// symtab.h -- the gold symbol table -*- C++ -*-
-// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
// Symbol_table
// The symbol table.
+#ifndef GOLD_SYMTAB_H
+#define GOLD_SYMTAB_H
+
#include <string>
#include <utility>
#include <vector>
#include "stringpool.h"
#include "object.h"
-#ifndef GOLD_SYMTAB_H
-#define GOLD_SYMTAB_H
-
namespace gold
{
+class Mapfile;
class Object;
class Relobj;
template<int size, bool big_endian>
class Sized_relobj;
+template<int size, bool big_endian>
+class Sized_pluginobj;
class Dynobj;
template<int size, bool big_endian>
class Sized_dynobj;
class Output_section;
class Output_segment;
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.
// 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 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;
}
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
{ return this->visibility_; }
+ // Set the visibility.
+ void
+ set_visibility(elfcpp::STV visibility)
+ { this->visibility_ = visibility; }
+
+ // Override symbol visibility.
+ void
+ override_visibility(elfcpp::STV);
+
// Return the non-visibility part of the st_other field.
unsigned char
nonvis() const
needs_dynsym_entry() const
{
return (this->needs_dynsym_entry_
- || (this->in_reg() && this->in_dyn()));
+ || (this->in_reg()
+ && this->in_dyn()
+ && this->is_externally_visible()));
}
// Mark this symbol as needing an entry in the dynamic symbol table.
set_in_dyn()
{ this->in_dyn_ = true; }
+ // Return whether this symbol has been seen in a real ELF object.
+ // (IN_REG will return TRUE if the symbol has been seen in either
+ // a real ELF object or an object claimed by a plugin.)
+ bool
+ in_real_elf() const
+ { return this->in_real_elf_; }
+
+ // Mark this symbol as having been seen in a real ELF object.
+ void
+ set_in_real_elf()
+ { this->in_real_elf_ = true; }
+
// Return the index of this symbol in the output file symbol table.
// A value of -1U means that this symbol is not going into the
// output file. This starts out as zero, and is set to a non-zero
// 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
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
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
+ : !Symbol::is_common_shndx(shndx));
}
// 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
{
- return (this->source_ == FROM_OBJECT
- && (this->shndx() == elfcpp::SHN_COMMON
- || this->type_ == elfcpp::STT_COMMON));
+ if (this->source_ != FROM_OBJECT)
+ return false;
+ if (this->type_ == elfcpp::STT_COMMON)
+ return true;
+ bool is_ordinary;
+ 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.
// 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->options().shared()
- && !parameters->options().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 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 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_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)
return false;
}
+ // Whether we should use the PLT offset associated with a symbol for
+ // a relocation. IS_NON_PIC_REFERENCE is true if this is a non-PIC
+ // reloc--the same set of relocs for which we would pass NON_PIC_REF
+ // to the needs_dynamic_reloc function.
+
+ bool
+ use_plt_offset(bool is_non_pic_reference) const
+ {
+ // If the symbol doesn't have a PLT offset, then naturally we
+ // don't want to use it.
+ if (!this->has_plt_offset())
+ return false;
+
+ // If we are going to generate a dynamic relocation, then we will
+ // wind up using that, so no need to use the PLT entry.
+ if (this->needs_dynamic_reloc(FUNCTION_CALL
+ | (is_non_pic_reference
+ ? NON_PIC_REF
+ : 0)))
+ return false;
+
+ // If the symbol is from a dynamic object, we need to use the PLT
+ // entry.
+ if (this->is_from_dynobj())
+ return true;
+
+ // If we are generating a shared object, and this symbol is
+ // undefined or preemptible, we need to use the PLT entry.
+ if (parameters->options().shared()
+ && (this->is_undefined() || this->is_preemptible()))
+ return true;
+
+ // If this is a weak undefined symbol, we need to use the PLT
+ // entry; the symbol may be defined by a library loaded at
+ // runtime.
+ if (this->is_weak_undefined())
+ return true;
+
+ // Otherwise we can use the regular definition.
+ return false;
+ }
+
// Given a direct absolute static relocation against
// the global symbol, where a dynamic relocation is needed, this
// function returns whether a relative dynamic relocation can be used.
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.
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 (bit 31).
+ bool is_ordinary_shndx_ : 1;
+ // True if we've seen this symbol in a real ELF object.
+ bool in_real_elf_ : 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
class Symbol_table
{
public:
+ // The different places where a symbol definition can come from.
+ enum Defined
+ {
+ // Defined in an object file--the normal case.
+ OBJECT,
+ // Defined for a COPY reloc.
+ COPY,
+ // Defined on the command line using --defsym.
+ DEFSYM,
+ // Defined (so to speak) on the command line using -u.
+ UNDEFINED,
+ // Defined in a linker script.
+ SCRIPT,
+ // Predefined by the linker.
+ PREDEFINED,
+ };
+
+ // The order in which we sort common symbols.
+ enum Sort_commons_order
+ {
+ SORT_COMMONS_BY_SIZE_DESCENDING,
+ SORT_COMMONS_BY_ALIGNMENT_DESCENDING,
+ SORT_COMMONS_BY_ALIGNMENT_ASCENDING
+ };
+
// COUNT is an estimate of how many symbosl will be inserted in the
// symbol table. It's ok to put 0 if you don't know; a correct
// guess will just save some CPU by reducing hashtable resizes.
~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() const
+ { return this->gc_; }
+
+ // During garbage collection, this keeps undefined symbols.
+ void
+ gc_mark_undef_symbols();
+
+ // During garbage collection, this ensures externally visible symbols
+ // are not treated as garbage while building shared objects.
+ void
+ gc_mark_symbol_for_shlib(Symbol* sym);
+
+ // During garbage collection, this keeps sections that correspond to
+ // symbols seen in dynamic objects.
+ inline void
+ gc_mark_dyn_syms(Symbol* sym);
+
// 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. It sets
+ // *DEFINED to the number of defined symbols.
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,
- typename Sized_relobj<size, big_endian>::Symbols*);
+ size_t symndx_offset, const char* sym_names,
+ size_t sym_name_size,
+ typename Sized_relobj<size, big_endian>::Symbols*,
+ size_t* defined);
+
+ // Add one external symbol from the plugin object OBJ to the symbol table.
+ // Returns a pointer to the resolved symbol in the symbol table.
+ template<int size, bool big_endian>
+ Symbol*
+ add_from_pluginobj(Sized_pluginobj<size, big_endian>* obj,
+ const char* name, const char* ver,
+ elfcpp::Sym<size, big_endian>* sym);
// Add COUNT dynamic symbols from the dynamic object DYNOBJ to the
// symbol table. SYMS is the symbols. SYM_NAMES is their names.
const unsigned char* syms, size_t count,
const char* sym_names, size_t sym_name_size,
const unsigned char* versym, size_t versym_size,
- const std::vector<const char*>*);
+ const std::vector<const char*>*,
+ typename Sized_relobj<size, big_endian>::Symbols*,
+ size_t* defined);
// Define a special symbol based on an Output_data. It is a
// multiple definition error if this symbol is already defined.
Symbol*
- define_in_output_data(const char* name, const char* version,
+ define_in_output_data(const char* name, const char* version, Defined,
Output_data*, uint64_t value, uint64_t symsize,
elfcpp::STT type, elfcpp::STB binding,
elfcpp::STV visibility, unsigned char nonvis,
// Define a special symbol based on an Output_segment. It is a
// multiple definition error if this symbol is already defined.
Symbol*
- define_in_output_segment(const char* name, const char* version,
+ define_in_output_segment(const char* name, const char* version, Defined,
Output_segment*, uint64_t value, uint64_t symsize,
elfcpp::STT type, elfcpp::STB binding,
elfcpp::STV visibility, unsigned char nonvis,
// Define a special symbol with a constant value. It is a multiple
// definition error if this symbol is already defined.
Symbol*
- define_as_constant(const char* name, const char* version,
+ define_as_constant(const char* name, const char* version, Defined,
uint64_t value, uint64_t symsize, elfcpp::STT type,
elfcpp::STB binding, elfcpp::STV visibility,
unsigned char nonvis, bool only_if_ref,
// 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*
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;
// 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;
+
+ // 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);
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);
+
+ // 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
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);
+ resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from);
- // 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
force_local(Symbol*);
+ // Adjust NAME and *NAME_KEY for wrapping.
+ const char*
+ 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*);
+ should_override(const Symbol*, unsigned int, Defined, Object*, bool*);
+
+ // Report a problem in symbol resolution.
+ static void
+ report_resolve_problem(bool is_error, const char* msg, const Symbol* to,
+ Defined, Object* object);
// Override a symbol.
template<int size, bool big_endian>
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
// is automatically defined by the linker.
static bool
- should_override_with_special(const Symbol*);
+ should_override_with_special(const Symbol*, Defined);
// Override a symbol with a special symbol.
template<int size>
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>
Sized_symbol<size>*
- do_define_in_output_data(const char* name, const char* version, Output_data*,
+ do_define_in_output_data(const char* name, const char* version, Defined,
+ Output_data*,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_WXword ssize,
elfcpp::STT type, elfcpp::STB binding,
template<int size>
Sized_symbol<size>*
do_define_in_output_segment(
- const char* name, const char* version, Output_segment* os,
+ const char* name, const char* version, Defined, Output_segment* os,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_WXword ssize,
elfcpp::STT type, elfcpp::STB binding,
template<int size>
Sized_symbol<size>*
do_define_as_constant(
- const char* name, const char* version,
+ const char* name, const char* version, Defined,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_WXword ssize,
elfcpp::STT type, elfcpp::STB binding,
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();
+
+ // 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
- do_allocate_commons(const General_options&, Layout*);
+ do_allocate_commons(Layout*, Mapfile*, Sort_commons_order);
+
+ // Allocate the common symbols from one list.
+ template<int size>
+ void
+ do_allocate_commons_list(Layout*, Commons_section_type, Commons_type*,
+ Mapfile*, Sort_commons_order);
// 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_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>
void
- sized_write_section_symbol(const Output_section*, 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 common symbols.
- typedef std::vector<Symbol*> Commons_type;
+ sized_write_section_symbol(const Output_section*, Output_symtab_xindex*,
+ Output_file*, off_t) const;
// 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_;
+ // 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.
Copied_symbol_dynobjs copied_symbol_dynobjs_;
// 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.
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