// symtab.cc -- the gold symbol table
-// Copyright (C) 2006-2015 Free Software Foundation, Inc.
+// Copyright (C) 2006-2017 Free Software Foundation, Inc.
// This file is part of gold.
this->undef_binding_set_ = false;
this->undef_binding_weak_ = false;
this->is_predefined_ = false;
+ this->is_protected_ = false;
}
// Return the demangled version of the symbol's name, but only
template<int size>
void
Sized_symbol<size>::init_undefined(const char* name, const char* version,
- elfcpp::STT type, elfcpp::STB binding,
- elfcpp::STV visibility, unsigned char nonvis)
+ Value_type value, elfcpp::STT type,
+ elfcpp::STB binding, elfcpp::STV visibility,
+ unsigned char nonvis)
{
this->init_base_undefined(name, version, type, binding, visibility, nonvis);
- this->value_ = 0;
+ this->value_ = value;
this->symsize_ = 0;
}
: saw_undefined_(0), offset_(0), table_(count), namepool_(),
forwarders_(), commons_(), tls_commons_(), small_commons_(),
large_commons_(), forced_locals_(), warnings_(),
- version_script_(version_script), gc_(NULL), icf_(NULL)
+ version_script_(version_script), gc_(NULL), icf_(NULL),
+ target_symbols_()
{
namepool_.reserve(count);
}
// other is defined in a shared object, then they are different
// symbols.
+ // If the two symbols are from different shared objects,
+ // they are different symbols.
+
// Otherwise, we just resolve the symbols as though they were
// the same.
else if (pdef->second->visibility() != elfcpp::STV_DEFAULT
&& sym->is_from_dynobj())
;
+ else if (pdef->second->is_from_dynobj()
+ && sym->is_from_dynobj()
+ && pdef->second->is_defined()
+ && pdef->second->object() != sym->object())
+ ;
else
{
const Sized_symbol<size>* symdef;
ret = new Sized_symbol<size>();
else
{
- ret = target->make_symbol();
+ ret = target->make_symbol(name, sym.get_st_type(), object,
+ st_shndx, sym.get_st_value());
if (ret == NULL)
{
// This means that we don't want a symbol table
const char* name = sym_names + st_name;
- if (strcmp (name, "__gnu_lto_slim") == 0)
+ if (!parameters->options().relocatable()
+ && strcmp (name, "__gnu_lto_slim") == 0)
gold_info(_("%s: plugin needed to handle lto object"),
relobj->name().c_str());
res = this->add_from_object(relobj, name, name_key, ver, ver_key,
is_default_version, *psym, st_shndx,
is_ordinary, orig_st_shndx);
+
+ if (res == NULL)
+ continue;
if (is_forced_local)
this->force_local(res);
is_default_version, *sym, st_shndx,
is_ordinary, st_shndx);
+ if (res == NULL)
+ return NULL;
+
if (is_forced_local)
this->force_local(res);
// A protected symbol in a shared library must be treated as a
// normal symbol when viewed from outside the shared library.
// Implement this by overriding the visibility here.
+ // Likewise, an IFUNC symbol in a shared library must be treated
+ // as a normal FUNC symbol.
elfcpp::Sym<size, big_endian>* psym = &sym;
unsigned char symbuf[sym_size];
elfcpp::Sym<size, big_endian> sym2(symbuf);
- if (sym.get_st_visibility() == elfcpp::STV_PROTECTED)
+ if (sym.get_st_visibility() == elfcpp::STV_PROTECTED
+ || sym.get_st_type() == elfcpp::STT_GNU_IFUNC)
{
memcpy(symbuf, p, sym_size);
elfcpp::Sym_write<size, big_endian> sw(symbuf);
- sw.put_st_other(elfcpp::STV_DEFAULT, sym.get_st_nonvis());
+ if (sym.get_st_visibility() == elfcpp::STV_PROTECTED)
+ sw.put_st_other(elfcpp::STV_DEFAULT, sym.get_st_nonvis());
+ if (sym.get_st_type() == elfcpp::STT_GNU_IFUNC)
+ sw.put_st_info(sym.get_st_bind(), elfcpp::STT_FUNC);
psym = &sym2;
}
}
}
+ if (res == NULL)
+ continue;
+
// Note that it is possible that RES was overridden by an
// earlier object, in which case it can't be aliased here.
if (st_shndx != elfcpp::SHN_UNDEF
&& res->object() == dynobj)
object_symbols.push_back(res);
+ // If the symbol has protected visibility in the dynobj,
+ // mark it as such if it was not overridden.
+ if (res->source() == Symbol::FROM_OBJECT
+ && res->object() == dynobj
+ && sym.get_st_visibility() == elfcpp::STV_PROTECTED)
+ res->set_is_protected();
+
if (sympointers != NULL)
(*sympointers)[i] = res;
}
Stringpool::Key ver_key = 0;
bool is_default_version = false;
- bool is_forced_local = false;
Stringpool::Key name_key;
name = this->namepool_.add(name, true, &name_key);
is_default_version, *sym, st_shndx,
is_ordinary, st_shndx);
- if (is_forced_local)
- this->force_local(res);
-
return res;
}
Symbol_table::define_special_symbol(const char** pname, const char** pversion,
bool only_if_ref,
Sized_symbol<size>** poldsym,
- bool* resolve_oldsym)
+ bool* resolve_oldsym, bool is_forced_local)
{
*resolve_oldsym = false;
*poldsym = NULL;
// the version script.
std::string v;
bool is_default_version = false;
- if (*pversion == NULL)
+ if (!is_forced_local && *pversion == NULL)
{
bool is_global;
if (this->version_script_.get_symbol_version(*pname, &v, &is_global))
{
Sized_target<size, big_endian>* sized_target =
parameters->sized_target<size, big_endian>();
- sym = sized_target->make_symbol();
+ sym = sized_target->make_symbol(*pname, elfcpp::STT_NOTYPE,
+ NULL, elfcpp::SHN_UNDEF, 0);
if (sym == NULL)
return NULL;
}
Sized_symbol<size>* sym;
Sized_symbol<size>* oldsym;
bool resolve_oldsym;
+ const bool is_forced_local = binding == elfcpp::STB_LOCAL;
if (parameters->target().is_big_endian())
{
#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
sym = this->define_special_symbol<size, true>(&name, &version,
only_if_ref, &oldsym,
- &resolve_oldsym);
+ &resolve_oldsym,
+ is_forced_local);
#else
gold_unreachable();
#endif
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
sym = this->define_special_symbol<size, false>(&name, &version,
only_if_ref, &oldsym,
- &resolve_oldsym);
+ &resolve_oldsym,
+ is_forced_local);
#else
gold_unreachable();
#endif
if (oldsym == NULL)
{
- if (binding == elfcpp::STB_LOCAL
- || this->version_script_.symbol_is_local(name))
+ if (is_forced_local || this->version_script_.symbol_is_local(name))
this->force_local(sym);
else if (version != NULL)
sym->set_is_default();
return sym;
else
{
- if (binding == elfcpp::STB_LOCAL
- || this->version_script_.symbol_is_local(name))
+ if (defined == PREDEFINED
+ && (is_forced_local || this->version_script_.symbol_is_local(name)))
this->force_local(oldsym);
delete sym;
return oldsym;
Sized_symbol<size>* sym;
Sized_symbol<size>* oldsym;
bool resolve_oldsym;
+ const bool is_forced_local = binding == elfcpp::STB_LOCAL;
if (parameters->target().is_big_endian())
{
#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
sym = this->define_special_symbol<size, true>(&name, &version,
only_if_ref, &oldsym,
- &resolve_oldsym);
+ &resolve_oldsym,
+ is_forced_local);
#else
gold_unreachable();
#endif
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
sym = this->define_special_symbol<size, false>(&name, &version,
only_if_ref, &oldsym,
- &resolve_oldsym);
+ &resolve_oldsym,
+ is_forced_local);
#else
gold_unreachable();
#endif
if (oldsym == NULL)
{
- if (binding == elfcpp::STB_LOCAL
- || this->version_script_.symbol_is_local(name))
+ if (is_forced_local || this->version_script_.symbol_is_local(name))
this->force_local(sym);
else if (version != NULL)
sym->set_is_default();
return sym;
else
{
- if (binding == elfcpp::STB_LOCAL
- || this->version_script_.symbol_is_local(name))
+ if (is_forced_local || this->version_script_.symbol_is_local(name))
this->force_local(oldsym);
delete sym;
return oldsym;
Sized_symbol<size>* sym;
Sized_symbol<size>* oldsym;
bool resolve_oldsym;
+ const bool is_forced_local = binding == elfcpp::STB_LOCAL;
if (parameters->target().is_big_endian())
{
#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
sym = this->define_special_symbol<size, true>(&name, &version,
only_if_ref, &oldsym,
- &resolve_oldsym);
+ &resolve_oldsym,
+ is_forced_local);
#else
gold_unreachable();
#endif
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
sym = this->define_special_symbol<size, false>(&name, &version,
only_if_ref, &oldsym,
- &resolve_oldsym);
+ &resolve_oldsym,
+ is_forced_local);
#else
gold_unreachable();
#endif
if ((version == NULL
|| name != version
|| value != 0)
- && (binding == elfcpp::STB_LOCAL
- || this->version_script_.symbol_is_local(name)))
+ && (is_forced_local || this->version_script_.symbol_is_local(name)))
this->force_local(sym);
else if (version != NULL
&& (name != version || value != 0))
return sym;
else
{
- if (binding == elfcpp::STB_LOCAL
- || this->version_script_.symbol_is_local(name))
+ if (is_forced_local || this->version_script_.symbol_is_local(name))
this->force_local(oldsym);
delete sym;
return oldsym;
#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
sym = this->define_special_symbol<size, true>(&name, &version,
false, &oldsym,
- &resolve_oldsym);
+ &resolve_oldsym,
+ false);
#else
gold_unreachable();
#endif
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
sym = this->define_special_symbol<size, false>(&name, &version,
false, &oldsym,
- &resolve_oldsym);
+ &resolve_oldsym,
+ false);
#else
gold_unreachable();
#endif
gold_assert(oldsym == NULL);
- sym->init_undefined(name, version, elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
+ sym->init_undefined(name, version, 0, elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
elfcpp::STV_DEFAULT, 0);
++this->saw_undefined_;
}
// Set the dynamic symbol indexes. INDEX is the index of the first
-// global dynamic symbol. Pointers to the symbols are stored into the
-// vector SYMS. The names are added to DYNPOOL. This returns an
-// updated dynamic symbol index.
+// global dynamic symbol. Pointers to the global symbols are stored
+// into the vector SYMS. The names are added to DYNPOOL.
+// This returns an updated dynamic symbol index.
unsigned int
Symbol_table::set_dynsym_indexes(unsigned int index,
+ unsigned int* pforced_local_count,
std::vector<Symbol*>* syms,
Stringpool* dynpool,
Versions* versions)
{
std::vector<Symbol*> as_needed_sym;
+ // First process all the symbols which have been forced to be local,
+ // as they must appear before all global symbols.
+ unsigned int forced_local_count = 0;
+ for (Forced_locals::iterator p = this->forced_locals_.begin();
+ p != this->forced_locals_.end();
+ ++p)
+ {
+ Symbol* sym = *p;
+ gold_assert(sym->is_forced_local());
+ if (sym->has_dynsym_index())
+ continue;
+ if (!sym->should_add_dynsym_entry(this))
+ sym->set_dynsym_index(-1U);
+ else
+ {
+ sym->set_dynsym_index(index);
+ ++index;
+ ++forced_local_count;
+ dynpool->add(sym->name(), false, NULL);
+ }
+ }
+ *pforced_local_count = forced_local_count;
+
// Allow a target to set dynsym indexes.
if (parameters->target().has_custom_set_dynsym_indexes())
{
++p)
{
Symbol* sym = p->second;
+ if (sym->is_forced_local())
+ continue;
if (!sym->should_add_dynsym_entry(this))
sym->set_dynsym_index(-1U);
else
{
Symbol* sym = p->second;
+ if (sym->is_forced_local())
+ continue;
+
// 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.
// symbols.
index = versions->finalize(this, index, syms);
+ // Process target-specific symbols.
+ for (std::vector<Symbol*>::iterator p = this->target_symbols_.begin();
+ p != this->target_symbols_.end();
+ ++p)
+ {
+ (*p)->set_dynsym_index(index);
+ ++index;
+ syms->push_back(*p);
+ dynpool->add((*p)->name(), false, NULL);
+ }
+
return index;
}
// Set the final values for all the symbols. The index of the first
// global symbol in the output file is *PLOCAL_SYMCOUNT. Record the
// file offset OFF. Add their names to POOL. Return the new file
-// offset. Update *PLOCAL_SYMCOUNT if necessary.
+// offset. Update *PLOCAL_SYMCOUNT if necessary. DYNOFF and
+// DYN_GLOBAL_INDEX refer to the start of the symbols that will be
+// written from the global symbol table in Symtab::write_globals(),
+// which will include forced-local symbols. DYN_GLOBAL_INDEX is
+// not necessarily the same as the sh_info field for the .dynsym
+// section, which will point to the first real global symbol.
off_t
Symbol_table::finalize(off_t off, off_t dynoff, size_t dyn_global_index,
this->add_to_final_symtab<size>(sym, pool, &index, &off);
}
+ // Now do target-specific symbols.
+ for (std::vector<Symbol*>::iterator p = this->target_symbols_.begin();
+ p != this->target_symbols_.end();
+ ++p)
+ {
+ this->add_to_final_symtab<size>(*p, pool, &index, &off);
+ }
+
this->output_count_ = index - orig_index;
return off;
// In object files symbol values are section
// relative.
if (parameters->options().relocatable())
- sym_value -= od->address();
+ {
+ Output_section* os = od->output_section();
+ gold_assert(os != NULL);
+ sym_value -= os->address();
+ }
}
break;
case Symbol::IN_OUTPUT_SEGMENT:
- shndx = elfcpp::SHN_ABS;
+ {
+ Output_segment* oseg = sym->output_segment();
+ Output_section* osect = oseg->first_section();
+ if (osect == NULL)
+ shndx = elfcpp::SHN_ABS;
+ else
+ shndx = osect->out_shndx();
+ }
break;
case Symbol::IS_CONSTANT:
}
}
+ // Write the target-specific symbols.
+ for (std::vector<Symbol*>::const_iterator p = this->target_symbols_.begin();
+ p != this->target_symbols_.end();
+ ++p)
+ {
+ Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(*p);
+
+ unsigned int sym_index = sym->symtab_index();
+ unsigned int dynsym_index;
+ if (dynamic_view == NULL)
+ dynsym_index = -1U;
+ else
+ dynsym_index = sym->dynsym_index();
+
+ unsigned int shndx;
+ switch (sym->source())
+ {
+ case Symbol::IS_CONSTANT:
+ shndx = elfcpp::SHN_ABS;
+ break;
+ case Symbol::IS_UNDEFINED:
+ shndx = elfcpp::SHN_UNDEF;
+ break;
+ default:
+ gold_unreachable();
+ }
+
+ if (sym_index != -1U)
+ {
+ sym_index -= first_global_index;
+ gold_assert(sym_index < output_count);
+ unsigned char* ps = psyms + (sym_index * sym_size);
+ this->sized_write_symbol<size, big_endian>(sym, sym->value(), shndx,
+ sym->binding(), sympool,
+ ps);
+ }
+
+ if (dynsym_index != -1U)
+ {
+ dynsym_index -= first_dynamic_global_index;
+ gold_assert(dynsym_index < dynamic_count);
+ unsigned char* pd = dynamic_view + (dynsym_index * sym_size);
+ this->sized_write_symbol<size, big_endian>(sym, sym->value(), shndx,
+ sym->binding(), dynpool,
+ pd);
+ }
+ }
+
of->write_output_view(this->offset_, oview_size, psyms);
if (dynamic_view != NULL)
of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view);
unsigned char nonvis,
bool offset_is_from_end,
bool is_predefined);
+
+template
+void
+Sized_symbol<32>::init_constant(const char* name, const char* version,
+ Value_type value, Size_type symsize,
+ elfcpp::STT type, elfcpp::STB binding,
+ elfcpp::STV visibility, unsigned char nonvis,
+ bool is_predefined);
+
+template
+void
+Sized_symbol<32>::init_undefined(const char* name, const char* version,
+ Value_type value, elfcpp::STT type,
+ elfcpp::STB binding, elfcpp::STV visibility,
+ unsigned char nonvis);
#endif
#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
unsigned char nonvis,
bool offset_is_from_end,
bool is_predefined);
+
+template
+void
+Sized_symbol<64>::init_constant(const char* name, const char* version,
+ Value_type value, Size_type symsize,
+ elfcpp::STT type, elfcpp::STB binding,
+ elfcpp::STV visibility, unsigned char nonvis,
+ bool is_predefined);
+
+template
+void
+Sized_symbol<64>::init_undefined(const char* name, const char* version,
+ Value_type value, elfcpp::STT type,
+ elfcpp::STB binding, elfcpp::STV visibility,
+ unsigned char nonvis);
#endif
#ifdef HAVE_TARGET_32_LITTLE
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