// 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 "demangle.h"
#include "object.h"
+#include "dwarf_reader.h"
+#include "dynobj.h"
#include "output.h"
#include "target.h"
#include "workqueue.h"
{
this->name_ = name;
this->version_ = version;
+ 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->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;
+}
+
+// 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->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.
sym.get_st_visibility(), sym.get_st_nonvis());
this->u_.from_object.object = object;
// FIXME: Handle SHN_XINDEX.
- this->u_.from_object.shnum = sym.get_st_shndx();
+ 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();
}
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
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
{
this->init_fields(name, NULL, type, binding, visibility, nonvis);
this->source_ = CONSTANT;
+ this->in_reg_ = 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.
this->symsize_ = symsize;
}
+// 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;
+}
+
+// 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), saw_undefined_(0), offset_(0), table_(), namepool_(),
+ : saw_undefined_(0), offset_(0), table_(), namepool_(),
forwarders_(), commons_(), warnings_()
{
}
return k1.first == k2.first && k1.second == k2.second;
}
-// Make TO a symbol which forwards to FROM.
+// Make TO a symbol which forwards to FROM.
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;
}
template<int size, bool big_endian>
void
-Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from
- ACCEPT_SIZE_ENDIAN)
+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_size(from->symsize());
esym.put_st_info(from->binding(), from->type());
esym.put_st_other(from->visibility(), from->nonvis());
- esym.put_st_shndx(from->shnum());
- Symbol_table::resolve(to, esym.sym(), from->object());
+ 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();
}
// Add one symbol from OBJECT to the symbol table. NAME is symbol
// 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*
+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)
+ 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 =
// We already have an entry for NAME/VERSION.
ret = this->get_sized_symbol SELECT_SIZE_NAME(size) (ins.first->second
SELECT_SIZE(size));
- assert(ret != NULL);
+ gold_assert(ret != NULL);
was_undefined = ret->is_undefined();
was_common = ret->is_common();
- Symbol_table::resolve(ret, sym, object);
+ 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.
insdef.first->second
SELECT_SIZE(size));
Symbol_table::resolve SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
- ret, sym2 SELECT_SIZE_ENDIAN(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.
+ // 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));
- Symbol_table::resolve(ret, sym, object);
+ this->resolve(ret, sym, orig_sym, object, version);
ins.first->second = ret;
}
else
{
// 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;
}
}
template<int size, bool big_endian>
void
-Symbol_table::add_from_object(
- Relobj* object,
+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);
-
- 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);
- }
+ gold_assert(size == relobj->target()->get_size());
+ gold_assert(size == parameters->get_size());
const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
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];
unsigned int st_shndx = psym->get_st_shndx();
if (st_shndx != elfcpp::SHN_UNDEF
&& st_shndx < elfcpp::SHN_LORESERVE
- && !object->is_section_included(st_shndx))
+ && !relobj->is_section_included(st_shndx))
{
memcpy(symbuf, p, sym_size);
elfcpp::Sym_write<size, big_endian> sw(symbuf);
psym = &sym2;
}
- const char* name = sym_names + st_name;
-
// 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)
{
Stringpool::Key name_key;
- name = this->namepool_.add(name, &name_key);
- res = this->add_from_object(object, name, name_key, NULL, 0,
- false, *psym);
+ name = this->namepool_.add(name, true, &name_key);
+ res = this->add_from_object(relobj, name, name_key, NULL, 0,
+ false, *psym, sym);
}
else
{
Stringpool::Key name_key;
- name = this->namepool_.add(name, ver - name, &name_key);
+ name = this->namepool_.add_prefix(name, ver - name, &name_key);
bool def = false;
++ver;
}
Stringpool::Key ver_key;
- ver = this->namepool_.add(ver, &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);
+ }
+
+ (*sympointers)[i] = 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)
+{
+ 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)
+ {
+ 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;
+ }
- res = this->add_from_object(object, name, name_key, ver, ver_key,
- def, *psym);
+ 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);
+ }
+ }
}
- *sympointers++ = res;
+ 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);
+}
+
+// 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
+{
+ 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)
+ {
+ if ((*q)->shndx() != from_sym->shndx()
+ || (*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 canonicalizes *PNAME and *PVERSION.
template<int size, bool big_endian>
Sized_symbol<size>*
-Symbol_table::define_special_symbol(Target* target, const char* name,
- bool only_if_ref
+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)
{
- assert(this->size_ == size);
-
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(name, NULL);
+ oldsym = this->lookup(*pname, *pversion);
if (oldsym == NULL || !oldsym->is_undefined())
return NULL;
- sym = NULL;
- // Canonicalize NAME.
- name = oldsym->name();
+ *pname = oldsym->name();
+ *pversion = oldsym->version();
}
else
{
- // Canonicalize NAME.
+ // Canonicalize NAME and VERSION.
Stringpool::Key name_key;
- name = this->namepool_.add(name, &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;
- const Stringpool::Key ver_key = 0;
std::pair<typename Symbol_table_type::iterator, bool> ins =
- this->table_.insert(std::make_pair(std::make_pair(name_key, ver_key),
+ 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.
+ // We already have a symbol table entry for NAME/VERSION.
oldsym = ins.first->second;
- assert(oldsym != NULL);
- sym = NULL;
+ gold_assert(oldsym != NULL);
}
else
{
// We haven't seen this symbol before.
- assert(ins.first->second == NULL);
-
- if (!target->has_make_symbol())
- sym = new Sized_symbol<size>();
- else
- {
- assert(target->get_size() == size);
- assert(target->is_big_endian() ? big_endian : !big_endian);
- typedef Sized_target<size, big_endian> My_target;
- My_target* sized_target = static_cast<My_target*>(target);
- sym = sized_target->make_symbol();
- if (sym == NULL)
- return NULL;
- }
-
- ins.first->second = sym;
+ gold_assert(ins.first->second == NULL);
+ add_to_table = true;
+ add_loc = ins.first;
oldsym = NULL;
}
}
- if (oldsym != NULL)
+ if (!target->has_make_symbol())
+ sym = new Sized_symbol<size>();
+ else
{
- assert(sym == NULL);
+ 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;
+ }
- sym = this->get_sized_symbol SELECT_SIZE_NAME(size) (oldsym
- SELECT_SIZE(size));
- assert(sym->source() == Symbol::FROM_OBJECT);
- const int old_shnum = sym->shnum();
- if (old_shnum != elfcpp::SHN_UNDEF
- && old_shnum != elfcpp::SHN_COMMON
- && !sym->object()->is_dynamic())
- {
- fprintf(stderr, "%s: linker defined: multiple definition of %s\n",
- program_name, name);
- // FIXME: Report old location. Record that we have seen an
- // error.
- return NULL;
- }
+ if (add_to_table)
+ add_loc->second = sym;
+ else
+ gold_assert(oldsym != NULL);
- // Our new definition is going to override the old reference.
- }
+ *poldsym = this->get_sized_symbol SELECT_SIZE_NAME(size) (oldsym
+ SELECT_SIZE(size));
return sym;
}
// Define a symbol based on an Output_data.
-void
-Symbol_table::define_in_output_data(Target* target, const char* name,
- Output_data* od,
+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,
bool offset_is_from_end,
bool only_if_ref)
{
- assert(target->get_size() == this->size_);
- if (this->size_ == 32)
- this->do_define_in_output_data<32>(target, name, od, value, symsize,
- type, binding, visibility, nonvis,
- offset_is_from_end, only_if_ref);
- else if (this->size_ == 64)
- this->do_define_in_output_data<64>(target, name, od, value, symsize,
- type, binding, visibility, nonvis,
- offset_is_from_end, 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
- abort();
+ gold_unreachable();
}
// Define a symbol in an Output_data, sized version.
template<int size>
-void
+Sized_symbol<size>*
Symbol_table::do_define_in_output_data(
- Target* target,
+ 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,
bool only_if_ref)
{
Sized_symbol<size>* sym;
+ Sized_symbol<size>* oldsym;
- if (target->is_big_endian())
- sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) (
- target, name, only_if_ref
- SELECT_SIZE_ENDIAN(size, true));
+ 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
- sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) (
- target, name, only_if_ref
- SELECT_SIZE_ENDIAN(size, false));
+ {
+#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;
+ 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.
-void
-Symbol_table::define_in_output_segment(Target* target, const char* name,
- Output_segment* os,
+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,
Symbol::Segment_offset_base offset_base,
bool only_if_ref)
{
- assert(target->get_size() == this->size_);
- if (this->size_ == 32)
- this->do_define_in_output_segment<32>(target, name, os, value, symsize,
- type, binding, visibility, nonvis,
- offset_base, only_if_ref);
- else if (this->size_ == 64)
- this->do_define_in_output_segment<64>(target, name, os, value, symsize,
- type, binding, visibility, nonvis,
- offset_base, 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
- abort();
+ gold_unreachable();
}
// Define a symbol in an Output_segment, sized version.
template<int size>
-void
+Sized_symbol<size>*
Symbol_table::do_define_in_output_segment(
- Target* target,
+ 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,
bool only_if_ref)
{
Sized_symbol<size>* sym;
+ Sized_symbol<size>* oldsym;
- if (target->is_big_endian())
- sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) (
- target, name, only_if_ref
- SELECT_SIZE_ENDIAN(size, true));
+ 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
- sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) (
- target, name, only_if_ref
- SELECT_SIZE_ENDIAN(size, false));
+ {
+#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;
+ 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.
-void
-Symbol_table::define_as_constant(Target* target, const char* name,
- uint64_t value, uint64_t symsize,
- elfcpp::STT type, elfcpp::STB binding,
- elfcpp::STV visibility, unsigned char nonvis,
- bool only_if_ref)
+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)
{
- assert(target->get_size() == this->size_);
- if (this->size_ == 32)
- this->do_define_as_constant<32>(target, name, value, symsize,
- type, binding, visibility, nonvis,
- only_if_ref);
- else if (this->size_ == 64)
- this->do_define_as_constant<64>(target, name, value, symsize,
- type, binding, visibility, nonvis,
- 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
- abort();
+ gold_unreachable();
}
// Define a symbol as a constant, sized version.
template<int size>
-void
+Sized_symbol<size>*
Symbol_table::do_define_as_constant(
- Target* target,
+ 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,
bool only_if_ref)
{
Sized_symbol<size>* sym;
+ Sized_symbol<size>* oldsym;
- if (target->is_big_endian())
- sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) (
- target, name, only_if_ref
- SELECT_SIZE_ENDIAN(size, true));
+ 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
- sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) (
- target, name, only_if_ref
- SELECT_SIZE_ENDIAN(size, false));
+ {
+#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;
+ 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, Target* target, int count,
- const Define_symbol_in_section* p)
+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, os, p->value, p->size,
- p->type, p->binding, p->visibility,
- p->nonvis, p->offset_is_from_end,
- p->only_if_ref);
+ 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, 0, p->size, p->type,
+ 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, Target* target, int count,
- const Define_symbol_in_segment* p)
+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)
{
p->segment_flags_set,
p->segment_flags_clear);
if (os != NULL)
- this->define_in_output_segment(target, p->name, os, p->value, p->size,
- p->type, p->binding, p->visibility,
- p->nonvis, p->offset_base,
- p->only_if_ref);
+ 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, 0, p->size, p->type,
+ this->define_as_constant(target, p->name, NULL, 0, p->size, p->type,
p->binding, p->visibility, p->nonvis,
p->only_if_ref);
}
}
-// Set the final values for all the symbols. Record the file offset
+// 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(off_t off, Stringpool* pool)
+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;
- if (this->size_ == 32)
- ret = this->sized_finalize<32>(off, pool);
- else if (this->size_ == 64)
- ret = this->sized_finalize<64>(off, pool);
+ 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
- abort();
+ gold_unreachable();
// Now that we have the final symbol table, we can reliably note
// which symbols should get warnings.
template<int size>
off_t
-Symbol_table::sized_finalize(off_t off, Stringpool* pool)
+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;
- Symbol_table_type::iterator p = this->table_.begin();
- size_t count = 0;
- while (p != this->table_.end())
+ 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.
+ // 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;
{
case Symbol::FROM_OBJECT:
{
- unsigned int shnum = sym->shnum();
+ unsigned int shndx = sym->shndx();
// FIXME: We need some target specific support here.
- if (shnum >= elfcpp::SHN_LORESERVE
- && shnum != elfcpp::SHN_ABS)
+ if (shndx >= elfcpp::SHN_LORESERVE
+ && shndx != elfcpp::SHN_ABS)
{
- fprintf(stderr, _("%s: %s: unsupported symbol section 0x%x\n"),
- program_name, sym->name(), shnum);
- gold_exit(false);
+ gold_error(_("%s: unsupported symbol section 0x%x"),
+ sym->demangled_name().c_str(), shndx);
+ shndx = elfcpp::SHN_UNDEF;
}
Object* symobj = sym->object();
if (symobj->is_dynamic())
{
value = 0;
- shnum = elfcpp::SHN_UNDEF;
+ shndx = elfcpp::SHN_UNDEF;
}
- else if (shnum == elfcpp::SHN_UNDEF)
+ else if (shndx == elfcpp::SHN_UNDEF)
value = 0;
- else if (shnum == elfcpp::SHN_ABS)
+ 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(shnum, &secoff);
+ Output_section* os = relobj->output_section(shndx, &secoff);
if (os == NULL)
{
- // We should be able to erase this symbol from the
- // symbol table, but at least with gcc 4.0.2
- // std::unordered_map::erase doesn't appear to return
- // the new iterator.
- // p = this->table_.erase(p);
- ++p;
+ sym->set_symtab_index(-1U);
+ gold_assert(sym->dynsym_index() == -1U);
continue;
}
value += os->filesz();
break;
default:
- abort();
+ gold_unreachable();
}
}
break;
break;
default:
- abort();
+ gold_unreachable();
}
sym->set_value(value);
- pool->add(sym->name(), NULL);
- ++count;
- off += sym_size;
- ++p;
+
+ 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_ = count;
+ this->output_count_ = index - orig_index;
return off;
}
// Write out the global symbols.
void
-Symbol_table::write_globals(const Target* target, const Stringpool* sympool,
- Output_file* of) const
+Symbol_table::write_globals(const Input_objects* input_objects,
+ const Stringpool* sympool,
+ const Stringpool* dynpool, Output_file* of) const
{
- if (this->size_ == 32)
+ if (parameters->get_size() == 32)
{
- if (target->is_big_endian())
- this->sized_write_globals<32, true>(target, sympool, of);
+ if (parameters->is_big_endian())
+ {
+#ifdef HAVE_TARGET_32_BIG
+ this->sized_write_globals<32, true>(input_objects, sympool,
+ dynpool, of);
+#else
+ gold_unreachable();
+#endif
+ }
else
- this->sized_write_globals<32, false>(target, sympool, of);
+ {
+#ifdef HAVE_TARGET_32_LITTLE
+ this->sized_write_globals<32, false>(input_objects, sympool,
+ dynpool, of);
+#else
+ gold_unreachable();
+#endif
+ }
}
- else if (this->size_ == 64)
+ else if (parameters->get_size() == 64)
{
- if (target->is_big_endian())
- this->sized_write_globals<64, true>(target, sympool, of);
+ if (parameters->is_big_endian())
+ {
+#ifdef HAVE_TARGET_64_BIG
+ this->sized_write_globals<64, true>(input_objects, sympool,
+ dynpool, of);
+#else
+ gold_unreachable();
+#endif
+ }
else
- this->sized_write_globals<64, false>(target, sympool, of);
+ {
+#ifdef HAVE_TARGET_64_LITTLE
+ this->sized_write_globals<64, false>(input_objects, sympool,
+ dynpool, of);
+#else
+ gold_unreachable();
+#endif
+ }
}
else
- abort();
+ gold_unreachable();
}
// Write out the global symbols.
template<int size, bool big_endian>
void
-Symbol_table::sized_write_globals(const Target*,
+Symbol_table::sized_write_globals(const Input_objects* input_objects,
const Stringpool* sympool,
+ const Stringpool* dynpool,
Output_file* of) const
{
+ const Target* const target = input_objects->target();
+
const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
- unsigned char* psyms = of->get_output_view(this->offset_,
- this->output_count_ * 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();
{
Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second);
+ // Possibly warn about unresolved symbols in shared libraries.
+ this->warn_about_undefined_dynobj_symbol(input_objects, sym);
+
+ unsigned int sym_index = sym->symtab_index();
+ unsigned int dynsym_index;
+ if (dynamic_view == NULL)
+ dynsym_index = -1U;
+ else
+ dynsym_index = sym->dynsym_index();
+
+ if (sym_index == -1U && dynsym_index == -1U)
+ {
+ // This symbol is not included in the output file.
+ continue;
+ }
+
+ 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 shnum = sym->shnum();
+ unsigned int in_shndx = sym->shndx();
// FIXME: We need some target specific support here.
- if (shnum >= elfcpp::SHN_LORESERVE
- && shnum != elfcpp::SHN_ABS)
+ if (in_shndx >= elfcpp::SHN_LORESERVE
+ && in_shndx != elfcpp::SHN_ABS)
{
- fprintf(stderr, _("%s: %s: unsupported symbol section 0x%x\n"),
- program_name, sym->name(), sym->shnum());
- gold_exit(false);
+ gold_error(_("%s: unsupported symbol section 0x%x"),
+ sym->demangled_name().c_str(), in_shndx);
+ shndx = in_shndx;
}
-
- Object* symobj = sym->object();
- if (symobj->is_dynamic())
- {
- // FIXME.
- shndx = elfcpp::SHN_UNDEF;
- }
- else if (shnum == elfcpp::SHN_UNDEF || shnum == elfcpp::SHN_ABS)
- shndx = shnum;
else
{
- Relobj* relobj = static_cast<Relobj*>(symobj);
- off_t secoff;
- Output_section* os = relobj->output_section(shnum, &secoff);
- if (os == NULL)
- continue;
-
- shndx = os->out_shndx();
+ 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;
break;
default:
- abort();
+ gold_unreachable();
}
- elfcpp::Sym_write<size, big_endian> osym(ps);
- osym.put_st_name(sympool->get_offset(sym->name()));
- osym.put_st_value(sym->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);
+ 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);
+}
+
+// Check for unresolved symbols in shared libraries. This is
+// controlled by the --allow-shlib-undefined option.
+
+// We only warn about libraries for which we have seen all the
+// DT_NEEDED entries. We don't try to track down DT_NEEDED entries
+// which were not seen in this link. If we didn't see a DT_NEEDED
+// entry, we aren't going to be able to reliably report whether the
+// symbol is undefined.
+
+// We also don't warn about libraries found in the system library
+// directory (the directory were we find libc.so); we assume that
+// those libraries are OK. This heuristic avoids problems in
+// GNU/Linux, in which -ldl can have undefined references satisfied by
+// ld-linux.so.
+
+inline void
+Symbol_table::warn_about_undefined_dynobj_symbol(
+ const Input_objects* input_objects,
+ Symbol* sym) const
+{
+ if (sym->source() == Symbol::FROM_OBJECT
+ && sym->object()->is_dynamic()
+ && sym->shndx() == elfcpp::SHN_UNDEF
+ && sym->binding() != elfcpp::STB_WEAK
+ && !parameters->allow_shlib_undefined()
+ && !input_objects->target()->is_defined_by_abi(sym)
+ && !input_objects->found_in_system_library_directory(sym->object()))
+ {
+ // A very ugly cast.
+ Dynobj* dynobj = static_cast<Dynobj*>(sym->object());
+ if (!dynobj->has_unknown_needed_entries())
+ gold_error(_("%s: undefined reference to '%s'"),
+ sym->object()->name().c_str(),
+ sym->demangled_name().c_str());
+ }
+}
+
+// Write out a section symbol. Return the update offset.
- ps += sym_size;
+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);
+}
- of->write_output_view(this->offset_, this->output_count_ * sym_size, psyms);
+// 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 imlements 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 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 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(_("while linking %s: symbol '%s' defined in multiple "
+ "places (possible ODR violation):"),
+ output_file_name, demangle(symbol_name).c_str());
+ for (std::set<std::string>::const_iterator it2 = line_nums.begin();
+ it2 != line_nums.end();
+ ++it2)
+ fprintf(stderr, " %s\n", it2->c_str());
+ }
+ }
}
// Warnings functions.
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);
+ 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(Symbol* sym, const std::string& location) const
+Warnings::issue_warning(const Symbol* sym,
+ const Relocate_info<size, big_endian>* relinfo,
+ size_t relnum, off_t reloffset) const
{
- assert(sym->has_warning());
+ gold_assert(sym->has_warning());
Warning_table::const_iterator p = this->warnings_.find(sym->name());
- assert(p != this->warnings_.end());
- fprintf(stderr, _("%s: %s: warning: %s\n"), program_name, location.c_str(),
- p->second.text.c_str());
+ 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
-Symbol_table::add_from_object<32, true>(
- Relobj* object,
+Sized_symbol<64>::allocate_common(Output_data*, Value_type);
+#endif
+
+#ifdef HAVE_TARGET_32_LITTLE
+template
+void
+Symbol_table::add_from_relobj<32, false>(
+ Sized_relobj<32, false>* relobj,
const unsigned char* syms,
size_t count,
const char* sym_names,
size_t sym_name_size,
- Symbol** sympointers);
+ Sized_relobj<32, true>::Symbols* sympointers);
+#endif
+#ifdef HAVE_TARGET_32_BIG
template
void
-Symbol_table::add_from_object<32, false>(
- Relobj* object,
+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,
- Symbol** sympointers);
+ Sized_relobj<32, false>::Symbols* sympointers);
+#endif
+#ifdef HAVE_TARGET_64_LITTLE
template
void
-Symbol_table::add_from_object<64, true>(
- Relobj* object,
+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,
- Symbol** sympointers);
+ Sized_relobj<64, true>::Symbols* sympointers);
+#endif
+#ifdef HAVE_TARGET_64_BIG
template
void
-Symbol_table::add_from_object<64, false>(
- Relobj* object,
+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,
- Symbol** sympointers);
+ 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 / deliverable / binutils-gdb.git / blobdiff