// symtab.cc -- the gold symbol table
-// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
// This file is part of gold.
this->symtab_index_ = 0;
this->dynsym_index_ = 0;
this->got_offsets_.init();
- this->plt_offset_ = 0;
+ this->plt_offset_ = -1U;
this->type_ = type;
this->binding_ = binding;
this->visibility_ = visibility;
this->nonvis_ = nonvis;
- this->is_target_special_ = false;
this->is_def_ = false;
this->is_forwarder_ = false;
this->has_alias_ = false;
this->needs_dynsym_entry_ = false;
this->in_reg_ = false;
this->in_dyn_ = false;
- this->has_plt_offset_ = false;
this->has_warning_ = false;
this->is_copied_from_dynobj_ = false;
this->is_forced_local_ = false;
this->is_ordinary_shndx_ = false;
this->in_real_elf_ = false;
+ this->is_defined_in_discarded_section_ = false;
}
// Return the demangled version of the symbol's name, but only
// table.
inline bool
-Symbol::should_add_dynsym_entry() const
+Symbol::should_add_dynsym_entry(Symbol_table* symtab) const
{
// If the symbol is used by a dynamic relocation, we need to add it.
if (this->needs_dynsym_entry())
bool is_ordinary;
unsigned int shndx = this->shndx(&is_ordinary);
if (is_ordinary && shndx != elfcpp::SHN_UNDEF
- && !relobj->is_section_included(shndx))
+ && !relobj->is_section_included(shndx)
+ && !symtab->is_section_folded(relobj, shndx))
return false;
}
// section index; IS_ORDINARY is whether this is a normal section
// rather than a special code.
-// If DEF is true, then this is the definition of a default version of
-// a symbol. That means that any lookup of NAME/NULL and any lookup
-// of NAME/VERSION should always return the same symbol. This is
-// obvious for references, but in particular we want to do this for
-// definitions: overriding NAME/NULL should also override
-// NAME/VERSION. If we don't do that, it would be very hard to
-// override functions in a shared library which uses versioning.
+// If IS_DEFAULT_VERSION is true, then this is the definition of a
+// default version of a symbol. That means that any lookup of
+// NAME/NULL and any lookup of NAME/VERSION should always return the
+// same symbol. This is obvious for references, but in particular we
+// want to do this for definitions: overriding NAME/NULL should also
+// override NAME/VERSION. If we don't do that, it would be very hard
+// to override functions in a shared library which uses versioning.
// We implement this by simply making both entries in the hash table
// point to the same Symbol structure. That is easy enough if this is
Stringpool::Key name_key,
const char *version,
Stringpool::Key version_key,
- bool def,
+ bool is_default_version,
const elfcpp::Sym<size, big_endian>& sym,
unsigned int st_shndx,
bool is_ordinary,
this->table_.insert(std::make_pair(std::make_pair(name_key, version_key),
snull));
- std::pair<typename Symbol_table_type::iterator, bool> insdef =
+ std::pair<typename Symbol_table_type::iterator, bool> insdefault =
std::make_pair(this->table_.end(), false);
- if (def)
+ if (is_default_version)
{
const Stringpool::Key vnull_key = 0;
- insdef = this->table_.insert(std::make_pair(std::make_pair(name_key,
- vnull_key),
- snull));
+ insdefault = this->table_.insert(std::make_pair(std::make_pair(name_key,
+ vnull_key),
+ snull));
}
// ins.first: an iterator, which is a pointer to a pair.
if (parameters->options().gc_sections())
this->gc_mark_dyn_syms(ret);
- if (def)
- this->define_default_version<size, big_endian>(ret, insdef.second,
- insdef.first);
+ if (is_default_version)
+ this->define_default_version<size, big_endian>(ret, insdefault.second,
+ insdefault.first);
}
else
{
// This is the first time we have seen NAME/VERSION.
gold_assert(ins.first->second == NULL);
- if (def && !insdef.second)
+ if (is_default_version && !insdefault.second)
{
// We already have an entry for NAME/NULL. If we override
// it, then change it to NAME/VERSION.
- ret = this->get_sized_symbol<size>(insdef.first->second);
+ ret = this->get_sized_symbol<size>(insdefault.first->second);
was_undefined = ret->is_undefined();
was_common = ret->is_common();
{
// This means that we don't want a symbol table
// entry after all.
- if (!def)
+ if (!is_default_version)
this->table_.erase(ins.first);
else
{
- this->table_.erase(insdef.first);
- // Inserting insdef invalidated ins.
+ this->table_.erase(insdefault.first);
+ // Inserting INSDEFAULT invalidated INS.
this->table_.erase(std::make_pair(name_key,
version_key));
}
ret->init_object(name, version, object, sym, st_shndx, is_ordinary);
ins.first->second = ret;
- if (def)
+ if (is_default_version)
{
// This is the first time we have seen NAME/NULL. Point
// it at the new entry for NAME/VERSION.
- gold_assert(insdef.second);
- insdef.first->second = ret;
+ gold_assert(insdefault.second);
+ insdefault.first->second = ret;
}
}
- if (def)
+ if (is_default_version)
ret->set_is_default();
}
if ((ret->visibility() == elfcpp::STV_HIDDEN
|| ret->visibility() == elfcpp::STV_INTERNAL)
&& (ret->binding() == elfcpp::STB_GLOBAL
+ || ret->binding() == elfcpp::STB_GNU_UNIQUE
|| ret->binding() == elfcpp::STB_WEAK)
&& !parameters->options().relocatable())
this->force_local(ret);
// A symbol defined in a section which we are not including must
// be treated as an undefined symbol.
+ bool is_defined_in_discarded_section = false;
if (st_shndx != elfcpp::SHN_UNDEF
&& is_ordinary
- && !relobj->is_section_included(st_shndx))
- st_shndx = elfcpp::SHN_UNDEF;
+ && !relobj->is_section_included(st_shndx)
+ && !this->is_section_folded(relobj, st_shndx))
+ {
+ st_shndx = elfcpp::SHN_UNDEF;
+ is_defined_in_discarded_section = true;
+ }
// In an object file, an '@' in the name separates the symbol
// name from the version name. If there are two '@' characters,
const char* ver = strchr(name, '@');
Stringpool::Key ver_key = 0;
int namelen = 0;
- // DEF: is the version default? LOCAL: is the symbol forced local?
- bool def = false;
- bool local = false;
+ // IS_DEFAULT_VERSION: is the version default?
+ // IS_FORCED_LOCAL: is the symbol forced local?
+ bool is_default_version = false;
+ bool is_forced_local = false;
if (ver != NULL)
{
++ver;
if (*ver == '@')
{
- def = true;
+ is_default_version = true;
++ver;
}
ver = this->namepool_.add(ver, true, &ver_key);
// The symbol name did not have a version, but the
// version script may assign a version anyway.
std::string version;
- if (this->version_script_.get_symbol_version(name, &version))
+ bool is_global;
+ if (this->version_script_.get_symbol_version(name, &version,
+ &is_global))
{
- // The version can be empty if the version script is
- // only used to force some symbols to be local.
- if (!version.empty())
+ if (!is_global)
+ is_forced_local = true;
+ else if (!version.empty())
{
ver = this->namepool_.add_with_length(version.c_str(),
version.length(),
true,
&ver_key);
- def = true;
+ is_default_version = true;
}
}
- else if (this->version_script_.symbol_is_local(name))
- local = true;
}
}
}
// Fix up visibility if object has no-export set.
- if (relobj->no_export())
+ if (relobj->no_export()
+ && (orig_st_shndx != elfcpp::SHN_UNDEF || !is_ordinary))
{
// We may have copied symbol already above.
if (psym != &sym2)
Sized_symbol<size>* res;
res = this->add_from_object(relobj, name, name_key, ver, ver_key,
- def, *psym, st_shndx, is_ordinary,
- orig_st_shndx);
+ is_default_version, *psym, st_shndx,
+ is_ordinary, orig_st_shndx);
// If building a shared library using garbage collection, do not
// treat externally visible symbols as garbage.
&& parameters->options().shared())
this->gc_mark_symbol_for_shlib(res);
- if (local)
+ if (is_forced_local)
this->force_local(res);
+ if (is_defined_in_discarded_section)
+ res->set_is_defined_in_discarded_section();
+
(*sympointers)[i] = res;
}
}
bool is_ordinary = st_shndx < elfcpp::SHN_LORESERVE;
Stringpool::Key ver_key = 0;
- bool def = false;
- bool local = false;
+ bool is_default_version = false;
+ bool is_forced_local = false;
if (ver != NULL)
{
// The symbol name did not have a version, but the
// version script may assign a version anyway.
std::string version;
- if (this->version_script_.get_symbol_version(name, &version))
+ bool is_global;
+ if (this->version_script_.get_symbol_version(name, &version,
+ &is_global))
{
- // The version can be empty if the version script is
- // only used to force some symbols to be local.
- if (!version.empty())
+ if (!is_global)
+ is_forced_local = true;
+ else if (!version.empty())
{
ver = this->namepool_.add_with_length(version.c_str(),
version.length(),
true,
&ver_key);
- def = true;
+ is_default_version = true;
}
}
- else if (this->version_script_.symbol_is_local(name))
- local = true;
}
}
Sized_symbol<size>* res;
res = this->add_from_object(obj, name, name_key, ver, ver_key,
- def, *sym, st_shndx, is_ordinary, st_shndx);
+ is_default_version, *sym, st_shndx,
+ is_ordinary, st_shndx);
- if (local)
+ if (is_forced_local)
this->force_local(res);
return res;
st_shndx);
else
{
- const bool def = (!hidden
- && st_shndx != elfcpp::SHN_UNDEF);
+ const bool is_default_version =
+ !hidden && st_shndx != elfcpp::SHN_UNDEF;
res = this->add_from_object(dynobj, name, name_key, version,
- version_key, def, *psym, st_shndx,
+ version_key, is_default_version,
+ *psym, st_shndx,
is_ordinary, st_shndx);
}
}
bool is_default_version = false;
if (*pversion == NULL)
{
- if (this->version_script_.get_symbol_version(*pname, &v))
+ bool is_global;
+ if (this->version_script_.get_symbol_version(*pname, &v, &is_global))
{
- if (!v.empty())
- *pversion = v.c_str();
-
- // If we get the version from a version script, then we are
- // also the default version.
- is_default_version = true;
+ if (is_global && !v.empty())
+ {
+ *pversion = v.c_str();
+ // If we get the version from a version script, then we
+ // are also the default version.
+ is_default_version = true;
+ }
}
}
version_key),
snull));
- std::pair<typename Symbol_table_type::iterator, bool> insdef =
+ std::pair<typename Symbol_table_type::iterator, bool> insdefault =
std::make_pair(this->table_.end(), false);
if (is_default_version)
{
const Stringpool::Key vnull = 0;
- insdef = this->table_.insert(std::make_pair(std::make_pair(name_key,
- vnull),
- snull));
+ insdefault =
+ this->table_.insert(std::make_pair(std::make_pair(name_key,
+ vnull),
+ snull));
}
if (!ins.second)
Sized_symbol<size>* soldsym =
this->get_sized_symbol<size>(oldsym);
this->define_default_version<size, big_endian>(soldsym,
- insdef.second,
- insdef.first);
+ insdefault.second,
+ insdefault.first);
}
}
else
add_to_table = true;
add_loc = ins.first;
- if (is_default_version && !insdef.second)
+ if (is_default_version && !insdefault.second)
{
// We are adding NAME/VERSION, and it is the default
// version. We already have an entry for NAME/NULL.
- oldsym = insdef.first->second;
+ oldsym = insdefault.first->second;
*resolve_oldsym = true;
}
else
if (is_default_version)
{
add_def_to_table = true;
- add_def_loc = insdef.first;
+ add_def_loc = insdefault.first;
}
}
}
Symbol*
Symbol_table::define_in_output_data(const char* name,
const char* version,
+ Defined defined,
Output_data* od,
uint64_t value,
uint64_t symsize,
if (parameters->target().get_size() == 32)
{
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
- return this->do_define_in_output_data<32>(name, version, od,
+ return this->do_define_in_output_data<32>(name, version, defined, od,
value, symsize, type, binding,
visibility, nonvis,
offset_is_from_end,
else if (parameters->target().get_size() == 64)
{
#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
- return this->do_define_in_output_data<64>(name, version, od,
+ return this->do_define_in_output_data<64>(name, version, defined, od,
value, symsize, type, binding,
visibility, nonvis,
offset_is_from_end,
Symbol_table::do_define_in_output_data(
const char* name,
const char* version,
+ Defined defined,
Output_data* od,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_WXword symsize,
return sym;
}
- if (Symbol_table::should_override_with_special(oldsym))
+ if (Symbol_table::should_override_with_special(oldsym, defined))
this->override_with_special(oldsym, sym);
if (resolve_oldsym)
Symbol*
Symbol_table::define_in_output_segment(const char* name,
- const char* version, Output_segment* os,
+ const char* version,
+ Defined defined,
+ Output_segment* os,
uint64_t value,
uint64_t symsize,
elfcpp::STT type,
if (parameters->target().get_size() == 32)
{
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
- return this->do_define_in_output_segment<32>(name, version, os,
+ return this->do_define_in_output_segment<32>(name, version, defined, os,
value, symsize, type,
binding, visibility, nonvis,
offset_base, only_if_ref);
else if (parameters->target().get_size() == 64)
{
#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
- return this->do_define_in_output_segment<64>(name, version, os,
+ return this->do_define_in_output_segment<64>(name, version, defined, os,
value, symsize, type,
binding, visibility, nonvis,
offset_base, only_if_ref);
Symbol_table::do_define_in_output_segment(
const char* name,
const char* version,
+ Defined defined,
Output_segment* os,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_WXword symsize,
return sym;
}
- if (Symbol_table::should_override_with_special(oldsym))
+ if (Symbol_table::should_override_with_special(oldsym, defined))
this->override_with_special(oldsym, sym);
if (resolve_oldsym)
Symbol*
Symbol_table::define_as_constant(const char* name,
const char* version,
+ Defined defined,
uint64_t value,
uint64_t symsize,
elfcpp::STT type,
if (parameters->target().get_size() == 32)
{
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
- return this->do_define_as_constant<32>(name, version, value,
+ return this->do_define_as_constant<32>(name, version, defined, value,
symsize, type, binding,
visibility, nonvis, only_if_ref,
force_override);
else if (parameters->target().get_size() == 64)
{
#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
- return this->do_define_as_constant<64>(name, version, value,
+ return this->do_define_as_constant<64>(name, version, defined, value,
symsize, type, binding,
visibility, nonvis, only_if_ref,
force_override);
Symbol_table::do_define_as_constant(
const char* name,
const char* version,
+ Defined defined,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_WXword symsize,
elfcpp::STT type,
return sym;
}
- if (force_override || Symbol_table::should_override_with_special(oldsym))
+ if (force_override
+ || Symbol_table::should_override_with_special(oldsym, defined))
this->override_with_special(oldsym, sym);
if (resolve_oldsym)
{
Output_section* os = layout->find_output_section(p->output_section);
if (os != NULL)
- this->define_in_output_data(p->name, NULL, os, p->value,
+ this->define_in_output_data(p->name, NULL, PREDEFINED, os, p->value,
p->size, p->type, p->binding,
p->visibility, p->nonvis,
p->offset_is_from_end,
only_if_ref || p->only_if_ref);
else
- this->define_as_constant(p->name, NULL, 0, p->size, p->type,
- p->binding, p->visibility, p->nonvis,
+ this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size,
+ p->type, p->binding, p->visibility, p->nonvis,
only_if_ref || p->only_if_ref,
false);
}
p->segment_flags_set,
p->segment_flags_clear);
if (os != NULL)
- this->define_in_output_segment(p->name, NULL, os, p->value,
+ this->define_in_output_segment(p->name, NULL, PREDEFINED, os, p->value,
p->size, p->type, p->binding,
p->visibility, p->nonvis,
p->offset_base,
only_if_ref || p->only_if_ref);
else
- this->define_as_constant(p->name, NULL, 0, p->size, p->type,
- p->binding, p->visibility, p->nonvis,
+ this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size,
+ p->type, p->binding, p->visibility, p->nonvis,
only_if_ref || p->only_if_ref,
false);
}
if (binding == elfcpp::STB_WEAK)
binding = elfcpp::STB_GLOBAL;
- this->define_in_output_data(csym->name(), csym->version(),
+ this->define_in_output_data(csym->name(), csym->version(), COPY,
posd, value, csym->symsize(),
csym->type(), binding,
csym->visibility(), csym->nonvis(),
// some symbols appear more than once in the symbol table, with
// and without a version.
- if (!sym->should_add_dynsym_entry())
+ if (!sym->should_add_dynsym_entry(this))
sym->set_dynsym_index(-1U);
else if (!sym->has_dynsym_index())
{
{
Relobj* relobj = static_cast<Relobj*>(symobj);
Output_section* os = relobj->output_section(shndx);
- uint64_t secoff64 = relobj->output_section_offset(shndx);
if (this->is_section_folded(relobj, shndx))
{
shndx);
gold_assert(folded.first != NULL);
Relobj* folded_obj = reinterpret_cast<Relobj*>(folded.first);
- os = folded_obj->output_section(folded.second);
+ unsigned folded_shndx = folded.second;
+
+ os = folded_obj->output_section(folded_shndx);
gold_assert(os != NULL);
- secoff64 = folded_obj->output_section_offset(folded.second);
+
+ // Replace (relobj, shndx) with canonical ICF input section.
+ shndx = folded_shndx;
+ relobj = folded_obj;
}
+ uint64_t secoff64 = relobj->output_section_offset(shndx);
if (os == NULL)
{
bool static_or_reloc = (parameters->doing_static_link() ||
osym.put_st_size(0);
else
osym.put_st_size(sym->symsize());
+ elfcpp::STT type = sym->type();
+ // Turn IFUNC symbols from shared libraries into normal FUNC symbols.
+ if (type == elfcpp::STT_GNU_IFUNC
+ && sym->is_from_dynobj())
+ type = elfcpp::STT_FUNC;
// A version script may have overridden the default binding.
if (sym->is_forced_local())
- osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, sym->type()));
+ osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, type));
else
- osym.put_st_info(elfcpp::elf_st_info(sym->binding(), sym->type()));
+ osym.put_st_info(elfcpp::elf_st_info(sym->binding(), type));
osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis()));
osym.put_st_shndx(shndx);
}
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