// 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 <string>
#include <utility>
#include "object.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->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;
}
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;
}
// Initialize the fields in Sized_symbol for SYM in OBJECT.
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());
+ Symbol_table::resolve(to, 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
// 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);
+ Symbol_table::resolve(ret, 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);
+ Symbol_table::resolve(ret, 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,
if (this->get_size() == 0)
this->set_size(size);
- if (size != this->get_size() || size != object->target()->get_size())
+ if (size != this->get_size() || size != relobj->target()->get_size())
{
fprintf(stderr, _("%s: %s: mixing 32-bit and 64-bit ELF objects\n"),
- program_name, object->name().c_str());
+ program_name, relobj->name().c_str());
gold_exit(false);
}
{
fprintf(stderr,
_("%s: %s: bad global symbol name offset %u at %lu\n"),
- program_name, object->name().c_str(), st_name,
+ program_name, relobj->name().c_str(), st_name,
static_cast<unsigned long>(i));
gold_exit(false);
}
+ 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.
{
Stringpool::Key name_key;
name = this->namepool_.add(name, &name_key);
- res = this->add_from_object(object, name, name_key, NULL, 0,
+ res = this->add_from_object(relobj, name, name_key, NULL, 0,
false, *psym);
}
else
Stringpool::Key ver_key;
ver = this->namepool_.add(ver, &ver_key);
- res = this->add_from_object(object, name, name_key, ver, ver_key,
+ res = this->add_from_object(relobj, name, name_key, ver, ver_key,
def, *psym);
}
}
}
+// 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)
+{
+ // 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 != dynobj->target()->get_size())
+ {
+ fprintf(stderr, _("%s: %s: mixing 32-bit and 64-bit ELF objects\n"),
+ program_name, dynobj->name().c_str());
+ gold_exit(false);
+ }
+
+ if (versym != NULL && versym_size / 2 < count)
+ {
+ fprintf(stderr, _("%s: %s: too few symbol versions\n"),
+ program_name, dynobj->name().c_str());
+ gold_exit(false);
+ }
+
+ const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
+
+ const unsigned char* p = syms;
+ const unsigned char* vs = versym;
+ for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2)
+ {
+ elfcpp::Sym<size, big_endian> sym(p);
+
+ // Ignore symbols with local binding.
+ if (sym.get_st_bind() == elfcpp::STB_LOCAL)
+ continue;
+
+ unsigned int st_name = sym.get_st_name();
+ if (st_name >= sym_name_size)
+ {
+ fprintf(stderr, _("%s: %s: bad symbol name offset %u at %lu\n"),
+ program_name, dynobj->name().c_str(), st_name,
+ static_cast<unsigned long>(i));
+ gold_exit(false);
+ }
+
+ const char* name = sym_names + st_name;
+
+ if (versym == NULL)
+ {
+ Stringpool::Key name_key;
+ name = this->namepool_.add(name, &name_key);
+ this->add_from_object(dynobj, name, name_key, NULL, 0,
+ false, sym);
+ continue;
+ }
+
+ // 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, &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.
+ this->add_from_object(dynobj, name, name_key, NULL, 0, false, sym);
+ continue;
+ }
+
+ if (v >= version_map->size())
+ {
+ fprintf(stderr,
+ _("%s: %s: versym for symbol %zu out of range: %u\n"),
+ program_name, dynobj->name().c_str(), i, v);
+ gold_exit(false);
+ }
+
+ const char* version = (*version_map)[v];
+ if (version == NULL)
+ {
+ fprintf(stderr, _("%s: %s: versym for symbol %zu has no name: %u\n"),
+ program_name, dynobj->name().c_str(), i, v);
+ gold_exit(false);
+ }
+
+ Stringpool::Key version_key;
+ version = this->namepool_.add(version, &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)
+ {
+ this->add_from_object(dynobj, name, name_key, NULL, 0, false, sym);
+ continue;
+ }
+
+ const bool def = !hidden && sym.get_st_shndx() != elfcpp::SHN_UNDEF;
+
+ this->add_from_object(dynobj, name, name_key, version, version_key,
+ def, sym);
+ }
+}
+
// 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);
+ gold_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, &name_key);
+
+ Stringpool::Key version_key = 0;
+ if (*pversion != NULL)
+ *pversion = this->namepool_.add(*pversion, &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_);
+ gold_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);
+ {
+#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 (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 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 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))
+ oldsym->override_with_special(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_);
+ gold_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);
+ {
+#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 (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 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
+ target, &name, &version, only_if_ref, &oldsym
SELECT_SIZE_ENDIAN(size, true));
else
sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) (
- target, name, only_if_ref
+ target, &name, &version, only_if_ref, &oldsym
SELECT_SIZE_ENDIAN(size, false));
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))
+ oldsym->override_with_special(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_);
+ gold_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);
+ {
+#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 (this->size_ == 64)
- this->do_define_as_constant<64>(target, name, value, symsize,
- type, binding, visibility, nonvis,
- only_if_ref);
+ {
+#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
+ target, &name, &version, only_if_ref, &oldsym
SELECT_SIZE_ENDIAN(size, true));
else
sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) (
- target, name, only_if_ref
+ target, &name, &version, only_if_ref, &oldsym
SELECT_SIZE_ENDIAN(size, false));
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))
+ oldsym->override_with_special(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
+// 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 General_options* options,
+ 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->needs_dynsym_entry()
+ && (!options->export_dynamic()
+ || !sym->in_reg()
+ || !sym->is_externally_visible()))
+ 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(), NULL);
+
+ // Record any version information.
+ if (sym->version() != NULL)
+ versions->record_version(options, 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;
+ 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 (this->size_ == 32)
- ret = this->sized_finalize<32>(off, pool);
+ ret = this->sized_finalize<32>(index, off, pool);
else if (this->size_ == 64)
- ret = this->sized_finalize<64>(off, pool);
+ ret = this->sized_finalize<64>(index, off, pool);
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);
+ program_name, sym->name(), shndx);
gold_exit(false);
}
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);
+ sym->set_symtab_index(index);
pool->add(sym->name(), NULL);
- ++count;
+ ++index;
off += sym_size;
- ++p;
}
- this->output_count_ = count;
+ this->output_count_ = index - orig_index;
return off;
}
void
Symbol_table::write_globals(const Target* target, const Stringpool* sympool,
- Output_file* of) const
+ const Stringpool* dynpool, Output_file* of) const
{
if (this->size_ == 32)
{
if (target->is_big_endian())
- this->sized_write_globals<32, true>(target, sympool, of);
+ this->sized_write_globals<32, true>(target, sympool, dynpool, of);
else
- this->sized_write_globals<32, false>(target, sympool, of);
+ this->sized_write_globals<32, false>(target, sympool, dynpool, of);
}
else if (this->size_ == 64)
{
if (target->is_big_endian())
- this->sized_write_globals<64, true>(target, sympool, of);
+ this->sized_write_globals<64, true>(target, sympool, dynpool, of);
else
- this->sized_write_globals<64, false>(target, sympool, of);
+ this->sized_write_globals<64, false>(target, sympool, dynpool, of);
}
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 Target* target,
const Stringpool* sympool,
+ const Stringpool* dynpool,
Output_file* of) const
{
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);
+ 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());
+ program_name, sym->name(), in_shndx);
gold_exit(false);
}
Object* symobj = sym->object();
if (symobj->is_dynamic())
{
- // FIXME.
+ if (sym->needs_dynsym_value())
+ value = target->dynsym_value(sym);
shndx = elfcpp::SHN_UNDEF;
}
- else if (shnum == elfcpp::SHN_UNDEF || shnum == elfcpp::SHN_ABS)
- shndx = shnum;
+ 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(shnum, &secoff);
- if (os == NULL)
- continue;
-
+ Output_section* os = relobj->output_section(in_shndx, &secoff);
+ gold_assert(os != NULL);
shndx = os->out_shndx();
}
}
break;
default:
- abort();
+ gold_unreachable();
+ }
+
+ if (sym_index != -1U)
+ {
+ this->sized_write_symbol SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
+ sym, sym->value(), shndx, sympool, ps
+ SELECT_SIZE_ENDIAN(size, big_endian));
+ ps += sym_size;
+ }
+
+ if (dynsym_index != -1U)
+ {
+ dynsym_index -= first_dynamic_global_index;
+ gold_assert(dynsym_index < dynamic_count);
+ unsigned char* pd = dynamic_view + (dynsym_index * sym_size);
+ this->sized_write_symbol SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
+ sym, value, shndx, dynpool, pd
+ SELECT_SIZE_ENDIAN(size, big_endian));
}
+ }
+
+ gold_assert(ps - psyms == oview_size);
+
+ of->write_output_view(this->offset_, oview_size, psyms);
+ if (dynamic_view != NULL)
+ of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view);
+}
- 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);
+// Write out the symbol SYM, in section SHNDX, to P. POOL is the
+// strtab holding the name.
- ps += sym_size;
+template<int size, bool big_endian>
+void
+Symbol_table::sized_write_symbol(
+ Sized_symbol<size>* sym,
+ typename elfcpp::Elf_types<size>::Elf_Addr value,
+ unsigned int shndx,
+ const Stringpool* pool,
+ unsigned char* p
+ ACCEPT_SIZE_ENDIAN) const
+{
+ elfcpp::Sym_write<size, big_endian> osym(p);
+ osym.put_st_name(pool->get_offset(sym->name()));
+ osym.put_st_value(value);
+ osym.put_st_size(sym->symsize());
+ osym.put_st_info(elfcpp::elf_st_info(sym->binding(), sym->type()));
+ osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis()));
+ osym.put_st_shndx(shndx);
+}
+
+// Write out a section symbol. Return the update offset.
+
+void
+Symbol_table::write_section_symbol(const Target* target,
+ const Output_section *os,
+ Output_file* of,
+ off_t offset) const
+{
+ if (this->size_ == 32)
+ {
+ if (target->is_big_endian())
+ this->sized_write_section_symbol<32, true>(os, of, offset);
+ else
+ this->sized_write_section_symbol<32, false>(os, of, offset);
+ }
+ else if (this->size_ == 64)
+ {
+ if (target->is_big_endian())
+ this->sized_write_section_symbol<64, true>(os, of, offset);
+ else
+ this->sized_write_section_symbol<64, false>(os, of, offset);
}
+ 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;
- of->write_output_view(this->offset_, this->output_count_ * sym_size, psyms);
+ 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);
}
// Warnings functions.
// symbol for which has a warning.
void
-Warnings::issue_warning(Symbol* sym, const std::string& location) const
+Warnings::issue_warning(const Symbol* sym, const std::string& location) 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());
+ gold_assert(p != this->warnings_.end());
fprintf(stderr, _("%s: %s: warning: %s\n"), program_name, location.c_str(),
p->second.text.c_str());
}
// script to restrict this to only the ones needed for implemented
// targets.
+#ifdef HAVE_TARGET_32_LITTLE
template
void
-Symbol_table::add_from_object<32, true>(
- Relobj* object,
+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);
+#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);
+#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);
+#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);
+#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
} // End namespace gold.
projects / deliverable / binutils-gdb.git / blobdiff