT type,
+ elfcpp::STB binding,
+ elfcpp::STV visibility,
+ unsigned char nonvis,
+ Segment_offset_base offset_base)
+{
+ this->init_base_output_segment(name, version, os, type, binding, visibility,
+ nonvis, offset_base);
+ this->value_ = value;
+ this->symsize_ = symsize;
+}
+
+// Initialize the fields in Sized_symbol for a symbol defined as a
+// constant.
+
+template<int size>
+void
+Sized_symbol<size>::init_constant(const char* name, const char* version,
+ Value_type value, Size_type symsize,
+ elfcpp::STT type, elfcpp::STB binding,
+ elfcpp::STV visibility, unsigned char nonvis)
+{
+ this->init_base_constant(name, version, type, binding, visibility, nonvis);
+ this->value_ = value;
+ this->symsize_ = symsize;
+}
+
+// Initialize the fields in Sized_symbol for an undefined symbol.
+
+template<int size>
+void
+Sized_symbol<size>::init_undefined(const char* name, const char* version,
+ elfcpp::STT type, elfcpp::STB binding,
+ elfcpp::STV visibility, unsigned char nonvis)
+{
+ this->init_base_undefined(name, version, type, binding, visibility, nonvis);
+ this->value_ = 0;
+ this->symsize_ = 0;
+}
+
+// Return true if SHNDX represents a common symbol.
+
+bool
+Symbol::is_common_shndx(unsigned int shndx)
+{
+ return (shndx == elfcpp::SHN_COMMON
+ || shndx == parameters->target().small_common_shndx()
+ || shndx == parameters->target().large_common_shndx());
+}
+
+// Allocate a common symbol.
+
+template<int size>
+void
+Sized_symbol<size>::allocate_common(Output_data* od, Value_type value)
+{
+ this->allocate_base_common(od);
+ this->value_ = value;
+}
+
+// The ""'s around str ensure str is a string literal, so sizeof works.
+#define strprefix(var, str) (strncmp(var, str, sizeof("" str "") - 1) == 0)
+
+// Return true if this symbol should be added to the dynamic symbol
+// table.
+
+inline bool
+Symbol::should_add_dynsym_entry() const
+{
+ // If the symbol is used by a dynamic relocation, we need to add it.
+ if (this->needs_dynsym_entry())
+ return true;
+
+ // If this symbol's section is not added, the symbol need not be added.
+ // The section may have been GCed. Note that export_dynamic is being
+ // overridden here. This should not be done for shared objects.
+ if (parameters->options().gc_sections()
+ && !parameters->options().shared()
+ && this->source() == Symbol::FROM_OBJECT
+ && !this->object()->is_dynamic())
+ {
+ Relobj* relobj = static_cast<Relobj*>(this->object());
+ bool is_ordinary;
+ unsigned int shndx = this->shndx(&is_ordinary);
+ if (is_ordinary && shndx != elfcpp::SHN_UNDEF
+ && !relobj->is_section_included(shndx))
+ return false;
+ }
+
+ // If the symbol was forced local in a version script, do not add it.
+ if (this->is_forced_local())
+ return false;
+
+ // If the symbol was forced dynamic in a --dynamic-list file, add it.
+ if (parameters->options().in_dynamic_list(this->name()))
+ return true;
+
+ // If dynamic-list-data was specified, add any STT_OBJECT.
+ if (parameters->options().dynamic_list_data()
+ && !this->is_from_dynobj()
+ && this->type() == elfcpp::STT_OBJECT)
+ return true;
+
+ // If --dynamic-list-cpp-new was specified, add any new/delete symbol.
+ // If --dynamic-list-cpp-typeinfo was specified, add any typeinfo symbols.
+ if ((parameters->options().dynamic_list_cpp_new()
+ || parameters->options().dynamic_list_cpp_typeinfo())
+ && !this->is_from_dynobj())
+ {
+ // TODO(csilvers): We could probably figure out if we're an operator
+ // new/delete or typeinfo without the need to demangle.
+ char* demangled_name = cplus_demangle(this->name(),
+ DMGL_ANSI | DMGL_PARAMS);
+ if (demangled_name == NULL)
+ {
+ // Not a C++ symbol, so it can't satisfy these flags
+ }
+ else if (parameters->options().dynamic_list_cpp_new()
+ && (strprefix(demangled_name, "operator new")
+ || strprefix(demangled_name, "operator delete")))
+ {
+ free(demangled_name);
+ return true;
+ }
+ else if (parameters->options().dynamic_list_cpp_typeinfo()
+ && (strprefix(demangled_name, "typeinfo name for")
+ || strprefix(demangled_name, "typeinfo for")))
+ {
+ free(demangled_name);
+ return true;
+ }
+ else
+ free(demangled_name);
+ }
+
+ // If exporting all symbols or building a shared library,
+ // and the symbol is defined in a regular object and is
+ // externally visible, we need to add it.
+ if ((parameters->options().export_dynamic() || parameters->options().shared())
+ && !this->is_from_dynobj()
+ && this->is_externally_visible())
+ return true;
+
+ return false;
+}
+
+// Return true if the final value of this symbol is known at link
+// time.
+
+bool
+Symbol::final_value_is_known() const
+{
+ // If we are not generating an executable, then no final values are
+ // known, since they will change at runtime.
+ if (parameters->options().output_is_position_independent()
+ || parameters->options().relocatable())
+ return false;
+
+ // If the symbol is not from an object file, and is not undefined,
+ // then it is defined, and known.
+ if (this->source_ != FROM_OBJECT)
+ {
+ if (this->source_ != IS_UNDEFINED)
+ return true;
+ }
+ else
+ {
+ // If the symbol is from a dynamic object, then the final value
+ // is not known.
+ if (this->object()->is_dynamic())
+ return false;
+
+ // If the symbol is not undefined (it is defined or common),
+ // then the final value is known.
+ if (!this->is_undefined())
+ return true;
+ }
+
+ // If the symbol is undefined, then whether the final value is known
+ // depends on whether we are doing a static link. If we are doing a
+ // dynamic link, then the final value could be filled in at runtime.
+ // This could reasonably be the case for a weak undefined symbol.
+ return parameters->doing_static_link();
+}
+
+// Return the output section where this symbol is defined.
+
+Output_section*
+Symbol::output_section() const
+{
+ switch (this->source_)
+ {
+ case FROM_OBJECT:
+ {
+ unsigned int shndx = this->u_.from_object.shndx;
+ if (shndx != elfcpp::SHN_UNDEF && this->is_ordinary_shndx_)
+ {
+ gold_assert(!this->u_.from_object.object->is_dynamic());
+ gold_assert(this->u_.from_object.object->pluginobj() == NULL);
+ Relobj* relobj = static_cast<Relobj*>(this->u_.from_object.object);
+ return relobj->output_section(shndx);
+ }
+ return NULL;
+ }
+
+ case IN_OUTPUT_DATA:
+ return this->u_.in_output_data.output_data->output_section();
+
+ case IN_OUTPUT_SEGMENT:
+ case IS_CONSTANT:
+ case IS_UNDEFINED:
+ return NULL;
+
+ default:
+ gold_unreachable();
+ }
+}
+
+// Set the symbol's output section. This is used for symbols defined
+// in scripts. This should only be called after the symbol table has
+// been finalized.
+
+void
+Symbol::set_output_section(Output_section* os)
+{
+ switch (this->source_)
+ {
+ case FROM_OBJECT:
+ case IN_OUTPUT_DATA:
+ gold_assert(this->output_section() == os);
+ break;
+ case IS_CONSTANT:
+ this->source_ = IN_OUTPUT_DATA;
+ this->u_.in_output_data.output_data = os;
+ this->u_.in_output_data.offset_is_from_end = false;
+ break;
+ case IN_OUTPUT_SEGMENT:
+ case IS_UNDEFINED:
+ default:
+ gold_unreachable();
+ }
+}
+
+// Class Symbol_table.
+
+Symbol_table::Symbol_table(unsigned int count,
+ const Version_script_info& version_script)
+ : saw_undefined_(0), offset_(0), table_(count), namepool_(),
+ forwarders_(), commons_(), tls_commons_(), small_commons_(),
+ large_commons_(), forced_locals_(), warnings_(),
+ version_script_(version_script), gc_(NULL), icf_(NULL)
+{
+ namepool_.reserve(count);
+}
+
+Symbol_table::~Symbol_table()
+{
+}
+
+// The hash function. The key values are Stringpool keys.
+
+inline size_t
+Symbol_table::Symbol_table_hash::operator()(const Symbol_table_key& key) const
+{
+ return key.first ^ key.second;
+}
+
+// The symbol table key equality function. This is called with
+// Stringpool keys.
+
+inline bool
+Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1,
+ const Symbol_table_key& k2) const
+{
+ return k1.first == k2.first && k1.second == k2.second;
+}
+
+bool
+Symbol_table::is_section_folded(Object* obj, unsigned int shndx) const
+{
+ return (parameters->options().icf_enabled()
+ && this->icf_->is_section_folded(obj, shndx));
+}
+
+// For symbols that have been listed with -u option, add them to the
+// work list to avoid gc'ing them.
+
+void
+Symbol_table::gc_mark_undef_symbols()
+{
+ for (options::String_set::const_iterator p =
+ parameters->options().undefined_begin();
+ p != parameters->options().undefined_end();
+ ++p)
+ {
+ const char* name = p->c_str();
+ Symbol* sym = this->lookup(name);
+ gold_assert (sym != NULL);
+ if (sym->source() == Symbol::FROM_OBJECT
+ && !sym->object()->is_dynamic())
+ {
+ Relobj* obj = static_cast<Relobj*>(sym->object());
+ bool is_ordinary;
+ unsigned int shndx = sym->shndx(&is_ordinary);
+ if (is_ordinary)
+ {
+ gold_assert(this->gc_ != NULL);
+ this->gc_->worklist().push(Section_id(obj, shndx));
+ }
+ }
+ }
+}
+
+void
+Symbol_table::gc_mark_symbol_for_shlib(Symbol* sym)
+{
+ if (!sym->is_from_dynobj()
+ && sym->is_externally_visible())
+ {
+ //Add the object and section to the work list.
+ Relobj* obj = static_cast<Relobj*>(sym->object());
+ bool is_ordinary;
+ unsigned int shndx = sym->shndx(&is_ordinary);
+ if (is_ordinary && shndx != elfcpp::SHN_UNDEF)
+ {
+ gold_assert(this->gc_!= NULL);
+ this->gc_->worklist().push(Section_id(obj, shndx));
+ }
+ }
+}
+
+// When doing garbage collection, keep symbols that have been seen in
+// dynamic objects.
+inline void
+Symbol_table::gc_mark_dyn_syms(Symbol* sym)
+{
+ if (sym->in_dyn() && sym->source() == Symbol::FROM_OBJECT
+ && !sym->object()->is_dynamic())
+ {
+ Relobj *obj = static_cast<Relobj*>(sym->object());
+ bool is_ordinary;
+ unsigned int shndx = sym->shndx(&is_ordinary);
+ if (is_ordinary && shndx != elfcpp::SHN_UNDEF)
+ {
+ gold_assert(this->gc_ != NULL);
+ this->gc_->worklist().push(Section_id(obj, shndx));
+ }
+ }
+}
+
+// Make TO a symbol which forwards to FROM.
+
+void
+Symbol_table::make_forwarder(Symbol* from, Symbol* to)
+{
+ gold_assert(from != to);
+ gold_assert(!from->is_forwarder() && !to->is_forwarder());
+ this->forwarders_[from] = to;
+ from->set_forwarder();
+}
+
+// Resolve the forwards from FROM, returning the real symbol.
+
+Symbol*
+Symbol_table::resolve_forwards(const Symbol* from) const
+{
+ gold_assert(from->is_forwarder());
+ Unordered_map<const Symbol*, Symbol*>::const_iterator p =
+ this->forwarders_.find(from);
+ gold_assert(p != this->forwarders_.end());
+ return p->second;
+}
+
+// Look up a symbol by name.
+
+Symbol*
+Symbol_table::lookup(const char* name, const char* version) const
+{
+ Stringpool::Key name_key;
+ name = this->namepool_.find(name, &name_key);
+ if (name == NULL)
+ return NULL;
+
+ Stringpool::Key version_key = 0;
+ if (version != NULL)
+ {
+ version = this->namepool_.find(version, &version_key);
+ if (version == NULL)
+ return NULL;
+ }
+
+ Symbol_table_key key(name_key, version_key);
+ Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key);
+ if (p == this->table_.end())
+ return NULL;
+ return p->second;
+}
+
+// Resolve a Symbol with another Symbol. This is only used in the
+// unusual case where there are references to both an unversioned
+// symbol and a symbol with a version, and we then discover that that
+// version is the default version. Because this is unusual, we do
+// this the slow way, by converting back to an ELF symbol.
+
+template<int size, bool big_endian>
+void
+Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from)
+{
+ unsigned char buf[elfcpp::Elf_sizes<size>::sym_size];
+ elfcpp::Sym_write<size, big_endian> esym(buf);
+ // We don't bother to set the st_name or the st_shndx field.
+ esym.put_st_value(from->value());
+ esym.put_st_size(from->symsize());
+ esym.put_st_info(from->binding(), from->type());
+ esym.put_st_other(from->visibility(), from->nonvis());
+ bool is_ordinary;
+ unsigned int shndx = from->shndx(&is_ordinary);
+ this->resolve(to, esym.sym(), shndx, is_ordinary, shndx, from->object(),
+ from->version());
+ if (from->in_reg())
+ to->set_in_reg();
+ if (from->in_dyn())
+ to->set_in_dyn();
+ if (parameters->options().gc_sections())
+ this->gc_mark_dyn_syms(to);
+}
+
+// Record that a symbol is forced to be local by a version script or
+// by visibility.
+
+void
+Symbol_table::force_local(Symbol* sym)
+{
+ if (!sym->is_defined() && !sym->is_common())
+ return;
+ if (sym->is_forced_local())
+ {
+ // We already got this one.
+ return;
+ }
+ sym->set_is_forced_local();
+ this->forced_locals_.push_back(sym);
+}
+
+// Adjust NAME for wrapping, and update *NAME_KEY if necessary. This
+// is only called for undefined symbols, when at least one --wrap
+// option was used.
+
+const char*
+Symbol_table::wrap_symbol(const char* name, Stringpool::Key* name_key)
+{
+ // For some targets, we need to ignore a specific character when
+ // wrapping, and add it back later.
+ char prefix = '\0';
+ if (name[0] == parameters->target().wrap_char())
+ {
+ prefix = name[0];
+ ++name;
+ }
+
+ if (parameters->options().is_wrap(name))
+ {
+ // Turn NAME into __wrap_NAME.
+ std::string s;
+ if (prefix != '\0')
+ s += prefix;
+ s += "__wrap_";
+ s += name;
+
+ // This will give us both the old and new name in NAMEPOOL_, but
+ // that is OK. Only the versions we need will wind up in the
+ // real string table in the output file.
+ return this->namepool_.add(s.c_str(), true, name_key);
+ }
+
+ const char* const real_prefix = "__real_";
+ const size_t real_prefix_length = strlen(real_prefix);
+ if (strncmp(name, real_prefix, real_prefix_length) == 0
+ && parameters->options().is_wrap(name + real_prefix_length))
+ {
+ // Turn __real_NAME into NAME.
+ std::string s;
+ if (prefix != '\0')
+ s += prefix;
+ s += name + real_prefix_length;
+ return this->namepool_.add(s.c_str(), true, name_key);
+ }
+
+ return name;
+}
+
+// This is called when we see a symbol NAME/VERSION, and the symbol
+// already exists in the symbol table, and VERSION is marked as being
+// the default version. SYM is the NAME/VERSION symbol we just added.
+// DEFAULT_IS_NEW is true if this is the first time we have seen the
+// symbol NAME/NULL. PDEF points to the entry for NAME/NULL.
+
+template<int size, bool big_endian>
+void
+Symbol_table::define_default_version(Sized_symbol<size>* sym,
+ bool default_is_new,
+ Symbol_table_type::iterator pdef)
+{
+ if (default_is_new)
+ {
+ // This is the first time we have seen NAME/NULL. Make
+ // NAME/NULL point to NAME/VERSION, and mark SYM as the default
+ // version.
+ pdef->second = sym;
+ sym->set_is_default();
+ }
+ else if (pdef->second == sym)
+ {
+ // NAME/NULL already points to NAME/VERSION. Don't mark the
+ // symbol as the default if it is not already the default.
+ }
+ else
+ {
+ // This is the unfortunate case where we already have entries
+ // for both NAME/VERSION and NAME/NULL. We now see a symbol
+ // NAME/VERSION where VERSION is the default version. We have
+ // already resolved this new symbol with the existing
+ // NAME/VERSION symbol.
+
+ // It's possible that NAME/NULL and NAME/VERSION are both
+ // defined in regular objects. This can only happen if one
+ // object file defines foo and another defines foo@@ver. This
+ // is somewhat obscure, but we call it a multiple definition
+ // error.
+
+ // It's possible that NAME/NULL actually has a version, in which
+ // case it won't be the same as VERSION. This happens with
+ // ver_test_7.so in the testsuite for the symbol t2_2. We see
+ // t2_2@@VER2, so we define both t2_2/VER2 and t2_2/NULL. We
+ // then see an unadorned t2_2 in an object file and give it
+ // version VER1 from the version script. This looks like a
+ // default definition for VER1, so it looks like we should merge
+ // t2_2/NULL with t2_2/VER1. That doesn't make sense, but it's
+ // not obvious that this is an error, either. So we just punt.
+
+ // If one of the symbols has non-default visibility, and the
+ // other is defined in a shared object, then they are different
+ // symbols.
+
+ // Otherwise, we just resolve the symbols as though they were
+ // the same.
+
+ if (pdef->second->version() != NULL)
+ gold_assert(pdef->second->version() != sym->version());
+ else if (sym->visibility() != elfcpp::STV_DEFAULT
+ && pdef->second->is_from_dynobj())
+ ;
+ else if (pdef->second->visibility() != elfcpp::STV_DEFAULT
+ && sym->is_from_dynobj())
+ ;
+ else
+ {
+ const Sized_symbol<size>* symdef;
+ symdef = this->get_sized_symbol<size>(pdef->second);
+ Symbol_table::resolve<size, big_endian>(sym, symdef);
+ this->make_forwarder(pdef->second, sym);
+ pdef->second = sym;
+ sym->set_is_default();
+ }
+ }
+}
+
+// Add one symbol from OBJECT to the symbol table. NAME is symbol
+// name and VERSION is the version; both are canonicalized. DEF is
+// whether this is the default version. ST_SHNDX is the symbol's
+// section index; IS_ORDINARY is whether this is a normal section
+// rather than a special code.
+
+// If DEF is true, then this is the definition of a default version of
+// a symbol. That means that any lookup of NAME/NULL and any lookup
+// of NAME/VERSION should always return the same symbol. This is
+// obvious for references, but in particular we want to do this for
+// definitions: overriding NAME/NULL should also override
+// NAME/VERSION. If we don't do that, it would be very hard to
+// override functions in a shared library which uses versioning.
+
+// We implement this by simply making both entries in the hash table
+// point to the same Symbol structure. That is easy enough if this is
+// the first time we see NAME/NULL or NAME/VERSION, but it is possible
+// that we have seen both already, in which case they will both have
+// independent entries in the symbol table. We can't simply change
+// the symbol table entry, because we have pointers to the entries
+// attached to the object files. So we mark the entry attached to the
+// object file as a forwarder, and record it in the forwarders_ map.
+// Note that entries in the hash table will never be marked as
+// forwarders.
+//
+// ORIG_ST_SHNDX and ST_SHNDX are almost always the same.
+// ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF
+// for a special section code. ST_SHNDX may be modified if the symbol
+// is defined in a section being discarded.
+
+template<int size, bool big_endian>
+Sized_symbol<size>*
+Symbol_table::add_from_object(Object* object,
+ const char *name,
+ Stringpool::Key name_key,
+ const char *version,
+ Stringpool::Key version_key,
+ bool def,
+ const elfcpp::Sym<size, big_endian>& sym,
+ unsigned int st_shndx,
+ bool is_ordinary,
+ unsigned int orig_st_shndx)
+{
+ // Print a message if this symbol is being traced.
+ if (parameters->options().is_trace_symbol(name))
+ {
+ if (orig_st_shndx == elfcpp::SHN_UNDEF)
+ gold_info(_("%s: reference to %s"), object->name().c_str(), name);
+ else
+ gold_info(_("%s: definition of %s"), object->name().c_str(), name);
+ }
+
+ // For an undefined symbol, we may need to adjust the name using
+ // --wrap.
+ if (orig_st_shndx == elfcpp::SHN_UNDEF
+ && parameters->options().any_wrap())
+ {
+ const char* wrap_name = this->wrap_symbol(name, &name_key);
+ if (wrap_name != name)
+ {
+ // If we see a reference to malloc with version GLIBC_2.0,
+ // and we turn it into a reference to __wrap_malloc, then we
+ // discard the version number. Otherwise the user would be
+ // required to specify the correct version for
+ // __wrap_malloc.
+ version = NULL;
+ version_key = 0;
+ name = wrap_name;
+ }
+ }
+
+ 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));
+
+ std::pair<typename Symbol_table_type::iterator, bool> insdef =
+ std::make_pair(this->table_.end(), false);
+ if (def)
+ {
+ const Stringpool::Key vnull_key = 0;
+ insdef = this->table_.insert(std::make_pair(std::make_pair(name_key,
+ vnull_key),
+ snull));
+ }
+
+ // ins.first: an iterator, which is a pointer to a pair.
+ // ins.first->first: the key (a pair of name and version).
+ // ins.first->second: the value (Symbol*).
+ // ins.second: true if new entry was inserted, false if not.
+
+ Sized_symbol<size>* ret;
+ bool was_undefined;
+ bool was_common;
+ if (!ins.second)
+ {
+ // We already have an entry for NAME/VERSION.
+ ret = this->get_sized_symbol<size>(ins.first->second);
+ gold_assert(ret != NULL);
+
+ was_undefined = ret->is_undefined();
+ was_common = ret->is_common();
+
+ this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object,
+ version);
+ if (parameters->options().gc_sections())
+ this->gc_mark_dyn_syms(ret);
+
+ if (def)
+ this->define_default_version<size, big_endian>(ret, insdef.second,
+ insdef.first);
+ }
+ else
+ {
+ // This is the first time we have seen NAME/VERSION.
+ gold_assert(ins.first->second == NULL);
+
+ if (def && !insdef.second)
+ {
+ // We already have an entry for NAME/NULL. If we override
+ // it, then change it to NAME/VERSION.
+ ret = this->get_sized_symbol<size>(insdef.first->second);
+
+ was_undefined = ret->is_undefined();
+ was_common = ret->is_common();
+
+ this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object,
+ version);
+ if (parameters->options().gc_sections())
+ this->gc_mark_dyn_syms(ret);
+ ins.first->second = ret;
+ }
+ else
+ {
+ was_undefined = false;
+ was_common = false;
+
+ Sized_target<size, big_endian>* target =
+ parameters->sized_target<size, big_endian>();
+ if (!target->has_make_symbol())
+ ret = new Sized_symbol<size>();
+ else
+ {
+ ret = target->make_symbol();
+ if (ret == NULL)
+ {
+ // This means that we don't want a symbol table
+ // entry after all.
+ if (!def)
+ this->table_.erase(ins.first);
+ else
+ {
+ this->table_.erase(insdef.first);
+ // Inserting insdef invalidated ins.
+ this->table_.erase(std::make_pair(name_key,
+ version_key));
+ }
+ return NULL;
+ }
+ }
+
+ ret->init_object(name, version, object, sym, st_shndx, is_ordinary);
+
+ ins.first->second = ret;
+ if (def)
+ {
+ // This is the first time we have seen NAME/NULL. Point
+ // it at the new entry for NAME/VERSION.
+ gold_assert(insdef.second);
+ insdef.first->second = ret;
+ }
+ }
+
+ if (def)
+ ret->set_is_default();
+ }
+
+ // Record every time we see a new undefined symbol, to speed up
+ // archive groups.
+ if (!was_undefined && ret->is_undefined())
+ ++this->saw_undefined_;
+
+ // Keep track of common symbols, to speed up common symbol
+ // allocation.
+ if (!was_common && ret->is_common())
+ {
+ if (ret->type() == elfcpp::STT_TLS)
+ this->tls_commons_.push_back(ret);
+ else if (!is_ordinary
+ && st_shndx == parameters->target().small_common_shndx())
+ this->small_commons_.push_back(ret);
+ else if (!is_ordinary
+ && st_shndx == parameters->target().large_common_shndx())
+ this->large_commons_.push_back(ret);
+ else
+ this->commons_.push_back(ret);
+ }
+
+ // If we're not doing a relocatable link, then any symbol with
+ // hidden or internal visibility is local.
+ if ((ret->visibility() == elfcpp::STV_HIDDEN
+ || ret->visibility() == elfcpp::STV_INTERNAL)
+ && (ret->binding() == elfcpp::STB_GLOBAL
+ || ret->binding() == elfcpp::STB_WEAK)
+ && !parameters->options().relocatable())
+ this->force_local(ret);
+
+ return ret;
+}
+
+// Add all the symbols in a relocatable object to the hash table.
+
+template<int size, bool big_endian>
+void
+Symbol_table::add_from_relobj(
+ Sized_relobj<size, big_endian>* relobj,
+ const unsigned char* syms,
+ size_t count,
+ size_t symndx_offset,
+ const char* sym_names,
+ size_t sym_name_size,
+ typename Sized_relobj<size, big_endian>::Symbols* sympointers,
+ size_t *defined)
+{
+ *defined = 0;
+
+ gold_assert(size == parameters->target().get_size());
+
+ const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
+
+ const bool just_symbols = relobj->just_symbols();
+
+ const unsigned char* p = syms;
+ for (size_t i = 0; i < count; ++i, p += sym_size)
+ {
+ (*sympointers)[i] = NULL;
+
+ elfcpp::Sym<size, big_endian> sym(p);
+
+ unsigned int st_name = sym.get_st_name();
+ if (st_name >= sym_name_size)
+ {
+ relobj->error(_("bad global symbol name offset %u at %zu"),
+ st_name, i);
+ continue;
+ }
+
+ const char* name = sym_names + st_name;
+
+ bool is_ordinary;
+ unsigned int st_shndx = relobj->adjust_sym_shndx(i + symndx_offset,
+ sym.get_st_shndx(),
+ &is_ordinary);
+ unsigned int orig_st_shndx = st_shndx;
+ if (!is_ordinary)
+ orig_st_shndx = elfcpp::SHN_UNDEF;
+
+ if (st_shndx != elfcpp::SHN_UNDEF)
+ ++*defined;
+
+ // A symbol defined in a section which we are not including must
+ // be treated as an undefined symbol.
+ if (st_shndx != elfcpp::SHN_UNDEF
+ && is_ordinary
+ && !relobj->is_section_included(st_shndx))
+ st_shndx = elfcpp::SHN_UNDEF;
+
+ // In an object file, an '@' in the name separates the symbol
+ // name from the version name. If there are two '@' characters,
+ // this is the default version.
+ const char* ver = strchr(name, '@');
+ Stringpool::Key ver_key = 0;
+ int namelen = 0;
+ // DEF: is the version default? LOCAL: is the symbol forced local?
+ bool def = false;
+ bool local = false;
+
+ if (ver != NULL)
+ {
+ // The symbol name is of the form foo@VERSION or foo@@VERSION
+ namelen = ver - name;
+ ++ver;
+ if (*ver == '@')
+ {
+ def = true;
+ ++ver;
+ }
+ ver = this->namepool_.add(ver, true, &ver_key);
+ }
+ // We don't want to assign a version to an undefined symbol,
+ // even if it is listed in the version script. FIXME: What
+ // about a common symbol?
+ else
+ {
+ namelen = strlen(name);
+ if (!this->version_script_.empty()
+ && st_shndx != elfcpp::SHN_UNDEF)
+ {
+ // The symbol name did not have a version, but the
+ // version script may assign a version anyway.
+ std::string version;
+ if (this->version_script_.get_symbol_version(name, &version))
+ {
+ // The version can be empty if the version script is
+ // only used to force some symbols to be local.
+ if (!version.empty())
+ {
+ ver = this->namepool_.add_with_length(version.c_str(),
+ version.length(),
+ true,
+ &ver_key);
+ def = true;
+ }
+ }
+ else if (this->version_script_.symbol_is_local(name))
+ local = true;
+ }
+ }
+
+ elfcpp::Sym<size, big_endian>* psym = &sym;
+ unsigned char symbuf[sym_size];
+ elfcpp::Sym<size, big_endian> sym2(symbuf);
+ if (just_symbols)
+ {
+ memcpy(symbuf, p, sym_size);
+ elfcpp::Sym_write<size, big_endian> sw(symbuf);
+ if (orig_st_shndx != elfcpp::SHN_UNDEF && is_ordinary)
+ {
+ // Symbol values in object files are section relative.
+ // This is normally what we want, but since here we are
+ // converting the symbol to absolute we need to add the
+ // section address. The section address in an object
+ // file is normally zero, but people can use a linker
+ // script to change it.
+ sw.put_st_value(sym.get_st_value()
+ + relobj->section_address(orig_st_shndx));
+ }
+ st_shndx = elfcpp::SHN_ABS;
+ is_ordinary = false;
+ psym = &sym2;
+ }
+
+ // Fix up visibility if object has no-export set.
+ if (relobj->no_export())
+ {
+ // We may have copied symbol already above.
+ if (psym != &sym2)
+ {
+ memcpy(symbuf, p, sym_size);
+ psym = &sym2;
+ }
+
+ elfcpp::STV visibility = sym2.get_st_visibility();
+ if (visibility == elfcpp::STV_DEFAULT
+ || visibility == elfcpp::STV_PROTECTED)
+ {
+ elfcpp::Sym_write<size, big_endian> sw(symbuf);
+ unsigned char nonvis = sym2.get_st_nonvis();
+ sw.put_st_other(elfcpp::STV_HIDDEN, nonvis);
+ }
+ }
+
+ Stringpool::Key name_key;
+ name = this->namepool_.add_with_length(name, namelen, true,
+ &name_key);
+
+ Sized_symbol<size>* res;
+ res = this->add_from_object(relobj, name, name_key, ver, ver_key,
+ def, *psym, st_shndx, is_ordinary,
+ orig_st_shndx);
+
+ // If building a shared library using garbage collection, do not
+ // treat externally visible symbols as garbage.
+ if (parameters->options().gc_sections()
+ && parameters->options().shared())
+ this->gc_mark_symbol_for_shlib(res);
+
+ if (local)
+ this->force_local(res);
+
+ (*sympointers)[i] = res;
+ }
+}
+
+// Add a symbol from a plugin-claimed file.
+
+template<int size, bool big_endian>
+Symbol*
+Symbol_table::add_from_pluginobj(
+ Sized_pluginobj<size, big_endian>* obj,
+ const char* name,
+ const char* ver,
+ elfcpp::Sym<size, big_endian>* sym)
+{
+ unsigned int st_shndx = sym->get_st_shndx();
+
+ Stringpool::Key ver_key = 0;
+ bool def = false;
+ bool local = false;
+
+ if (ver != NULL)
+ {
+ ver = this->namepool_.add(ver, true, &ver_key);
+ }
+ // We don't want to assign a version to an undefined symbol,
+ // even if it is listed in the version script. FIXME: What
+ // about a common symbol?
+ else
+ {
+ if (!this->version_script_.empty()
+ && st_shndx != elfcpp::SHN_UNDEF)
+ {
+ // The symbol name did not have a version, but the
+ // version script may assign a version anyway.
+ std::string version;
+ if (this->version_script_.get_symbol_version(name, &version))
+ {
+ // The version can be empty if the version script is
+ // only used to force some symbols to be local.
+ if (!version.empty())
+ {
+ ver = this->namepool_.add_with_length(version.c_str(),
+ version.length(),
+ true,
+ &ver_key);
+ def = true;
+ }
+ }
+ else if (this->version_script_.symbol_is_local(name))
+ local = true;
+ }
+ }
+
+ Stringpool::Key name_key;
+ name = this->namepool_.add(name, true, &name_key);
+
+ Sized_symbol<size>* res;
+ res = this->add_from_object(obj, name, name_key, ver, ver_key,
+ def, *sym, st_shndx, true, st_shndx);
+
+ if (local)
+ this->force_local(res);
+
+ return res;
+}
+
+// Add all the symbols in a dynamic object to the hash table.
+
+template<int size, bool big_endian>
+void
+Symbol_table::add_from_dynobj(
+ Sized_dynobj<size, big_endian>* 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,
+ typename Sized_relobj<size, big_endian>::Symbols* sympointers,
+ size_t* defined)
+{
+ *defined = 0;
+
+ gold_assert(size == parameters->target().get_size());
+
+ if (dynobj->just_symbols())
+ {
+ gold_error(_("--just-symbols does not make sense with a shared object"));
+ return;
+ }
+
+ if (versym != NULL && versym_size / 2 < count)
+ {
+ dynobj->error(_("too few symbol versions"));
+ return;
+ }
+
+ const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
+
+ // We keep a list of all STT_OBJECT symbols, so that we can resolve
+ // weak aliases. This is necessary because if the dynamic object
+ // provides the same variable under two names, one of which is a
+ // weak definition, and the regular object refers to the weak
+ // definition, we have to put both the weak definition and the
+ // strong definition into the dynamic symbol table. Given a weak
+ // definition, the only way that we can find the corresponding
+ // strong definition, if any, is to search the symbol table.
+ std::vector<Sized_symbol<size>*> object_symbols;
+
+ const unsigned char* p = syms;
+ const unsigned char* vs = versym;
+ for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2)
+ {
+ elfcpp::Sym<size, big_endian> sym(p);
+
+ if (sympointers != NULL)
+ (*sympointers)[i] = NULL;
+
+ // Ignore symbols with local binding or that have
+ // internal or hidden visibility.
+ if (sym.get_st_bind() == elfcpp::STB_LOCAL
+ || sym.get_st_visibility() == elfcpp::STV_INTERNAL
+ || sym.get_st_visibility() == elfcpp::STV_HIDDEN)
+ continue;
+
+ // A protected symbol in a shared library must be treated as a
+ // normal symbol when viewed from outside the shared library.
+ // Implement this by overriding the visibility here.
+ elfcpp::Sym<size, big_endian>* psym = &sym;
+ unsigned char symbuf[sym_size];
+ elfcpp::Sym<size, big_endian> sym2(symbuf);
+ if (sym.get_st_visibility() == elfcpp::STV_PROTECTED)
+ {
+ memcpy(symbuf, p, sym_size);
+ elfcpp::Sym_write<size, big_endian> sw(symbuf);
+ sw.put_st_other(elfcpp::STV_DEFAULT, sym.get_st_nonvis());
+ psym = &sym2;
+ }
+
+ unsigned int st_name = psym->get_st_name();
+ if (st_name >= sym_name_size)
+ {
+ dynobj->error(_("bad symbol name offset %u at %zu"),
+ st_name, i);
+ continue;
+ }
+
+ const char* name = sym_names + st_name;
+
+ bool is_ordinary;
+ unsigned int st_shndx = dynobj->adjust_sym_shndx(i, psym->get_st_shndx(),
+ &is_ordinary);
+
+ if (st_shndx != elfcpp::SHN_UNDEF)
+ ++*defined;
+
+ Sized_symbol<size>* res;
+
+ if (versym == NULL)
+ {
+ Stringpool::Key name_key;
+ name = this->namepool_.add(name, true, &name_key);
+ res = this->add_from_object(dynobj, name, name_key, NULL, 0,
+ false, *psym, st_shndx, is_ordinary,
+ st_shndx);
+ }
+ else
+ {
+ // Read the version information.
+
+ unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs);
+
+ bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0;
+ v &= elfcpp::VERSYM_VERSION;
+
+ // The Sun documentation says that V can be VER_NDX_LOCAL,
+ // or VER_NDX_GLOBAL, or a version index. The meaning of
+ // VER_NDX_LOCAL is defined as "Symbol has local scope."
+ // The old GNU linker will happily generate VER_NDX_LOCAL
+ // for an undefined symbol. I don't know what the Sun
+ // linker will generate.
+
+ if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL)
+ && st_shndx != elfcpp::SHN_UNDEF)
+ {
+ // This symbol should not be visible outside the object.
+ continue;
+ }
+
+ // At this point we are definitely going to add this symbol.
+ Stringpool::Key name_key;
+ name = this->namepool_.add(name, true, &name_key);
+
+ if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL)
+ || v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL))
+ {
+ // This symbol does not have a version.
+ res = this->add_from_object(dynobj, name, name_key, NULL, 0,
+ false, *psym, st_shndx, is_ordinary,
+ st_shndx);
+ }
+ else
+ {
+ if (v >= version_map->size())
+ {
+ dynobj->error(_("versym for symbol %zu out of range: %u"),
+ i, v);
+ continue;
+ }
+
+ const char* version = (*version_map)[v];
+ if (version == NULL)
+ {
+ dynobj->error(_("versym for symbol %zu has no name: %u"),
+ i, v);
+ continue;
+ }
+
+ Stringpool::Key version_key;
+ version = this->namepool_.add(version, true, &version_key);
+
+ // If this is an absolute symbol, and the version name
+ // and symbol name are the same, then this is the
+ // version definition symbol. These symbols exist to
+ // support using -u to pull in particular versions. We
+ // do not want to record a version for them.
+ if (st_shndx == elfcpp::SHN_ABS
+ && !is_ordinary
+ && name_key == version_key)
+ res = this->add_from_object(dynobj, name, name_key, NULL, 0,
+ false, *psym, st_shndx, is_ordinary,
+ st_shndx);
+ else
+ {
+ const bool def = (!hidden
+ && st_shndx != elfcpp::SHN_UNDEF);
+ res = this->add_from_object(dynobj, name, name_key, version,
+ version_key, def, *psym, st_shndx,
+ is_ordinary, st_shndx);
+ }
+ }
+ }
+
+ // Note that it is possible that RES was overridden by an
+ // earlier object, in which case it can't be aliased here.
+ if (st_shndx != elfcpp::SHN_UNDEF
+ && is_ordinary
+ && psym->get_st_type() == elfcpp::STT_OBJECT
+ && res->source() == Symbol::FROM_OBJECT
+ && res->object() == dynobj)
+ object_symbols.push_back(res);
+
+ if (sympointers != NULL)
+ (*sympointers)[i] = res;
+ }
+
+ this->record_weak_aliases(&object_symbols);
+}
+
+// This is used to sort weak aliases. We sort them first by section
+// index, then by offset, then by weak ahead of strong.
+
+template<int size>
+class Weak_alias_sorter
+{
+ public:
+ bool operator()(const Sized_symbol<size>*, const Sized_symbol<size>*) const;
+};
+
+template<int size>
+bool
+Weak_alias_sorter<size>::operator()(const Sized_symbol<size>* s1,
+ const Sized_symbol<size>* s2) const
+{
+ bool is_ordinary;
+ unsigned int s1_shndx = s1->shndx(&is_ordinary);
+ gold_assert(is_ordinary);
+ unsigned int s2_shndx = s2->shndx(&is_ordinary);
+ gold_assert(is_ordinary);
+ if (s1_shndx != s2_shndx)
+ return s1_shndx < s2_shndx;
+
+ if (s1->value() != s2->value())
+ return s1->value() < s2->value();
+ if (s1->binding() != s2->binding())
+ {
+ if (s1->binding() == elfcpp::STB_WEAK)
+ return true;
+ if (s2->binding() == elfcpp::STB_WEAK)
+ return false;
+ }
+ return std::string(s1->name()) < std::string(s2->name());
+}
+
+// SYMBOLS is a list of object symbols from a dynamic object. Look
+// for any weak aliases, and record them so that if we add the weak
+// alias to the dynamic symbol table, we also add the corresponding
+// strong symbol.
+
+template<int size>
+void
+Symbol_table::record_weak_aliases(std::vector<Sized_symbol<size>*>* symbols)
+{
+ // Sort the vector by section index, then by offset, then by weak
+ // ahead of strong.
+ std::sort(symbols->begin(), symbols->end(), Weak_alias_sorter<size>());
+
+ // Walk through the vector. For each weak definition, record
+ // aliases.
+ for (typename std::vector<Sized_symbol<size>*>::const_iterator p =
+ symbols->begin();
+ p != symbols->end();
+ ++p)
+ {
+ if ((*p)->binding() != elfcpp::STB_WEAK)
+ continue;
+
+ // Build a circular list of weak aliases. Each symbol points to
+ // the next one in the circular list.
+
+ Sized_symbol<size>* from_sym = *p;
+ typename std::vector<Sized_symbol<size>*>::const_iterator q;
+ for (q = p + 1; q != symbols->end(); ++q)
+ {
+ bool dummy;
+ if ((*q)->shndx(&dummy) != from_sym->shndx(&dummy)
+ || (*q)->value() != from_sym->value())
+ break;
+
+ 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 sets *RESOLVE_OLDSYM if we should
+// resolve the newly created symbol to the old one. This
+// canonicalizes *PNAME and *PVERSION.
+
+template<int size, bool big_endian>
+Sized_symbol<size>*
+Symbol_table::define_special_symbol(const char** pname, const char** pversion,
+ bool only_if_ref,
+ Sized_symbol<size>** poldsym,
+ bool *resolve_oldsym)
+{
+ *resolve_oldsym = false;
+
+ // If the caller didn't give us a version, see if we get one from
+ // the version script.
+ std::string v;
+ bool is_default_version = false;
+ if (*pversion == NULL)
+ {
+ if (this->version_script_.get_symbol_version(*pname, &v))
+ {
+ if (!v.empty())
+ *pversion = v.c_str();
+
+ // If we get the version from a version script, then we are
+ // also the default version.
+ is_default_version = true;
+ }
+ }
+
+ Symbol* oldsym;
+ Sized_symbol<size>* sym;
+
+ bool add_to_table = false;
+ typename Symbol_table_type::iterator add_loc = this->table_.end();
+ bool add_def_to_table = false;
+ typename Symbol_table_type::iterator add_def_loc = this->table_.end();
+
+ if (only_if_ref)
+ {
+ oldsym = this->lookup(*pname, *pversion);
+ if (oldsym == NULL && is_default_version)
+ oldsym = this->lookup(*pname, NULL);
+ if (oldsym == NULL || !oldsym->is_undefined())
+ return NULL;
+
+ *pname = oldsym->name();
+ if (!is_default_version)
+ *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));
+
+ std::pair<typename Symbol_table_type::iterator, bool> insdef =
+ std::make_pair(this->table_.end(), false);
+ if (is_default_version)
+ {
+ const Stringpool::Key vnull = 0;
+ insdef = this->table_.insert(std::make_pair(std::make_pair(name_key,
+ vnull),
+ snull));
+ }
+
+ if (!ins.second)
+ {
+ // We already have a symbol table entry for NAME/VERSION.
+ oldsym = ins.first->second;
+ gold_assert(oldsym != NULL);
+
+ if (is_default_version)
+ {
+ Sized_symbol<size>* soldsym =
+ this->get_sized_symbol<size>(oldsym);
+ this->define_default_version<size, big_endian>(soldsym,
+ insdef.second,
+ insdef.first);
+ }
+ }
+ else
+ {
+ // We haven't seen this symbol before.
+ gold_assert(ins.first->second == NULL);
+
+ add_to_table = true;
+ add_loc = ins.first;
+
+ if (is_default_version && !insdef.second)
+ {
+ // We are adding NAME/VERSION, and it is the default
+ // version. We already have an entry for NAME/NULL.
+ oldsym = insdef.first->second;
+ *resolve_oldsym = true;
+ }
+ else
+ {
+ oldsym = NULL;
+
+ if (is_default_version)
+ {
+ add_def_to_table = true;
+ add_def_loc = insdef.first;
+ }
+ }
+ }
+ }
+
+ const Target& target = parameters->target();
+ if (!target.has_make_symbol())
+ sym = new Sized_symbol<size>();
+ else
+ {
+ Sized_target<size, big_endian>* sized_target =
+ parameters->sized_target<size, big_endian>();
+ sym = sized_target->make_symbol();
+ if (sym == NULL)
+ return NULL;
+ }
+
+ if (add_to_table)
+ add_loc->second = sym;
+ else
+ gold_assert(oldsym != NULL);
+
+ if (add_def_to_table)
+ add_def_loc->second = sym;
+
+ *poldsym = this->get_sized_symbol<size>(oldsym);
+
+ return sym;
+}
+
+// Define a symbol based on an Output_data.
+
+Symbol*
+Symbol_table::define_in_output_data(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->target().get_size() == 32)
+ {
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+ return this->do_define_in_output_data<32>(name, version, od,
+ value, symsize, type, binding,
+ visibility, nonvis,
+ offset_is_from_end,
+ only_if_ref);
+#else
+ gold_unreachable();
+#endif
+ }
+ else if (parameters->target().get_size() == 64)
+ {
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+ return this->do_define_in_output_data<64>(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 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;
+ bool resolve_oldsym;
+
+ if (parameters->target().is_big_endian())
+ {
+#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
+ sym = this->define_special_symbol<size, true>(&name, &version,
+ only_if_ref, &oldsym,
+ &resolve_oldsym);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
+ sym = this->define_special_symbol<size, false>(&name, &version,
+ only_if_ref, &oldsym,
+ &resolve_oldsym);
+#else
+ gold_unreachable();
+#endif
+ }
+
+ if (sym == NULL)
+ return NULL;
+
+ sym->init_output_data(name, version, 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);
+ else if (version != NULL)
+ sym->set_is_default();
+ return sym;
+ }
+
+ if (Symbol_table::should_override_with_special(oldsym))
+ this->override_with_special(oldsym, sym);
+
+ if (resolve_oldsym)
+ return sym;
+ else
+ {
+ delete sym;
+ return oldsym;
+ }
+}
+
+// Define a symbol based on an Output_segment.
+
+Symbol*
+Symbol_table::define_in_output_segment(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->target().get_size() == 32)
+ {
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+ return this->do_define_in_output_segment<32>(name, version, os,
+ value, symsize, type,
+ binding, visibility, nonvis,
+ offset_base, only_if_ref);
+#else
+ gold_unreachable();
+#endif
+ }
+ else if (parameters->target().get_size() == 64)
+ {
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+ return this->do_define_in_output_segment<64>(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 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;
+ bool resolve_oldsym;
+
+ if (parameters->target().is_big_endian())
+ {
+#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
+ sym = this->define_special_symbol<size, true>(&name, &version,
+ only_if_ref, &oldsym,
+ &resolve_oldsym);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
+ sym = this->define_special_symbol<size, false>(&name, &version,
+ only_if_ref, &oldsym,
+ &resolve_oldsym);
+#else
+ gold_unreachable();
+#endif
+ }
+
+ if (sym == NULL)
+ return NULL;
+
+ sym->init_output_segment(name, version, 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);
+ else if (version != NULL)
+ sym->set_is_default();
+ return sym;
+ }
+
+ if (Symbol_table::should_override_with_special(oldsym))
+ this->override_with_special(oldsym, sym);
+
+ if (resolve_oldsym)
+ return sym;
+ else
+ {
+ 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 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,
+ bool force_override)
+{
+ if (parameters->target().get_size() == 32)
+ {
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+ return this->do_define_as_constant<32>(name, version, value,
+ symsize, type, binding,
+ visibility, nonvis, only_if_ref,
+ force_override);
+#else
+ gold_unreachable();
+#endif
+ }
+ else if (parameters->target().get_size() == 64)
+ {
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+ return this->do_define_as_constant<64>(name, version, value,
+ symsize, type, binding,
+ visibility, nonvis, only_if_ref,
+ force_override);
+#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 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,
+ bool force_override)
+{
+ Sized_symbol<size>* sym;
+ Sized_symbol<size>* oldsym;
+ bool resolve_oldsym;
+
+ if (parameters->target().is_big_endian())
+ {
+#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
+ sym = this->define_special_symbol<size, true>(&name, &version,
+ only_if_ref, &oldsym,
+ &resolve_oldsym);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
+ sym = this->define_special_symbol<size, false>(&name, &version,
+ only_if_ref, &oldsym,
+ &resolve_oldsym);
+#else
+ gold_unreachable();
+#endif
+ }
+
+ if (sym == NULL)
+ return NULL;
+
+ sym->init_constant(name, version, value, symsize, type, binding, visibility,
+ nonvis);
+
+ if (oldsym == NULL)
+ {
+ // Version symbols are absolute symbols with name == version.
+ // We don't want to force them to be local.
+ if ((version == NULL
+ || name != version
+ || value != 0)
+ && (binding == elfcpp::STB_LOCAL
+ || this->version_script_.symbol_is_local(name)))
+ this->force_local(sym);
+ else if (version != NULL
+ && (name != version || value != 0))
+ sym->set_is_default();
+ return sym;
+ }
+
+ if (force_override || Symbol_table::should_override_with_special(oldsym))
+ this->override_with_special(oldsym, sym);
+
+ if (resolve_oldsym)
+ return sym;
+ else
+ {
+ delete sym;
+ return oldsym;
+ }
+}
+
+// Define a set of symbols in output sections.
+
+void
+Symbol_table::define_symbols(const Layout* layout, int count,
+ const Define_symbol_in_section* p,
+ bool only_if_ref)
+{
+ 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(p->name, NULL, os, p->value,
+ p->size, p->type, p->binding,
+ p->visibility, p->nonvis,
+ p->offset_is_from_end,
+ only_if_ref || p->only_if_ref);
+ else
+ this->define_as_constant(p->name, NULL, 0, p->size, p->type,
+ p->binding, p->visibility, p->nonvis,
+ only_if_ref || p->only_if_ref,
+ false);
+ }
+}
+
+// Define a set of symbols in output segments.
+
+void
+Symbol_table::define_symbols(const Layout* layout, int count,
+ const Define_symbol_in_segment* p,
+ bool only_if_ref)
+{
+ 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(p->name, NULL, os, p->value,
+ p->size, p->type, p->binding,
+ p->visibility, p->nonvis,
+ p->offset_base,
+ only_if_ref || p->only_if_ref);
+ else
+ this->define_as_constant(p->name, NULL, 0, p->size, p->type,
+ p->binding, p->visibility, p->nonvis,
+ only_if_ref || p->only_if_ref,
+ false);
+ }
+}
+
+// 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(
+ 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(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;
+}
+
+// Add any undefined symbols named on the command line.
+
+void
+Symbol_table::add_undefined_symbols_from_command_line()
+{
+ if (parameters->options().any_undefined())
+ {
+ if (parameters->target().get_size() == 32)
+ {
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+ this->do_add_undefined_symbols_from_command_line<32>();
+#else
+ gold_unreachable();
+#endif
+ }
+ else if (parameters->target().get_size() == 64)
+ {
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+ this->do_add_undefined_symbols_from_command_line<64>();
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ gold_unreachable();
+ }
+}
+
+template<int size>
+void
+Symbol_table::do_add_undefined_symbols_from_command_line()
+{
+ for (options::String_set::const_iterator p =
+ parameters->options().undefined_begin();
+ p != parameters->options().undefined_end();
+ ++p)
+ {
+ const char* name = p->c_str();
+
+ if (this->lookup(name) != NULL)
+ continue;
+
+ const char* version = NULL;
+
+ Sized_symbol<size>* sym;
+ Sized_symbol<size>* oldsym;
+ bool resolve_oldsym;
+ if (parameters->target().is_big_endian())
+ {
+#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
+ sym = this->define_special_symbol<size, true>(&name, &version,
+ false, &oldsym,
+ &resolve_oldsym);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
+ sym = this->define_special_symbol<size, false>(&name, &version,
+ false, &oldsym,
+ &resolve_oldsym);
+#else
+ gold_unreachable();
+#endif
+ }
+
+ gold_assert(oldsym == NULL);
+
+ sym->init_undefined(name, version, elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
+ elfcpp::STV_DEFAULT, 0);
+ ++this->saw_undefined_;
+ }
+}
+
+// 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(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(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->target().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->target().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;
+}
+
+// Compute the final value of SYM and store status in location PSTATUS.
+// During relaxation, this may be called multiple times for a symbol to
+// compute its would-be final value in each relaxation pass.
+
+template<int size>
+typename Sized_symbol<size>::Value_type
+Symbol_table::compute_final_value(
+ const Sized_symbol<size>* sym,
+ Compute_final_value_status* pstatus) const
+{
+ typedef typename Sized_symbol<size>::Value_type Value_type;
+ Value_type value;
+
+ switch (sym->source())
+ {
+ case Symbol::FROM_OBJECT:
+ {
+ bool is_ordinary;
+ unsigned int shndx = sym->shndx(&is_ordinary);
+
+ if (!is_ordinary
+ && shndx != elfcpp::SHN_ABS
+ && !Symbol::is_common_shndx(shndx))
+ {
+ *pstatus = CFVS_UNSUPPORTED_SYMBOL_SECTION;
+ return 0;
+ }
+
+ Object* symobj = sym->object();
+ if (symobj->is_dynamic())
+ {
+ value = 0;
+ shndx = elfcpp::SHN_UNDEF;
+ }
+ else if (symobj->pluginobj() != NULL)
+ {
+ value = 0;
+ shndx = elfcpp::SHN_UNDEF;
+ }
+ else if (shndx == elfcpp::SHN_UNDEF)
+ value = 0;
+ else if (!is_ordinary
+ && (shndx == elfcpp::SHN_ABS
+ || Symbol::is_common_shndx(shndx)))
+ value = sym->value();
+ else
+ {
+ Relobj* relobj = static_cast<Relobj*>(symobj);
+ Output_section* os = relobj->output_section(shndx);
+ uint64_t secoff64 = relobj->output_section_offset(shndx);
+
+ if (this->is_section_folded(relobj, shndx))
+ {
+ gold_assert(os == NULL);
+ // Get the os of the section it is folded onto.
+ Section_id folded = this->icf_->get_folded_section(relobj,
+ shndx);
+ gold_assert(folded.first != NULL);
+ Relobj* folded_obj = reinterpret_cast<Relobj*>(folded.first);
+ os = folded_obj->output_section(folded.second);
+ gold_assert(os != NULL);
+ secoff64 = folded_obj->output_section_offset(folded.second);
+ }
+
+ if (os == NULL)
+ {
+ bool static_or_reloc = (parameters->doing_static_link() ||
+ parameters->options().relocatable());
+ gold_assert(static_or_reloc || sym->dynsym_index() == -1U);
+
+ *pstatus = CFVS_NO_OUTPUT_SECTION;
+ return 0;
+ }
+
+ if (secoff64 == -1ULL)
+ {
+ // The section needs special handling (e.g., a merge section).
+
+ value = os->output_address(relobj, shndx, sym->value());
+ }
+ else
+ {
+ Value_type secoff =
+ convert_types<Value_type, uint64_t>(secoff64);
+ 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();
+ if (sym->type() != elfcpp::STT_TLS)
+ value += od->address();
+ else
+ {
+ Output_section* os = od->output_section();
+ gold_assert(os != NULL);
+ value += os->tls_offset() + (od->address() - os->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();
+ if (sym->type() != elfcpp::STT_TLS)
+ 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::IS_CONSTANT:
+ value = sym->value();
+ break;
+
+ case Symbol::IS_UNDEFINED:
+ value = 0;
+ break;
+
+ default:
+ gold_unreachable();
+ }
+
+ *pstatus = CFVS_OK;
+ return value;
+}
+
+// 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)
+{
+ typedef typename Sized_symbol<size>::Value_type Value_type;
+
+ 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;
+ }
+
+ // Compute final symbol value.
+ Compute_final_value_status status;
+ Value_type value = this->compute_final_value(sym, &status);
+
+ switch (status)
+ {
+ case CFVS_OK:
+ break;
+ case CFVS_UNSUPPORTED_SYMBOL_SECTION:
+ {
+ bool is_ordinary;
+ unsigned int shndx = sym->shndx(&is_ordinary);
+ gold_error(_("%s: unsupported symbol section 0x%x"),
+ sym->demangled_name().c_str(), shndx);
+ }
+ break;
+ case CFVS_NO_OUTPUT_SECTION:
+ sym->set_symtab_index(-1U);
+ return false;
+ default:
+ gold_unreachable();
+ }
+
+ sym->set_value(value);
+
+ if (parameters->options().strip_all()
+ || !parameters->options().should_retain_symbol(sym->name()))
+ {
+ sym->set_symtab_index(-1U);
+ return false;
+ }
+
+ return true;
+}
+
+// Write out the global symbols.
+
+void
+Symbol_table::write_globals(const Stringpool* sympool,
+ const Stringpool* dynpool,
+ Output_symtab_xindex* symtab_xindex,
+ Output_symtab_xindex* dynsym_xindex,
+ Output_file* of) const
+{
+ switch (parameters->size_and_endianness())
+ {
+#ifdef HAVE_TARGET_32_LITTLE
+ case Parameters::TARGET_32_LITTLE:
+ this->sized_write_globals<32, false>(sympool, dynpool, symtab_xindex,
+ dynsym_xindex, of);
+ break;
+#endif
+#ifdef HAVE_TARGET_32_BIG
+ case Parameters::TARGET_32_BIG:
+ this->sized_write_globals<32, true>(sympool, dynpool, symtab_xindex,
+ dynsym_xindex, of);
+ break;
+#endif
+#ifdef HAVE_TARGET_64_LITTLE
+ case Parameters::TARGET_64_LITTLE:
+ this->sized_write_globals<64, false>(sympool, dynpool, symtab_xindex,
+ dynsym_xindex, of);
+ break;
+#endif
+#ifdef HAVE_TARGET_64_BIG
+ case Parameters::TARGET_64_BIG:
+ this->sized_write_globals<64, true>(sympool, dynpool, symtab_xindex,
+ dynsym_xindex, of);
+ break;
+#endif
+ default:
+ gold_unreachable();
+ }
+}
+
+// Write out the global symbols.
+
+template<int size, bool big_endian>
+void
+Symbol_table::sized_write_globals(const Stringpool* sympool,
+ const Stringpool* dynpool,
+ Output_symtab_xindex* symtab_xindex,
+ Output_symtab_xindex* dynsym_xindex,
+ Output_file* of) const
+{
+ const Target& target = parameters->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* psyms;
+ if (this->offset_ == 0 || output_count == 0)
+ psyms = NULL;
+ else
+ 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_count == 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(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<size>::Elf_Addr sym_value = sym->value();
+ typename elfcpp::Elf_types<size>::Elf_Addr dynsym_value = sym_value;
+ switch (sym->source())
+ {
+ case Symbol::FROM_OBJECT:
+ {
+ bool is_ordinary;
+ unsigned int in_shndx = sym->shndx(&is_ordinary);
+
+ if (!is_ordinary
+ && in_shndx != elfcpp::SHN_ABS
+ && !Symbol::is_common_shndx(in_shndx))
+ {
+ 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())
+ dynsym_value = target.dynsym_value(sym);
+ shndx = elfcpp::SHN_UNDEF;
+ }
+ else if (symobj->pluginobj() != NULL)
+ shndx = elfcpp::SHN_UNDEF;
+ else if (in_shndx == elfcpp::SHN_UNDEF
+ || (!is_ordinary
+ && (in_shndx == elfcpp::SHN_ABS
+ || Symbol::is_common_shndx(in_shndx))))
+ shndx = in_shndx;
+ else
+ {
+ Relobj* relobj = static_cast<Relobj*>(symobj);
+ Output_section* os = relobj->output_section(in_shndx);
+ if (this->is_section_folded(relobj, in_shndx))
+ {
+ // This global symbol must be written out even though
+ // it is folded.
+ // Get the os of the section it is folded onto.
+ Section_id folded =
+ this->icf_->get_folded_section(relobj, in_shndx);
+ gold_assert(folded.first !=NULL);
+ Relobj* folded_obj =
+ reinterpret_cast<Relobj*>(folded.first);
+ os = folded_obj->output_section(folded.second);
+ gold_assert(os != NULL);
+ }
+ gold_assert(os != NULL);
+ shndx = os->out_shndx();
+
+ if (shndx >= elfcpp::SHN_LORESERVE)
+ {
+ if (sym_index != -1U)
+ symtab_xindex->add(sym_index, shndx);
+ if (dynsym_index != -1U)
+ dynsym_xindex->add(dynsym_index, shndx);
+ shndx = elfcpp::SHN_XINDEX;
+ }
+
+ // In object files symbol values are section
+ // relative.
+ if (parameters->options().relocatable())
+ sym_value -= os->address();
+ }
+ }
+ }
+ break;
+
+ case Symbol::IN_OUTPUT_DATA:
+ shndx = sym->output_data()->out_shndx();
+ if (shndx >= elfcpp::SHN_LORESERVE)
+ {
+ if (sym_index != -1U)
+ symtab_xindex->add(sym_index, shndx);
+ if (dynsym_index != -1U)
+ dynsym_xindex->add(dynsym_index, shndx);
+ shndx = elfcpp::SHN_XINDEX;
+ }
+ break;
+
+ case Symbol::IN_OUTPUT_SEGMENT:
+ shndx = elfcpp::SHN_ABS;
+ break;
+
+ case Symbol::IS_CONSTANT:
+ shndx = elfcpp::SHN_ABS;
+ break;
+
+ case Symbol::IS_UNDEFINED:
+ shndx = elfcpp::SHN_UNDEF;
+ 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<size, big_endian>(sym, sym_value, shndx,
+ sympool, ps);
+ }
+
+ 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<size, big_endian>(sym, dynsym_value, shndx,
+ dynpool, pd);
+ }
+ }
+
+ 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) const
+{
+ elfcpp::Sym_write<size, big_endian> osym(p);
+ osym.put_st_name(pool->get_offset(sym->name()));
+ osym.put_st_value(value);
+ // Use a symbol size of zero for undefined symbols from shared libraries.
+ if (shndx == elfcpp::SHN_UNDEF && sym->is_from_dynobj())
+ osym.put_st_size(0);
+ else
+ 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 a system library
+// directory (e.g., /lib or /usr/lib); we assume that those libraries
+// are OK. This heuristic avoids problems on GNU/Linux, in which -ldl
+// can have undefined references satisfied by ld-linux.so.
+
+inline void
+Symbol_table::warn_about_undefined_dynobj_symbol(Symbol* sym) const
+{
+ bool dummy;
+ if (sym->source() == Symbol::FROM_OBJECT
+ && sym->object()->is_dynamic()
+ && sym->shndx(&dummy) == elfcpp::SHN_UNDEF
+ && sym->binding() != elfcpp::STB_WEAK
+ && !parameters->options().allow_shlib_undefined()
+ && !parameters->target().is_defined_by_abi(sym)
+ && !sym->object()->is_in_system_directory())
+ {
+ // A very ugly cast.
+ Dynobj* dynobj = static_cast<Dynobj*>(sym->object());
+ if (!dynobj->has_unknown_needed_entries())
+ gold_undefined_symbol(sym);
+ }
+}
+
+// Write out a section symbol. Return the update offset.
+
+void
+Symbol_table::write_section_symbol(const Output_section *os,
+ Output_symtab_xindex* symtab_xindex,
+ Output_file* of,
+ off_t offset) const
+{
+ switch (parameters->size_and_endianness())
+ {
+#ifdef HAVE_TARGET_32_LITTLE
+ case Parameters::TARGET_32_LITTLE:
+ this->sized_write_section_symbol<32, false>(os, symtab_xindex, of,
+ offset);
+ break;
+#endif
+#ifdef HAVE_TARGET_32_BIG
+ case Parameters::TARGET_32_BIG:
+ this->sized_write_section_symbol<32, true>(os, symtab_xindex, of,
+ offset);
+ break;
+#endif
+#ifdef HAVE_TARGET_64_LITTLE
+ case Parameters::TARGET_64_LITTLE:
+ this->sized_write_section_symbol<64, false>(os, symtab_xindex, of,
+ offset);
+ break;
+#endif
+#ifdef HAVE_TARGET_64_BIG
+ case Parameters::TARGET_64_BIG:
+ this->sized_write_section_symbol<64, true>(os, symtab_xindex, of,
+ offset);
+ break;
+#endif
+ default:
+ 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_symtab_xindex* symtab_xindex,
+ 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);
+ if (parameters->options().relocatable())
+ osym.put_st_value(0);
+ else
+ 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));
+
+ unsigned int shndx = os->out_shndx();
+ if (shndx >= elfcpp::SHN_LORESERVE)
+ {
+ symtab_xindex->add(os->symtab_index(), shndx);
+ shndx = elfcpp::SHN_XINDEX;
+ }
+ osym.put_st_shndx(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. Also note, one_addr2line is not
+ // currently thread-safe.
+ Task_lock_obj<Object> tl(task, locs->object);
+ // 16 is the size of the object-cache that one_addr2line should use.
+ std::string lineno = Dwarf_line_info::one_addr2line(
+ locs->object, locs->shndx, locs->offset, 16);
+ 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());
+ }
+ }
+ // We only call one_addr2line() in this function, so we can clear its cache.
+ Dwarf_line_info::clear_addr2line_cache();
+}
+
+// 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,
+ size_t symndx_offset,
+ const char* sym_names,
+ size_t sym_name_size,
+ Sized_relobj<32, false>::Symbols* sympointers,
+ size_t* defined);
+#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,
+ size_t symndx_offset,
+ const char* sym_names,
+ size_t sym_name_size,
+ Sized_relobj<32, true>::Symbols* sympointers,
+ size_t* defined);
+#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,
+ size_t symndx_offset,
+ const char* sym_names,
+ size_t sym_name_size,
+ Sized_relobj<64, false>::Symbols* sympointers,
+ size_t* defined);
+#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,
+ size_t symndx_offset,
+ const char* sym_names,
+ size_t sym_name_size,
+ Sized_relobj<64, true>::Symbols* sympointers,
+ size_t* defined);
+#endif
+
+#ifdef HAVE_TARGET_32_LITTLE
+template
+Symbol*
+Symbol_table::add_from_pluginobj<32, false>(
+ Sized_pluginobj<32, false>* obj,
+ const char* name,
+ const char* ver,
+ elfcpp::Sym<32, false>* sym);
+#endif
+
+#ifdef HAVE_TARGET_32_BIG
+template
+Symbol*
+Symbol_table::add_from_pluginobj<32, true>(
+ Sized_pluginobj<32, true>* obj,
+ const char* name,
+ const char* ver,
+ elfcpp::Sym<32, true>* sym);
+#endif
+
+#ifdef HAVE_TARGET_64_LITTLE
+template
+Symbol*
+Symbol_table::add_from_pluginobj<64, false>(
+ Sized_pluginobj<64, false>* obj,
+ const char* name,
+ const char* ver,
+ elfcpp::Sym<64, false>* sym);
+#endif
+
+#ifdef HAVE_TARGET_64_BIG
+template
+Symbol*
+Symbol_table::add_from_pluginobj<64, true>(
+ Sized_pluginobj<64, true>* obj,
+ const char* name,
+ const char* ver,
+ elfcpp::Sym<64, true>* sym);
+#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,
+ Sized_relobj<32, false>::Symbols* sympointers,
+ size_t* defined);
+#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,
+ Sized_relobj<32, true>::Symbols* sympointers,
+ size_t* defined);
+#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,
+ Sized_relobj<64, false>::Symbols* sympointers,
+ size_t* defined);
+#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,
+ Sized_relobj<64, true>::Symbols* sympointers,
+ size_t* defined);
+#endif
+
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+template
+void
+Symbol_table::define_with_copy_reloc<32>(
+ 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>(
+ 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
+
+} // End namespace gold.
projects / msp430-binutils.git / blobdiff