// symtab.cc -- the gold symbol table
+// Copyright 2006, 2007 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 <cassert>
#include <stdint.h>
+#include <set>
#include <string>
#include <utility>
#include "object.h"
+#include "dwarf_reader.h"
+#include "dynobj.h"
+#include "output.h"
+#include "target.h"
+#include "workqueue.h"
#include "symtab.h"
namespace gold
// Class Symbol.
-// Initialize the fields in the base class Symbol.
+// Initialize fields in Symbol. This initializes everything except u_
+// and source_.
-template<int size, bool big_endian>
void
-Symbol::init_base(const char* name, const char* version, Object* object,
- const elfcpp::Sym<size, big_endian>& sym)
+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->object_ = object;
- this->shnum_ = sym.get_st_shndx(); // FIXME: Handle SHN_XINDEX.
- this->type_ = sym.get_st_type();
- this->binding_ = sym.get_st_bind();
- this->visibility_ = sym.get_st_visibility();
- this->other_ = sym.get_st_nonvis();
- this->is_special_ = false;
+ this->symtab_index_ = 0;
+ this->dynsym_index_ = 0;
+ this->got_offset_ = 0;
+ 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_got_offset_ = false;
+ this->has_plt_offset_ = false;
+ this->has_warning_ = false;
+ this->is_copied_from_dynobj_ = false;
+ this->needs_value_in_got_ = false;
+}
+
+// Initialize the fields in the base class Symbol for SYM in OBJECT.
+
+template<int size, bool big_endian>
+void
+Symbol::init_base(const char* name, const char* version, Object* object,
+ const elfcpp::Sym<size, big_endian>& sym)
+{
+ 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;
+ // FIXME: Handle SHN_XINDEX.
+ this->u_.from_object.shndx = sym.get_st_shndx();
+ this->source_ = FROM_OBJECT;
+ this->in_reg_ = !object->is_dynamic();
this->in_dyn_ = object->is_dynamic();
}
-// Initialize the fields in Sized_symbol.
+// Initialize the fields in the base class Symbol for a symbol defined
+// in an Output_data.
+
+void
+Symbol::init_base(const char* name, Output_data* od, elfcpp::STT type,
+ elfcpp::STB binding, elfcpp::STV visibility,
+ unsigned char nonvis, bool offset_is_from_end)
+{
+ this->init_fields(name, NULL, 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;
+}
+
+// Initialize the fields in the base class Symbol for a symbol defined
+// in an Output_segment.
+
+void
+Symbol::init_base(const char* name, Output_segment* os, elfcpp::STT type,
+ elfcpp::STB binding, elfcpp::STV visibility,
+ unsigned char nonvis, Segment_offset_base offset_base)
+{
+ this->init_fields(name, NULL, 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;
+}
+
+// Initialize the fields in the base class Symbol for a symbol defined
+// as a constant.
+
+void
+Symbol::init_base(const char* name, elfcpp::STT type,
+ elfcpp::STB binding, elfcpp::STV visibility,
+ unsigned char nonvis)
+{
+ this->init_fields(name, NULL, type, binding, visibility, nonvis);
+ this->source_ = CONSTANT;
+ this->in_reg_ = true;
+}
+
+// Initialize the fields in Sized_symbol for SYM in OBJECT.
template<int size>
template<bool big_endian>
{
this->init_base(name, version, object, sym);
this->value_ = sym.get_st_value();
- this->size_ = sym.get_st_size();
+ 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(const char* name, 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(name, 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(const char* name, 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(name, 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(const char* name, Value_type value, Size_type symsize,
+ elfcpp::STT type, elfcpp::STB binding,
+ elfcpp::STV visibility, unsigned char nonvis)
+{
+ this->init_base(name, type, binding, visibility, nonvis);
+ this->value_ = value;
+ this->symsize_ = symsize;
+}
+
+// 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 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->export_dynamic() || parameters->output_is_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->output_is_executable())
+ return false;
+
+ // If the symbol is not from an object file, then it is defined, and
+ // known.
+ if (this->source_ != FROM_OBJECT)
+ return true;
+
+ // 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();
}
// Class Symbol_table.
Symbol_table::Symbol_table()
- : size_(0), table_(), namepool_(), output_pool_(), forwarders_()
+ : saw_undefined_(0), offset_(0), table_(), namepool_(),
+ forwarders_(), commons_(), warnings_()
{
}
size_t
Symbol_table::Symbol_table_hash::operator()(const Symbol_table_key& key) const
{
- return (reinterpret_cast<size_t>(key.first)
- ^ reinterpret_cast<size_t>(key.second));
+ return key.first ^ key.second;
}
// The symbol table key equality function. This is only called with
void
Symbol_table::make_forwarder(Symbol* from, Symbol* to)
{
- assert(!from->is_forwarder() && !to->is_forwarder());
+ 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(Symbol* from) const
+Symbol_table::resolve_forwards(const Symbol* from) const
{
- assert(from->is_forwarder());
- Unordered_map<Symbol*, Symbol*>::const_iterator p =
+ gold_assert(from->is_forwarder());
+ Unordered_map<const Symbol*, Symbol*>::const_iterator p =
this->forwarders_.find(from);
- assert(p != this->forwarders_.end());
+ 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;
}
// version is the default version. Because this is unusual, we do
// this the slow way, by converting back to an ELF symbol.
-#ifdef HAVE_MEMBER_TEMPLATE_SPECIFICATIONS
-
template<int size, bool big_endian>
void
-Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from)
+Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from,
+ const char* version ACCEPT_SIZE_ENDIAN)
{
unsigned char buf[elfcpp::Elf_sizes<size>::sym_size];
elfcpp::Sym_write<size, big_endian> esym(buf);
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->other());
- esym.put_st_shndx(from->shnum());
- Symbol_table::resolve(to, esym.sym(), from->object());
-}
-
-#else
-
-template<int size>
-void
-Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from,
- bool big_endian)
-{
- unsigned char buf[elfcpp::Elf_sizes<size>::sym_size];
- if (big_endian)
- {
- elfcpp::Sym_write<size, true> esym(buf);
- // We don't bother to set the st_name 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->other());
- esym.put_st_shndx(from->shnum());
- Symbol_table::resolve(to, esym.sym(), from->object());
- }
- else
- {
- elfcpp::Sym_write<size, false> esym(buf);
- // We don't bother to set the st_name 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->other());
- esym.put_st_shndx(from->shnum());
- Symbol_table::resolve(to, esym.sym(), from->object());
- }
+ esym.put_st_other(from->visibility(), from->nonvis());
+ esym.put_st_shndx(from->shndx());
+ this->resolve(to, esym.sym(), esym.sym(), from->object(), version);
+ if (from->in_reg())
+ to->set_in_reg();
+ if (from->in_dyn())
+ to->set_in_dyn();
}
-#endif
-
// 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.
// 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.
+//
+// SYM and ORIG_SYM are almost always the same. ORIG_SYM is the
+// symbol exactly as it existed in the input file. SYM is usually
+// that as well, but can be modified, for instance if we determine
+// it's in a to-be-discarded section.
template<int size, bool big_endian>
-Symbol*
-Symbol_table::add_from_object(Sized_object<size, big_endian>* object,
+Sized_symbol<size>*
+Symbol_table::add_from_object(Object* object,
const char *name,
- const char *version, bool def,
- const elfcpp::Sym<size, big_endian>& sym)
+ Stringpool::Key name_key,
+ const char *version,
+ Stringpool::Key version_key,
+ bool def,
+ const elfcpp::Sym<size, big_endian>& sym,
+ const elfcpp::Sym<size, big_endian>& orig_sym)
{
Symbol* const snull = NULL;
std::pair<typename Symbol_table_type::iterator, bool> ins =
- this->table_.insert(std::make_pair(std::make_pair(name, version), snull));
+ 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 char* const vnull = NULL;
- insdef = this->table_.insert(std::make_pair(std::make_pair(name, vnull),
+ const Stringpool::Key vnull_key = 0;
+ insdef = this->table_.insert(std::make_pair(std::make_pair(name_key,
+ vnull_key),
snull));
}
// 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.
-#ifdef HAVE_MEMBER_TEMPLATE_SPECIFICATIONS
- ret = this->get_sized_symbol<size>(ins.first->second);
-#else
- assert(size == this->get_size());
- ret = static_cast<Sized_symbol<size>*>(ins.first->second);
-#endif
- assert(ret != NULL);
- Symbol_table::resolve(ret, sym, object);
+ ret = this->get_sized_symbol SELECT_SIZE_NAME(size) (ins.first->second
+ SELECT_SIZE(size));
+ gold_assert(ret != NULL);
+
+ was_undefined = ret->is_undefined();
+ was_common = ret->is_common();
+
+ this->resolve(ret, sym, orig_sym, object, version);
if (def)
{
// NAME/NULL point to NAME/VERSION.
insdef.first->second = ret;
}
- else
+ else if (insdef.first->second != ret)
{
// This is the unfortunate case where we already have
// entries for both NAME/VERSION and NAME/NULL.
const Sized_symbol<size>* sym2;
-#ifdef HAVE_MEMBER_TEMPLATE_SPECIFICATIONS
- sym2 = this->get_sized_symbol<size>(insdef.first->second);
- Symbol_table::resolve<size, big_endian>(ret, sym2);
-#else
- sym2 = static_cast<Sized_symbol<size>*>(insdef.first->second);
- Symbol_table::resolve(ret, sym2, big_endian);
-#endif
+ sym2 = this->get_sized_symbol SELECT_SIZE_NAME(size) (
+ insdef.first->second
+ SELECT_SIZE(size));
+ Symbol_table::resolve SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
+ ret, sym2, version SELECT_SIZE_ENDIAN(size, big_endian));
this->make_forwarder(insdef.first->second, ret);
insdef.first->second = ret;
}
else
{
// This is the first time we have seen NAME/VERSION.
- assert(ins.first->second == NULL);
+ gold_assert(ins.first->second == NULL);
+
+ was_undefined = false;
+ was_common = false;
+
if (def && !insdef.second)
{
- // We already have an entry for NAME/NULL. Make
- // NAME/VERSION point to it.
-#ifdef HAVE_MEMBER_TEMPLATE_SPECIFICATIONS
- ret = this->get_sized_symbol<size>(insdef.first->second);
-#else
- ret = static_cast<Sized_symbol<size>*>(insdef.first->second);
-#endif
- Symbol_table::resolve(ret, sym, object);
+ // We already have an entry for NAME/NULL. If we override
+ // it, then change it to NAME/VERSION.
+ ret = this->get_sized_symbol SELECT_SIZE_NAME(size) (
+ insdef.first->second
+ SELECT_SIZE(size));
+ this->resolve(ret, sym, orig_sym, object, version);
ins.first->second = ret;
}
else
{
- Sized_target<size, big_endian>* target = object->sized_target();
+ Sized_target<size, big_endian>* target =
+ object->sized_target SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
+ SELECT_SIZE_ENDIAN_ONLY(size, big_endian));
if (!target->has_make_symbol())
ret = new Sized_symbol<size>();
else
{
this->table_.erase(insdef.first);
// Inserting insdef invalidated ins.
- this->table_.erase(std::make_pair(name, version));
+ this->table_.erase(std::make_pair(name_key,
+ version_key));
}
return NULL;
}
{
// This is the first time we have seen NAME/NULL. Point
// it at the new entry for NAME/VERSION.
- assert(insdef.second);
+ gold_assert(insdef.second);
insdef.first->second = ret;
}
}
}
+ // 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())
+ this->commons_.push_back(ret);
+
return ret;
}
-// Add all the symbols in an object to the hash table.
+// Add all the symbols in a relocatable object to the hash table.
template<int size, bool big_endian>
void
-Symbol_table::add_from_object(
- Sized_object<size, big_endian>* object,
- const elfcpp::Sym<size, big_endian>* syms,
+Symbol_table::add_from_relobj(
+ Sized_relobj<size, big_endian>* relobj,
+ const unsigned char* syms,
size_t count,
const char* sym_names,
size_t sym_name_size,
- Symbol** sympointers)
+ typename Sized_relobj<size, big_endian>::Symbols* sympointers)
{
- // We take the size from the first object we see.
- if (this->get_size() == 0)
- this->set_size(size);
+ gold_assert(size == relobj->target()->get_size());
+ gold_assert(size == parameters->get_size());
- if (size != this->get_size() || size != object->target()->get_size())
- {
- fprintf(stderr, _("%s: %s: mixing 32-bit and 64-bit ELF objects\n"),
- program_name, object->name().c_str());
- gold_exit(false);
- }
+ const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
- const unsigned char* p = reinterpret_cast<const unsigned char*>(syms);
- for (size_t i = 0; i < count; ++i)
+ const unsigned char* p = syms;
+ for (size_t i = 0; i < count; ++i, p += sym_size)
{
elfcpp::Sym<size, big_endian> sym(p);
+ elfcpp::Sym<size, big_endian>* psym = &sym;
- unsigned int st_name = sym.get_st_name();
+ unsigned int st_name = psym->get_st_name();
if (st_name >= sym_name_size)
{
- fprintf(stderr,
- _("%s: %s: bad global symbol name offset %u at %lu\n"),
- program_name, object->name().c_str(), st_name,
- static_cast<unsigned long>(i));
- gold_exit(false);
+ relobj->error(_("bad global symbol name offset %u at %zu"),
+ st_name, i);
+ continue;
}
const char* name = sym_names + st_name;
+ // A symbol defined in a section which we are not including must
+ // be treated as an undefined symbol.
+ unsigned char symbuf[sym_size];
+ elfcpp::Sym<size, big_endian> sym2(symbuf);
+ unsigned int st_shndx = psym->get_st_shndx();
+ if (st_shndx != elfcpp::SHN_UNDEF
+ && st_shndx < elfcpp::SHN_LORESERVE
+ && !relobj->is_section_included(st_shndx))
+ {
+ memcpy(symbuf, p, sym_size);
+ elfcpp::Sym_write<size, big_endian> sw(symbuf);
+ sw.put_st_shndx(elfcpp::SHN_UNDEF);
+ psym = &sym2;
+ }
+
// 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, '@');
- Symbol* res;
+ Sized_symbol<size>* res;
if (ver == NULL)
{
- name = this->namepool_.add(name);
- res = this->add_from_object(object, name, NULL, false, sym);
+ Stringpool::Key name_key;
+ name = this->namepool_.add(name, true, &name_key);
+ res = this->add_from_object(relobj, name, name_key, NULL, 0,
+ false, *psym, sym);
}
else
{
- name = this->namepool_.add(name, ver - name);
+ Stringpool::Key name_key;
+ name = this->namepool_.add_prefix(name, ver - name, &name_key);
+
bool def = false;
++ver;
if (*ver == '@')
def = true;
++ver;
}
- ver = this->namepool_.add(ver);
- res = this->add_from_object(object, name, ver, def, sym);
- }
- *sympointers++ = res;
+ Stringpool::Key ver_key;
+ ver = this->namepool_.add(ver, true, &ver_key);
+
+ res = this->add_from_object(relobj, name, name_key, ver, ver_key,
+ def, *psym, sym);
+ }
- p += elfcpp::Elf_sizes<size>::sym_size;
+ (*sympointers)[i] = res;
}
}
-// Record the names of the local symbols for an object.
+// Add all the symbols in a dynamic object to the hash table.
template<int size, bool big_endian>
void
-Symbol_table::add_local_symbol_names(Sized_object<size, big_endian>* object,
- const elfcpp::Sym<size, big_endian>* syms,
- size_t count, const char* sym_names,
- size_t sym_name_size)
+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)
{
- const unsigned char* p = reinterpret_cast<const unsigned char*>(syms);
- for (size_t i = 0; i < count; ++i)
+ gold_assert(size == dynobj->target()->get_size());
+ gold_assert(size == parameters->get_size());
+
+ 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);
+ // Ignore symbols with local binding.
+ if (sym.get_st_bind() == elfcpp::STB_LOCAL)
+ continue;
+
unsigned int st_name = sym.get_st_name();
if (st_name >= sym_name_size)
{
- fprintf(stderr,
- _("%s: %s: bad local symbol name offset %u at %lu\n"),
- program_name, object->name().c_str(), st_name,
- static_cast<unsigned long>(i));
- gold_exit(false);
+ dynobj->error(_("bad symbol name offset %u at %zu"),
+ st_name, i);
+ continue;
+ }
+
+ const char* name = sym_names + st_name;
+
+ 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, sym, sym);
+ }
+ 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)
+ && sym.get_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, sym, sym);
+ }
+ 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 (sym.get_st_shndx() == elfcpp::SHN_ABS
+ && name_key == version_key)
+ res = this->add_from_object(dynobj, name, name_key, NULL, 0,
+ false, sym, sym);
+ else
+ {
+ const bool def = (!hidden
+ && (sym.get_st_shndx()
+ != elfcpp::SHN_UNDEF));
+ res = this->add_from_object(dynobj, name, name_key, version,
+ version_key, def, sym, sym);
+ }
+ }
}
- this->output_pool_.add(sym_names + st_name);
+ if (sym.get_st_shndx() != elfcpp::SHN_UNDEF
+ && sym.get_st_type() == elfcpp::STT_OBJECT)
+ object_symbols.push_back(res);
}
+
+ this->record_weak_aliases(&object_symbols);
}
-// Instantiate the templates we need. We could use the configure
-// script to restrict this to only the ones needed for implemented
-// targets.
+// This is used to sort weak aliases. We sort them first by section
+// index, then by offset, then by weak ahead of strong.
-template
-void
-Symbol_table::add_from_object<32, true>(
- Sized_object<32, true>* object,
- const elfcpp::Sym<32, true>* syms,
- size_t count,
- const char* sym_names,
- size_t sym_name_size,
- Symbol** sympointers);
+template<int size>
+class Weak_alias_sorter
+{
+ public:
+ bool operator()(const Sized_symbol<size>*, const Sized_symbol<size>*) const;
+};
-template
-void
-Symbol_table::add_from_object<32, false>(
- Sized_object<32, false>* object,
- const elfcpp::Sym<32, false>* syms,
- size_t count,
- const char* sym_names,
- size_t sym_name_size,
- Symbol** sympointers);
+template<int size>
+bool
+Weak_alias_sorter<size>::operator()(const Sized_symbol<size>* s1,
+ const Sized_symbol<size>* s2) const
+{
+ 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());
+}
-template
-void
-Symbol_table::add_from_object<64, true>(
- Sized_object<64, true>* object,
- const elfcpp::Sym<64, true>* syms,
- size_t count,
- const char* sym_names,
- size_t sym_name_size,
- Symbol** sympointers);
+// 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
+template<int size>
void
-Symbol_table::add_from_object<64, false>(
- Sized_object<64, false>* object,
- const elfcpp::Sym<64, false>* syms,
- size_t count,
- const char* sym_names,
- size_t sym_name_size,
- Symbol** sympointers);
+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>());
-template
-void
-Symbol_table::add_local_symbol_names<32, true>(
- Sized_object<32, true>* object,
- const elfcpp::Sym<32, true>* syms,
- size_t count,
- const char* sym_names,
- size_t sym_name_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;
-template
-void
-Symbol_table::add_local_symbol_names<32, false>(
- Sized_object<32, false>* object,
- const elfcpp::Sym<32, false>* syms,
- size_t count,
- const char* sym_names,
- size_t sym_name_size);
+ // Build a circular list of weak aliases. Each symbol points to
+ // the next one in the circular list.
-template
-void
-Symbol_table::add_local_symbol_names<64, true>(
- Sized_object<64, true>* object,
- const elfcpp::Sym<64, true>* syms,
- size_t count,
- const char* sym_names,
- size_t sym_name_size);
+ Sized_symbol<size>* from_sym = *p;
+ typename std::vector<Sized_symbol<size>*>::const_iterator q;
+ for (q = p + 1; q != symbols->end(); ++q)
+ {
+ if ((*q)->shndx() != from_sym->shndx()
+ || (*q)->value() != from_sym->value())
+ break;
-template
-void
-Symbol_table::add_local_symbol_names<64, false>(
- Sized_object<64, false>* object,
- const elfcpp::Sym<64, false>* syms,
- size_t count,
- const char* sym_names,
- size_t sym_name_size);
+ 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 (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
+ && Symbol_table::should_override_with_special(oldsym))
+ this->override_with_special(oldsym, sym);
+
+ return sym;
+}
+
+// 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
+ && Symbol_table::should_override_with_special(oldsym))
+ this->override_with_special(oldsym, sym);
+
+ return sym;
+}
+
+// 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 || oldsym != NULL);
+ sym->init(name, value, symsize, type, binding, visibility, nonvis);
+
+ if (oldsym != NULL
+ && Symbol_table::should_override_with_special(oldsym))
+ this->override_with_special(oldsym, sym);
+
+ return sym;
+}
+
+// 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, uint64_t 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 INDEX. Record the file offset
+// OFF. Add their names to POOL. Return the new file offset.
+
+off_t
+Symbol_table::finalize(unsigned int index, off_t off, off_t dynoff,
+ size_t dyn_global_index, size_t dyncount,
+ Stringpool* pool)
+{
+ off_t ret;
+
+ gold_assert(index != 0);
+ this->first_global_index_ = index;
+
+ 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>(index, off, pool);
+#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>(index, off, pool);
+#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;
+}
+
+// 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(unsigned index, off_t off, Stringpool* pool)
+{
+ off = align_address(off, size >> 3);
+ this->offset_ = off;
+
+ size_t orig_index = index;
+
+ const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
+ for (Symbol_table_type::iterator p = this->table_.begin();
+ p != this->table_.end();
+ ++p)
+ {
+ Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second);
+
+ // FIXME: Here we need to decide which symbols should go into
+ // the output file, based on --strip.
+
+ // 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())
+ continue;
+
+ if (!sym->in_reg())
+ {
+ gold_assert(!sym->has_symtab_index());
+ sym->set_symtab_index(-1U);
+ gold_assert(sym->dynsym_index() == -1U);
+ continue;
+ }
+
+ 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->name(), 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);
+ off_t secoff;
+ Output_section* os = relobj->output_section(shndx, &secoff);
+
+ if (os == NULL)
+ {
+ sym->set_symtab_index(-1U);
+ gold_assert(sym->dynsym_index() == -1U);
+ continue;
+ }
+
+ 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);
+ else
+ {
+ sym->set_symtab_index(index);
+ pool->add(sym->name(), false, NULL);
+ ++index;
+ off += sym_size;
+ }
+ }
+
+ this->output_count_ = index - orig_index;
+
+ return off;
+}
+
+// Write out the global symbols.
+
+void
+Symbol_table::write_globals(const Target* target, 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>(target, sympool, dynpool, of);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#ifdef HAVE_TARGET_32_LITTLE
+ this->sized_write_globals<32, false>(target, 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>(target, sympool, dynpool, of);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#ifdef HAVE_TARGET_64_LITTLE
+ this->sized_write_globals<64, false>(target, 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 Target* target,
+ const Stringpool* sympool,
+ const Stringpool* dynpool,
+ Output_file* of) const
+{
+ const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
+ unsigned int index = this->first_global_index_;
+ const off_t oview_size = this->output_count_ * sym_size;
+ unsigned char* const psyms = of->get_output_view(this->offset_, oview_size);
+
+ unsigned int dynamic_count = this->dynamic_count_;
+ off_t dynamic_size = dynamic_count * sym_size;
+ 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);
+
+ unsigned char* ps = psyms;
+ 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);
+
+ // Optionally 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.
+ if (sym->source() == Symbol::FROM_OBJECT
+ && sym->object()->is_dynamic()
+ && sym->shndx() == elfcpp::SHN_UNDEF
+ && sym->binding() != elfcpp::STB_WEAK
+ && !parameters->allow_shlib_undefined()
+ && !target->is_always_defined(sym))
+ {
+ // 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->name());
+ }
+
+ 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;
+ }
+
+ if (sym_index == index)
+ ++index;
+ else if (sym_index != -1U)
+ {
+ // We have already seen this symbol, because it has a
+ // default version.
+ gold_assert(sym_index < index);
+ if (dynsym_index == -1U)
+ continue;
+ sym_index = -1U;
+ }
+
+ 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->name(), 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);
+ off_t 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)
+ {
+ this->sized_write_symbol SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
+ sym, sym->value(), shndx, sympool, ps
+ SELECT_SIZE_ENDIAN(size, big_endian));
+ ps += sym_size;
+ }
+
+ 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));
+ }
+ }
+
+ gold_assert(ps - psyms == oview_size);
+
+ 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());
+ 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);
+}
+
+// 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);
+}
+
+// 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
+{
+ 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> line_nums;
+
+ Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator
+ locs;
+ for (locs = it->second.begin(); locs != it->second.end(); ++locs)
+ {
+ // We need to lock the object in order to read it. This
+ // means that we can not run inside a Task. If we want to
+ // run this in a 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.
+ locs->object->lock();
+ std::string lineno = Dwarf_line_info::one_addr2line(
+ locs->object, locs->shndx, locs->offset);
+ locs->object->unlock();
+ if (!lineno.empty())
+ line_nums.insert(lineno);
+ }
+
+ if (line_nums.size() > 1)
+ {
+ gold_warning(_("symbol %s defined in multiple places "
+ "(possible ODR violation):"), symbol_name);
+ 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,
+ unsigned int shndx)
+{
+ name = symtab->canonicalize_name(name);
+ this->warnings_[name].set(obj, shndx);
+}
+
+// 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();
+
+ // Read the section contents to get the warning text. It
+ // would be nicer if we only did this if we have to actually
+ // issue a warning. Unfortunately, warnings are issued as
+ // we relocate sections. That means that we can not lock
+ // the object then, as we might try to issue the same
+ // warning multiple times simultaneously.
+ {
+ Task_locker_obj<Object> tl(*p->second.object);
+ const unsigned char* c;
+ off_t len;
+ c = p->second.object->section_contents(p->second.shndx, &len,
+ false);
+ p->second.set_text(reinterpret_cast<const char*>(c), len);
+ }
+ }
+ }
+}
+
+// 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.
+
+#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, uint64_t 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, uint64_t 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 / binutils-gdb.git / blobdiff