// symtab.h -- the gold symbol table -*- C++ -*-
+// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+// Written by Ian Lance Taylor <iant@google.com>.
+
+// This file is part of gold.
+
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+// MA 02110-1301, USA.
+
// Symbol_table
// The symbol table.
+#ifndef GOLD_SYMTAB_H
+#define GOLD_SYMTAB_H
+
#include <string>
#include <utility>
#include <vector>
-#include <cassert>
#include "elfcpp.h"
+#include "parameters.h"
#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 Versions;
+class Version_script_info;
+class Input_objects;
class Output_data;
+class Output_section;
class Output_segment;
class Output_file;
-class Target;
+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
name() const
{ return this->name_; }
+ // Return the (ANSI) demangled version of the name, if
+ // parameters.demangle() is true. Otherwise, return the name. This
+ // is intended to be used only for logging errors, so it's not
+ // super-efficient.
+ std::string
+ demangled_name() const;
+
// Return the symbol version. This will return NULL for an
// unversioned symbol.
const char*
version() const
{ return this->version_; }
+ // Return whether this version is the default for this symbol name
+ // (eg, "foo@@V2" is a default version; "foo@V1" is not). Only
+ // meaningful for versioned symbols.
+ bool
+ is_default() const
+ {
+ gold_assert(this->version_ != NULL);
+ return this->is_def_;
+ }
+
+ // Set that this version is the default for this symbol name.
+ void
+ set_is_default()
+ { this->is_def_ = true; }
+
// Return the symbol source.
Source
source() const
Object*
object() const
{
- assert(this->source_ == FROM_OBJECT);
+ gold_assert(this->source_ == FROM_OBJECT);
return this->u_.from_object.object;
}
// Return the index of the section in the input relocatable or
// dynamic object file.
unsigned int
- shnum() const
+ shndx(bool* is_ordinary) const
{
- assert(this->source_ == FROM_OBJECT);
- return this->u_.from_object.shnum;
+ gold_assert(this->source_ == FROM_OBJECT);
+ *is_ordinary = this->is_ordinary_shndx_;
+ return this->u_.from_object.shndx;
}
// Return the output data section with which this symbol is
Output_data*
output_data() const
{
- assert(this->source_ == IN_OUTPUT_DATA);
+ gold_assert(this->source_ == IN_OUTPUT_DATA);
return this->u_.in_output_data.output_data;
}
bool
offset_is_from_end() const
{
- assert(this->source_ == IN_OUTPUT_DATA);
+ gold_assert(this->source_ == IN_OUTPUT_DATA);
return this->u_.in_output_data.offset_is_from_end;
}
Output_segment*
output_segment() const
{
- assert(this->source_ == IN_OUTPUT_SEGMENT);
+ gold_assert(this->source_ == IN_OUTPUT_SEGMENT);
return this->u_.in_output_segment.output_segment;
}
Segment_offset_base
offset_base() const
{
- assert(this->source_ == IN_OUTPUT_SEGMENT);
+ gold_assert(this->source_ == IN_OUTPUT_SEGMENT);
return this->u_.in_output_segment.offset_base;
}
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);
+
+ // Set whether the symbol was originally a weak undef or a regular undef
+ // when resolved by a dynamic def.
+ inline void
+ set_undef_binding(elfcpp::STB bind)
+ {
+ if (!this->undef_binding_set_ || this->undef_binding_weak_)
+ {
+ this->undef_binding_weak_ = bind == elfcpp::STB_WEAK;
+ this->undef_binding_set_ = true;
+ }
+ }
+
+ // Return TRUE if a weak undef was resolved by a dynamic def.
+ inline bool
+ is_undef_binding_weak() const
+ { return this->undef_binding_weak_; }
+
// Return the non-visibility part of the st_other field.
unsigned char
nonvis() const
set_forwarder()
{ this->is_forwarder_ = true; }
+ // Return whether this symbol has an alias in the weak aliases table
+ // in Symbol_table.
+ bool
+ has_alias() const
+ { return this->has_alias_; }
+
+ // Mark this symbol as having an alias.
+ void
+ set_has_alias()
+ { this->has_alias_ = true; }
+
// Return whether this symbol needs an entry in the dynamic symbol
// table.
bool
needs_dynsym_entry() const
- { return this->needs_dynsym_entry_; }
+ {
+ return (this->needs_dynsym_entry_
+ || (this->in_reg()
+ && this->in_dyn()
+ && this->is_externally_visible()));
+ }
// Mark this symbol as needing an entry in the dynamic symbol table.
void
set_needs_dynsym_entry()
{ this->needs_dynsym_entry_ = true; }
- // Return whether this symbol was ever seen in a dynamic object.
+ // Return whether this symbol should be added to the dynamic symbol
+ // table.
+ bool
+ should_add_dynsym_entry(Symbol_table*) const;
+
+ // Return whether this symbol has been seen in a regular object.
+ bool
+ in_reg() const
+ { return this->in_reg_; }
+
+ // Mark this symbol as having been seen in a regular object.
+ void
+ set_in_reg()
+ { this->in_reg_ = true; }
+
+ // Return whether this symbol has been seen in a dynamic object.
bool
in_dyn() const
{ return this->in_dyn_; }
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 whether this symbol was defined in a section that was
+ // discarded from the link. This is used to control some error
+ // reporting.
+ bool
+ is_defined_in_discarded_section() const
+ { return this->is_defined_in_discarded_section_; }
+
+ // Mark this symbol as having been defined in a discarded section.
+ void
+ set_is_defined_in_discarded_section()
+ { this->is_defined_in_discarded_section_ = 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
unsigned int
symtab_index() const
{
- assert(this->symtab_index_ != 0);
+ gold_assert(this->symtab_index_ != 0);
return this->symtab_index_;
}
void
set_symtab_index(unsigned int index)
{
- assert(index != 0);
+ gold_assert(index != 0);
this->symtab_index_ = index;
}
+ // Return whether this symbol already has an index in the output
+ // file symbol table.
+ bool
+ has_symtab_index() const
+ { return this->symtab_index_ != 0; }
+
// Return the index of this symbol in the dynamic symbol table. A
// value of -1U means that this symbol is not going into the dynamic
// symbol table. This starts out as zero, and is set to a non-zero
unsigned int
dynsym_index() const
{
- assert(this->dynsym_index_ != 0);
+ gold_assert(this->dynsym_index_ != 0);
return this->dynsym_index_;
}
void
set_dynsym_index(unsigned int index)
{
- assert(index != 0);
+ gold_assert(index != 0);
this->dynsym_index_ = index;
}
+ // Return whether this symbol already has an index in the dynamic
+ // symbol table.
+ bool
+ has_dynsym_index() const
+ { return this->dynsym_index_ != 0; }
+
// 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
{
- 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)
+ 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
+ has_plt_offset() const
+ { return this->plt_offset_ != -1U; }
+
+ // Return the offset into the PLT section of this symbol.
+ unsigned int
+ plt_offset() const
+ {
+ gold_assert(this->has_plt_offset());
+ return this->plt_offset_;
+ }
+
+ // Set the PLT offset of this symbol.
+ void
+ set_plt_offset(unsigned int plt_offset)
{
- this->has_got_offset_ = true;
- this->got_offset_ = got_offset;
+ gold_assert(plt_offset != -1U);
+ this->plt_offset_ = plt_offset;
}
- // Return whether this symbol is resolved locally. This is always
- // true when linking statically. It is true for a symbol defined in
- // this object when using -Bsymbolic. It is true for a symbol
- // marked local in a version file. FIXME: This needs to be
- // completed.
+ // Return whether this dynamic symbol needs a special value in the
+ // dynamic symbol table.
bool
- is_resolved_locally() const
- { return !this->in_dyn_; }
+ needs_dynsym_value() const
+ { return this->needs_dynsym_value_; }
+
+ // Set that this dynamic symbol needs a special value in the dynamic
+ // symbol table.
+ void
+ set_needs_dynsym_value()
+ {
+ gold_assert(this->object()->is_dynamic());
+ this->needs_dynsym_value_ = true;
+ }
+
+ // Return true if the final value of this symbol is known at link
+ // time.
+ 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->u_.from_object.shnum != elfcpp::SHN_UNDEF
- && this->u_.from_object.shnum != 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_from_dynobj() const
+ {
+ return this->source_ == FROM_OBJECT && this->object()->is_dynamic();
+ }
+
+ // Return whether this is a placeholder symbol from a plugin object.
+ bool
+ is_placeholder() const
+ {
+ return this->source_ == FROM_OBJECT && this->object()->pluginobj() != NULL;
}
// Return whether this is an undefined symbol.
bool
is_undefined() const
{
- return this->source_ == FROM_OBJECT && this->shnum() == 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->u_.from_object.shnum == 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.
+ bool
+ is_externally_visible() const
+ {
+ return (this->visibility_ == elfcpp::STV_DEFAULT
+ || this->visibility_ == elfcpp::STV_PROTECTED);
+ }
+
+ // Return true if this symbol can be preempted by a definition in
+ // another link unit.
+ bool
+ is_preemptible() const
+ {
+ // It doesn't make sense to ask whether a symbol defined in
+ // another object is preemptible.
+ gold_assert(!this->is_from_dynobj());
+
+ // It doesn't make sense to ask whether an undefined symbol
+ // is preemptible.
+ gold_assert(!this->is_undefined());
+
+ // 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 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()
+ && !parameters->options().pie()
+ && this->is_func()
+ && (this->is_from_dynobj()
+ || this->is_undefined()
+ || this->is_preemptible()));
+ }
+
+ // When determining whether a reference to a symbol needs a dynamic
+ // relocation, we need to know several things about the reference.
+ // These flags may be or'ed together.
+ enum Reference_flags
+ {
+ // Reference to the symbol's absolute address.
+ ABSOLUTE_REF = 1,
+ // A non-PIC reference.
+ NON_PIC_REF = 2,
+ // A function call.
+ FUNCTION_CALL = 4
+ };
+
+ // Given a direct absolute or pc-relative static relocation against
+ // the global symbol, this function returns whether a dynamic relocation
+ // is needed.
+
+ bool
+ needs_dynamic_reloc(int flags) const
+ {
+ // No dynamic relocations in a static link!
+ 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)
+ && parameters->options().output_is_position_independent())
+ return true;
+
+ // A function call that can branch to a local PLT entry does not need
+ // a dynamic relocation. A non-pic pc-relative function call in a
+ // shared library cannot use a PLT entry.
+ if ((flags & FUNCTION_CALL)
+ && this->has_plt_offset()
+ && !((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->options().output_is_position_independent()
+ && this->has_plt_offset())
+ return false;
+
+ // A reference to a symbol defined in a dynamic object or to a
+ // symbol that is preemptible will need a dynamic relocation.
+ if (this->is_from_dynobj()
+ || this->is_undefined()
+ || this->is_preemptible())
+ return true;
+
+ // For all other cases, return FALSE.
+ 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.
+ // The caller must determine separately whether the static relocation
+ // is compatible with a relative relocation.
+
+ bool
+ can_use_relative_reloc(bool is_function_call) const
+ {
+ // A function call that can branch to a local PLT entry can
+ // use a RELATIVE relocation.
+ if (is_function_call && this->has_plt_offset())
+ return true;
+
+ // A reference to a symbol defined in a dynamic object or to a
+ // symbol that is preemptible can not use a RELATIVE relocaiton.
+ if (this->is_from_dynobj()
+ || this->is_undefined()
+ || this->is_preemptible())
+ return false;
+
+ // For all other cases, return TRUE.
+ return true;
+ }
+
+ // Return the output section where this symbol is defined. Return
+ // NULL if the symbol has an absolute value.
+ Output_section*
+ output_section() const;
+
+ // Set the symbol's output section. This is used for symbols
+ // defined in scripts. This should only be called after the symbol
+ // table has been finalized.
+ void
+ set_output_section(Output_section*);
+
// Return whether there should be a warning for references to this
// symbol.
bool
set_has_warning()
{ this->has_warning_ = true; }
+ // Return whether this symbol is defined by a COPY reloc from a
+ // dynamic object.
+ bool
+ is_copied_from_dynobj() const
+ { return this->is_copied_from_dynobj_; }
+
+ // Mark this symbol as defined by a COPY reloc.
+ void
+ set_is_copied_from_dynobj()
+ { this->is_copied_from_dynobj_ = true; }
+
+ // Return whether this symbol is forced to visibility STB_LOCAL
+ // by a "local:" entry in a version script.
+ bool
+ is_forced_local() const
+ { return this->is_forced_local_; }
+
+ // Mark this symbol as forced to STB_LOCAL visibility.
+ void
+ 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);
+ 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
+ allocate_base_common(Output_data*);
private:
Symbol(const Symbol&);
// seen.
Object* object;
// Section number in object_ in which symbol is defined.
- unsigned int shnum;
+ unsigned int shndx;
} from_object;
// This struct is used if SOURCE_ == IN_OUTPUT_DATA.
// non-zero value during Layout::finalize.
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.
- unsigned int got_offset_;
+ // The GOT section entries for this symbol. 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, then this is the
+ // offset from the start of the PLT section. This is -1U if there
+ // is no PLT entry.
+ 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.
- 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 19).
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 20).
bool is_forwarder_ : 1;
- // True if this symbol needs to be in the dynamic symbol table.
+ // True if the symbol has an alias in the weak_aliases table in
+ // Symbol_table (bit 21).
+ bool has_alias_ : 1;
+ // True if this symbol needs to be in the dynamic symbol table (bit
+ // 22).
bool needs_dynsym_entry_ : 1;
- // True if we've seen this symbol in a dynamic object.
+ // True if we've seen this symbol in a regular object (bit 23).
+ bool in_reg_ : 1;
+ // True if we've seen this symbol in a dynamic object (bit 24).
bool in_dyn_ : 1;
- // True if the symbol has an entry in the GOT section.
- bool has_got_offset_ : 1;
- // True if there is a warning for this symbol.
+ // True if this is a dynamic symbol which needs a special value in
+ // the dynamic symbol table (bit 25).
+ bool needs_dynsym_value_ : 1;
+ // True if there is a warning for this symbol (bit 26).
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 (bit 27).
+ bool is_copied_from_dynobj_ : 1;
+ // True if this symbol was forced to local visibility by a version
+ // script (bit 28).
+ 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 29).
+ bool is_ordinary_shndx_ : 1;
+ // True if we've seen this symbol in a real ELF object (bit 30).
+ bool in_real_elf_ : 1;
+ // True if this symbol is defined in a section which was discarded
+ // (bit 31).
+ bool is_defined_in_discarded_section_ : 1;
+ // True if UNDEF_BINDING_WEAK_ has been set (bit 32).
+ bool undef_binding_set_ : 1;
+ // True if this symbol was a weak undef resolved by a dynamic def
+ // (bit 33).
+ bool undef_binding_weak_ : 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);
+ 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
+ override_with_special(const Sized_symbol<size>*);
// Return the symbol's value.
Value_type
set_value(Value_type value)
{ this->value_ = value; }
+ // Allocate a common symbol by giving it a location in the output
+ // file.
+ void
+ allocate_common(Output_data*, Value_type value);
+
private:
Sized_symbol(const Sized_symbol&);
Sized_symbol& operator=(const Sized_symbol&);
: warnings_()
{ }
- // Add a warning for symbol NAME in section SHNDX in object OBJ.
+ // Add a warning for symbol NAME in object OBJ. WARNING is the text
+ // of the warning.
void
add_warning(Symbol_table* symtab, const char* name, Object* obj,
- unsigned int shndx);
+ const std::string& warning);
// For each symbol for which we should give a warning, make a note
// on the symbol.
void
note_warnings(Symbol_table* symtab);
- // Issue a warning for a reference to SYM at LOCATION.
+ // Issue a warning for a reference to SYM at RELINFO's location.
+ template<int size, bool big_endian>
void
- issue_warning(const Symbol* sym, const std::string& location) const;
+ issue_warning(const Symbol* sym, const Relocate_info<size, big_endian>*,
+ size_t relnum, off_t reloffset) const;
private:
Warnings(const Warnings&);
{
// The object the warning is in.
Object* object;
- // The index of the warning section.
- unsigned int shndx;
- // The warning text if we have already loaded it.
+ // The warning text.
std::string text;
Warning_location()
- : object(NULL), shndx(0), text()
+ : object(NULL), text()
{ }
void
- set(Object* o, unsigned int s)
+ set(Object* o, const std::string& t)
{
this->object = o;
- this->shndx = s;
+ this->text = t;
}
-
- void
- set_text(const char* t, off_t l)
- { this->text.assign(t, l); }
};
// A mapping from warning symbol names (canonicalized in
- // Symbol_table's namepool_ field) to
+ // Symbol_table's namepool_ field) to warning information.
typedef Unordered_map<const char*, Warning_location> Warning_table;
Warning_table warnings_;
class Symbol_table
{
public:
- Symbol_table();
+ // 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(unsigned int count, const Version_script_info& version_script);
~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(Layout*);
+
+ // 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,
- Symbol** sympointers);
+ 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*>*);
-
- // Define a special symbol.
- template<int size, bool big_endian>
- Sized_symbol<size>*
- define_special_symbol(Target* target, const char* name, bool only_if_ref
- ACCEPT_SIZE_ENDIAN);
+ 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.
- void
- define_in_output_data(Target*, const char* name, Output_data*,
- uint64_t value, uint64_t symsize,
+ Symbol*
+ 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,
bool offset_is_from_end, bool only_if_ref);
// Define a special symbol based on an Output_segment. It is a
// multiple definition error if this symbol is already defined.
- void
- define_in_output_segment(Target*, const char* name, Output_segment*,
- uint64_t value, uint64_t symsize,
+ Symbol*
+ 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,
Symbol::Segment_offset_base, bool only_if_ref);
// 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, Defined,
+ uint64_t value, uint64_t symsize, elfcpp::STT type,
+ elfcpp::STB binding, elfcpp::STV visibility,
+ unsigned char nonvis, bool only_if_ref,
+ bool force_override);
+
+ // Define a set of symbols in output sections. If ONLY_IF_REF is
+ // true, only define them if they are referenced.
void
- define_as_constant(Target*, const char* name, uint64_t value,
- uint64_t symsize, elfcpp::STT type, elfcpp::STB binding,
- elfcpp::STV visibility, unsigned char nonvis,
- bool only_if_ref);
+ define_symbols(const Layout*, int count, const Define_symbol_in_section*,
+ bool only_if_ref);
- // Define a set of symbols in output sections.
+ // Define a set of symbols in output segments. If ONLY_IF_REF is
+ // true, only defined them if they are referenced.
void
- define_symbols(const Layout*, Target*, int count,
- const Define_symbol_in_section*);
+ define_symbols(const Layout*, int count, const Define_symbol_in_segment*,
+ bool only_if_ref);
- // Define a set of symbols in output segments.
+ // Define SYM using a COPY reloc. POSD is the Output_data where the
+ // symbol should be defined--typically a .dyn.bss section. VALUE is
+ // the offset within POSD.
+ template<int size>
void
- define_symbols(const Layout*, Target*, int count,
- const Define_symbol_in_segment*);
+ define_with_copy_reloc(Sized_symbol<size>* sym, Output_data* posd,
+ typename elfcpp::Elf_types<size>::Elf_Addr);
// Look up a symbol.
Symbol*
Symbol*
resolve_forwards(const Symbol* from) const;
- // Return the size of the symbols in the table.
- int
- get_size() const
- { return this->size_; }
-
// 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
+ size_t
saw_undefined() const
{ return this->saw_undefined_; }
// Allocate the common symbols
void
- allocate_commons(const General_options&, Layout*);
+ allocate_commons(Layout*, Mapfile*);
- // Add a warning for symbol NAME in section SHNDX in object OBJ.
+ // Add a warning for symbol NAME in object OBJ. WARNING is the text
+ // of the warning.
void
- add_warning(const char* name, Object* obj, unsigned int shndx)
- { this->warnings_.add_warning(this, name, obj, shndx); }
+ add_warning(const char* name, Object* obj, const std::string& warning)
+ { this->warnings_.add_warning(this, name, obj, warning); }
// Canonicalize a symbol name for use in the hash table.
const char*
canonicalize_name(const char* name)
- { return this->namepool_.add(name, NULL); }
+ { return this->namepool_.add(name, true, NULL); }
// Possibly issue a warning for a reference to SYM at LOCATION which
// is in OBJ.
+ template<int size, bool big_endian>
+ void
+ issue_warning(const Symbol* sym,
+ const Relocate_info<size, big_endian>* relinfo,
+ size_t relnum, off_t reloffset) const
+ { this->warnings_.issue_warning(sym, relinfo, relnum, reloffset); }
+
+ // Check candidate_odr_violations_ to find symbols with the same name
+ // but apparently different definitions (different source-file/line-no).
+ 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
- issue_warning(const Symbol* sym, const std::string& location) const
- { this->warnings_.issue_warning(sym, location); }
+ add_undefined_symbols_from_command_line(Layout*);
+
+ // SYM is defined using a COPY reloc. Return the dynamic object
+ // where the original definition was found.
+ Dynobj*
+ get_copy_source(const Symbol* sym) const;
+
+ // Set the dynamic symbol indexes. INDEX is the index of the first
+ // global dynamic symbol. Pointers to the symbols are stored into
+ // the vector. The names are stored into the Stringpool. This
+ // returns an updated dynamic symbol index.
+ unsigned int
+ set_dynsym_indexes(unsigned int index, std::vector<Symbol*>*,
+ Stringpool*, Versions*);
// Finalize the symbol table after we have set the final addresses
// of all the input sections. This sets the final symbol indexes,
- // values and adds the names to *POOL. INDEX is the index of the
- // first global symbol. This records the file offset OFF, and
- // returns the new file offset.
+ // values and adds the names to *POOL. *PLOCAL_SYMCOUNT is the
+ // index of the first global symbol. OFF is the file offset of the
+ // global symbol table, DYNOFF is the offset of the globals in the
+ // dynamic symbol table, DYN_GLOBAL_INDEX is the index of the first
+ // global dynamic symbol, and DYNCOUNT is the number of global
+ // dynamic symbols. This records the parameters, and returns the
+ // new file offset. It updates *PLOCAL_SYMCOUNT if it created any
+ // local symbols.
off_t
- finalize(unsigned int index, off_t off, Stringpool* pool);
+ 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 Target*, const Stringpool*, Output_file*) const;
+ 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_symtab_xindex*,
+ Output_file*, off_t) const;
+
+ // Dump statistical information to stderr.
+ void
+ print_stats() const;
+
+ // Return the version script information.
+ const Version_script_info&
+ version_script() const
+ { return version_script_; }
private:
Symbol_table(const Symbol_table&);
Symbol_table& operator=(const Symbol_table&);
- // Set the size of the symbols in the table.
- void
- set_size(int size)
- { this->size_ = size; }
+ // 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
// Add a symbol.
template<int size, bool big_endian>
- Symbol*
+ Sized_symbol<size>*
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);
+ bool def, const elfcpp::Sym<size, big_endian>& 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>
- static void
+ void
resolve(Sized_symbol<size>* to,
const elfcpp::Sym<size, big_endian>& sym,
- Object*);
+ 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);
+
+ // 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, Defined, Object*, bool*, bool*);
+
+ // Report a problem in symbol resolution.
static void
- resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from
- ACCEPT_SIZE_ENDIAN);
+ report_resolve_problem(bool is_error, const char* msg, const Symbol* to,
+ Defined, Object* object);
- // Define a symbol in an Output_data, sized version.
+ // 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*, Defined);
+
+ // Override a symbol with a special symbol.
+ template<int size>
+ void
+ override_with_special(Sized_symbol<size>* tosym,
+ const Sized_symbol<size>* fromsym);
+
+ // Record all weak alias sets for a dynamic object.
template<int size>
void
- do_define_in_output_data(Target*, const char* name, Output_data*,
+ record_weak_aliases(std::vector<Sized_symbol<size>*>*);
+
+ // Define a special symbol.
+ 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* 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, 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,
// Define a symbol in an Output_segment, sized version.
template<int size>
- void
+ Sized_symbol<size>*
do_define_in_output_segment(
- Target*, const char* name, 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,
// Define a symbol as a constant, sized version.
template<int size>
- void
+ Sized_symbol<size>*
do_define_as_constant(
- Target*, const char* name,
+ 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 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(Layout*);
+
+ // Add one undefined symbol.
+ template<int size>
+ void
+ add_undefined_symbol_from_command_line(const char* name);
+
+ // 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>
+ void
+ sized_detect_odr_violations() const;
// Finalize symbols specialized for size.
template<int size>
off_t
- sized_finalize(unsigned int, off_t, Stringpool*);
+ sized_finalize(off_t, Stringpool*, unsigned int*);
+
+ // Finalize a symbol. Return whether it should be added to the
+ // symbol table.
+ template<int size>
+ bool
+ sized_finalize_symbol(Symbol*);
+
+ // Add a symbol the final symtab by setting its index.
+ template<int size>
+ void
+ add_to_final_symtab(Symbol*, Stringpool*, unsigned int* pindex, off_t* poff);
// Write globals specialized for size and endianness.
template<int size, bool big_endian>
void
- sized_write_globals(const Target*, const Stringpool*, Output_file*) const;
+ sized_write_globals(const Stringpool*, const Stringpool*,
+ Output_symtab_xindex*, Output_symtab_xindex*,
+ Output_file*) const;
- // The type of the symbol hash table.
+ // Write out a symbol to P.
+ template<int size, bool big_endian>
+ void
+ sized_write_symbol(Sized_symbol<size>*,
+ typename elfcpp::Elf_types<size>::Elf_Addr value,
+ unsigned int shndx, elfcpp::STB,
+ const Stringpool*, unsigned char* p) const;
- typedef std::pair<Stringpool::Key, Stringpool::Key> Symbol_table_key;
+ // Possibly warn about an undefined symbol from a dynamic object.
+ void
+ warn_about_undefined_dynobj_symbol(Symbol*) const;
- struct Symbol_table_hash
+ // 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_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;
+
+ // A map from symbols with COPY relocs to the dynamic objects where
+ // they are defined.
+ typedef Unordered_map<const Symbol*, Dynobj*> Copied_symbol_dynobjs;
+
+ // A map from symbol name (as a pointer into the namepool) to all
+ // the locations the symbols is (weakly) defined (and certain other
+ // conditions are met). This map will be used later to detect
+ // possible One Definition Rule (ODR) violations.
+ struct Symbol_location
{
- size_t
- operator()(const Symbol_table_key&) const;
+ Object* object; // Object where the symbol is defined.
+ unsigned int shndx; // Section-in-object where the symbol is defined.
+ off_t offset; // Offset-in-section where the symbol is defined.
+ bool operator==(const Symbol_location& that) const
+ {
+ return (this->object == that.object
+ && this->shndx == that.shndx
+ && this->offset == that.offset);
+ }
};
- struct Symbol_table_eq
+ struct Symbol_location_hash
{
- bool
- operator()(const Symbol_table_key&, const Symbol_table_key&) const;
+ size_t operator()(const Symbol_location& loc) const
+ { return reinterpret_cast<uintptr_t>(loc.object) ^ loc.offset ^ loc.shndx; }
};
- 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 size of the symbols in the symbol table (32 or 64).
- int size_;
+ typedef Unordered_map<const char*,
+ Unordered_set<Symbol_location, Symbol_location_hash> >
+ Odr_map;
// We increment this every time we see a new undefined symbol, for
// use in archive groups.
- int saw_undefined_;
-
+ size_t saw_undefined_;
// The index of the first global symbol in the output file.
unsigned int first_global_index_;
-
// The file offset within the output symtab section where we should
// write the table.
off_t offset_;
-
// The number of global symbols we want to write out.
- size_t output_count_;
-
+ unsigned int output_count_;
+ // The file offset of the global dynamic symbols, or 0 if none.
+ off_t dynamic_offset_;
+ // The index of the first global dynamic symbol.
+ unsigned int first_dynamic_global_index_;
+ // The number of global dynamic symbols, or 0 if none.
+ unsigned int dynamic_count_;
// The symbol hash table.
Symbol_table_type table_;
-
// A pool of symbol names. This is used for all global symbols.
// Entries in the hash table point into this pool.
Stringpool namepool_;
-
// Forwarding symbols.
Unordered_map<const Symbol*, Symbol*> forwarders_;
-
+ // Weak aliases. A symbol in this list points to the next alias.
+ // The aliases point to each other in a circular list.
+ Unordered_map<Symbol*, Symbol*> weak_aliases_;
// We don't expect there to be very many common symbols, so we keep
// a list of them. When we find a common symbol we add it to this
// list. It is possible that by the time we process the list the
// 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.
+ Forced_locals forced_locals_;
// Manage symbol warnings.
Warnings warnings_;
+ // Manage potential One Definition Rule (ODR) violations.
+ Odr_map candidate_odr_violations_;
+
+ // When we emit a COPY reloc for a symbol, we define it in an
+ // Output_data. When it's time to emit version information for it,
+ // we need to know the dynamic object in which we found the original
+ // definition. This maps symbols with COPY relocs to the dynamic
+ // object where they were defined.
+ 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.
template<int size>
Sized_symbol<size>*
-Symbol_table::get_sized_symbol(Symbol* sym ACCEPT_SIZE) const
+Symbol_table::get_sized_symbol(Symbol* sym) const
{
- assert(size == this->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
{
- assert(size == this->get_size());
+ gold_assert(size == parameters->target().get_size());
return static_cast<const Sized_symbol<size>*>(sym);
}
projects / deliverable / binutils-gdb.git / blobdiff