// symtab.h -- the gold symbol table -*- C++ -*-
-// Copyright 2006, 2007 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
namespace gold
{
+class Mapfile;
class Object;
class Relobj;
template<int size, bool big_endian>
class Output_section;
class Output_segment;
class Output_file;
+class Output_symtab_xindex;
// The base class of an entry in the symbol table. The symbol table
// can have a lot of entries, so we don't want this class to big.
// section.
IN_OUTPUT_SEGMENT,
// Symbol value is constant.
- CONSTANT
+ IS_CONSTANT,
+ // Symbol is undefined.
+ IS_UNDEFINED
};
// When the source is IN_OUTPUT_SEGMENT, we need to describe what
return this->is_def_;
}
- // Set whether this version is the default for this symbol name.
+ // Set that this version is the default for this symbol name.
void
- set_is_default(bool def)
- { this->is_def_ = def; }
+ set_is_default()
+ { this->is_def_ = true; }
// Return the symbol source.
Source
// Return the index of the section in the input relocatable or
// dynamic object file.
unsigned int
- shndx() const
+ shndx(bool* is_ordinary) const
{
gold_assert(this->source_ == FROM_OBJECT);
+ *is_ordinary = this->is_ordinary_shndx_;
return this->u_.from_object.shndx;
}
// Return whether this symbol has an entry in the GOT section.
// For a TLS symbol, this GOT entry will hold its tp-relative offset.
bool
- has_got_offset() const
- { return this->has_got_offset_; }
+ has_got_offset(unsigned int got_type) const
+ { return this->got_offsets_.get_offset(got_type) != -1U; }
// Return the offset into the GOT section of this symbol.
unsigned int
- got_offset() const
+ got_offset(unsigned int got_type) const
{
- gold_assert(this->has_got_offset());
- return this->got_offset_;
+ unsigned int got_offset = this->got_offsets_.get_offset(got_type);
+ gold_assert(got_offset != -1U);
+ return got_offset;
}
// Set the GOT offset of this symbol.
void
- set_got_offset(unsigned int got_offset)
- {
- this->has_got_offset_ = true;
- this->got_offset_ = got_offset;
- }
-
- // Return whether this TLS symbol has an entry in the GOT section for
- // its module index or, if NEED_PAIR is true, has a pair of entries
- // for its module index and dtv-relative offset.
- bool
- has_tls_got_offset(bool need_pair) const
- {
- return (this->has_tls_mod_got_offset_
- && (!need_pair || this->has_tls_pair_got_offset_));
- }
-
- // Return the offset into the GOT section for this symbol's TLS module
- // index or, if NEED_PAIR is true, for the pair of entries for the
- // module index and dtv-relative offset.
- unsigned int
- tls_got_offset(bool need_pair) const
- {
- gold_assert(this->has_tls_got_offset(need_pair));
- return this->tls_mod_got_offset_;
- }
-
- // Set the GOT offset of this symbol.
- void
- set_tls_got_offset(unsigned int got_offset, bool have_pair)
- {
- this->has_tls_mod_got_offset_ = true;
- this->has_tls_pair_got_offset_ = have_pair;
- this->tls_mod_got_offset_ = got_offset;
- }
+ set_got_offset(unsigned int got_type, unsigned int got_offset)
+ { this->got_offsets_.set_offset(got_type, got_offset); }
// Return whether this symbol has an entry in the PLT section.
bool
bool
is_defined() const
{
- return (this->source_ != FROM_OBJECT
- || (this->shndx() != elfcpp::SHN_UNDEF
- && this->shndx() != elfcpp::SHN_COMMON));
+ bool is_ordinary;
+ if (this->source_ != FROM_OBJECT)
+ return this->source_ != IS_UNDEFINED;
+ unsigned int shndx = this->shndx(&is_ordinary);
+ return (is_ordinary
+ ? shndx != elfcpp::SHN_UNDEF
+ : shndx != elfcpp::SHN_COMMON);
}
// Return true if this symbol is from a dynamic object.
bool
is_undefined() const
{
- return this->source_ == FROM_OBJECT && this->shndx() == elfcpp::SHN_UNDEF;
+ bool is_ordinary;
+ return ((this->source_ == FROM_OBJECT
+ && this->shndx(&is_ordinary) == elfcpp::SHN_UNDEF
+ && is_ordinary)
+ || this->source_ == IS_UNDEFINED);
+ }
+
+ // Return whether this is a weak undefined symbol.
+ bool
+ is_weak_undefined() const
+ { return this->is_undefined() && this->binding() == elfcpp::STB_WEAK; }
+
+ // Return whether this is an absolute symbol.
+ bool
+ is_absolute() const
+ {
+ bool is_ordinary;
+ return ((this->source_ == FROM_OBJECT
+ && this->shndx(&is_ordinary) == elfcpp::SHN_ABS
+ && !is_ordinary)
+ || this->source_ == IS_CONSTANT);
}
// Return whether this is a common symbol.
bool
is_common() const
{
+ bool is_ordinary;
return (this->source_ == FROM_OBJECT
- && (this->shndx() == elfcpp::SHN_COMMON
+ && ((this->shndx(&is_ordinary) == elfcpp::SHN_COMMON
+ && !is_ordinary)
|| this->type_ == elfcpp::STT_COMMON));
}
// is preemptible.
gold_assert(!this->is_undefined());
- return (this->visibility_ != elfcpp::STV_INTERNAL
- && this->visibility_ != elfcpp::STV_HIDDEN
- && this->visibility_ != elfcpp::STV_PROTECTED
- && !this->is_forced_local_
- && parameters->output_is_shared()
- && !parameters->Bsymbolic());
+ // If a symbol does not have default visibility, it can not be
+ // seen outside this link unit and therefore is not preemptible.
+ if (this->visibility_ != elfcpp::STV_DEFAULT)
+ return false;
+
+ // If this symbol has been forced to be a local symbol by a
+ // version script, then it is not visible outside this link unit
+ // and is not preemptible.
+ if (this->is_forced_local_)
+ return false;
+
+ // If we are not producing a shared library, then nothing is
+ // preemptible.
+ if (!parameters->options().shared())
+ return false;
+
+ // If the user used -Bsymbolic, then nothing is preemptible.
+ if (parameters->options().Bsymbolic())
+ return false;
+
+ // If the user used -Bsymbolic-functions, then functions are not
+ // preemptible. We explicitly check for not being STT_OBJECT,
+ // rather than for being STT_FUNC, because that is what the GNU
+ // linker does.
+ if (this->type() != elfcpp::STT_OBJECT
+ && parameters->options().Bsymbolic_functions())
+ return false;
+
+ // Otherwise the symbol is preemptible.
+ return true;
}
// Return true if this symbol is a function that needs a PLT entry.
if (parameters->doing_static_link())
return false;
+ // A reference to a weak undefined symbol from an executable should be
+ // statically resolved to 0, and does not need a dynamic relocation.
+ // This matches gnu ld behavior.
+ if (this->is_weak_undefined() && !parameters->options().shared())
+ return false;
+
+ // A reference to an absolute symbol does not need a dynamic relocation.
+ if (this->is_absolute())
+ return false;
+
// An absolute reference within a position-independent output file
// will need a dynamic relocation.
if ((flags & ABSOLUTE_REF)
- && parameters->output_is_position_independent())
+ && parameters->options().output_is_position_independent())
return true;
// A function call that can branch to a local PLT entry does not need
// shared library cannot use a PLT entry.
if ((flags & FUNCTION_CALL)
&& this->has_plt_offset()
- && !((flags & NON_PIC_REF) && parameters->output_is_shared()))
+ && !((flags & NON_PIC_REF) && parameters->options().shared()))
return false;
// A reference to any PLT entry in a non-position-independent executable
// does not need a dynamic relocation.
- if (!parameters->output_is_position_independent()
+ if (!parameters->options().output_is_position_independent()
&& this->has_plt_offset())
return false;
elfcpp::STT type, elfcpp::STB binding,
elfcpp::STV visibility, unsigned char nonvis);
- // Initialize fields from an ELF symbol in OBJECT.
+ // Initialize fields from an ELF symbol in OBJECT. ST_SHNDX is the
+ // section index, IS_ORDINARY is whether it is a normal section
+ // index rather than a special code.
template<int size, bool big_endian>
void
- init_base(const char *name, const char* version, Object* object,
- const elfcpp::Sym<size, big_endian>&);
+ init_base_object(const char *name, const char* version, Object* object,
+ const elfcpp::Sym<size, big_endian>&, unsigned int st_shndx,
+ bool is_ordinary);
// Initialize fields for an Output_data.
void
- init_base(const char* name, Output_data*, elfcpp::STT, elfcpp::STB,
- elfcpp::STV, unsigned char nonvis, bool offset_is_from_end);
+ init_base_output_data(const char* name, const char* version, Output_data*,
+ elfcpp::STT, elfcpp::STB, elfcpp::STV,
+ unsigned char nonvis, bool offset_is_from_end);
// Initialize fields for an Output_segment.
void
- init_base(const char* name, Output_segment* os, elfcpp::STT type,
- elfcpp::STB binding, elfcpp::STV visibility,
- unsigned char nonvis, Segment_offset_base offset_base);
+ init_base_output_segment(const char* name, const char* version,
+ Output_segment* os, elfcpp::STT type,
+ elfcpp::STB binding, elfcpp::STV visibility,
+ unsigned char nonvis,
+ Segment_offset_base offset_base);
// Initialize fields for a constant.
void
- init_base(const char* name, elfcpp::STT type, elfcpp::STB binding,
- elfcpp::STV visibility, unsigned char nonvis);
+ init_base_constant(const char* name, const char* version, elfcpp::STT type,
+ elfcpp::STB binding, elfcpp::STV visibility,
+ unsigned char nonvis);
+
+ // Initialize fields for an undefined symbol.
+ void
+ init_base_undefined(const char* name, const char* version, elfcpp::STT type,
+ elfcpp::STB binding, elfcpp::STV visibility,
+ unsigned char nonvis);
// Override existing symbol.
template<int size, bool big_endian>
void
- override_base(const elfcpp::Sym<size, big_endian>&, Object* object,
- const char* version);
+ override_base(const elfcpp::Sym<size, big_endian>&, unsigned int st_shndx,
+ bool is_ordinary, Object* object, const char* version);
// Override existing symbol with a special symbol.
void
override_base_with_special(const Symbol* from);
+ // Override symbol version.
+ void
+ override_version(const char* version);
+
// Allocate a common symbol by giving it a location in the output
// file.
void
unsigned int dynsym_index_;
// If this symbol has an entry in the GOT section (has_got_offset_
- // is true), this is the offset from the start of the GOT section.
- // For a TLS symbol, if has_tls_tpoff_got_offset_ is true, this
- // serves as the GOT offset for the GOT entry that holds its
- // TP-relative offset.
- unsigned int got_offset_;
-
- // If this is a TLS symbol and has an entry in the GOT section
- // for a module index or a pair of entries (module index,
- // dtv-relative offset), these are the offsets from the start
- // of the GOT section.
- unsigned int tls_mod_got_offset_;
- unsigned int tls_pair_got_offset_;
+ // is true), this holds the offset from the start of the GOT section.
+ // A symbol may have more than one GOT offset (e.g., when mixing
+ // modules compiled with two different TLS models), but will usually
+ // have at most one.
+ Got_offset_list got_offsets_;
// If this symbol has an entry in the PLT section (has_plt_offset_
// is true), then this is the offset from the start of the PLT
// section.
unsigned int plt_offset_;
- // Symbol type.
+ // Symbol type (bits 0 to 3).
elfcpp::STT type_ : 4;
- // Symbol binding.
+ // Symbol binding (bits 4 to 7).
elfcpp::STB binding_ : 4;
- // Symbol visibility.
+ // Symbol visibility (bits 8 to 9).
elfcpp::STV visibility_ : 2;
- // Rest of symbol st_other field.
+ // Rest of symbol st_other field (bits 10 to 15).
unsigned int nonvis_ : 6;
- // The type of symbol.
+ // The type of symbol (bits 16 to 18).
Source source_ : 3;
// True if this symbol always requires special target-specific
- // handling.
+ // handling (bit 19).
bool is_target_special_ : 1;
- // True if this is the default version of the symbol.
+ // True if this is the default version of the symbol (bit 20).
bool is_def_ : 1;
// True if this symbol really forwards to another symbol. This is
// used when we discover after the fact that two different entries
// never be set for a symbol found in the hash table, but may be set
// for a symbol found in the list of symbols attached to an Object.
// It forwards to the symbol found in the forwarders_ map of
- // Symbol_table.
+ // Symbol_table (bit 21).
bool is_forwarder_ : 1;
// True if the symbol has an alias in the weak_aliases table in
- // Symbol_table.
+ // Symbol_table (bit 22).
bool has_alias_ : 1;
- // True if this symbol needs to be in the dynamic symbol table.
+ // True if this symbol needs to be in the dynamic symbol table (bit
+ // 23).
bool needs_dynsym_entry_ : 1;
- // True if we've seen this symbol in a regular object.
+ // True if we've seen this symbol in a regular object (bit 24).
bool in_reg_ : 1;
- // True if we've seen this symbol in a dynamic object.
+ // True if we've seen this symbol in a dynamic object (bit 25).
bool in_dyn_ : 1;
- // True if the symbol has an entry in the GOT section.
- // For a TLS symbol, this GOT entry will hold its tp-relative offset.
- bool has_got_offset_ : 1;
- // True if the symbol has an entry in the GOT section for its
- // module index.
- bool has_tls_mod_got_offset_ : 1;
- // True if the symbol has a pair of entries in the GOT section for its
- // module index and dtv-relative offset.
- bool has_tls_pair_got_offset_ : 1;
- // True if the symbol has an entry in the PLT section.
+ // True if the symbol has an entry in the PLT section (bit 26).
bool has_plt_offset_ : 1;
// True if this is a dynamic symbol which needs a special value in
- // the dynamic symbol table.
+ // the dynamic symbol table (bit 27).
bool needs_dynsym_value_ : 1;
- // True if there is a warning for this symbol.
+ // True if there is a warning for this symbol (bit 28).
bool has_warning_ : 1;
// True if we are using a COPY reloc for this symbol, so that the
- // real definition lives in a dynamic object.
+ // real definition lives in a dynamic object (bit 29).
bool is_copied_from_dynobj_ : 1;
// True if this symbol was forced to local visibility by a version
- // script.
+ // script (bit 30).
bool is_forced_local_ : 1;
+ // True if the field u_.from_object.shndx is an ordinary section
+ // index, not one of the special codes from SHN_LORESERVE to
+ // SHN_HIRESERVE.
+ bool is_ordinary_shndx_ : 1;
};
// The parts of a symbol which are size specific. Using a template
Sized_symbol()
{ }
- // Initialize fields from an ELF symbol in OBJECT.
+ // Initialize fields from an ELF symbol in OBJECT. ST_SHNDX is the
+ // section index, IS_ORDINARY is whether it is a normal section
+ // index rather than a special code.
template<bool big_endian>
void
- init(const char *name, const char* version, Object* object,
- const elfcpp::Sym<size, big_endian>&);
+ init_object(const char *name, const char* version, Object* object,
+ const elfcpp::Sym<size, big_endian>&, unsigned int st_shndx,
+ bool is_ordinary);
// Initialize fields for an Output_data.
void
- init(const char* name, Output_data*, Value_type value, Size_type symsize,
- elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis,
- bool offset_is_from_end);
+ init_output_data(const char* name, const char* version, Output_data*,
+ Value_type value, Size_type symsize, elfcpp::STT,
+ elfcpp::STB, elfcpp::STV, unsigned char nonvis,
+ bool offset_is_from_end);
// Initialize fields for an Output_segment.
void
- init(const char* name, Output_segment*, Value_type value, Size_type symsize,
- elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis,
- Segment_offset_base offset_base);
+ init_output_segment(const char* name, const char* version, Output_segment*,
+ Value_type value, Size_type symsize, elfcpp::STT,
+ elfcpp::STB, elfcpp::STV, unsigned char nonvis,
+ Segment_offset_base offset_base);
// Initialize fields for a constant.
void
- init(const char* name, Value_type value, Size_type symsize,
- elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis);
+ init_constant(const char* name, const char* version, Value_type value,
+ Size_type symsize, elfcpp::STT, elfcpp::STB, elfcpp::STV,
+ unsigned char nonvis);
+
+ // Initialize fields for an undefined symbol.
+ void
+ init_undefined(const char* name, const char* version, elfcpp::STT,
+ elfcpp::STB, elfcpp::STV, unsigned char nonvis);
// Override existing symbol.
template<bool big_endian>
void
- override(const elfcpp::Sym<size, big_endian>&, Object* object,
- const char* version);
+ override(const elfcpp::Sym<size, big_endian>&, unsigned int st_shndx,
+ bool is_ordinary, Object* object, const char* version);
// Override existing symbol with a special symbol.
void
~Symbol_table();
// Add COUNT external symbols from the relocatable object RELOBJ to
- // the symbol table. SYMS is the symbols, SYM_NAMES is their names,
- // SYM_NAME_SIZE is the size of SYM_NAMES. This sets SYMPOINTERS to
- // point to the symbols in the symbol table.
+ // the symbol table. SYMS is the symbols, SYMNDX_OFFSET is the
+ // offset in the symbol table of the first symbol, SYM_NAMES is
+ // their names, SYM_NAME_SIZE is the size of SYM_NAMES. This sets
+ // SYMPOINTERS to point to the symbols in the symbol table.
template<int size, bool big_endian>
void
add_from_relobj(Sized_relobj<size, big_endian>* relobj,
const unsigned char* syms, size_t count,
- const char* sym_names, size_t sym_name_size,
+ size_t symndx_offset, const char* sym_names,
+ size_t sym_name_size,
typename Sized_relobj<size, big_endian>::Symbols*);
// Add COUNT dynamic symbols from the dynamic object DYNOBJ to the
// Return the sized version of a symbol in this table.
template<int size>
Sized_symbol<size>*
- get_sized_symbol(Symbol* ACCEPT_SIZE) const;
+ get_sized_symbol(Symbol*) const;
template<int size>
const Sized_symbol<size>*
- get_sized_symbol(const Symbol* ACCEPT_SIZE) const;
+ get_sized_symbol(const Symbol*) const;
// Return the count of undefined symbols seen.
int
// Allocate the common symbols
void
- allocate_commons(const General_options&, Layout*);
+ allocate_commons(Layout*, Mapfile*);
// Add a warning for symbol NAME in object OBJ. WARNING is the text
// of the warning.
void
detect_odr_violations(const Task*, const char* output_file_name) const;
+ // Add any undefined symbols named on the command line to the symbol
+ // table.
+ void
+ add_undefined_symbols_from_command_line();
+
// SYM is defined using a COPY reloc. Return the dynamic object
// where the original definition was found.
Dynobj*
// Write out the global symbols.
void
write_globals(const Input_objects*, const Stringpool*, const Stringpool*,
+ Output_symtab_xindex*, Output_symtab_xindex*,
Output_file*) const;
// Write out a section symbol. Return the updated offset.
void
- write_section_symbol(const Output_section*, Output_file*, off_t) const;
+ write_section_symbol(const Output_section*, Output_symtab_xindex*,
+ Output_file*, off_t) const;
// Dump statistical information to stderr.
void
Symbol_table(const Symbol_table&);
Symbol_table& operator=(const Symbol_table&);
+ // The type of the list of common symbols.
+ typedef std::vector<Symbol*> Commons_type;
+
// Make FROM a forwarder symbol to TO.
void
make_forwarder(Symbol* from, Symbol* to);
add_from_object(Object*, const char *name, Stringpool::Key name_key,
const char *version, Stringpool::Key version_key,
bool def, const elfcpp::Sym<size, big_endian>& sym,
- const elfcpp::Sym<size, big_endian>& orig_sym);
+ unsigned int st_shndx, bool is_ordinary,
+ unsigned int orig_st_shndx);
// Resolve symbols.
template<int size, bool big_endian>
void
resolve(Sized_symbol<size>* to,
const elfcpp::Sym<size, big_endian>& sym,
- const elfcpp::Sym<size, big_endian>& orig_sym,
+ unsigned int st_shndx, bool is_ordinary,
+ unsigned int orig_st_shndx,
Object*, const char* version);
template<int size, bool big_endian>
void
resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from,
- const char* version ACCEPT_SIZE_ENDIAN);
+ const char* version);
// Record that a symbol is forced to be local by a version script.
void
force_local(Symbol*);
+ // Adjust NAME and *NAME_KEY for wrapping.
+ const char*
+ wrap_symbol(Object* object, const char*, Stringpool::Key* name_key);
+
// Whether we should override a symbol, based on flags in
// resolve.cc.
static bool
void
override(Sized_symbol<size>* tosym,
const elfcpp::Sym<size, big_endian>& fromsym,
+ unsigned int st_shndx, bool is_ordinary,
Object* object, const char* version);
// Whether we should override a symbol with a special symbol which
template<int size, bool big_endian>
Sized_symbol<size>*
define_special_symbol(const char** pname, const char** pversion,
- bool only_if_ref, Sized_symbol<size>** poldsym
- ACCEPT_SIZE_ENDIAN);
+ bool only_if_ref, Sized_symbol<size>** poldsym);
// Define a symbol in an Output_data, sized version.
template<int size>
elfcpp::STV visibility, unsigned char nonvis,
bool only_if_ref, bool force_override);
+ // Add any undefined symbols named on the command line to the symbol
+ // table, sized version.
+ template<int size>
+ void
+ do_add_undefined_symbols_from_command_line();
+
// Allocate the common symbols, sized version.
template<int size>
void
- do_allocate_commons(const General_options&, Layout*);
+ do_allocate_commons(Layout*, Mapfile*);
+
+ // Allocate the common symbols from one list.
+ template<int size>
+ void
+ do_allocate_commons_list(Layout*, bool is_tls, Commons_type*, Mapfile*);
// Implement detect_odr_violations.
template<int size, bool big_endian>
template<int size, bool big_endian>
void
sized_write_globals(const Input_objects*, const Stringpool*,
- const Stringpool*, Output_file*) const;
+ const Stringpool*, Output_symtab_xindex*,
+ Output_symtab_xindex*, Output_file*) const;
// Write out a symbol to P.
template<int size, bool big_endian>
sized_write_symbol(Sized_symbol<size>*,
typename elfcpp::Elf_types<size>::Elf_Addr value,
unsigned int shndx,
- const Stringpool*, unsigned char* p
- ACCEPT_SIZE_ENDIAN) const;
+ const Stringpool*, unsigned char* p) const;
// Possibly warn about an undefined symbol from a dynamic object.
void
// Write out a section symbol, specialized for size and endianness.
template<int size, bool big_endian>
void
- sized_write_section_symbol(const Output_section*, Output_file*, off_t) const;
+ sized_write_section_symbol(const Output_section*, Output_symtab_xindex*,
+ Output_file*, off_t) const;
// The type of the symbol hash table.
typedef Unordered_map<Symbol_table_key, Symbol*, Symbol_table_hash,
Symbol_table_eq> Symbol_table_type;
- // The type of the list of common symbols.
- typedef std::vector<Symbol*> Commons_type;
-
// The type of the list of symbols which have been forced local.
typedef std::vector<Symbol*> Forced_locals;
// symbol is no longer a common symbol. It may also have become a
// forwarder.
Commons_type commons_;
+ // This is like the commons_ field, except that it holds TLS common
+ // symbols.
+ Commons_type tls_commons_;
// A list of symbols which have been forced to be local. We don't
// expect there to be very many of them, so we keep a list of them
// rather than walking the whole table to find them.
template<int size>
Sized_symbol<size>*
-Symbol_table::get_sized_symbol(Symbol* sym ACCEPT_SIZE) const
+Symbol_table::get_sized_symbol(Symbol* sym) const
{
- gold_assert(size == parameters->get_size());
+ gold_assert(size == parameters->target().get_size());
return static_cast<Sized_symbol<size>*>(sym);
}
template<int size>
const Sized_symbol<size>*
-Symbol_table::get_sized_symbol(const Symbol* sym ACCEPT_SIZE) const
+Symbol_table::get_sized_symbol(const Symbol* sym) const
{
- gold_assert(size == parameters->get_size());
+ gold_assert(size == parameters->target().get_size());
return static_cast<const Sized_symbol<size>*>(sym);
}
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