// symtab.cc -- the gold symbol table
-// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
+// Copyright (C) 2006-2017 Free Software Foundation, Inc.
// This file is part of gold.
#include <utility>
#include "demangle.h"
+#include "gc.h"
#include "object.h"
#include "dwarf_reader.h"
#include "dynobj.h"
#include "target.h"
#include "workqueue.h"
#include "symtab.h"
+#include "script.h"
#include "plugin.h"
+#include "incremental.h"
namespace 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;
+ 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
Symbol::init_base_output_data(const char* name, const char* version,
Output_data* od, elfcpp::STT type,
elfcpp::STB binding, elfcpp::STV visibility,
- unsigned char nonvis, bool offset_is_from_end)
+ unsigned char nonvis, bool offset_is_from_end,
+ bool is_predefined)
{
this->init_fields(name, version, type, binding, visibility, nonvis);
this->u_.in_output_data.output_data = od;
this->source_ = IN_OUTPUT_DATA;
this->in_reg_ = true;
this->in_real_elf_ = true;
+ this->is_predefined_ = is_predefined;
}
// Initialize the fields in the base class Symbol for a symbol defined
Output_segment* os, elfcpp::STT type,
elfcpp::STB binding, elfcpp::STV visibility,
unsigned char nonvis,
- Segment_offset_base offset_base)
+ Segment_offset_base offset_base,
+ bool is_predefined)
{
this->init_fields(name, version, type, binding, visibility, nonvis);
this->u_.in_output_segment.output_segment = os;
this->source_ = IN_OUTPUT_SEGMENT;
this->in_reg_ = true;
this->in_real_elf_ = true;
+ this->is_predefined_ = is_predefined;
}
// Initialize the fields in the base class Symbol for a symbol defined
void
Symbol::init_base_constant(const char* name, const char* version,
elfcpp::STT type, elfcpp::STB binding,
- elfcpp::STV visibility, unsigned char nonvis)
+ elfcpp::STV visibility, unsigned char nonvis,
+ bool is_predefined)
{
this->init_fields(name, version, type, binding, visibility, nonvis);
this->source_ = IS_CONSTANT;
this->in_reg_ = true;
this->in_real_elf_ = true;
+ this->is_predefined_ = is_predefined;
}
// Initialize the fields in the base class Symbol for an undefined
elfcpp::STB binding,
elfcpp::STV visibility,
unsigned char nonvis,
- bool offset_is_from_end)
+ bool offset_is_from_end,
+ bool is_predefined)
{
this->init_base_output_data(name, version, od, type, binding, visibility,
- nonvis, offset_is_from_end);
+ nonvis, offset_is_from_end, is_predefined);
this->value_ = value;
this->symsize_ = symsize;
}
elfcpp::STB binding,
elfcpp::STV visibility,
unsigned char nonvis,
- Segment_offset_base offset_base)
+ Segment_offset_base offset_base,
+ bool is_predefined)
{
this->init_base_output_segment(name, version, os, type, binding, visibility,
- nonvis, offset_base);
+ nonvis, offset_base, is_predefined);
this->value_ = value;
this->symsize_ = symsize;
}
Sized_symbol<size>::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)
+ elfcpp::STV visibility, unsigned char nonvis,
+ bool is_predefined)
{
- this->init_base_constant(name, version, type, binding, visibility, nonvis);
+ this->init_base_constant(name, version, type, binding, visibility, nonvis,
+ is_predefined);
this->value_ = value;
this->symsize_ = symsize;
}
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;
}
+// Return an allocated string holding the symbol's name as
+// name@version. This is used for relocatable links.
+
+std::string
+Symbol::versioned_name() const
+{
+ gold_assert(this->version_ != NULL);
+ std::string ret = this->name_;
+ ret.push_back('@');
+ if (this->is_def_)
+ ret.push_back('@');
+ ret += this->version_;
+ return ret;
+}
+
+// Return true if SHNDX represents a common symbol.
+
+bool
+Symbol::is_common_shndx(unsigned int shndx)
+{
+ return (shndx == elfcpp::SHN_COMMON
+ || shndx == parameters->target().small_common_shndx()
+ || shndx == parameters->target().large_common_shndx());
+}
+
// Allocate a common symbol.
template<int size>
this->value_ = value;
}
+// The ""'s around str ensure str is a string literal, so sizeof works.
+#define strprefix(var, str) (strncmp(var, str, sizeof("" str "") - 1) == 0)
+
// Return true if this symbol should be added to the dynamic symbol
// table.
-inline bool
-Symbol::should_add_dynsym_entry() const
+bool
+Symbol::should_add_dynsym_entry(Symbol_table* symtab) const
{
+ // If the symbol is only present on plugin files, the plugin decided we
+ // don't need it.
+ if (!this->in_real_elf())
+ return false;
+
// If the symbol is used by a dynamic relocation, we need to add it.
if (this->needs_dynsym_entry())
return true;
+ // If this symbol's section is not added, the symbol need not be added.
+ // The section may have been GCed. Note that export_dynamic is being
+ // overridden here. This should not be done for shared objects.
+ if (parameters->options().gc_sections()
+ && !parameters->options().shared()
+ && this->source() == Symbol::FROM_OBJECT
+ && !this->object()->is_dynamic())
+ {
+ Relobj* relobj = static_cast<Relobj*>(this->object());
+ bool is_ordinary;
+ unsigned int shndx = this->shndx(&is_ordinary);
+ if (is_ordinary && shndx != elfcpp::SHN_UNDEF
+ && !relobj->is_section_included(shndx)
+ && !symtab->is_section_folded(relobj, shndx))
+ return false;
+ }
+
+ // If the symbol was forced dynamic in a --dynamic-list file
+ // or an --export-dynamic-symbol option, add it.
+ if (!this->is_from_dynobj()
+ && (parameters->options().in_dynamic_list(this->name())
+ || parameters->options().is_export_dynamic_symbol(this->name())))
+ {
+ if (!this->is_forced_local())
+ return true;
+ gold_warning(_("Cannot export local symbol '%s'"),
+ this->demangled_name().c_str());
+ return false;
+ }
+
// If the symbol was forced local in a version script, do not add it.
if (this->is_forced_local())
return false;
+ // If dynamic-list-data was specified, add any STT_OBJECT.
+ if (parameters->options().dynamic_list_data()
+ && !this->is_from_dynobj()
+ && this->type() == elfcpp::STT_OBJECT)
+ return true;
+
+ // If --dynamic-list-cpp-new was specified, add any new/delete symbol.
+ // If --dynamic-list-cpp-typeinfo was specified, add any typeinfo symbols.
+ if ((parameters->options().dynamic_list_cpp_new()
+ || parameters->options().dynamic_list_cpp_typeinfo())
+ && !this->is_from_dynobj())
+ {
+ // TODO(csilvers): We could probably figure out if we're an operator
+ // new/delete or typeinfo without the need to demangle.
+ char* demangled_name = cplus_demangle(this->name(),
+ DMGL_ANSI | DMGL_PARAMS);
+ if (demangled_name == NULL)
+ {
+ // Not a C++ symbol, so it can't satisfy these flags
+ }
+ else if (parameters->options().dynamic_list_cpp_new()
+ && (strprefix(demangled_name, "operator new")
+ || strprefix(demangled_name, "operator delete")))
+ {
+ free(demangled_name);
+ return true;
+ }
+ else if (parameters->options().dynamic_list_cpp_typeinfo()
+ && (strprefix(demangled_name, "typeinfo name for")
+ || strprefix(demangled_name, "typeinfo for")))
+ {
+ free(demangled_name);
+ return true;
+ }
+ else
+ free(demangled_name);
+ }
+
// If exporting all symbols or building a shared library,
+ // or the symbol should be globally unique (GNU_UNIQUE),
// and the symbol is defined in a regular object and is
// externally visible, we need to add it.
- if ((parameters->options().export_dynamic() || parameters->options().shared())
+ if ((parameters->options().export_dynamic()
+ || parameters->options().shared()
+ || (parameters->options().gnu_unique()
+ && this->binding() == elfcpp::STB_GNU_UNIQUE))
&& !this->is_from_dynobj()
+ && !this->is_undefined()
&& this->is_externally_visible())
return true;
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->options().shared() || parameters->options().relocatable())
+ // known, since they will change at runtime, with the exception of
+ // TLS symbols in a position-independent executable.
+ if ((parameters->options().output_is_position_independent()
+ || parameters->options().relocatable())
+ && !(this->type() == elfcpp::STT_TLS
+ && parameters->options().pie()))
return false;
// If the symbol is not from an object file, and is not undefined,
}
}
+// Set the symbol's output segment. This is used for pre-defined
+// symbols whose segments aren't known until after layout is done
+// (e.g., __ehdr_start).
+
+void
+Symbol::set_output_segment(Output_segment* os, Segment_offset_base base)
+{
+ gold_assert(this->is_predefined_);
+ this->source_ = IN_OUTPUT_SEGMENT;
+ this->u_.in_output_segment.output_segment = os;
+ this->u_.in_output_segment.offset_base = base;
+}
+
+// Set the symbol to undefined. This is used for pre-defined
+// symbols whose segments aren't known until after layout is done
+// (e.g., __ehdr_start).
+
+void
+Symbol::set_undefined()
+{
+ this->source_ = IS_UNDEFINED;
+ this->is_predefined_ = false;
+}
+
// Class Symbol_table.
Symbol_table::Symbol_table(unsigned int count,
const Version_script_info& version_script)
: saw_undefined_(0), offset_(0), table_(count), namepool_(),
- forwarders_(), commons_(), tls_commons_(), forced_locals_(), warnings_(),
- version_script_(version_script)
+ forwarders_(), commons_(), tls_commons_(), small_commons_(),
+ large_commons_(), forced_locals_(), warnings_(),
+ version_script_(version_script), gc_(NULL), icf_(NULL),
+ target_symbols_()
{
namepool_.reserve(count);
}
{
}
-// The hash function. The key values are Stringpool keys.
-
-inline size_t
-Symbol_table::Symbol_table_hash::operator()(const Symbol_table_key& key) const
-{
- return key.first ^ key.second;
-}
-
// The symbol table key equality function. This is called with
// Stringpool keys.
return k1.first == k2.first && k1.second == k2.second;
}
+bool
+Symbol_table::is_section_folded(Relobj* obj, unsigned int shndx) const
+{
+ return (parameters->options().icf_enabled()
+ && this->icf_->is_section_folded(obj, shndx));
+}
+
+// For symbols that have been listed with a -u or --export-dynamic-symbol
+// option, add them to the work list to avoid gc'ing them.
+
+void
+Symbol_table::gc_mark_undef_symbols(Layout* layout)
+{
+ for (options::String_set::const_iterator p =
+ parameters->options().undefined_begin();
+ p != parameters->options().undefined_end();
+ ++p)
+ {
+ const char* name = p->c_str();
+ Symbol* sym = this->lookup(name);
+ gold_assert(sym != NULL);
+ if (sym->source() == Symbol::FROM_OBJECT
+ && !sym->object()->is_dynamic())
+ {
+ this->gc_mark_symbol(sym);
+ }
+ }
+
+ for (options::String_set::const_iterator p =
+ parameters->options().export_dynamic_symbol_begin();
+ p != parameters->options().export_dynamic_symbol_end();
+ ++p)
+ {
+ const char* name = p->c_str();
+ Symbol* sym = this->lookup(name);
+ // It's not an error if a symbol named by --export-dynamic-symbol
+ // is undefined.
+ if (sym != NULL
+ && sym->source() == Symbol::FROM_OBJECT
+ && !sym->object()->is_dynamic())
+ {
+ this->gc_mark_symbol(sym);
+ }
+ }
+
+ for (Script_options::referenced_const_iterator p =
+ layout->script_options()->referenced_begin();
+ p != layout->script_options()->referenced_end();
+ ++p)
+ {
+ Symbol* sym = this->lookup(p->c_str());
+ gold_assert(sym != NULL);
+ if (sym->source() == Symbol::FROM_OBJECT
+ && !sym->object()->is_dynamic())
+ {
+ this->gc_mark_symbol(sym);
+ }
+ }
+}
+
+void
+Symbol_table::gc_mark_symbol(Symbol* sym)
+{
+ // Add the object and section to the work list.
+ bool is_ordinary;
+ unsigned int shndx = sym->shndx(&is_ordinary);
+ if (is_ordinary && shndx != elfcpp::SHN_UNDEF && !sym->object()->is_dynamic())
+ {
+ gold_assert(this->gc_!= NULL);
+ Relobj* relobj = static_cast<Relobj*>(sym->object());
+ this->gc_->worklist().push_back(Section_id(relobj, shndx));
+ }
+ parameters->target().gc_mark_symbol(this, sym);
+}
+
+// When doing garbage collection, keep symbols that have been seen in
+// dynamic objects.
+inline void
+Symbol_table::gc_mark_dyn_syms(Symbol* sym)
+{
+ if (sym->in_dyn() && sym->source() == Symbol::FROM_OBJECT
+ && !sym->object()->is_dynamic())
+ this->gc_mark_symbol(sym);
+}
+
// Make TO a symbol which forwards to FROM.
void
bool is_ordinary;
unsigned int shndx = from->shndx(&is_ordinary);
this->resolve(to, esym.sym(), shndx, is_ordinary, shndx, from->object(),
- from->version());
+ from->version(), true);
if (from->in_reg())
to->set_in_reg();
if (from->in_dyn())
to->set_in_dyn();
+ if (parameters->options().gc_sections())
+ this->gc_mark_dyn_syms(to);
}
-// Record that a symbol is forced to be local by a version script.
+// Record that a symbol is forced to be local by a version script or
+// by visibility.
void
Symbol_table::force_local(Symbol* sym)
// option was used.
const char*
-Symbol_table::wrap_symbol(Object* object, const char* name,
- Stringpool::Key* name_key)
+Symbol_table::wrap_symbol(const char* name, Stringpool::Key* name_key)
{
// For some targets, we need to ignore a specific character when
// wrapping, and add it back later.
char prefix = '\0';
- if (name[0] == object->target()->wrap_char())
+ if (name[0] == parameters->target().wrap_char())
{
prefix = name[0];
++name;
return name;
}
+// This is called when we see a symbol NAME/VERSION, and the symbol
+// already exists in the symbol table, and VERSION is marked as being
+// the default version. SYM is the NAME/VERSION symbol we just added.
+// DEFAULT_IS_NEW is true if this is the first time we have seen the
+// symbol NAME/NULL. PDEF points to the entry for NAME/NULL.
+
+template<int size, bool big_endian>
+void
+Symbol_table::define_default_version(Sized_symbol<size>* sym,
+ bool default_is_new,
+ Symbol_table_type::iterator pdef)
+{
+ if (default_is_new)
+ {
+ // This is the first time we have seen NAME/NULL. Make
+ // NAME/NULL point to NAME/VERSION, and mark SYM as the default
+ // version.
+ pdef->second = sym;
+ sym->set_is_default();
+ }
+ else if (pdef->second == sym)
+ {
+ // NAME/NULL already points to NAME/VERSION. Don't mark the
+ // symbol as the default if it is not already the default.
+ }
+ else
+ {
+ // This is the unfortunate case where we already have entries
+ // for both NAME/VERSION and NAME/NULL. We now see a symbol
+ // NAME/VERSION where VERSION is the default version. We have
+ // already resolved this new symbol with the existing
+ // NAME/VERSION symbol.
+
+ // It's possible that NAME/NULL and NAME/VERSION are both
+ // defined in regular objects. This can only happen if one
+ // object file defines foo and another defines foo@@ver. This
+ // is somewhat obscure, but we call it a multiple definition
+ // error.
+
+ // It's possible that NAME/NULL actually has a version, in which
+ // case it won't be the same as VERSION. This happens with
+ // ver_test_7.so in the testsuite for the symbol t2_2. We see
+ // t2_2@@VER2, so we define both t2_2/VER2 and t2_2/NULL. We
+ // then see an unadorned t2_2 in an object file and give it
+ // version VER1 from the version script. This looks like a
+ // default definition for VER1, so it looks like we should merge
+ // t2_2/NULL with t2_2/VER1. That doesn't make sense, but it's
+ // not obvious that this is an error, either. So we just punt.
+
+ // If one of the symbols has non-default visibility, and the
+ // 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.
+
+ if (pdef->second->version() != NULL)
+ gold_assert(pdef->second->version() != sym->version());
+ else if (sym->visibility() != elfcpp::STV_DEFAULT
+ && pdef->second->is_from_dynobj())
+ ;
+ 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;
+ symdef = this->get_sized_symbol<size>(pdef->second);
+ Symbol_table::resolve<size, big_endian>(sym, symdef);
+ this->make_forwarder(pdef->second, sym);
+ pdef->second = sym;
+ sym->set_is_default();
+ }
+ }
+}
+
// Add one symbol from OBJECT to the symbol table. NAME is symbol
// name and VERSION is the version; both are canonicalized. DEF is
// whether this is the default version. ST_SHNDX is the symbol's
// 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
template<int size, bool big_endian>
Sized_symbol<size>*
Symbol_table::add_from_object(Object* object,
- const char *name,
+ const char* name,
Stringpool::Key name_key,
- const char *version,
+ 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,
if (orig_st_shndx == elfcpp::SHN_UNDEF
&& parameters->options().any_wrap())
{
- const char* wrap_name = this->wrap_symbol(object, name, &name_key);
+ const char* wrap_name = this->wrap_symbol(name, &name_key);
if (wrap_name != name)
{
// If we see a reference to malloc with version GLIBC_2.0,
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.
gold_assert(ret != NULL);
was_undefined = ret->is_undefined();
- was_common = ret->is_common();
+ // Commons from plugins are just placeholders.
+ was_common = ret->is_common() && ret->object()->pluginobj() == NULL;
this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object,
- version);
+ version, is_default_version);
+ if (parameters->options().gc_sections())
+ this->gc_mark_dyn_syms(ret);
- if (def)
+ if (is_default_version)
+ this->define_default_version<size, big_endian>(ret, insdefault.second,
+ insdefault.first);
+ else
{
- if (insdef.second)
+ bool dummy;
+ if (version != NULL
+ && ret->source() == Symbol::FROM_OBJECT
+ && ret->object() == object
+ && is_ordinary
+ && ret->shndx(&dummy) == st_shndx
+ && ret->is_default())
{
- // This is the first time we have seen NAME/NULL. Make
- // NAME/NULL point to NAME/VERSION.
- insdef.first->second = ret;
+ // We have seen NAME/VERSION already, and marked it as the
+ // default version, but now we see a definition for
+ // NAME/VERSION that is not the default version. This can
+ // happen when the assembler generates two symbols for
+ // a symbol as a result of a ".symver foo,foo@VER"
+ // directive. We see the first unversioned symbol and
+ // we may mark it as the default version (from a
+ // version script); then we see the second versioned
+ // symbol and we need to override the first.
+ // In any other case, the two symbols should have generated
+ // a multiple definition error.
+ // (See PR gold/18703.)
+ ret->set_is_not_default();
+ const Stringpool::Key vnull_key = 0;
+ this->table_.erase(std::make_pair(name_key, vnull_key));
}
- else if (insdef.first->second != ret)
- {
- // This is the unfortunate case where we already have
- // entries for both NAME/VERSION and NAME/NULL. We now
- // see a symbol NAME/VERSION where VERSION is the
- // default version. We have already resolved this new
- // symbol with the existing NAME/VERSION symbol.
-
- // It's possible that NAME/NULL and NAME/VERSION are
- // both defined in regular objects. This can only
- // happen if one object file defines foo and another
- // defines foo@@ver. This is somewhat obscure, but we
- // call it a multiple definition error.
-
- // It's possible that NAME/NULL actually has a version,
- // in which case it won't be the same as VERSION. This
- // happens with ver_test_7.so in the testsuite for the
- // symbol t2_2. We see t2_2@@VER2, so we define both
- // t2_2/VER2 and t2_2/NULL. We then see an unadorned
- // t2_2 in an object file and give it version VER1 from
- // the version script. This looks like a default
- // definition for VER1, so it looks like we should merge
- // t2_2/NULL with t2_2/VER1. That doesn't make sense,
- // but it's not obvious that this is an error, either.
- // So we just punt.
-
- // If one of the symbols has non-default visibility, and
- // the other is defined in a shared object, then they
- // are different symbols.
-
- // Otherwise, we just resolve the symbols as though they
- // were the same.
-
- if (insdef.first->second->version() != NULL)
- {
- gold_assert(insdef.first->second->version() != version);
- def = false;
- }
- else if (ret->visibility() != elfcpp::STV_DEFAULT
- && insdef.first->second->is_from_dynobj())
- def = false;
- else if (insdef.first->second->visibility() != elfcpp::STV_DEFAULT
- && ret->is_from_dynobj())
- def = false;
- else
- {
- const Sized_symbol<size>* sym2;
- sym2 = this->get_sized_symbol<size>(insdef.first->second);
- Symbol_table::resolve<size, big_endian>(ret, sym2);
- this->make_forwarder(insdef.first->second, ret);
- insdef.first->second = ret;
- }
- }
- else
- def = false;
}
}
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();
+ // Commons from plugins are just placeholders.
+ was_common = ret->is_common() && ret->object()->pluginobj() == NULL;
this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object,
- version);
+ version, is_default_version);
+ if (parameters->options().gc_sections())
+ this->gc_mark_dyn_syms(ret);
ins.first->second = ret;
}
else
was_common = false;
Sized_target<size, big_endian>* target =
- object->sized_target<size, big_endian>();
+ parameters->sized_target<size, big_endian>();
if (!target->has_make_symbol())
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
// 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 (is_default_version)
+ ret->set_is_default();
}
// Record every time we see a new undefined symbol, to speed up
// archive groups.
if (!was_undefined && ret->is_undefined())
- ++this->saw_undefined_;
+ {
+ ++this->saw_undefined_;
+ if (parameters->options().has_plugins())
+ parameters->options().plugins()->new_undefined_symbol(ret);
+ }
// Keep track of common symbols, to speed up common symbol
- // allocation.
- if (!was_common && ret->is_common())
+ // allocation. Don't record commons from plugin objects;
+ // we need to wait until we see the real symbol in the
+ // replacement file.
+ if (!was_common && ret->is_common() && ret->object()->pluginobj() == NULL)
{
- if (ret->type() != elfcpp::STT_TLS)
- this->commons_.push_back(ret);
- else
+ if (ret->type() == elfcpp::STT_TLS)
this->tls_commons_.push_back(ret);
+ else if (!is_ordinary
+ && st_shndx == parameters->target().small_common_shndx())
+ this->small_commons_.push_back(ret);
+ else if (!is_ordinary
+ && st_shndx == parameters->target().large_common_shndx())
+ this->large_commons_.push_back(ret);
+ else
+ this->commons_.push_back(ret);
}
- if (def)
- ret->set_is_default();
+ // If we're not doing a relocatable link, then any symbol with
+ // hidden or internal visibility is local.
+ 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);
+
return ret;
}
template<int size, bool big_endian>
void
Symbol_table::add_from_relobj(
- Sized_relobj<size, big_endian>* relobj,
+ Sized_relobj_file<size, big_endian>* relobj,
const unsigned char* syms,
size_t count,
size_t symndx_offset,
const char* sym_names,
size_t sym_name_size,
- typename Sized_relobj<size, big_endian>::Symbols* sympointers,
- size_t *defined)
+ typename Sized_relobj_file<size, big_endian>::Symbols* sympointers,
+ size_t* defined)
{
*defined = 0;
- gold_assert(size == relobj->target()->get_size());
gold_assert(size == parameters->target().get_size());
const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
const char* name = sym_names + st_name;
+ if (!parameters->options().relocatable()
+ && strcmp (name, "__gnu_lto_slim") == 0)
+ gold_info(_("%s: plugin needed to handle lto object"),
+ relobj->name().c_str());
+
bool is_ordinary;
unsigned int st_shndx = relobj->adjust_sym_shndx(i + symndx_offset,
sym.get_st_shndx(),
// 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;
+
+ // FIXME: For incremental links, we don't store version information,
+ // so we need to ignore version symbols for now.
+ if (parameters->incremental_update() && ver != NULL)
+ {
+ namelen = ver - name;
+ ver = NULL;
+ }
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;
}
}
{
memcpy(symbuf, p, sym_size);
elfcpp::Sym_write<size, big_endian> sw(symbuf);
- if (orig_st_shndx != elfcpp::SHN_UNDEF && is_ordinary)
+ if (orig_st_shndx != elfcpp::SHN_UNDEF
+ && is_ordinary
+ && relobj->e_type() == elfcpp::ET_REL)
{
- // Symbol values in object files are section relative.
- // This is normally what we want, but since here we are
- // converting the symbol to absolute we need to add the
- // section address. The section address in an object
+ // Symbol values in relocatable object files are section
+ // relative. This is normally what we want, but since here
+ // we are converting the symbol to absolute we need to add
+ // the section address. The section address in an object
// file is normally zero, but people can use a linker
// script to change it.
sw.put_st_value(sym.get_st_value()
psym = &sym2;
}
+ // Fix up visibility if object has no-export set.
+ if (relobj->no_export()
+ && (orig_st_shndx != elfcpp::SHN_UNDEF || !is_ordinary))
+ {
+ // We may have copied symbol already above.
+ if (psym != &sym2)
+ {
+ memcpy(symbuf, p, sym_size);
+ psym = &sym2;
+ }
+
+ elfcpp::STV visibility = sym2.get_st_visibility();
+ if (visibility == elfcpp::STV_DEFAULT
+ || visibility == elfcpp::STV_PROTECTED)
+ {
+ elfcpp::Sym_write<size, big_endian> sw(symbuf);
+ unsigned char nonvis = sym2.get_st_nonvis();
+ sw.put_st_other(elfcpp::STV_HIDDEN, nonvis);
+ }
+ }
+
Stringpool::Key name_key;
name = this->namepool_.add_with_length(name, namelen, true,
&name_key);
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 (local)
+ if (res == NULL)
+ continue;
+
+ if (is_forced_local)
this->force_local(res);
+ // Do not treat this symbol as garbage if this symbol will be
+ // exported to the dynamic symbol table. This is true when
+ // building a shared library or using --export-dynamic and
+ // the symbol is externally visible.
+ if (parameters->options().gc_sections()
+ && res->is_externally_visible()
+ && !res->is_from_dynobj()
+ && (parameters->options().shared()
+ || parameters->options().export_dynamic()
+ || parameters->options().in_dynamic_list(res->name())))
+ this->gc_mark_symbol(res);
+
+ if (is_defined_in_discarded_section)
+ res->set_is_defined_in_discarded_section();
+
(*sympointers)[i] = res;
}
}
elfcpp::Sym<size, big_endian>* sym)
{
unsigned int st_shndx = sym->get_st_shndx();
+ 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, true, st_shndx);
+ is_default_version, *sym, st_shndx,
+ is_ordinary, st_shndx);
- if (local)
- this->force_local(res);
+ if (res == NULL)
+ return NULL;
+
+ if (is_forced_local)
+ this->force_local(res);
return res;
}
const unsigned char* versym,
size_t versym_size,
const std::vector<const char*>* version_map,
- typename Sized_relobj<size, big_endian>::Symbols* sympointers,
+ typename Sized_relobj_file<size, big_endian>::Symbols* sympointers,
size_t* defined)
{
*defined = 0;
- gold_assert(size == dynobj->target()->get_size());
gold_assert(size == parameters->target().get_size());
if (dynobj->just_symbols())
return;
}
+ // FIXME: For incremental links, we don't store version information,
+ // so we need to ignore version symbols for now.
+ if (parameters->incremental_update())
+ versym = NULL;
+
if (versym != NULL && versym_size / 2 < count)
{
dynobj->error(_("too few symbol versions"));
// 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;
}
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);
}
}
}
+ 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;
}
this->record_weak_aliases(&object_symbols);
}
+// Add a symbol from a incremental object file.
+
+template<int size, bool big_endian>
+Sized_symbol<size>*
+Symbol_table::add_from_incrobj(
+ Object* obj,
+ const char* name,
+ const char* ver,
+ elfcpp::Sym<size, big_endian>* sym)
+{
+ unsigned int st_shndx = sym->get_st_shndx();
+ bool is_ordinary = st_shndx < elfcpp::SHN_LORESERVE;
+
+ Stringpool::Key ver_key = 0;
+ bool is_default_version = false;
+
+ Stringpool::Key name_key;
+ name = this->namepool_.add(name, true, &name_key);
+
+ Sized_symbol<size>* res;
+ res = this->add_from_object(obj, name, name_key, ver, ver_key,
+ is_default_version, *sym, st_shndx,
+ is_ordinary, st_shndx);
+
+ return res;
+}
+
// This is used to sort weak aliases. We sort them first by section
// index, then by offset, then by weak ahead of strong.
// 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.
+// symbol if there is one. This sets *RESOLVE_OLDSYM if we should
+// resolve the newly created symbol to the old one. This
+// canonicalizes *PNAME and *PVERSION.
template<int size, bool big_endian>
Sized_symbol<size>*
Symbol_table::define_special_symbol(const char** pname, const char** pversion,
bool only_if_ref,
- Sized_symbol<size>** poldsym)
+ Sized_symbol<size>** poldsym,
+ bool* resolve_oldsym, bool is_forced_local)
{
- Symbol* oldsym;
- Sized_symbol<size>* sym;
- bool add_to_table = false;
- typename Symbol_table_type::iterator add_loc = this->table_.end();
+ *resolve_oldsym = false;
+ *poldsym = NULL;
// If the caller didn't give us a version, see if we get one from
// the version script.
std::string v;
- if (*pversion == NULL)
+ bool is_default_version = false;
+ if (!is_forced_local && *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 (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;
+ }
}
}
+ Symbol* oldsym;
+ Sized_symbol<size>* sym;
+
+ bool add_to_table = false;
+ typename Symbol_table_type::iterator add_loc = this->table_.end();
+ bool add_def_to_table = false;
+ typename Symbol_table_type::iterator add_def_loc = this->table_.end();
+
if (only_if_ref)
{
oldsym = this->lookup(*pname, *pversion);
+ if (oldsym == NULL && is_default_version)
+ oldsym = this->lookup(*pname, NULL);
if (oldsym == NULL || !oldsym->is_undefined())
return NULL;
*pname = oldsym->name();
- *pversion = oldsym->version();
+ if (is_default_version)
+ *pversion = this->namepool_.add(*pversion, true, NULL);
+ else
+ *pversion = oldsym->version();
}
else
{
version_key),
snull));
+ 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;
+ insdefault =
+ this->table_.insert(std::make_pair(std::make_pair(name_key,
+ vnull),
+ snull));
+ }
+
if (!ins.second)
{
// We already have a symbol table entry for NAME/VERSION.
oldsym = ins.first->second;
gold_assert(oldsym != NULL);
+
+ if (is_default_version)
+ {
+ Sized_symbol<size>* soldsym =
+ this->get_sized_symbol<size>(oldsym);
+ this->define_default_version<size, big_endian>(soldsym,
+ insdefault.second,
+ insdefault.first);
+ }
}
else
{
// We haven't seen this symbol before.
gold_assert(ins.first->second == NULL);
- add_to_table = true;
- add_loc = ins.first;
- oldsym = NULL;
+
+ add_to_table = true;
+ add_loc = ins.first;
+
+ 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 = insdefault.first->second;
+ *resolve_oldsym = true;
+ }
+ else
+ {
+ oldsym = NULL;
+
+ if (is_default_version)
+ {
+ add_def_to_table = true;
+ add_def_loc = insdefault.first;
+ }
+ }
}
}
sym = new Sized_symbol<size>();
else
{
- gold_assert(target.get_size() == size);
- gold_assert(target.is_big_endian() ? big_endian : !big_endian);
- typedef Sized_target<size, big_endian> My_target;
- const My_target* sized_target =
- static_cast<const My_target*>(&target);
- sym = sized_target->make_symbol();
+ Sized_target<size, big_endian>* sized_target =
+ parameters->sized_target<size, big_endian>();
+ sym = sized_target->make_symbol(*pname, elfcpp::STT_NOTYPE,
+ NULL, elfcpp::SHN_UNDEF, 0);
if (sym == NULL)
return NULL;
}
else
gold_assert(oldsym != NULL);
+ if (add_def_to_table)
+ add_def_loc->second = sym;
+
*poldsym = this->get_sized_symbol<size>(oldsym);
return sym;
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,
{
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);
+ only_if_ref, &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);
+ only_if_ref, &oldsym,
+ &resolve_oldsym,
+ is_forced_local);
#else
gold_unreachable();
#endif
return NULL;
sym->init_output_data(name, version, od, value, symsize, type, binding,
- visibility, nonvis, offset_is_from_end);
+ visibility, nonvis, offset_is_from_end,
+ defined == PREDEFINED);
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;
}
- if (Symbol_table::should_override_with_special(oldsym))
+ if (Symbol_table::should_override_with_special(oldsym, type, defined))
this->override_with_special(oldsym, sym);
- delete sym;
- return oldsym;
+
+ if (resolve_oldsym)
+ return sym;
+ else
+ {
+ if (defined == PREDEFINED
+ && (is_forced_local || this->version_script_.symbol_is_local(name)))
+ this->force_local(oldsym);
+ delete sym;
+ return oldsym;
+ }
}
// Define a symbol based on an Output_segment.
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,
{
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);
+ only_if_ref, &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);
+ only_if_ref, &oldsym,
+ &resolve_oldsym,
+ is_forced_local);
#else
gold_unreachable();
#endif
return NULL;
sym->init_output_segment(name, version, os, value, symsize, type, binding,
- visibility, nonvis, offset_base);
+ visibility, nonvis, offset_base,
+ defined == PREDEFINED);
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;
}
- if (Symbol_table::should_override_with_special(oldsym))
+ if (Symbol_table::should_override_with_special(oldsym, type, defined))
this->override_with_special(oldsym, sym);
- delete sym;
- return oldsym;
+
+ if (resolve_oldsym)
+ return sym;
+ else
+ {
+ if (is_forced_local || this->version_script_.symbol_is_local(name))
+ this->force_local(oldsym);
+ delete sym;
+ return oldsym;
+ }
}
// Define a special symbol with a constant value. It is a multiple
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,
{
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);
+ only_if_ref, &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);
+ only_if_ref, &oldsym,
+ &resolve_oldsym,
+ is_forced_local);
#else
gold_unreachable();
#endif
return NULL;
sym->init_constant(name, version, value, symsize, type, binding, visibility,
- nonvis);
+ nonvis, defined == PREDEFINED);
if (oldsym == NULL)
{
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;
}
- if (force_override || Symbol_table::should_override_with_special(oldsym))
+ if (force_override
+ || Symbol_table::should_override_with_special(oldsym, type, defined))
this->override_with_special(oldsym, sym);
- delete sym;
- return oldsym;
+
+ if (resolve_oldsym)
+ return sym;
+ else
+ {
+ if (is_forced_local || this->version_script_.symbol_is_local(name))
+ this->force_local(oldsym);
+ delete sym;
+ return oldsym;
+ }
}
// Define a set of symbols in output sections.
{
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(),
// Add any undefined symbols named on the command line.
void
-Symbol_table::add_undefined_symbols_from_command_line()
+Symbol_table::add_undefined_symbols_from_command_line(Layout* layout)
{
- if (parameters->options().any_undefined())
+ if (parameters->options().any_undefined()
+ || layout->script_options()->any_unreferenced())
{
if (parameters->target().get_size() == 32)
{
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
- this->do_add_undefined_symbols_from_command_line<32>();
+ this->do_add_undefined_symbols_from_command_line<32>(layout);
#else
gold_unreachable();
#endif
else if (parameters->target().get_size() == 64)
{
#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
- this->do_add_undefined_symbols_from_command_line<64>();
+ this->do_add_undefined_symbols_from_command_line<64>(layout);
#else
gold_unreachable();
#endif
template<int size>
void
-Symbol_table::do_add_undefined_symbols_from_command_line()
+Symbol_table::do_add_undefined_symbols_from_command_line(Layout* layout)
{
for (options::String_set::const_iterator p =
parameters->options().undefined_begin();
p != parameters->options().undefined_end();
++p)
- {
- const char* name = p->c_str();
+ this->add_undefined_symbol_from_command_line<size>(p->c_str());
- if (this->lookup(name) != NULL)
- continue;
+ for (options::String_set::const_iterator p =
+ parameters->options().export_dynamic_symbol_begin();
+ p != parameters->options().export_dynamic_symbol_end();
+ ++p)
+ this->add_undefined_symbol_from_command_line<size>(p->c_str());
- const char* version = NULL;
+ for (Script_options::referenced_const_iterator p =
+ layout->script_options()->referenced_begin();
+ p != layout->script_options()->referenced_end();
+ ++p)
+ this->add_undefined_symbol_from_command_line<size>(p->c_str());
+}
- Sized_symbol<size>* sym;
- Sized_symbol<size>* oldsym;
- if (parameters->target().is_big_endian())
- {
+template<int size>
+void
+Symbol_table::add_undefined_symbol_from_command_line(const char* name)
+{
+ if (this->lookup(name) != NULL)
+ return;
+
+ const char* version = NULL;
+
+ Sized_symbol<size>* sym;
+ Sized_symbol<size>* oldsym;
+ bool resolve_oldsym;
+ 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,
- false, &oldsym);
+ sym = this->define_special_symbol<size, true>(&name, &version,
+ false, &oldsym,
+ &resolve_oldsym,
+ false);
#else
- gold_unreachable();
+ gold_unreachable();
#endif
- }
- else
- {
+ }
+ else
+ {
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
- sym = this->define_special_symbol<size, false>(&name, &version,
- false, &oldsym);
+ sym = this->define_special_symbol<size, false>(&name, &version,
+ false, &oldsym,
+ &resolve_oldsym,
+ false);
#else
- gold_unreachable();
+ gold_unreachable();
#endif
- }
+ }
- gold_assert(oldsym == NULL);
+ gold_assert(oldsym == NULL);
- sym->init_undefined(name, version, elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
- elfcpp::STV_DEFAULT, 0);
- ++this->saw_undefined_;
- }
+ 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())
+ {
+ std::vector<Symbol*> dyn_symbols;
+ for (Symbol_table_type::iterator p = this->table_.begin();
+ p != this->table_.end();
+ ++p)
+ {
+ Symbol* sym = p->second;
+ if (sym->is_forced_local())
+ continue;
+ if (!sym->should_add_dynsym_entry(this))
+ sym->set_dynsym_index(-1U);
+ else
+ dyn_symbols.push_back(sym);
+ }
+
+ return parameters->target().set_dynsym_indexes(&dyn_symbols, index, syms,
+ dynpool, versions, this);
+ }
+
for (Symbol_table_type::iterator p = this->table_.begin();
p != this->table_.end();
++p)
{
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.
- if (!sym->should_add_dynsym_entry())
+ if (!sym->should_add_dynsym_entry(this))
sym->set_dynsym_index(-1U);
else if (!sym->has_dynsym_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);
+ // If the symbol is defined in a dynamic object and is
+ // referenced strongly in a regular object, then mark the
+ // dynamic object as needed. This is used to implement
+ // --as-needed.
+ if (sym->is_from_dynobj()
+ && sym->in_reg()
+ && !sym->is_undef_binding_weak())
+ sym->object()->set_is_needed();
+
+ // Record any version information, except those from
+ // as-needed libraries not seen to be needed. Note that the
+ // is_needed state for such libraries can change in this loop.
+ if (sym->version() != NULL)
+ {
+ if (!sym->is_from_dynobj()
+ || !sym->object()->as_needed()
+ || sym->object()->is_needed())
+ versions->record_version(this, dynpool, sym);
+ else
+ as_needed_sym.push_back(sym);
+ }
}
}
+ // Process version information for symbols from as-needed libraries.
+ for (std::vector<Symbol*>::iterator p = as_needed_sym.begin();
+ p != as_needed_sym.end();
+ ++p)
+ {
+ Symbol* sym = *p;
+
+ if (sym->object()->is_needed())
+ versions->record_version(this, dynpool, sym);
+ else
+ sym->clear_version();
+ }
+
// Finish up the versions. In some cases this may add new dynamic
// 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,
size_t dyncount, Stringpool* pool,
- unsigned int *plocal_symcount)
+ unsigned int* plocal_symcount)
{
off_t ret;
unsigned int* pindex, off_t* poff)
{
sym->set_symtab_index(*pindex);
- pool->add(sym->name(), false, NULL);
+ if (sym->version() == NULL || !parameters->options().relocatable())
+ pool->add(sym->name(), false, NULL);
+ else
+ pool->add(sym->versioned_name(), true, NULL);
++*pindex;
*poff += elfcpp::Elf_sizes<size>::sym_size;
}
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;
}
-// Finalize the symbol SYM. This returns true if the symbol should be
-// added to the symbol table, false otherwise.
+// Compute the final value of SYM and store status in location PSTATUS.
+// During relaxation, this may be called multiple times for a symbol to
+// compute its would-be final value in each relaxation pass.
template<int size>
-bool
-Symbol_table::sized_finalize_symbol(Symbol* unsized_sym)
+typename Sized_symbol<size>::Value_type
+Symbol_table::compute_final_value(
+ const Sized_symbol<size>* sym,
+ Compute_final_value_status* pstatus) const
{
typedef typename Sized_symbol<size>::Value_type Value_type;
-
- Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym);
-
- // 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())
- return false;
-
- if (!sym->in_reg())
- {
- gold_assert(!sym->has_symtab_index());
- sym->set_symtab_index(-1U);
- gold_assert(sym->dynsym_index() == -1U);
- return false;
- }
-
Value_type value;
switch (sym->source())
bool is_ordinary;
unsigned int shndx = sym->shndx(&is_ordinary);
- // FIXME: We need some target specific support here.
if (!is_ordinary
&& shndx != elfcpp::SHN_ABS
- && shndx != elfcpp::SHN_COMMON)
+ && !Symbol::is_common_shndx(shndx))
{
- gold_error(_("%s: unsupported symbol section 0x%x"),
- sym->demangled_name().c_str(), shndx);
- shndx = elfcpp::SHN_UNDEF;
+ *pstatus = CFVS_UNSUPPORTED_SYMBOL_SECTION;
+ return 0;
}
Object* symobj = sym->object();
else if (shndx == elfcpp::SHN_UNDEF)
value = 0;
else if (!is_ordinary
- && (shndx == elfcpp::SHN_ABS || shndx == elfcpp::SHN_COMMON))
+ && (shndx == elfcpp::SHN_ABS
+ || Symbol::is_common_shndx(shndx)))
value = sym->value();
else
{
Relobj* relobj = static_cast<Relobj*>(symobj);
Output_section* os = relobj->output_section(shndx);
- if (os == NULL)
+ if (this->is_section_folded(relobj, shndx))
+ {
+ gold_assert(os == NULL);
+ // Get the os of the section it is folded onto.
+ Section_id folded = this->icf_->get_folded_section(relobj,
+ shndx);
+ gold_assert(folded.first != NULL);
+ Relobj* folded_obj = reinterpret_cast<Relobj*>(folded.first);
+ unsigned folded_shndx = folded.second;
+
+ os = folded_obj->output_section(folded_shndx);
+ gold_assert(os != NULL);
+
+ // 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)
{
- sym->set_symtab_index(-1U);
- gold_assert(sym->dynsym_index() == -1U);
- return false;
+ bool static_or_reloc = (parameters->doing_static_link() ||
+ parameters->options().relocatable());
+ gold_assert(static_or_reloc || sym->dynsym_index() == -1U);
+
+ *pstatus = CFVS_NO_OUTPUT_SECTION;
+ return 0;
}
- uint64_t secoff64 = relobj->output_section_offset(shndx);
- Value_type secoff = convert_types<Value_type, uint64_t>(secoff64);
- if (sym->type() == elfcpp::STT_TLS)
- value = sym->value() + os->tls_offset() + secoff;
- else
- value = sym->value() + os->address() + secoff;
+ if (secoff64 == -1ULL)
+ {
+ // The section needs special handling (e.g., a merge section).
+
+ value = os->output_address(relobj, shndx, sym->value());
+ }
+ else
+ {
+ Value_type secoff =
+ convert_types<Value_type, uint64_t>(secoff64);
+ if (sym->type() == elfcpp::STT_TLS)
+ value = sym->value() + os->tls_offset() + secoff;
+ else
+ value = sym->value() + os->address() + secoff;
+ }
}
}
break;
gold_unreachable();
}
+ *pstatus = CFVS_OK;
+ return value;
+}
+
+// Finalize the symbol SYM. This returns true if the symbol should be
+// added to the symbol table, false otherwise.
+
+template<int size>
+bool
+Symbol_table::sized_finalize_symbol(Symbol* unsized_sym)
+{
+ typedef typename Sized_symbol<size>::Value_type Value_type;
+
+ Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym);
+
+ // 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())
+ return false;
+
+ if (!sym->in_reg())
+ {
+ gold_assert(!sym->has_symtab_index());
+ sym->set_symtab_index(-1U);
+ gold_assert(sym->dynsym_index() == -1U);
+ return false;
+ }
+
+ // If the symbol is only present on plugin files, the plugin decided we
+ // don't need it.
+ if (!sym->in_real_elf())
+ {
+ gold_assert(!sym->has_symtab_index());
+ sym->set_symtab_index(-1U);
+ return false;
+ }
+
+ // Compute final symbol value.
+ Compute_final_value_status status;
+ Value_type value = this->compute_final_value(sym, &status);
+
+ switch (status)
+ {
+ case CFVS_OK:
+ break;
+ case CFVS_UNSUPPORTED_SYMBOL_SECTION:
+ {
+ bool is_ordinary;
+ unsigned int shndx = sym->shndx(&is_ordinary);
+ gold_error(_("%s: unsupported symbol section 0x%x"),
+ sym->demangled_name().c_str(), shndx);
+ }
+ break;
+ case CFVS_NO_OUTPUT_SECTION:
+ sym->set_symtab_index(-1U);
+ return false;
+ default:
+ gold_unreachable();
+ }
+
sym->set_value(value);
- if (parameters->options().strip_all())
+ if (parameters->options().strip_all()
+ || !parameters->options().should_retain_symbol(sym->name()))
{
sym->set_symtab_index(-1U);
return false;
// Write out the global symbols.
void
-Symbol_table::write_globals(const Input_objects* input_objects,
- const Stringpool* sympool,
+Symbol_table::write_globals(const Stringpool* sympool,
const Stringpool* dynpool,
Output_symtab_xindex* symtab_xindex,
Output_symtab_xindex* dynsym_xindex,
{
#ifdef HAVE_TARGET_32_LITTLE
case Parameters::TARGET_32_LITTLE:
- this->sized_write_globals<32, false>(input_objects, sympool,
- dynpool, symtab_xindex,
+ this->sized_write_globals<32, false>(sympool, dynpool, symtab_xindex,
dynsym_xindex, of);
break;
#endif
#ifdef HAVE_TARGET_32_BIG
case Parameters::TARGET_32_BIG:
- this->sized_write_globals<32, true>(input_objects, sympool,
- dynpool, symtab_xindex,
+ this->sized_write_globals<32, true>(sympool, dynpool, symtab_xindex,
dynsym_xindex, of);
break;
#endif
#ifdef HAVE_TARGET_64_LITTLE
case Parameters::TARGET_64_LITTLE:
- this->sized_write_globals<64, false>(input_objects, sympool,
- dynpool, symtab_xindex,
+ this->sized_write_globals<64, false>(sympool, dynpool, symtab_xindex,
dynsym_xindex, of);
break;
#endif
#ifdef HAVE_TARGET_64_BIG
case Parameters::TARGET_64_BIG:
- this->sized_write_globals<64, true>(input_objects, sympool,
- dynpool, symtab_xindex,
+ this->sized_write_globals<64, true>(sympool, dynpool, symtab_xindex,
dynsym_xindex, of);
break;
#endif
template<int size, bool big_endian>
void
-Symbol_table::sized_write_globals(const Input_objects* input_objects,
- const Stringpool* sympool,
+Symbol_table::sized_write_globals(const Stringpool* sympool,
const Stringpool* dynpool,
Output_symtab_xindex* symtab_xindex,
Output_symtab_xindex* dynsym_xindex,
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);
+ this->warn_about_undefined_dynobj_symbol(sym);
unsigned int sym_index = sym->symtab_index();
unsigned int dynsym_index;
unsigned int shndx;
typename elfcpp::Elf_types<size>::Elf_Addr sym_value = sym->value();
typename elfcpp::Elf_types<size>::Elf_Addr dynsym_value = sym_value;
+ elfcpp::STB binding = sym->binding();
+
+ // If --weak-unresolved-symbols is set, change binding of unresolved
+ // global symbols to STB_WEAK.
+ if (parameters->options().weak_unresolved_symbols()
+ && binding == elfcpp::STB_GLOBAL
+ && sym->is_undefined())
+ binding = elfcpp::STB_WEAK;
+
+ // If --no-gnu-unique is set, change STB_GNU_UNIQUE to STB_GLOBAL.
+ if (binding == elfcpp::STB_GNU_UNIQUE
+ && !parameters->options().gnu_unique())
+ binding = elfcpp::STB_GLOBAL;
+
switch (sym->source())
{
case Symbol::FROM_OBJECT:
bool is_ordinary;
unsigned int in_shndx = sym->shndx(&is_ordinary);
- // FIXME: We need some target specific support here.
if (!is_ordinary
&& in_shndx != elfcpp::SHN_ABS
- && in_shndx != elfcpp::SHN_COMMON)
+ && !Symbol::is_common_shndx(in_shndx))
{
gold_error(_("%s: unsupported symbol section 0x%x"),
sym->demangled_name().c_str(), in_shndx);
if (sym->needs_dynsym_value())
dynsym_value = target.dynsym_value(sym);
shndx = elfcpp::SHN_UNDEF;
+ if (sym->is_undef_binding_weak())
+ binding = elfcpp::STB_WEAK;
+ else
+ binding = elfcpp::STB_GLOBAL;
}
else if (symobj->pluginobj() != NULL)
shndx = elfcpp::SHN_UNDEF;
else if (in_shndx == elfcpp::SHN_UNDEF
|| (!is_ordinary
&& (in_shndx == elfcpp::SHN_ABS
- || in_shndx == elfcpp::SHN_COMMON)))
+ || Symbol::is_common_shndx(in_shndx))))
shndx = in_shndx;
else
{
Relobj* relobj = static_cast<Relobj*>(symobj);
Output_section* os = relobj->output_section(in_shndx);
+ if (this->is_section_folded(relobj, in_shndx))
+ {
+ // This global symbol must be written out even though
+ // it is folded.
+ // Get the os of the section it is folded onto.
+ Section_id folded =
+ this->icf_->get_folded_section(relobj, in_shndx);
+ gold_assert(folded.first !=NULL);
+ Relobj* folded_obj =
+ reinterpret_cast<Relobj*>(folded.first);
+ os = folded_obj->output_section(folded.second);
+ gold_assert(os != NULL);
+ }
gold_assert(os != NULL);
shndx = os->out_shndx();
break;
case Symbol::IN_OUTPUT_DATA:
- shndx = sym->output_data()->out_shndx();
- if (shndx >= elfcpp::SHN_LORESERVE)
- {
- if (sym_index != -1U)
- symtab_xindex->add(sym_index, shndx);
- if (dynsym_index != -1U)
- dynsym_xindex->add(dynsym_index, shndx);
- shndx = elfcpp::SHN_XINDEX;
- }
+ {
+ Output_data* od = sym->output_data();
+
+ shndx = od->out_shndx();
+ if (shndx >= elfcpp::SHN_LORESERVE)
+ {
+ if (sym_index != -1U)
+ symtab_xindex->add(sym_index, shndx);
+ if (dynsym_index != -1U)
+ dynsym_xindex->add(dynsym_index, shndx);
+ shndx = elfcpp::SHN_XINDEX;
+ }
+
+ // In object files symbol values are section
+ // relative.
+ if (parameters->options().relocatable())
+ {
+ 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:
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,
- sympool, ps);
+ binding, sympool, ps);
}
if (dynsym_index != -1U)
gold_assert(dynsym_index < dynamic_count);
unsigned char* pd = dynamic_view + (dynsym_index * sym_size);
this->sized_write_symbol<size, big_endian>(sym, dynsym_value, shndx,
- dynpool, pd);
+ binding, dynpool, pd);
+ // Allow a target to adjust dynamic symbol value.
+ parameters->target().adjust_dyn_symbol(sym, pd);
+ }
+ }
+
+ // 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);
}
}
Sized_symbol<size>* sym,
typename elfcpp::Elf_types<size>::Elf_Addr value,
unsigned int shndx,
+ elfcpp::STB binding,
const Stringpool* pool,
unsigned char* p) const
{
elfcpp::Sym_write<size, big_endian> osym(p);
- osym.put_st_name(pool->get_offset(sym->name()));
+ if (sym->version() == NULL || !parameters->options().relocatable())
+ osym.put_st_name(pool->get_offset(sym->name()));
+ else
+ osym.put_st_name(pool->get_offset(sym->versioned_name()));
osym.put_st_value(value);
// Use a symbol size of zero for undefined symbols from shared libraries.
if (shndx == elfcpp::SHN_UNDEF && sym->is_from_dynobj())
osym.put_st_size(0);
else
osym.put_st_size(sym->symsize());
+ elfcpp::STT type = sym->type();
+ gold_assert(type != elfcpp::STT_GNU_IFUNC || !sym->is_from_dynobj());
// 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(binding, type));
osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis()));
osym.put_st_shndx(shndx);
}
// 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.
+// We also don't warn about libraries found in a system library
+// directory (e.g., /lib or /usr/lib); we assume that those libraries
+// are OK. This heuristic avoids problems on 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
+Symbol_table::warn_about_undefined_dynobj_symbol(Symbol* sym) const
{
bool dummy;
if (sym->source() == Symbol::FROM_OBJECT
&& sym->binding() != elfcpp::STB_WEAK
&& !parameters->options().allow_shlib_undefined()
&& !parameters->target().is_defined_by_abi(sym)
- && !input_objects->found_in_system_library_directory(sym->object()))
+ && !sym->object()->is_in_system_directory())
{
// A very ugly cast.
Dynobj* dynobj = static_cast<Dynobj*>(sym->object());
if (!dynobj->has_unknown_needed_entries())
- {
- if (sym->version())
- gold_error(_("%s: undefined reference to '%s', version '%s'"),
- sym->object()->name().c_str(),
- sym->demangled_name().c_str(),
- sym->version());
- else
- gold_error(_("%s: undefined reference to '%s'"),
- sym->object()->name().c_str(),
- sym->demangled_name().c_str());
- }
+ gold_undefined_symbol(sym);
}
}
// Write out a section symbol. Return the update offset.
void
-Symbol_table::write_section_symbol(const Output_section *os,
+Symbol_table::write_section_symbol(const Output_section* os,
Output_symtab_xindex* symtab_xindex,
Output_file* of,
off_t offset) const
elfcpp::Sym_write<size, big_endian> osym(pov);
osym.put_st_name(0);
- osym.put_st_value(os->address());
+ if (parameters->options().relocatable())
+ osym.put_st_value(0);
+ else
+ 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));
// 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.
+// defined in disjoint source locations. When comparing the source
+// location, we consider instances with the same base filename to be
+// the same. This is because different object files/shared libraries
+// can include the same header file using different paths, and
+// different optimization settings can make the line number appear to
+// be a couple lines off, and we don't want to report an ODR violation
+// in those cases.
// This struct is used to compare line information, as returned by
// Dwarf_line_info::one_addr2line. It implements a < comparison
-// operator used with std::set.
+// operator used with std::sort.
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;
+ // Inputs should be of the form "dirname/filename:linenum" where
+ // "dirname/" is optional. We want to compare just the filename:linenum.
+
+ // Find the last '/' in each string.
+ std::string::size_type s1begin = s1.rfind('/');
+ std::string::size_type s2begin = s2.rfind('/');
+ // If there was no '/' in a string, start at the beginning.
+ if (s1begin == std::string::npos)
+ s1begin = 0;
+ if (s2begin == std::string::npos)
+ s2begin = 0;
+ return s1.compare(s1begin, std::string::npos,
+ s2, s2begin, std::string::npos) < 0;
}
};
+// Returns all of the lines attached to LOC, not just the one the
+// instruction actually came from.
+std::vector<std::string>
+Symbol_table::linenos_from_loc(const Task* task,
+ const Symbol_location& loc)
+{
+ // We need to lock the object in order to read it. This
+ // means that we have to run in a singleton Task. If we
+ // want to run this in a general 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. Also note, one_addr2line is not
+ // currently thread-safe.
+ Task_lock_obj<Object> tl(task, loc.object);
+
+ std::vector<std::string> result;
+ Symbol_location code_loc = loc;
+ parameters->target().function_location(&code_loc);
+ // 16 is the size of the object-cache that one_addr2line should use.
+ std::string canonical_result = Dwarf_line_info::one_addr2line(
+ code_loc.object, code_loc.shndx, code_loc.offset, 16, &result);
+ if (!canonical_result.empty())
+ result.push_back(canonical_result);
+ return result;
+}
+
+// OutputIterator that records if it was ever assigned to. This
+// allows it to be used with std::set_intersection() to check for
+// intersection rather than computing the intersection.
+struct Check_intersection
+{
+ Check_intersection()
+ : value_(false)
+ {}
+
+ bool had_intersection() const
+ { return this->value_; }
+
+ Check_intersection& operator++()
+ { return *this; }
+
+ Check_intersection& operator*()
+ { return *this; }
+
+ template<typename T>
+ Check_intersection& operator=(const T&)
+ {
+ this->value_ = true;
+ return *this;
+ }
+
+ private:
+ bool value_;
+};
+
// Check candidate_odr_violations_ to find symbols with the same name
-// but apparently different definitions (different source-file/line-no).
+// but apparently different definitions (different source-file/line-no
+// for each line assigned to the first instruction).
void
Symbol_table::detect_odr_violations(const Task* task,
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;
+ const char* const symbol_name = it->first;
+
+ std::string first_object_name;
+ std::vector<std::string> first_object_linenos;
- for (Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator
- locs = it->second.begin();
- locs != it->second.end();
- ++locs)
+ Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator
+ locs = it->second.begin();
+ const Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator
+ locs_end = it->second.end();
+ for (; locs != locs_end && first_object_linenos.empty(); ++locs)
{
- // We need to lock the object in order to read it. This
- // means that we have to run in a singleton Task. If we
- // want to run this in a general 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. Also note, one_addr2line is not
- // currently thread-safe.
- Task_lock_obj<Object> tl(task, locs->object);
- // 16 is the size of the object-cache that one_addr2line should use.
- std::string lineno = Dwarf_line_info::one_addr2line(
- locs->object, locs->shndx, locs->offset, 16);
- if (!lineno.empty())
- line_nums.insert(lineno);
+ // Save the line numbers from the first definition to
+ // compare to the other definitions. Ideally, we'd compare
+ // every definition to every other, but we don't want to
+ // take O(N^2) time to do this. This shortcut may cause
+ // false negatives that appear or disappear depending on the
+ // link order, but it won't cause false positives.
+ first_object_name = locs->object->name();
+ first_object_linenos = this->linenos_from_loc(task, *locs);
}
+ if (first_object_linenos.empty())
+ continue;
+
+ // Sort by Odr_violation_compare to make std::set_intersection work.
+ std::string first_object_canonical_result = first_object_linenos.back();
+ std::sort(first_object_linenos.begin(), first_object_linenos.end(),
+ Odr_violation_compare());
- if (line_nums.size() > 1)
+ for (; locs != locs_end; ++locs)
{
- 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());
+ std::vector<std::string> linenos =
+ this->linenos_from_loc(task, *locs);
+ // linenos will be empty if we couldn't parse the debug info.
+ if (linenos.empty())
+ continue;
+ // Sort by Odr_violation_compare to make std::set_intersection work.
+ gold_assert(!linenos.empty());
+ std::string second_object_canonical_result = linenos.back();
+ std::sort(linenos.begin(), linenos.end(), Odr_violation_compare());
+
+ Check_intersection intersection_result =
+ std::set_intersection(first_object_linenos.begin(),
+ first_object_linenos.end(),
+ linenos.begin(),
+ linenos.end(),
+ Check_intersection(),
+ Odr_violation_compare());
+ if (!intersection_result.had_intersection())
+ {
+ gold_warning(_("while linking %s: symbol '%s' defined in "
+ "multiple places (possible ODR violation):"),
+ output_file_name, demangle(symbol_name).c_str());
+ // This only prints one location from each definition,
+ // which may not be the location we expect to intersect
+ // with another definition. We could print the whole
+ // set of locations, but that seems too verbose.
+ fprintf(stderr, _(" %s from %s\n"),
+ first_object_canonical_result.c_str(),
+ first_object_name.c_str());
+ fprintf(stderr, _(" %s from %s\n"),
+ second_object_canonical_result.c_str(),
+ locs->object->name().c_str());
+ // Only print one broken pair, to avoid needing to
+ // compare against a list of the disjoint definition
+ // locations we've found so far. (If we kept comparing
+ // against just the first one, we'd get a lot of
+ // redundant complaints about the second definition
+ // location.)
+ break;
+ }
}
}
// We only call one_addr2line() in this function, so we can clear its cache.
size_t relnum, off_t reloffset) const
{
gold_assert(sym->has_warning());
+
+ // We don't want to issue a warning for a relocation against the
+ // symbol in the same object file in which the symbol is defined.
+ if (sym->object() == relinfo->object)
+ return;
+
Warning_table::const_iterator p = this->warnings_.find(sym->name());
gold_assert(p != this->warnings_.end());
gold_warning_at_location(relinfo, relnum, reloffset,
template
void
Symbol_table::add_from_relobj<32, false>(
- Sized_relobj<32, false>* relobj,
+ Sized_relobj_file<32, false>* relobj,
const unsigned char* syms,
size_t count,
size_t symndx_offset,
const char* sym_names,
size_t sym_name_size,
- Sized_relobj<32, false>::Symbols* sympointers,
+ Sized_relobj_file<32, false>::Symbols* sympointers,
size_t* defined);
#endif
template
void
Symbol_table::add_from_relobj<32, true>(
- Sized_relobj<32, true>* relobj,
+ Sized_relobj_file<32, true>* relobj,
const unsigned char* syms,
size_t count,
size_t symndx_offset,
const char* sym_names,
size_t sym_name_size,
- Sized_relobj<32, true>::Symbols* sympointers,
+ Sized_relobj_file<32, true>::Symbols* sympointers,
size_t* defined);
#endif
template
void
Symbol_table::add_from_relobj<64, false>(
- Sized_relobj<64, false>* relobj,
+ Sized_relobj_file<64, false>* relobj,
const unsigned char* syms,
size_t count,
size_t symndx_offset,
const char* sym_names,
size_t sym_name_size,
- Sized_relobj<64, false>::Symbols* sympointers,
+ Sized_relobj_file<64, false>::Symbols* sympointers,
size_t* defined);
#endif
template
void
Symbol_table::add_from_relobj<64, true>(
- Sized_relobj<64, true>* relobj,
+ Sized_relobj_file<64, true>* relobj,
const unsigned char* syms,
size_t count,
size_t symndx_offset,
const char* sym_names,
size_t sym_name_size,
- Sized_relobj<64, true>::Symbols* sympointers,
+ Sized_relobj_file<64, true>::Symbols* sympointers,
size_t* defined);
#endif
const unsigned char* versym,
size_t versym_size,
const std::vector<const char*>* version_map,
- Sized_relobj<32, false>::Symbols* sympointers,
+ Sized_relobj_file<32, false>::Symbols* sympointers,
size_t* defined);
#endif
const unsigned char* versym,
size_t versym_size,
const std::vector<const char*>* version_map,
- Sized_relobj<32, true>::Symbols* sympointers,
+ Sized_relobj_file<32, true>::Symbols* sympointers,
size_t* defined);
#endif
const unsigned char* versym,
size_t versym_size,
const std::vector<const char*>* version_map,
- Sized_relobj<64, false>::Symbols* sympointers,
+ Sized_relobj_file<64, false>::Symbols* sympointers,
size_t* defined);
#endif
const unsigned char* versym,
size_t versym_size,
const std::vector<const char*>* version_map,
- Sized_relobj<64, true>::Symbols* sympointers,
+ Sized_relobj_file<64, true>::Symbols* sympointers,
size_t* defined);
#endif
+#ifdef HAVE_TARGET_32_LITTLE
+template
+Sized_symbol<32>*
+Symbol_table::add_from_incrobj(
+ Object* obj,
+ const char* name,
+ const char* ver,
+ elfcpp::Sym<32, false>* sym);
+#endif
+
+#ifdef HAVE_TARGET_32_BIG
+template
+Sized_symbol<32>*
+Symbol_table::add_from_incrobj(
+ Object* obj,
+ const char* name,
+ const char* ver,
+ elfcpp::Sym<32, true>* sym);
+#endif
+
+#ifdef HAVE_TARGET_64_LITTLE
+template
+Sized_symbol<64>*
+Symbol_table::add_from_incrobj(
+ Object* obj,
+ const char* name,
+ const char* ver,
+ elfcpp::Sym<64, false>* sym);
+#endif
+
+#ifdef HAVE_TARGET_64_BIG
+template
+Sized_symbol<64>*
+Symbol_table::add_from_incrobj(
+ Object* obj,
+ const char* name,
+ const char* ver,
+ elfcpp::Sym<64, true>* sym);
+#endif
+
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
template
void
elfcpp::Elf_types<64>::Elf_Addr value);
#endif
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+template
+void
+Sized_symbol<32>::init_output_data(const char* name, const char* version,
+ Output_data* od, Value_type value,
+ Size_type symsize, elfcpp::STT type,
+ elfcpp::STB binding,
+ elfcpp::STV visibility,
+ unsigned char nonvis,
+ bool offset_is_from_end,
+ 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)
+template
+void
+Sized_symbol<64>::init_output_data(const char* name, const char* version,
+ Output_data* od, Value_type value,
+ Size_type symsize, elfcpp::STT type,
+ elfcpp::STB binding,
+ elfcpp::STV visibility,
+ unsigned char nonvis,
+ bool offset_is_from_end,
+ 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
template
void
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