// object.h -- support for an object file for linking in gold -*- C++ -*-
+// Copyright 2006, 2007 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.
+
#ifndef GOLD_OBJECT_H
#define GOLD_OBJECT_H
{
class General_options;
-class Stringpool;
+class Task;
class Layout;
class Output_section;
class Output_file;
class Dynobj;
+class Object_merge_map;
+
+template<typename Stringpool_char>
+class Stringpool_template;
// Data to pass from read_symbols() to add_symbols().
// Section names.
File_view* section_names;
// Size of section name data in bytes.
- off_t section_names_size;
+ section_size_type section_names_size;
// Symbol data.
File_view* symbols;
// Size of symbol data in bytes.
- off_t symbols_size;
+ section_size_type symbols_size;
+ // Offset of external symbols within symbol data. This structure
+ // sometimes contains only external symbols, in which case this will
+ // be zero. Sometimes it contains all symbols.
+ section_offset_type external_symbols_offset;
// Symbol names.
File_view* symbol_names;
// Size of symbol name data in bytes.
- off_t symbol_names_size;
+ section_size_type symbol_names_size;
// Version information. This is only used on dynamic objects.
// Version symbol data (from SHT_GNU_versym section).
File_view* versym;
- off_t versym_size;
+ section_size_type versym_size;
// Version definition data (from SHT_GNU_verdef section).
File_view* verdef;
- off_t verdef_size;
+ section_size_type verdef_size;
unsigned int verdef_info;
// Needed version data (from SHT_GNU_verneed section).
File_view* verneed;
- off_t verneed_size;
+ section_size_type verneed_size;
unsigned int verneed_info;
};
+// Information used to print error messages.
+
+struct Symbol_location_info
+{
+ std::string source_file;
+ std::string enclosing_symbol_name;
+ int line_number;
+};
+
// Data about a single relocation section. This is read in
// read_relocs and processed in scan_relocs.
unsigned int sh_type;
// Number of reloc entries.
size_t reloc_count;
+ // Output section.
+ Output_section* output_section;
+ // Whether this section has special handling for offsets.
+ bool needs_special_offset_handling;
};
// Relocations in an object file. This is read in read_relocs and
name() const
{ return this->name_; }
+ // Get the offset into the file.
+ off_t
+ offset() const
+ { return this->offset_; }
+
// Return whether this is a dynamic object.
bool
is_dynamic() const
// Lock the underlying file.
void
- lock()
- { this->input_file_->file().lock(); }
+ lock(const Task* t)
+ { this->input_file()->file().lock(t); }
// Unlock the underlying file.
void
- unlock()
- { this->input_file_->file().unlock(); }
+ unlock(const Task* t)
+ { this->input_file()->file().unlock(t); }
// Return whether the underlying file is locked.
bool
is_locked() const
- { return this->input_file_->file().is_locked(); }
+ { return this->input_file()->file().is_locked(); }
+
+ // Return the token, so that the task can be queued.
+ Task_token*
+ token()
+ { return this->input_file()->file().token(); }
+
+ // Release the underlying file.
+ void
+ release()
+ { this->input_file_->file().release(); }
// Return the sized target structure associated with this object.
// This is like the target method but it returns a pointer of
// appropriate checked type.
template<int size, bool big_endian>
Sized_target<size, big_endian>*
- sized_target(ACCEPT_SIZE_ENDIAN_ONLY);
+ sized_target(ACCEPT_SIZE_ENDIAN_ONLY) const;
- // Read the symbol information.
- void
- read_symbols(Read_symbols_data* sd)
- { return this->do_read_symbols(sd); }
-
- // Pass sections which should be included in the link to the Layout
- // object, and record where the sections go in the output file.
- void
- layout(const General_options& options, Symbol_table* symtab,
- Layout* layout, Read_symbols_data* sd)
- { this->do_layout(options, symtab, layout, sd); }
-
- // Add symbol information to the global symbol table.
- void
- add_symbols(Symbol_table* symtab, Read_symbols_data* sd)
- { this->do_add_symbols(symtab, sd); }
+ // Get the number of sections.
+ unsigned int
+ shnum() const
+ { return this->shnum_; }
// Return a view of the contents of a section. Set *PLEN to the
- // size.
+ // size. CACHE is a hint as in File_read::get_view.
const unsigned char*
- section_contents(unsigned int shndx, off_t* plen);
+ section_contents(unsigned int shndx, section_size_type* plen, bool cache);
// Return the name of a section given a section index. This is only
// used for error messages.
section_flags(unsigned int shndx)
{ return this->do_section_flags(shndx); }
+ // Return the section type given a section index.
+ unsigned int
+ section_type(unsigned int shndx)
+ { return this->do_section_type(shndx); }
+
+ // Return the section link field given a section index.
+ unsigned int
+ section_link(unsigned int shndx)
+ { return this->do_section_link(shndx); }
+
+ // Return the section info field given a section index.
+ unsigned int
+ section_info(unsigned int shndx)
+ { return this->do_section_info(shndx); }
+
+ // Read the symbol information.
+ void
+ read_symbols(Read_symbols_data* sd)
+ { return this->do_read_symbols(sd); }
+
+ // Pass sections which should be included in the link to the Layout
+ // object, and record where the sections go in the output file.
+ void
+ layout(Symbol_table* symtab, Layout* layout, Read_symbols_data* sd)
+ { this->do_layout(symtab, layout, sd); }
+
+ // Add symbol information to the global symbol table.
+ void
+ add_symbols(Symbol_table* symtab, Read_symbols_data* sd)
+ { this->do_add_symbols(symtab, sd); }
+
// Functions and types for the elfcpp::Elf_file interface. This
// permit us to use Object as the File template parameter for
// elfcpp::Elf_file.
// Return a View.
View
- view(off_t file_offset, off_t data_size)
- { return View(this->get_view(file_offset, data_size)); }
+ view(off_t file_offset, section_size_type data_size)
+ { return View(this->get_view(file_offset, data_size, true)); }
// Report an error.
void
- error(const char* format, ...) ATTRIBUTE_PRINTF_2;
+ error(const char* format, ...) const ATTRIBUTE_PRINTF_2;
// A location in the file.
struct Location
off_t file_offset;
off_t data_size;
- Location(off_t fo, off_t ds)
+ Location(off_t fo, section_size_type ds)
: file_offset(fo), data_size(ds)
{ }
};
// Get a View given a Location.
View view(Location loc)
- { return View(this->get_view(loc.file_offset, loc.data_size)); }
+ { return View(this->get_view(loc.file_offset, loc.data_size, true)); }
protected:
// Read the symbols--implemented by child class.
// Lay out sections--implemented by child class.
virtual void
- do_layout(const General_options&, Symbol_table*, Layout*,
- Read_symbols_data*) = 0;
+ do_layout(Symbol_table*, Layout*, Read_symbols_data*) = 0;
// Add symbol information to the global symbol table--implemented by
// child class.
virtual uint64_t
do_section_flags(unsigned int shndx) = 0;
- // Get the file.
+ // Get section type--implemented by child class.
+ virtual unsigned int
+ do_section_type(unsigned int shndx) = 0;
+
+ // Get section link field--implemented by child class.
+ virtual unsigned int
+ do_section_link(unsigned int shndx) = 0;
+
+ // Get section info field--implemented by child class.
+ virtual unsigned int
+ do_section_info(unsigned int shndx) = 0;
+
+ // Get the file. We pass on const-ness.
Input_file*
- input_file() const
+ input_file()
{ return this->input_file_; }
- // Get the offset into the file.
- off_t
- offset() const
- { return this->offset_; }
+ const Input_file*
+ input_file() const
+ { return this->input_file_; }
// Get a view into the underlying file.
const unsigned char*
- get_view(off_t start, off_t size)
- { return this->input_file_->file().get_view(start + this->offset_, size); }
+ get_view(off_t start, section_size_type size, bool cache)
+ {
+ return this->input_file()->file().get_view(start + this->offset_, size,
+ cache);
+ }
// Get a lasting view into the underlying file.
File_view*
- get_lasting_view(off_t start, off_t size)
+ get_lasting_view(off_t start, section_size_type size, bool cache)
{
- return this->input_file_->file().get_lasting_view(start + this->offset_,
- size);
+ return this->input_file()->file().get_lasting_view(start + this->offset_,
+ size, cache);
}
// Read data from the underlying file.
void
- read(off_t start, off_t size, void* p)
- { this->input_file_->file().read(start + this->offset_, size, p); }
+ read(off_t start, section_size_type size, void* p) const
+ { this->input_file()->file().read(start + this->offset_, size, p); }
// Set the target.
void
set_target(int machine, int size, bool big_endian, int osabi,
int abiversion);
- // Get the number of sections.
- unsigned int
- shnum() const
- { return this->shnum_; }
-
// Set the number of sections.
void
set_shnum(int shnum)
template<int size, bool big_endian>
inline Sized_target<size, big_endian>*
-Object::sized_target(ACCEPT_SIZE_ENDIAN_ONLY)
+Object::sized_target(ACCEPT_SIZE_ENDIAN_ONLY) const
{
gold_assert(this->target_->get_size() == size);
gold_assert(this->target_->is_big_endian() ? big_endian : !big_endian);
}
// A regular object (ET_REL). This is an abstract base class itself.
-// The implementations is the template class Sized_relobj.
+// The implementation is the template class Sized_relobj.
class Relobj : public Object
{
public:
Relobj(const std::string& name, Input_file* input_file, off_t offset = 0)
- : Object(name, input_file, false, offset)
+ : Object(name, input_file, false, offset),
+ map_to_output_(),
+ object_merge_map_(NULL),
+ relocs_must_follow_section_writes_(false)
{ }
// Read the relocs.
Layout* layout, Read_relocs_data* rd)
{ return this->do_scan_relocs(options, symtab, layout, rd); }
- // Initial local symbol processing: set the offset where local
- // symbol information will be stored; add local symbol names to
- // *POOL; return the new local symbol index.
+ // The number of local symbols in the input symbol table.
+ virtual unsigned int
+ local_symbol_count() const
+ { return this->do_local_symbol_count(); }
+
+ // Initial local symbol processing: count the number of local symbols
+ // in the output symbol table and dynamic symbol table; add local symbol
+ // names to *POOL and *DYNPOOL.
+ void
+ count_local_symbols(Stringpool_template<char>* pool,
+ Stringpool_template<char>* dynpool)
+ { return this->do_count_local_symbols(pool, dynpool); }
+
+ // Set the values of the local symbols, set the output symbol table
+ // indexes for the local variables, and set the offset where local
+ // symbol information will be stored. Returns the new local symbol index.
+ unsigned int
+ finalize_local_symbols(unsigned int index, off_t off)
+ { return this->do_finalize_local_symbols(index, off); }
+
+ // Set the output dynamic symbol table indexes for the local variables.
+ unsigned int
+ set_local_dynsym_indexes(unsigned int index)
+ { return this->do_set_local_dynsym_indexes(index); }
+
+ // Set the offset where local dynamic symbol information will be stored.
unsigned int
- finalize_local_symbols(unsigned int index, off_t off, Stringpool* pool)
- { return this->do_finalize_local_symbols(index, off, pool); }
+ set_local_dynsym_offset(off_t off)
+ { return this->do_set_local_dynsym_offset(off); }
// Relocate the input sections and write out the local symbols.
void
// Return whether an input section is being included in the link.
bool
- is_section_included(unsigned int shnum) const
+ is_section_included(unsigned int shndx) const
{
- gold_assert(shnum < this->map_to_output_.size());
- return this->map_to_output_[shnum].output_section != NULL;
+ gold_assert(shndx < this->map_to_output_.size());
+ return this->map_to_output_[shndx].output_section != NULL;
+ }
+
+ // Return whether an input section requires special
+ // handling--whether it is not simply mapped from the input file to
+ // the output file.
+ bool
+ is_section_specially_mapped(unsigned int shndx) const
+ {
+ gold_assert(shndx < this->map_to_output_.size());
+ return (this->map_to_output_[shndx].output_section != NULL
+ && this->map_to_output_[shndx].offset == -1);
}
// Given a section index, return the corresponding Output_section
// (which will be NULL if the section is not included in the link)
- // and set *POFF to the offset within that section.
+ // and set *POFF to the offset within that section. *POFF will be
+ // set to -1 if the section requires special handling.
inline Output_section*
- output_section(unsigned int shnum, off_t* poff);
+ output_section(unsigned int shndx, section_offset_type* poff) const;
// Set the offset of an input section within its output section.
void
- set_section_offset(unsigned int shndx, off_t off)
+ set_section_offset(unsigned int shndx, section_offset_type off)
{
gold_assert(shndx < this->map_to_output_.size());
this->map_to_output_[shndx].offset = off;
}
+ // Return true if we need to wait for output sections to be written
+ // before we can apply relocations. This is true if the object has
+ // any relocations for sections which require special handling, such
+ // as the exception frame section.
+ bool
+ relocs_must_follow_section_writes() const
+ { return this->relocs_must_follow_section_writes_; }
+
+ // Return the object merge map.
+ Object_merge_map*
+ merge_map() const
+ { return this->object_merge_map_; }
+
+ // Set the object merge map.
+ void
+ set_merge_map(Object_merge_map* object_merge_map)
+ {
+ gold_assert(this->object_merge_map_ == NULL);
+ this->object_merge_map_ = object_merge_map;
+ }
+
protected:
// What we need to know to map an input section to an output
// section. We keep an array of these, one for each input section,
// The output section. This is NULL if the input section is to be
// discarded.
Output_section* output_section;
- // The offset within the output section.
- off_t offset;
+ // The offset within the output section. This is -1 if the
+ // section requires special handling.
+ section_offset_type offset;
};
// Read the relocs--implemented by child class.
do_scan_relocs(const General_options&, Symbol_table*, Layout*,
Read_relocs_data*) = 0;
- // Finalize local symbols--implemented by child class.
+ // Return the number of local symbols--implemented by child class.
+ virtual unsigned int
+ do_local_symbol_count() const = 0;
+
+ // Count local symbols--implemented by child class.
+ virtual void
+ do_count_local_symbols(Stringpool_template<char>*,
+ Stringpool_template<char>*) = 0;
+
+ // Finalize the local symbols. Set the output symbol table indexes for the local variables, and set the
+ // offset where local symbol information will be stored.
+ virtual unsigned int
+ do_finalize_local_symbols(unsigned int, off_t) = 0;
+
+ // Set the output dynamic symbol table indexes for the local variables.
+ virtual unsigned int
+ do_set_local_dynsym_indexes(unsigned int) = 0;
+
+ // Set the offset where local dynamic symbol information will be stored.
virtual unsigned int
- do_finalize_local_symbols(unsigned int, off_t, Stringpool*) = 0;
+ do_set_local_dynsym_offset(off_t) = 0;
// Relocate the input sections and write out the local
// symbols--implemented by child class.
map_to_output()
{ return this->map_to_output_; }
+ const std::vector<Map_to_output>&
+ map_to_output() const
+ { return this->map_to_output_; }
+
+ // Record that we must wait for the output sections to be written
+ // before applying relocations.
+ void
+ set_relocs_must_follow_section_writes()
+ { this->relocs_must_follow_section_writes_ = true; }
+
private:
// Mapping from input sections to output section.
std::vector<Map_to_output> map_to_output_;
+ // Mappings for merge sections. This is managed by the code in the
+ // Merge_map class.
+ Object_merge_map* object_merge_map_;
+ // Whether we need to wait for output sections to be written before
+ // we can apply relocations.
+ bool relocs_must_follow_section_writes_;
};
// Implement Object::output_section inline for efficiency.
inline Output_section*
-Relobj::output_section(unsigned int shnum, off_t* poff)
+Relobj::output_section(unsigned int shndx, section_offset_type* poff) const
{
- gold_assert(shnum < this->map_to_output_.size());
- const Map_to_output& mo(this->map_to_output_[shnum]);
+ gold_assert(shndx < this->map_to_output_.size());
+ const Map_to_output& mo(this->map_to_output_[shndx]);
*poff = mo.offset;
return mo.output_section;
}
+// This POD class is holds the value of a symbol. This is used for
+// local symbols, and for all symbols during relocation processing.
+// For special sections, such as SHF_MERGE sections, this calls a
+// function to get the final symbol value.
+
+template<int size>
+class Symbol_value
+{
+ public:
+ typedef typename elfcpp::Elf_types<size>::Elf_Addr Value;
+
+ Symbol_value()
+ : output_symtab_index_(0), output_dynsym_index_(-1U), input_shndx_(0),
+ is_section_symbol_(false), is_tls_symbol_(false),
+ needs_output_address_(false), value_(0)
+ { }
+
+ // Get the value of this symbol. OBJECT is the object in which this
+ // symbol is defined, and ADDEND is an addend to add to the value.
+ template<bool big_endian>
+ Value
+ value(const Sized_relobj<size, big_endian>* object, Value addend) const
+ {
+ if (!this->needs_output_address_)
+ return this->value_ + addend;
+ return object->local_value(this->input_shndx_, this->value_,
+ this->is_section_symbol_, addend);
+ }
+
+ // Set the value of this symbol in the output symbol table.
+ void
+ set_output_value(Value value)
+ {
+ this->value_ = value;
+ this->needs_output_address_ = false;
+ }
+
+ // Set the value of the symbol from the input file. This value
+ // will usually be replaced during finalization with the output
+ // value, but if the symbol is mapped to an output section which
+ // requires special handling to determine the output value, we
+ // leave the input value in place until later. This is used for
+ // SHF_MERGE sections.
+ void
+ set_input_value(Value value)
+ {
+ this->value_ = value;
+ this->needs_output_address_ = true;
+ }
+
+ // Return the input value.
+ Value
+ input_value() const
+ {
+ gold_assert(this->needs_output_address_);
+ return this->value_;
+ }
+
+ // Return whether this symbol should go into the output symbol
+ // table.
+ bool
+ needs_output_symtab_entry() const
+ { return this->output_symtab_index_ != -1U; }
+
+ // Return the index in the output symbol table.
+ unsigned int
+ output_symtab_index() const
+ {
+ gold_assert(this->output_symtab_index_ != 0);
+ return this->output_symtab_index_;
+ }
+
+ // Set the index in the output symbol table.
+ void
+ set_output_symtab_index(unsigned int i)
+ {
+ gold_assert(this->output_symtab_index_ == 0);
+ this->output_symtab_index_ = i;
+ }
+
+ // Record that this symbol should not go into the output symbol
+ // table.
+ void
+ set_no_output_symtab_entry()
+ {
+ gold_assert(this->output_symtab_index_ == 0);
+ this->output_symtab_index_ = -1U;
+ }
+
+ // Set the index in the output dynamic symbol table.
+ void
+ set_needs_output_dynsym_entry()
+ {
+ this->output_dynsym_index_ = 0;
+ }
+
+ // Return whether this symbol should go into the output symbol
+ // table.
+ bool
+ needs_output_dynsym_entry() const
+ {
+ return this->output_dynsym_index_ != -1U;
+ }
+
+ // Record that this symbol should go into the dynamic symbol table.
+ void
+ set_output_dynsym_index(unsigned int i)
+ {
+ gold_assert(this->output_dynsym_index_ == 0);
+ this->output_dynsym_index_ = i;
+ }
+
+ // Return the index in the output dynamic symbol table.
+ unsigned int
+ output_dynsym_index() const
+ {
+ gold_assert(this->output_dynsym_index_ != 0);
+ return this->output_dynsym_index_;
+ }
+
+ // Set the index of the input section in the input file.
+ void
+ set_input_shndx(unsigned int i)
+ {
+ this->input_shndx_ = i;
+ // input_shndx_ field is a bitfield, so make sure that the value
+ // fits.
+ gold_assert(this->input_shndx_ == i);
+ }
+
+ // Return the index of the input section in the input file.
+ unsigned int
+ input_shndx() const
+ { return this->input_shndx_; }
+
+ // Record that this is a section symbol.
+ void
+ set_is_section_symbol()
+ { this->is_section_symbol_ = true; }
+
+ // Record that this is a TLS symbol.
+ void
+ set_is_tls_symbol()
+ { this->is_tls_symbol_ = true; }
+
+ // Return TRUE if this is a TLS symbol.
+ bool
+ is_tls_symbol() const
+ { return this->is_tls_symbol_; }
+
+ private:
+ // The index of this local symbol in the output symbol table. This
+ // will be -1 if the symbol should not go into the symbol table.
+ unsigned int output_symtab_index_;
+ // The index of this local symbol in the dynamic symbol table. This
+ // will be -1 if the symbol should not go into the symbol table.
+ unsigned int output_dynsym_index_;
+ // The section index in the input file in which this symbol is
+ // defined.
+ unsigned int input_shndx_ : 29;
+ // Whether this is a STT_SECTION symbol.
+ bool is_section_symbol_ : 1;
+ // Whether this is a STT_TLS symbol.
+ bool is_tls_symbol_ : 1;
+ // Whether getting the value of this symbol requires calling an
+ // Output_section method. For example, this will be true of a
+ // symbol in a SHF_MERGE section.
+ bool needs_output_address_ : 1;
+ // The value of the symbol. If !needs_output_address_, this is the
+ // value in the output file. If needs_output_address_, this is the
+ // value in the input file.
+ Value value_;
+};
+
// A regular object file. This is size and endian specific.
template<int size, bool big_endian>
{
public:
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
- typedef std::vector<Address> Local_values;
+ typedef std::vector<Symbol*> Symbols;
+ typedef std::vector<Symbol_value<size> > Local_values;
Sized_relobj(const std::string& name, Input_file* input_file, off_t offset,
const typename elfcpp::Ehdr<size, big_endian>&);
void
setup(const typename elfcpp::Ehdr<size, big_endian>&);
+ // If SYM is the index of a global symbol in the object file's
+ // symbol table, return the Symbol object. Otherwise, return NULL.
+ Symbol*
+ global_symbol(unsigned int sym) const
+ {
+ if (sym >= this->local_symbol_count_)
+ {
+ gold_assert(sym - this->local_symbol_count_ < this->symbols_.size());
+ return this->symbols_[sym - this->local_symbol_count_];
+ }
+ return NULL;
+ }
+
+ // Return the section index of symbol SYM. Set *VALUE to its value
+ // in the object file. Note that for a symbol which is not defined
+ // in this object file, this will set *VALUE to 0 and return
+ // SHN_UNDEF; it will not return the final value of the symbol in
+ // the link.
+ unsigned int
+ symbol_section_and_value(unsigned int sym, Address* value);
+
+ // Return a pointer to the Symbol_value structure which holds the
+ // value of a local symbol.
+ const Symbol_value<size>*
+ local_symbol(unsigned int sym) const
+ {
+ gold_assert(sym < this->local_values_.size());
+ return &this->local_values_[sym];
+ }
+
// Return the index of local symbol SYM in the ordinary symbol
// table. A value of -1U means that the symbol is not being output.
unsigned int
symtab_index(unsigned int sym) const
{
- gold_assert(sym < this->local_indexes_.size());
- gold_assert(this->local_indexes_[sym] != 0);
- return this->local_indexes_[sym];
+ gold_assert(sym < this->local_values_.size());
+ return this->local_values_[sym].output_symtab_index();
+ }
+
+ // Return the index of local symbol SYM in the dynamic symbol
+ // table. A value of -1U means that the symbol is not being output.
+ unsigned int
+ dynsym_index(unsigned int sym) const
+ {
+ gold_assert(sym < this->local_values_.size());
+ return this->local_values_[sym].output_dynsym_index();
+ }
+
+ // Return the appropriate Sized_target structure.
+ Sized_target<size, big_endian>*
+ sized_target()
+ {
+ return this->Object::sized_target
+ SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
+ SELECT_SIZE_ENDIAN_ONLY(size, big_endian));
+ }
+
+ // Return the value of the local symbol symndx.
+ Address
+ local_symbol_value(unsigned int symndx) const;
+
+ // Return the value of a local symbol defined in input section
+ // SHNDX, with value VALUE, adding addend ADDEND. IS_SECTION_SYMBOL
+ // indicates whether the symbol is a section symbol. This handles
+ // SHF_MERGE sections.
+ Address
+ local_value(unsigned int shndx, Address value, bool is_section_symbol,
+ Address addend) const;
+
+ void
+ set_needs_output_dynsym_entry(unsigned int sym)
+ {
+ gold_assert(sym < this->local_values_.size());
+ this->local_values_[sym].set_needs_output_dynsym_entry();
}
+ // Return whether the local symbol SYMNDX has a GOT offset.
+ // For TLS symbols, the GOT entry will hold its tp-relative offset.
+ bool
+ local_has_got_offset(unsigned int symndx) const
+ {
+ return (this->local_got_offsets_.find(symndx)
+ != this->local_got_offsets_.end());
+ }
+
+ // Return the GOT offset of the local symbol SYMNDX.
+ unsigned int
+ local_got_offset(unsigned int symndx) const
+ {
+ Local_got_offsets::const_iterator p =
+ this->local_got_offsets_.find(symndx);
+ gold_assert(p != this->local_got_offsets_.end());
+ return p->second;
+ }
+
+ // Set the GOT offset of the local symbol SYMNDX to GOT_OFFSET.
+ void
+ set_local_got_offset(unsigned int symndx, unsigned int got_offset)
+ {
+ std::pair<Local_got_offsets::iterator, bool> ins =
+ this->local_got_offsets_.insert(std::make_pair(symndx, got_offset));
+ gold_assert(ins.second);
+ }
+
+ // Return whether the local TLS symbol SYMNDX has a GOT offset.
+ // The GOT entry at this offset will contain a module index. If
+ // NEED_PAIR is true, a second entry immediately following the first
+ // will contain the dtv-relative offset.
+ bool
+ local_has_tls_got_offset(unsigned int symndx, bool need_pair) const
+ {
+ typename Local_tls_got_offsets::const_iterator p =
+ this->local_tls_got_offsets_.find(symndx);
+ if (p == this->local_tls_got_offsets_.end()
+ || (need_pair && !p->second.have_pair_))
+ return false;
+ return true;
+ }
+
+ // Return the offset of the GOT entry for the local TLS symbol SYMNDX.
+ // If NEED_PAIR is true, we need the offset of a pair of GOT entries;
+ // otherwise we need the offset of the GOT entry for the module index.
+ unsigned int
+ local_tls_got_offset(unsigned int symndx, bool need_pair) const
+ {
+ typename Local_tls_got_offsets::const_iterator p =
+ this->local_tls_got_offsets_.find(symndx);
+ gold_assert(p != this->local_tls_got_offsets_.end());
+ gold_assert(!need_pair || p->second.have_pair_);
+ return p->second.got_offset_;
+ }
+
+ // Set the offset of the GOT entry for the local TLS symbol SYMNDX
+ // to GOT_OFFSET. If HAVE_PAIR is true, we have a pair of GOT entries;
+ // otherwise, we have just a single entry for the module index.
+ void
+ set_local_tls_got_offset(unsigned int symndx, unsigned int got_offset,
+ bool have_pair)
+ {
+ typename Local_tls_got_offsets::iterator p =
+ this->local_tls_got_offsets_.find(symndx);
+ if (p != this->local_tls_got_offsets_.end())
+ {
+ // An entry already existed for this symbol. This can happen
+ // if we see a relocation asking for the module index before
+ // a relocation asking for the pair. In that case, the original
+ // GOT entry will remain, but won't get used by any further
+ // relocations.
+ p->second.got_offset_ = got_offset;
+ gold_assert(have_pair);
+ p->second.have_pair_ = true;
+ }
+ else
+ {
+ std::pair<typename Local_tls_got_offsets::iterator, bool> ins =
+ this->local_tls_got_offsets_.insert(
+ std::make_pair(symndx, Tls_got_entry(got_offset, have_pair)));
+ gold_assert(ins.second);
+ }
+ }
+
+ // Return the name of the symbol that spans the given offset in the
+ // specified section in this object. This is used only for error
+ // messages and is not particularly efficient.
+ bool
+ get_symbol_location_info(unsigned int shndx, off_t offset,
+ Symbol_location_info* info);
+
+ protected:
// Read the symbols.
void
do_read_symbols(Read_symbols_data*);
+ // Return the number of local symbols.
+ unsigned int
+ do_local_symbol_count() const
+ { return this->local_symbol_count_; }
+
// Lay out the input sections.
void
- do_layout(const General_options&, Symbol_table*, Layout*,
- Read_symbols_data*);
+ do_layout(Symbol_table*, Layout*, Read_symbols_data*);
// Add the symbols to the symbol table.
void
do_scan_relocs(const General_options&, Symbol_table*, Layout*,
Read_relocs_data*);
+ // Count the local symbols.
+ void
+ do_count_local_symbols(Stringpool_template<char>*,
+ Stringpool_template<char>*);
+
// Finalize the local symbols.
unsigned int
- do_finalize_local_symbols(unsigned int, off_t, Stringpool*);
+ do_finalize_local_symbols(unsigned int, off_t);
+
+ // Set the offset where local dynamic symbol information will be stored.
+ unsigned int
+ do_set_local_dynsym_indexes(unsigned int);
+
+ // Set the offset where local dynamic symbol information will be stored.
+ unsigned int
+ do_set_local_dynsym_offset(off_t);
// Relocate the input sections and write out the local symbols.
void
do_section_flags(unsigned int shndx)
{ return this->elf_file_.section_flags(shndx); }
- // Return the appropriate Sized_target structure.
- Sized_target<size, big_endian>*
- sized_target()
- {
- return this->Object::sized_target
- SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
- SELECT_SIZE_ENDIAN_ONLY(size, big_endian));
- }
+ // Return section type.
+ unsigned int
+ do_section_type(unsigned int shndx)
+ { return this->elf_file_.section_type(shndx); }
+
+ // Return the section link field.
+ unsigned int
+ do_section_link(unsigned int shndx)
+ { return this->elf_file_.section_link(shndx); }
+
+ // Return the section info field.
+ unsigned int
+ do_section_info(unsigned int shndx)
+ { return this->elf_file_.section_info(shndx); }
private:
// For convenience.
void
find_symtab(const unsigned char* pshdrs);
+ // Return whether SHDR has the right flags for a GNU style exception
+ // frame section.
+ bool
+ check_eh_frame_flags(const elfcpp::Shdr<size, big_endian>* shdr) const;
+
+ // Return whether there is a section named .eh_frame which might be
+ // a GNU style exception frame section.
+ bool
+ find_eh_frame(const unsigned char* pshdrs, const char* names,
+ section_size_type names_size) const;
+
// Whether to include a section group in the link.
bool
include_section_group(Layout*, unsigned int,
unsigned char* view;
typename elfcpp::Elf_types<size>::Elf_Addr address;
off_t offset;
- off_t view_size;
+ section_size_type view_size;
+ bool is_input_output_view;
+ bool is_postprocessing_view;
};
typedef std::vector<View_size> Views;
// Write section data to the output file. Record the views and
// sizes in VIEWS for use when relocating.
void
- write_sections(const unsigned char* pshdrs, Output_file*, Views*);
+ write_sections(const unsigned char* pshdrs, Output_file*, Views*) const;
// Relocate the sections in the output file.
void
// Write out the local symbols.
void
- write_local_symbols(Output_file*, const Stringpool*);
+ write_local_symbols(Output_file*,
+ const Stringpool_template<char>*,
+ const Stringpool_template<char>*);
+
+ // The GOT offsets of local symbols. This map also stores GOT offsets
+ // for tp-relative offsets for TLS symbols.
+ typedef Unordered_map<unsigned int, unsigned int> Local_got_offsets;
+
+ // The TLS GOT offsets of local symbols. The map stores the offsets
+ // for either a single GOT entry that holds the module index of a TLS
+ // symbol, or a pair of GOT entries containing the module index and
+ // dtv-relative offset.
+ struct Tls_got_entry
+ {
+ Tls_got_entry(int got_offset, bool have_pair)
+ : got_offset_(got_offset),
+ have_pair_(have_pair)
+ { }
+ int got_offset_;
+ bool have_pair_;
+ };
+ typedef Unordered_map<unsigned int, Tls_got_entry> Local_tls_got_offsets;
// General access to the ELF file.
elfcpp::Elf_file<size, big_endian, Object> elf_file_;
unsigned int local_symbol_count_;
// The number of local symbols which go into the output file.
unsigned int output_local_symbol_count_;
+ // The number of local symbols which go into the output file's dynamic
+ // symbol table.
+ unsigned int output_local_dynsym_count_;
// The entries in the symbol table for the external symbols.
- Symbol** symbols_;
+ Symbols symbols_;
// File offset for local symbols.
off_t local_symbol_offset_;
+ // File offset for local dynamic symbols.
+ off_t local_dynsym_offset_;
// Values of local symbols.
Local_values local_values_;
- // Indexes of local symbols in the output file; -1U if not present.
- std::vector<unsigned int> local_indexes_;
+ // GOT offsets for local non-TLS symbols, and tp-relative offsets
+ // for TLS symbols, indexed by symbol number.
+ Local_got_offsets local_got_offsets_;
+ // GOT offsets for local TLS symbols, indexed by symbol number
+ // and GOT entry type.
+ Local_tls_got_offsets local_tls_got_offsets_;
+ // Whether this object has a GNU style .eh_frame section.
+ bool has_eh_frame_;
};
// A class to manage the list of all objects.
{
public:
Input_objects()
- : relobj_list_(), target_(NULL)
+ : relobj_list_(), dynobj_list_(), target_(NULL), sonames_(),
+ system_library_directory_()
{ }
// The type of the list of input relocateable objects.
typedef std::vector<Dynobj*> Dynobj_list;
typedef Dynobj_list::const_iterator Dynobj_iterator;
- // Add an object to the list.
- void
+ // Add an object to the list. Return true if all is well, or false
+ // if this object should be ignored.
+ bool
add_object(Object*);
// Get the target we should use for the output file.
target() const
{ return this->target_; }
+ // For each dynamic object, check whether we've seen all of its
+ // explicit dependencies.
+ void
+ check_dynamic_dependencies() const;
+
+ // Return whether an object was found in the system library
+ // directory.
+ bool
+ found_in_system_library_directory(const Object*) const;
+
// Iterate over all regular objects.
Relobj_iterator
any_dynamic() const
{ return !this->dynobj_list_.empty(); }
+ // Return the number of input objects.
+ int
+ number_of_input_objects() const
+ { return this->relobj_list_.size() + this->dynobj_list_.size(); }
+
private:
Input_objects(const Input_objects&);
Input_objects& operator=(const Input_objects&);
+ // The list of ordinary objects included in the link.
Relobj_list relobj_list_;
+ // The list of dynamic objects included in the link.
Dynobj_list dynobj_list_;
+ // The target.
Target* target_;
+ // SONAMEs that we have seen.
+ Unordered_set<std::string> sonames_;
+ // The directory in which we find the libc.so.
+ std::string system_library_directory_;
};
// Some of the information we pass to the relocation routines. We
const Layout* layout;
// Object being relocated.
Sized_relobj<size, big_endian>* object;
- // Number of local symbols.
- unsigned int local_symbol_count;
- // Values of local symbols.
- const typename Sized_relobj<size, big_endian>::Local_values* local_values;
- // Global symbols.
- const Symbol* const * symbols;
// Section index of relocation section.
unsigned int reloc_shndx;
// Section index of section being relocated.
extern Object*
make_elf_object(const std::string& name, Input_file*,
off_t offset, const unsigned char* p,
- off_t bytes);
+ section_offset_type bytes);
} // end namespace gold
projects / binutils-gdb.git / blobdiff