// Symbol_table
// The symbol table.
+#ifndef GOLD_SYMTAB_H
+#define GOLD_SYMTAB_H
+
#include <string>
#include <utility>
#include <vector>
-#include "gc.h"
#include "elfcpp.h"
#include "parameters.h"
#include "stringpool.h"
#include "object.h"
-#ifndef GOLD_SYMTAB_H
-#define GOLD_SYMTAB_H
-
namespace gold
{
class Output_file;
class Output_symtab_xindex;
class Garbage_collection;
+class Icf;
// 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.
type() const
{ return this->type_; }
+ // Return true for function symbol.
+ bool
+ is_func() const
+ {
+ return (this->type_ == elfcpp::STT_FUNC
+ || this->type_ == elfcpp::STT_GNU_IFUNC);
+ }
+
// Return the symbol visibility.
elfcpp::STV
visibility() const
bool
final_value_is_known() const;
+ // Return true if SHNDX represents a common symbol. This depends on
+ // the target.
+ static bool
+ is_common_shndx(unsigned int shndx);
+
// Return whether this is a defined symbol (not undefined or
// common).
bool
unsigned int shndx = this->shndx(&is_ordinary);
return (is_ordinary
? shndx != elfcpp::SHN_UNDEF
- : shndx != elfcpp::SHN_COMMON);
+ : !Symbol::is_common_shndx(shndx));
}
// Return true if this symbol is from a dynamic object.
bool
is_common() const
{
+ if (this->type_ == elfcpp::STT_COMMON)
+ return true;
+ if (this->source_ != FROM_OBJECT)
+ return false;
bool is_ordinary;
- return (this->source_ == FROM_OBJECT
- && ((this->shndx(&is_ordinary) == elfcpp::SHN_COMMON
- && !is_ordinary)
- || this->type_ == elfcpp::STT_COMMON));
+ unsigned int shndx = this->shndx(&is_ordinary);
+ return !is_ordinary && Symbol::is_common_shndx(shndx);
}
// Return whether this symbol can be seen outside this object.
// Return true if this symbol is a function that needs a PLT entry.
// If the symbol is defined in a dynamic object or if it is subject
// to pre-emption, we need to make a PLT entry. If we're doing a
- // static link, we don't create PLT entries.
+ // static link or a -pie link, we don't create PLT entries.
bool
needs_plt_entry() const
{
+ // An undefined symbol from an executable does not need a PLT entry.
+ if (this->is_undefined() && !parameters->options().shared())
+ return false;
+
return (!parameters->doing_static_link()
- && this->type() == elfcpp::STT_FUNC
+ && !parameters->options().pie()
+ && this->is_func()
&& (this->is_from_dynobj()
|| this->is_undefined()
|| this->is_preemptible()));
if (parameters->doing_static_link())
return false;
- // A reference to a weak undefined symbol from an executable should be
+ // A reference to an 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())
+ if (this->is_undefined() && !parameters->options().shared())
return false;
// A reference to an absolute symbol does not need a dynamic relocation.
set_is_forced_local()
{ this->is_forced_local_ = true; }
+ // Return true if this may need a COPY relocation.
+ // References from an executable object to non-function symbols
+ // defined in a dynamic object may need a COPY relocation.
+ bool
+ may_need_copy_reloc() const
+ {
+ return (!parameters->options().shared()
+ && parameters->options().copyreloc()
+ && this->is_from_dynobj()
+ && !this->is_func());
+ }
+
protected:
// Instances of this class should always be created at a specific
// size.
~Symbol_table();
+ void
+ set_icf(Icf* icf)
+ { this->icf_ = icf;}
+
+ Icf*
+ icf() const
+ { return this->icf_; }
+
+ // Returns true if ICF determined that this is a duplicate section.
+ bool
+ is_section_folded(Object* obj, unsigned int shndx) const;
+
void
set_gc(Garbage_collection* gc)
{ this->gc_ = gc; }
Garbage_collection*
- gc()
+ gc() const
{ return this->gc_; }
// During garbage collection, this keeps undefined symbols.
finalize(off_t off, off_t dynoff, size_t dyn_global_index, size_t dyncount,
Stringpool* pool, unsigned int *plocal_symcount);
+ // Status code of Symbol_table::compute_final_value.
+ enum Compute_final_value_status
+ {
+ // No error.
+ CFVS_OK,
+ // Unspported symbol section.
+ CFVS_UNSUPPORTED_SYMBOL_SECTION,
+ // No output section.
+ CFVS_NO_OUTPUT_SECTION
+ };
+
+ // 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>
+ typename Sized_symbol<size>::Value_type
+ compute_final_value(const Sized_symbol<size>* sym,
+ Compute_final_value_status* pstatus) const;
+
// Write out the global symbols.
void
- write_globals(const Input_objects*, const Stringpool*, const Stringpool*,
+ write_globals(const Stringpool*, const Stringpool*,
Output_symtab_xindex*, Output_symtab_xindex*,
Output_file*) const;
// The type of the list of common symbols.
typedef std::vector<Symbol*> Commons_type;
+ // The type of the symbol hash table.
+
+ typedef std::pair<Stringpool::Key, Stringpool::Key> Symbol_table_key;
+
+ struct Symbol_table_hash
+ {
+ size_t
+ operator()(const Symbol_table_key&) const;
+ };
+
+ struct Symbol_table_eq
+ {
+ bool
+ operator()(const Symbol_table_key&, const Symbol_table_key&) const;
+ };
+
+ typedef Unordered_map<Symbol_table_key, Symbol*, Symbol_table_hash,
+ Symbol_table_eq> Symbol_table_type;
+
// Make FROM a forwarder symbol to TO.
void
make_forwarder(Symbol* from, Symbol* to);
unsigned int st_shndx, bool is_ordinary,
unsigned int orig_st_shndx);
+ // Define a default symbol.
+ template<int size, bool big_endian>
+ void
+ define_default_version(Sized_symbol<size>*, bool,
+ Symbol_table_type::iterator);
+
// Resolve symbols.
template<int size, bool big_endian>
void
// Adjust NAME and *NAME_KEY for wrapping.
const char*
- wrap_symbol(Object* object, const char*, Stringpool::Key* name_key);
+ wrap_symbol(const char* name, Stringpool::Key* name_key);
// Whether we should override a symbol, based on flags in
// resolve.cc.
static bool
should_override(const Symbol*, unsigned int, Object*, bool*);
+ // Report a problem in symbol resolution.
+ static void
+ report_resolve_problem(bool is_error, const char* msg, const Symbol* to,
+ Object* object);
+
// Override a symbol.
template<int size, bool big_endian>
void
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);
+ bool only_if_ref, Sized_symbol<size>** poldsym,
+ bool* resolve_oldsym);
// Define a symbol in an Output_data, sized version.
template<int size>
void
do_add_undefined_symbols_from_command_line();
+ // Types of common symbols.
+
+ enum Commons_section_type
+ {
+ COMMONS_NORMAL,
+ COMMONS_TLS,
+ COMMONS_SMALL,
+ COMMONS_LARGE
+ };
+
// Allocate the common symbols, sized version.
template<int size>
void
// Allocate the common symbols from one list.
template<int size>
void
- do_allocate_commons_list(Layout*, bool is_tls, Commons_type*, Mapfile*);
+ do_allocate_commons_list(Layout*, Commons_section_type, Commons_type*,
+ Mapfile*);
// Implement detect_odr_violations.
template<int size, bool big_endian>
// Write globals specialized for size and endianness.
template<int size, bool big_endian>
void
- sized_write_globals(const Input_objects*, const Stringpool*,
- const Stringpool*, Output_symtab_xindex*,
- Output_symtab_xindex*, Output_file*) const;
+ sized_write_globals(const Stringpool*, const Stringpool*,
+ Output_symtab_xindex*, Output_symtab_xindex*,
+ Output_file*) const;
// Write out a symbol to P.
template<int size, bool big_endian>
// Possibly warn about an undefined symbol from a dynamic object.
void
- warn_about_undefined_dynobj_symbol(const Input_objects*, Symbol*) const;
+ warn_about_undefined_dynobj_symbol(Symbol*) const;
// Write out a section symbol, specialized for size and endianness.
template<int size, bool big_endian>
sized_write_section_symbol(const Output_section*, Output_symtab_xindex*,
Output_file*, off_t) const;
- // The type of the symbol hash table.
-
- typedef std::pair<Stringpool::Key, Stringpool::Key> Symbol_table_key;
-
- struct Symbol_table_hash
- {
- size_t
- operator()(const Symbol_table_key&) const;
- };
-
- struct Symbol_table_eq
- {
- bool
- operator()(const Symbol_table_key&, const Symbol_table_key&) const;
- };
-
- typedef Unordered_map<Symbol_table_key, Symbol*, Symbol_table_hash,
- Symbol_table_eq> Symbol_table_type;
-
// The type of the list of symbols which have been forced local.
typedef std::vector<Symbol*> Forced_locals;
// This is like the commons_ field, except that it holds TLS common
// symbols.
Commons_type tls_commons_;
+ // This is for small common symbols.
+ Commons_type small_commons_;
+ // This is for large common symbols.
+ Commons_type large_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.
// Information parsed from the version script, if any.
const Version_script_info& version_script_;
Garbage_collection* gc_;
+ Icf* icf_;
};
// We inline get_sized_symbol for efficiency.
projects / deliverable / binutils-gdb.git / blobdiff