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binutils-gdb/gold/incremental.h

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// inremental.h -- incremental linking support for gold -*- C++ -*-
// Copyright (C) 2009-2014 Free Software Foundation, Inc.
// Written by Mikolaj Zalewski <mikolajz@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_INCREMENTAL_H
#define GOLD_INCREMENTAL_H
#include <map>
#include <vector>
#include "elfcpp_file.h"
#include "stringpool.h"
#include "workqueue.h"
#include "fileread.h"
#include "output.h"
#include "archive.h"
namespace gold
{
class Input_argument;
class Incremental_inputs_checker;
class Incremental_script_entry;
class Incremental_object_entry;
class Incremental_dynobj_entry;
class Incremental_archive_entry;
class Incremental_inputs;
class Incremental_binary;
class Incremental_library;
class Object;
// Incremental input type as stored in .gnu_incremental_inputs.
enum Incremental_input_type
{
INCREMENTAL_INPUT_OBJECT = 1,
INCREMENTAL_INPUT_ARCHIVE_MEMBER = 2,
INCREMENTAL_INPUT_ARCHIVE = 3,
INCREMENTAL_INPUT_SHARED_LIBRARY = 4,
INCREMENTAL_INPUT_SCRIPT = 5
};
// Incremental input file flags.
// The input file type is stored in the lower eight bits.
enum Incremental_input_flags
{
INCREMENTAL_INPUT_IN_SYSTEM_DIR = 0x8000,
INCREMENTAL_INPUT_AS_NEEDED = 0x4000
};
// Symbol flags for the incremental symbol table.
// These flags are stored in the top two bits of
// the symbol index field.
enum Incremental_shlib_symbol_flags
{
// Symbol is defined in this library.
INCREMENTAL_SHLIB_SYM_DEF = 2,
// Symbol is defined in this library, with a COPY relocation.
INCREMENTAL_SHLIB_SYM_COPY = 3
};
static const int INCREMENTAL_SHLIB_SYM_FLAGS_SHIFT = 30;
// Return TRUE if a section of type SH_TYPE can be updated in place
// during an incremental update.
bool
can_incremental_update(unsigned int sh_type);
// Create an Incremental_binary object for FILE. Returns NULL is this is not
// possible, e.g. FILE is not an ELF file or has an unsupported target.
Incremental_binary*
open_incremental_binary(Output_file* file);
// Base class for recording each input file.
class Incremental_input_entry
{
public:
Incremental_input_entry(Stringpool::Key filename_key, unsigned int arg_serial,
Timespec mtime)
: filename_key_(filename_key), file_index_(0), offset_(0), info_offset_(0),
arg_serial_(arg_serial), mtime_(mtime), is_in_system_directory_(false),
as_needed_(false)
{ }
virtual
~Incremental_input_entry()
{ }
// Return the type of input file.
Incremental_input_type
type() const
{ return this->do_type(); }
// Set the index and section offset of this input file entry.
void
set_offset(unsigned int file_index, unsigned int offset)
{
this->file_index_ = file_index;
this->offset_ = offset;
}
// Set the section offset of the supplemental information for this entry.
void
set_info_offset(unsigned int info_offset)
{ this->info_offset_ = info_offset; }
// Get the index of this input file entry.
unsigned int
get_file_index() const
{ return this->file_index_; }
// Get the section offset of this input file entry.
unsigned int
get_offset() const
{ return this->offset_; }
// Get the section offset of the supplemental information for this entry.
unsigned int
get_info_offset() const
{ return this->info_offset_; }
// Get the stringpool key for the input filename.
Stringpool::Key
get_filename_key() const
{ return this->filename_key_; }
// Get the serial number of the input file.
unsigned int
arg_serial() const
{ return this->arg_serial_; }
// Get the modification time of the input file.
const Timespec&
get_mtime() const
{ return this->mtime_; }
// Record that the file was found in a system directory.
void
set_is_in_system_directory()
{ this->is_in_system_directory_ = true; }
// Return TRUE if the file was found in a system directory.
bool
is_in_system_directory() const
{ return this->is_in_system_directory_; }
// Record that the file was linked with --as-needed.
void
set_as_needed()
{ this->as_needed_ = true; }
// Return TRUE if the file was linked with --as-needed.
bool
as_needed() const
{ return this->as_needed_; }
// Return a pointer to the derived Incremental_script_entry object.
// Return NULL for input entries that are not script files.
Incremental_script_entry*
script_entry()
{ return this->do_script_entry(); }
// Return a pointer to the derived Incremental_object_entry object.
// Return NULL for input entries that are not object files.
Incremental_object_entry*
object_entry()
{ return this->do_object_entry(); }
// Return a pointer to the derived Incremental_dynobj_entry object.
// Return NULL for input entries that are not shared object files.
Incremental_dynobj_entry*
dynobj_entry()
{ return this->do_dynobj_entry(); }
// Return a pointer to the derived Incremental_archive_entry object.
// Return NULL for input entries that are not archive files.
Incremental_archive_entry*
archive_entry()
{ return this->do_archive_entry(); }
protected:
// Return the type of input file.
virtual Incremental_input_type
do_type() const = 0;
// Return a pointer to the derived Incremental_script_entry object.
// Return NULL for input entries that are not script files.
virtual Incremental_script_entry*
do_script_entry()
{ return NULL; }
// Return a pointer to the derived Incremental_object_entry object.
// Return NULL for input entries that are not object files.
virtual Incremental_object_entry*
do_object_entry()
{ return NULL; }
// Return a pointer to the derived Incremental_dynobj_entry object.
// Return NULL for input entries that are not shared object files.
virtual Incremental_dynobj_entry*
do_dynobj_entry()
{ return NULL; }
// Return a pointer to the derived Incremental_archive_entry object.
// Return NULL for input entries that are not archive files.
virtual Incremental_archive_entry*
do_archive_entry()
{ return NULL; }
private:
// Key of the filename string in the section stringtable.
Stringpool::Key filename_key_;
// Index of the entry in the output section.
unsigned int file_index_;
// Offset of the entry in the output section.
unsigned int offset_;
// Offset of the extra information in the output section.
unsigned int info_offset_;
// Serial number of the file in the argument list.
unsigned int arg_serial_;
// Last modification time of the file.
Timespec mtime_;
// TRUE if the file was found in a system directory.
bool is_in_system_directory_;
// TRUE if the file was linked with --as-needed.
bool as_needed_;
};
// Information about a script input that will persist during the whole linker
// run. Needed only during an incremental build to retrieve the input files
// added by this script.
class Script_info
{
public:
Script_info(const std::string& filename)
: filename_(filename), input_file_index_(0),
incremental_script_entry_(NULL)
{ }
Script_info(const std::string& filename, unsigned int input_file_index)
: filename_(filename), input_file_index_(input_file_index),
incremental_script_entry_(NULL)
{ }
// Store a pointer to the incremental information for this script.
void
set_incremental_info(Incremental_script_entry* entry)
{ this->incremental_script_entry_ = entry; }
// Return the filename.
const std::string&
filename() const
{ return this->filename_; }
// Return the input file index.
unsigned int
input_file_index() const
{ return this->input_file_index_; }
// Return the pointer to the incremental information for this script.
Incremental_script_entry*
incremental_info() const
{ return this->incremental_script_entry_; }
private:
const std::string filename_;
unsigned int input_file_index_;
Incremental_script_entry* incremental_script_entry_;
};
// Class for recording input scripts.
class Incremental_script_entry : public Incremental_input_entry
{
public:
Incremental_script_entry(Stringpool::Key filename_key,
unsigned int arg_serial, Script_info* /*script*/,
Timespec mtime)
: Incremental_input_entry(filename_key, arg_serial, mtime),
objects_()
{ }
// Add a member object to the archive.
void
add_object(Incremental_input_entry* obj_entry)
{
this->objects_.push_back(obj_entry);
}
// Return the number of objects included by this script.
unsigned int
get_object_count()
{ return this->objects_.size(); }
// Return the Nth object.
Incremental_input_entry*
get_object(unsigned int n)
{
gold_assert(n < this->objects_.size());
return this->objects_[n];
}
protected:
virtual Incremental_input_type
do_type() const
{ return INCREMENTAL_INPUT_SCRIPT; }
// Return a pointer to the derived Incremental_script_entry object.
virtual Incremental_script_entry*
do_script_entry()
{ return this; }
private:
// Objects that have been included by this script.
std::vector<Incremental_input_entry*> objects_;
};
// Class for recording input object files.
class Incremental_object_entry : public Incremental_input_entry
{
public:
Incremental_object_entry(Stringpool::Key filename_key, Object* obj,
unsigned int arg_serial, Timespec mtime)
: Incremental_input_entry(filename_key, arg_serial, mtime), obj_(obj),
is_member_(false), sections_(), groups_()
{ this->sections_.reserve(obj->shnum()); }
// Get the object.
Object*
object() const
{ return this->obj_; }
// Record that this object is an archive member.
void
set_is_member()
{ this->is_member_ = true; }
// Return true if this object is an archive member.
bool
is_member() const
{ return this->is_member_; }
// Add an input section.
void
add_input_section(unsigned int shndx, Stringpool::Key name_key, off_t sh_size)
{ this->sections_.push_back(Input_section(shndx, name_key, sh_size)); }
// Return the number of input sections in this object.
unsigned int
get_input_section_count() const
{ return this->sections_.size(); }
// Return the input section index for the Nth input section.
Stringpool::Key
get_input_section_index(unsigned int n) const
{ return this->sections_[n].shndx_; }
// Return the stringpool key of the Nth input section.
Stringpool::Key
get_input_section_name_key(unsigned int n) const
{ return this->sections_[n].name_key_; }
// Return the size of the Nth input section.
off_t
get_input_section_size(unsigned int n) const
{ return this->sections_[n].sh_size_; }
// Add a kept COMDAT group.
void
add_comdat_group(Stringpool::Key signature_key)
{ this->groups_.push_back(signature_key); }
// Return the number of COMDAT groups.
unsigned int
get_comdat_group_count() const
{ return this->groups_.size(); }
// Return the stringpool key for the signature of the Nth comdat group.
Stringpool::Key
get_comdat_signature_key(unsigned int n) const
{ return this->groups_[n]; }
protected:
virtual Incremental_input_type
do_type() const
{
return (this->is_member_
? INCREMENTAL_INPUT_ARCHIVE_MEMBER
: INCREMENTAL_INPUT_OBJECT);
}
// Return a pointer to the derived Incremental_object_entry object.
virtual Incremental_object_entry*
do_object_entry()
{ return this; }
private:
// The object file itself.
Object* obj_;
// Whether this object is an archive member.
bool is_member_;
// Input sections.
struct Input_section
{
Input_section(unsigned int shndx, Stringpool::Key name_key, off_t sh_size)
: shndx_(shndx), name_key_(name_key), sh_size_(sh_size)
{ }
unsigned int shndx_;
Stringpool::Key name_key_;
off_t sh_size_;
};
std::vector<Input_section> sections_;
// COMDAT groups.
std::vector<Stringpool::Key> groups_;
};
// Class for recording shared library input files.
class Incremental_dynobj_entry : public Incremental_input_entry
{
public:
Incremental_dynobj_entry(Stringpool::Key filename_key,
Stringpool::Key soname_key, Object* obj,
unsigned int arg_serial, Timespec mtime)
: Incremental_input_entry(filename_key, arg_serial, mtime),
soname_key_(soname_key), obj_(obj)
{ }
// Get the object.
Object*
object() const
{ return this->obj_; }
// Get the stringpool key for the soname.
Stringpool::Key
get_soname_key() const
{ return this->soname_key_; }
protected:
virtual Incremental_input_type
do_type() const
{ return INCREMENTAL_INPUT_SHARED_LIBRARY; }
// Return a pointer to the derived Incremental_dynobj_entry object.
virtual Incremental_dynobj_entry*
do_dynobj_entry()
{ return this; }
private:
// Key of the soname string in the section stringtable.
Stringpool::Key soname_key_;
// The object file itself.
Object* obj_;
};
// Class for recording archive library input files.
class Incremental_archive_entry : public Incremental_input_entry
{
public:
Incremental_archive_entry(Stringpool::Key filename_key,
unsigned int arg_serial, Timespec mtime)
: Incremental_input_entry(filename_key, arg_serial, mtime), members_(),
unused_syms_()
{ }
// Add a member object to the archive.
void
add_object(Incremental_object_entry* obj_entry)
{
this->members_.push_back(obj_entry);
obj_entry->set_is_member();
}
// Add an unused global symbol to the archive.
void
add_unused_global_symbol(Stringpool::Key symbol_key)
{ this->unused_syms_.push_back(symbol_key); }
// Return the number of member objects included in the link.
unsigned int
get_member_count()
{ return this->members_.size(); }
// Return the Nth member object.
Incremental_object_entry*
get_member(unsigned int n)
{ return this->members_[n]; }
// Return the number of unused global symbols in this archive.
unsigned int
get_unused_global_symbol_count()
{ return this->unused_syms_.size(); }
// Return the Nth unused global symbol.
Stringpool::Key
get_unused_global_symbol(unsigned int n)
{ return this->unused_syms_[n]; }
protected:
virtual Incremental_input_type
do_type() const
{ return INCREMENTAL_INPUT_ARCHIVE; }
// Return a pointer to the derived Incremental_archive_entry object.
virtual Incremental_archive_entry*
do_archive_entry()
{ return this; }
private:
// Members of the archive that have been included in the link.
std::vector<Incremental_object_entry*> members_;
// Unused global symbols from this archive.
std::vector<Stringpool::Key> unused_syms_;
};
// This class contains the information needed during an incremental
// build about the inputs necessary to build the .gnu_incremental_inputs.
class Incremental_inputs
{
public:
typedef std::vector<Incremental_input_entry*> Input_list;
Incremental_inputs()
: inputs_(), command_line_(), command_line_key_(0),
strtab_(new Stringpool()), current_object_(NULL),
current_object_entry_(NULL), inputs_section_(NULL),
symtab_section_(NULL), relocs_section_(NULL),
reloc_count_(0)
{ }
~Incremental_inputs() { delete this->strtab_; }
// Record the command line.
void
report_command_line(int argc, const char* const* argv);
// Record the initial info for archive file ARCHIVE.
void
report_archive_begin(Library_base* arch, unsigned int arg_serial,
Script_info* script_info);
// Record the final info for archive file ARCHIVE.
void
report_archive_end(Library_base* arch);
// Record the info for object file OBJ. If ARCH is not NULL,
// attach the object file to the archive.
void
report_object(Object* obj, unsigned int arg_serial, Library_base* arch,
Script_info* script_info);
// Record an input section belonging to object file OBJ.
void
report_input_section(Object* obj, unsigned int shndx, const char* name,
off_t sh_size);
// Record a kept COMDAT group belonging to object file OBJ.
void
report_comdat_group(Object* obj, const char* name);
// Record the info for input script SCRIPT.
void
report_script(Script_info* script, unsigned int arg_serial,
Timespec mtime);
// Return the running count of incremental relocations.
unsigned int
get_reloc_count() const
{ return this->reloc_count_; }
// Update the running count of incremental relocations.
void
set_reloc_count(unsigned int count)
{ this->reloc_count_ = count; }
// Prepare for layout. Called from Layout::finalize.
void
finalize();
// Create the .gnu_incremental_inputs and related sections.
void
create_data_sections(Symbol_table* symtab);
// Return the .gnu_incremental_inputs section.
Output_section_data*
inputs_section() const
{ return this->inputs_section_; }
// Return the .gnu_incremental_symtab section.
Output_data_space*
symtab_section() const
{ return this->symtab_section_; }
// Return the .gnu_incremental_relocs section.
Output_data_space*
relocs_section() const
{ return this->relocs_section_; }
// Return the .gnu_incremental_got_plt section.
Output_data_space*
got_plt_section() const
{ return this->got_plt_section_; }
// Return the .gnu_incremental_strtab stringpool.
Stringpool*
get_stringpool() const
{ return this->strtab_; }
// Return the canonical form of the command line, as will be stored in
// .gnu_incremental_strtab.
const std::string&
command_line() const
{ return this->command_line_; }
// Return the stringpool key of the command line.
Stringpool::Key
command_line_key() const
{ return this->command_line_key_; }
// Return the number of input files.
int
input_file_count() const
{ return this->inputs_.size(); }
// Return the input files.
const Input_list&
input_files() const
{ return this->inputs_; }
// Return the sh_entsize value for the .gnu_incremental_relocs section.
unsigned int
relocs_entsize() const;
private:
// The list of input files.
Input_list inputs_;
// Canonical form of the command line, as will be stored in
// .gnu_incremental_strtab.
std::string command_line_;
// The key of the command line string in the string pool.
Stringpool::Key command_line_key_;
// The .gnu_incremental_strtab string pool associated with the
// .gnu_incremental_inputs.
Stringpool* strtab_;
// Keep track of the object currently being processed.
Object* current_object_;
Incremental_object_entry* current_object_entry_;
// The .gnu_incremental_inputs section.
Output_section_data* inputs_section_;
// The .gnu_incremental_symtab section.
Output_data_space* symtab_section_;
// The .gnu_incremental_relocs section.
Output_data_space* relocs_section_;
// The .gnu_incremental_got_plt section.
Output_data_space* got_plt_section_;
// Total count of incremental relocations. Updated during Scan_relocs
// phase at the completion of each object file.
unsigned int reloc_count_;
};
// Reader class for global symbol info from an object file entry in
// the .gnu_incremental_inputs section.
template<bool big_endian>
class Incremental_global_symbol_reader
{
private:
typedef elfcpp::Swap<32, big_endian> Swap32;
public:
Incremental_global_symbol_reader(const unsigned char* p)
: p_(p)
{ }
unsigned int
output_symndx() const
{ return Swap32::readval(this->p_); }
unsigned int
shndx() const
{ return Swap32::readval(this->p_ + 4); }
unsigned int
next_offset() const
{ return Swap32::readval(this->p_ + 8); }
unsigned int
reloc_count() const
{ return Swap32::readval(this->p_ + 12); }
unsigned int
reloc_offset() const
{ return Swap32::readval(this->p_ + 16); }
private:
// Base address of the symbol entry.
const unsigned char* p_;
};
// Reader class for .gnu_incremental_inputs section.
template<int size, bool big_endian>
class Incremental_inputs_reader
{
private:
typedef elfcpp::Swap<size, big_endian> Swap;
typedef elfcpp::Swap<16, big_endian> Swap16;
typedef elfcpp::Swap<32, big_endian> Swap32;
typedef elfcpp::Swap<64, big_endian> Swap64;
public:
// Size of the .gnu_incremental_inputs header.
// (3 x 4-byte fields, plus 4 bytes padding.)
static const unsigned int header_size = 16;
// Size of an input file entry.
// (2 x 4-byte fields, 1 x 12-byte field, 2 x 2-byte fields.)
static const unsigned int input_entry_size = 24;
// Size of the first part of the supplemental info block for
// relocatable objects and archive members.
// (7 x 4-byte fields, plus 4 bytes padding.)
static const unsigned int object_info_size = 32;
// Size of an input section entry.
// (2 x 4-byte fields, 2 x address-sized fields.)
static const unsigned int input_section_entry_size = 8 + 2 * size / 8;
// Size of a global symbol entry in the supplemental info block.
// (5 x 4-byte fields.)
static const unsigned int global_sym_entry_size = 20;
Incremental_inputs_reader()
: p_(NULL), strtab_(NULL, 0), input_file_count_(0)
{ }
Incremental_inputs_reader(const unsigned char* p,
const elfcpp::Elf_strtab& strtab)
: p_(p), strtab_(strtab)
{ this->input_file_count_ = Swap32::readval(this->p_ + 4); }
// Return the version number.
unsigned int
version() const
{ return Swap32::readval(this->p_); }
// Return the count of input file entries.
unsigned int
input_file_count() const
{ return this->input_file_count_; }
// Return the command line.
const char*
command_line() const
{
unsigned int offset = Swap32::readval(this->p_ + 8);
return this->get_string(offset);
}
// Reader class for an input file entry and its supplemental info.
class Incremental_input_entry_reader
{
private:
static const unsigned int object_info_size =
Incremental_inputs_reader<size, big_endian>::object_info_size;
static const unsigned int input_section_entry_size =
Incremental_inputs_reader<size, big_endian>::input_section_entry_size;
static const unsigned int global_sym_entry_size =
Incremental_inputs_reader<size, big_endian>::global_sym_entry_size;
public:
Incremental_input_entry_reader(const Incremental_inputs_reader* inputs,
unsigned int offset)
: inputs_(inputs), offset_(offset)
{
this->info_offset_ = Swap32::readval(inputs->p_ + offset + 4);
this->flags_ = Swap16::readval(this->inputs_->p_ + offset + 20);
}
// Return the filename.
const char*
filename() const
{
unsigned int offset = Swap32::readval(this->inputs_->p_ + this->offset_);
return this->inputs_->get_string(offset);
}
// Return the argument serial number.
unsigned int
arg_serial() const
{
return Swap16::readval(this->inputs_->p_ + this->offset_ + 22);
}
// Return the timestamp.
Timespec
get_mtime() const
{
Timespec t;
const unsigned char* p = this->inputs_->p_ + this->offset_ + 8;
t.seconds = Swap64::readval(p);
t.nanoseconds = Swap32::readval(p+8);
return t;
}
// Return the type of input file.
Incremental_input_type
type() const
{ return static_cast<Incremental_input_type>(this->flags_ & 0xff); }
// Return TRUE if the file was found in a system directory.
bool
is_in_system_directory() const
{ return (this->flags_ & INCREMENTAL_INPUT_IN_SYSTEM_DIR) != 0; }
// Return TRUE if the file was linked with --as-needed.
bool
as_needed() const
{ return (this->flags_ & INCREMENTAL_INPUT_AS_NEEDED) != 0; }
// Return the input section count -- for objects only.
unsigned int
get_input_section_count() const
{
gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT
|| this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER);
return Swap32::readval(this->inputs_->p_ + this->info_offset_);
}
// Return the soname -- for shared libraries only.
const char*
get_soname() const
{
gold_assert(this->type() == INCREMENTAL_INPUT_SHARED_LIBRARY);
unsigned int offset = Swap32::readval(this->inputs_->p_
+ this->info_offset_);
return this->inputs_->get_string(offset);
}
// Return the offset of the supplemental info for symbol SYMNDX --
// for objects only.
unsigned int
get_symbol_offset(unsigned int symndx) const
{
gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT
|| this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER);
unsigned int section_count = this->get_input_section_count();
return (this->info_offset_
+ this->object_info_size
+ section_count * this->input_section_entry_size
+ symndx * this->global_sym_entry_size);
}
// Return the global symbol count -- for objects & shared libraries only.
unsigned int
get_global_symbol_count() const
{
gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT
|| this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER
|| this->type() == INCREMENTAL_INPUT_SHARED_LIBRARY);
return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 4);
}
// Return the offset of the first local symbol -- for objects only.
unsigned int
get_local_symbol_offset() const
{
gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT
|| this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER);
return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 8);
}
// Return the local symbol count -- for objects only.
unsigned int
get_local_symbol_count() const
{
gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT
|| this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER);
return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 12);
}
// Return the index of the first dynamic relocation -- for objects only.
unsigned int
get_first_dyn_reloc() const
{
gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT
|| this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER);
return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 16);
}
// Return the dynamic relocation count -- for objects only.
unsigned int
get_dyn_reloc_count() const
{
gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT
|| this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER);
return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 20);
}
// Return the COMDAT group count -- for objects only.
unsigned int
get_comdat_group_count() const
{
gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT
|| this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER);
return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 24);
}
// Return the object count -- for scripts only.
unsigned int
get_object_count() const
{
gold_assert(this->type() == INCREMENTAL_INPUT_SCRIPT);
return Swap32::readval(this->inputs_->p_ + this->info_offset_);
}
// Return the input file offset for object N -- for scripts only.
unsigned int
get_object_offset(unsigned int n) const
{
gold_assert(this->type() == INCREMENTAL_INPUT_SCRIPT);
return Swap32::readval(this->inputs_->p_ + this->info_offset_
+ 4 + n * 4);
}
// Return the member count -- for archives only.
unsigned int
get_member_count() const
{
gold_assert(this->type() == INCREMENTAL_INPUT_ARCHIVE);
return Swap32::readval(this->inputs_->p_ + this->info_offset_);
}
// Return the unused symbol count -- for archives only.
unsigned int
get_unused_symbol_count() const
{
gold_assert(this->type() == INCREMENTAL_INPUT_ARCHIVE);
return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 4);
}
// Return the input file offset for archive member N -- for archives only.
unsigned int
get_member_offset(unsigned int n) const
{
gold_assert(this->type() == INCREMENTAL_INPUT_ARCHIVE);
return Swap32::readval(this->inputs_->p_ + this->info_offset_
+ 8 + n * 4);
}
// Return the Nth unused global symbol -- for archives only.
const char*
get_unused_symbol(unsigned int n) const
{
gold_assert(this->type() == INCREMENTAL_INPUT_ARCHIVE);
unsigned int member_count = this->get_member_count();
unsigned int offset = Swap32::readval(this->inputs_->p_
+ this->info_offset_ + 8
+ member_count * 4
+ n * 4);
return this->inputs_->get_string(offset);
}
// Information about an input section.
struct Input_section_info
{
const char* name;
unsigned int output_shndx;
off_t sh_offset;
off_t sh_size;
};
// Return info about the Nth input section -- for objects only.
Input_section_info
get_input_section(unsigned int n) const
{
Input_section_info info;
const unsigned char* p = (this->inputs_->p_
+ this->info_offset_
+ this->object_info_size
+ n * this->input_section_entry_size);
unsigned int name_offset = Swap32::readval(p);
info.name = this->inputs_->get_string(name_offset);
info.output_shndx = Swap32::readval(p + 4);
info.sh_offset = Swap::readval(p + 8);
info.sh_size = Swap::readval(p + 8 + size / 8);
return info;
}
// Return info about the Nth global symbol -- for objects only.
Incremental_global_symbol_reader<big_endian>
get_global_symbol_reader(unsigned int n) const
{
gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT
|| this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER);
unsigned int section_count = this->get_input_section_count();
const unsigned char* p = (this->inputs_->p_
+ this->info_offset_
+ this->object_info_size
+ section_count * this->input_section_entry_size
+ n * this->global_sym_entry_size);
return Incremental_global_symbol_reader<big_endian>(p);
}
// Return the signature of the Nth comdat group -- for objects only.
const char*
get_comdat_group_signature(unsigned int n) const
{
unsigned int section_count = this->get_input_section_count();
unsigned int symbol_count = this->get_global_symbol_count();
const unsigned char* p = (this->inputs_->p_
+ this->info_offset_
+ this->object_info_size
+ section_count * this->input_section_entry_size
+ symbol_count * this->global_sym_entry_size
+ n * 4);
unsigned int name_offset = Swap32::readval(p);
return this->inputs_->get_string(name_offset);
}
// Return the output symbol index for the Nth global symbol -- for shared
// libraries only. Sets *IS_DEF to TRUE if the symbol is defined in this
// input file. Sets *IS_COPY to TRUE if the symbol was copied from this
// input file with a COPY relocation.
unsigned int
get_output_symbol_index(unsigned int n, bool* is_def, bool* is_copy)
{
gold_assert(this->type() == INCREMENTAL_INPUT_SHARED_LIBRARY);
const unsigned char* p = (this->inputs_->p_
+ this->info_offset_ + 8
+ n * 4);
unsigned int output_symndx = Swap32::readval(p);
unsigned int flags = output_symndx >> INCREMENTAL_SHLIB_SYM_FLAGS_SHIFT;
output_symndx &= ((1U << INCREMENTAL_SHLIB_SYM_FLAGS_SHIFT) - 1);
switch (flags)
{
case INCREMENTAL_SHLIB_SYM_DEF:
*is_def = true;
*is_copy = false;
break;
case INCREMENTAL_SHLIB_SYM_COPY:
*is_def = true;
*is_copy = true;
break;
default:
*is_def = false;
*is_copy = false;
}
return output_symndx;
}
private:
// The reader instance for the containing section.
const Incremental_inputs_reader* inputs_;
// The flags, including the type of input file.
unsigned int flags_;
// Section offset to the input file entry.
unsigned int offset_;
// Section offset to the supplemental info for the input file.
unsigned int info_offset_;
};
// Return the offset of an input file entry given its index N.
unsigned int
input_file_offset(unsigned int n) const
{
gold_assert(n < this->input_file_count_);
return this->header_size + n * this->input_entry_size;
}
// Return the index of an input file entry given its OFFSET.
unsigned int
input_file_index(unsigned int offset) const
{
int n = ((offset - this->header_size) / this->input_entry_size);
gold_assert(input_file_offset(n) == offset);
return n;
}
// Return a reader for the Nth input file entry.
Incremental_input_entry_reader
input_file(unsigned int n) const
{ return Incremental_input_entry_reader(this, this->input_file_offset(n)); }
// Return a reader for the input file entry at OFFSET.
Incremental_input_entry_reader
input_file_at_offset(unsigned int offset) const
{
gold_assert(offset < (this->header_size
+ this->input_file_count_ * this->input_entry_size));
return Incremental_input_entry_reader(this, offset);
}
// Return a reader for the global symbol info at OFFSET.
Incremental_global_symbol_reader<big_endian>
global_symbol_reader_at_offset(unsigned int offset) const
{
const unsigned char* p = this->p_ + offset;
return Incremental_global_symbol_reader<big_endian>(p);
}
private:
// Lookup a string in the ELF string table.
const char* get_string(unsigned int offset) const
{
const char* s;
if (this->strtab_.get_c_string(offset, &s))
return s;
return NULL;
}
// Base address of the .gnu_incremental_inputs section.
const unsigned char* p_;
// The associated ELF string table.
elfcpp::Elf_strtab strtab_;
// The number of input file entries in this section.
unsigned int input_file_count_;
};
// Reader class for the .gnu_incremental_symtab section.
template<bool big_endian>
class Incremental_symtab_reader
{
public:
Incremental_symtab_reader()
: p_(NULL), len_(0)
{ }
Incremental_symtab_reader(const unsigned char* p, off_t len)
: p_(p), len_(len)
{ }
// Return the count of symbols in this section.
unsigned int
symbol_count() const
{ return static_cast<unsigned int>(this->len_ / 4); }
// Return the list head for symbol table entry N.
unsigned int
get_list_head(unsigned int n) const
{ return elfcpp::Swap<32, big_endian>::readval(this->p_ + 4 * n); }
private:
// Base address of the .gnu_incremental_relocs section.
const unsigned char* p_;
// Size of the section.
off_t len_;
};
// Reader class for the .gnu_incremental_relocs section.
template<int size, bool big_endian>
class Incremental_relocs_reader
{
private:
// Size of each field.
static const unsigned int field_size = size / 8;
public:
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
typedef typename elfcpp::Elf_types<size>::Elf_Swxword Addend;
// Size of each entry.
static const unsigned int reloc_size = 8 + 2 * field_size;
Incremental_relocs_reader()
: p_(NULL), len_(0)
{ }
Incremental_relocs_reader(const unsigned char* p, off_t len)
: p_(p), len_(len)
{ }
// Return the count of relocations in this section.
unsigned int
reloc_count() const
{ return static_cast<unsigned int>(this->len_ / reloc_size); }
// Return the relocation type for relocation entry at offset OFF.
unsigned int
get_r_type(unsigned int off) const
{ return elfcpp::Swap<32, big_endian>::readval(this->p_ + off); }
// Return the output section index for relocation entry at offset OFF.
unsigned int
get_r_shndx(unsigned int off) const
{ return elfcpp::Swap<32, big_endian>::readval(this->p_ + off + 4); }
// Return the output section offset for relocation entry at offset OFF.
Address
get_r_offset(unsigned int off) const
{ return elfcpp::Swap<size, big_endian>::readval(this->p_ + off + 8); }
// Return the addend for relocation entry at offset OFF.
Addend
get_r_addend(unsigned int off) const
{
return elfcpp::Swap<size, big_endian>::readval(this->p_ + off + 8
+ this->field_size);
}
// Return a pointer to the relocation entry at offset OFF.
const unsigned char*
data(unsigned int off) const
{ return this->p_ + off; }
private:
// Base address of the .gnu_incremental_relocs section.
const unsigned char* p_;
// Size of the section.
off_t len_;
};
// Reader class for the .gnu_incremental_got_plt section.
template<bool big_endian>
class Incremental_got_plt_reader
{
public:
Incremental_got_plt_reader()
: p_(NULL), got_count_(0), got_desc_p_(NULL), plt_desc_p_(NULL)
{ }
Incremental_got_plt_reader(const unsigned char* p) : p_(p)
{
this->got_count_ = elfcpp::Swap<32, big_endian>::readval(p);
this->got_desc_p_ = p + 8 + ((this->got_count_ + 3) & ~3);
this->plt_desc_p_ = this->got_desc_p_ + this->got_count_ * 8;
}
// Return the GOT entry count.
unsigned int
get_got_entry_count() const
{
return this->got_count_;
}
// Return the PLT entry count.
unsigned int
get_plt_entry_count() const
{
return elfcpp::Swap<32, big_endian>::readval(this->p_ + 4);
}
// Return the GOT type for GOT entry N.
unsigned int
get_got_type(unsigned int n)
{
return this->p_[8 + n];
}
// Return the symbol index for GOT entry N.
unsigned int
get_got_symndx(unsigned int n)
{
return elfcpp::Swap<32, big_endian>::readval(this->got_desc_p_ + n * 8);
}
// Return the input file index for GOT entry N.
unsigned int
get_got_input_index(unsigned int n)
{
return elfcpp::Swap<32, big_endian>::readval(this->got_desc_p_ + n * 8 + 4);
}
// Return the PLT descriptor for PLT entry N.
unsigned int
get_plt_desc(unsigned int n)
{
return elfcpp::Swap<32, big_endian>::readval(this->plt_desc_p_ + n * 4);
}
private:
// Base address of the .gnu_incremental_got_plt section.
const unsigned char* p_;
// GOT entry count.
unsigned int got_count_;
// Base address of the GOT descriptor array.
const unsigned char* got_desc_p_;
// Base address of the PLT descriptor array.
const unsigned char* plt_desc_p_;
};
// An object representing the ELF file we edit during an incremental build.
// Similar to Object or Dynobj, but operates on Output_file and contains
// methods to support incremental updating. This is the abstract parent class
// implemented in Sized_incremental_binary<size, big_endian> for a specific
// endianness and size.
class Incremental_binary
{
public:
Incremental_binary(Output_file* output, Target* /*target*/)
: input_args_map_(), library_map_(), script_map_(),
output_(output)
{ }
virtual
~Incremental_binary()
{ }
// Check the .gnu_incremental_inputs section to see whether an incremental
// build is possible.
bool
check_inputs(const Command_line& cmdline,
Incremental_inputs* incremental_inputs)
{ return this->do_check_inputs(cmdline, incremental_inputs); }
// Report an error.
void
error(const char* format, ...) const ATTRIBUTE_PRINTF_2;
// Proxy class for a sized Incremental_input_entry_reader.
class Input_reader
{
public:
Input_reader()
{ }
virtual
~Input_reader()
{ }
const char*
filename() const
{ return this->do_filename(); }
Timespec
get_mtime() const
{ return this->do_get_mtime(); }
Incremental_input_type
type() const
{ return this->do_type(); }
unsigned int
arg_serial() const
{ return this->do_arg_serial(); }
unsigned int
get_unused_symbol_count() const
{ return this->do_get_unused_symbol_count(); }
const char*
get_unused_symbol(unsigned int n) const
{ return this->do_get_unused_symbol(n); }
protected:
virtual const char*
do_filename() const = 0;
virtual Timespec
do_get_mtime() const = 0;
virtual Incremental_input_type
do_type() const = 0;
virtual unsigned int
do_arg_serial() const = 0;
virtual unsigned int
do_get_unused_symbol_count() const = 0;
virtual const char*
do_get_unused_symbol(unsigned int n) const = 0;
};
// Return the number of input files.
unsigned int
input_file_count() const
{ return this->do_input_file_count(); }
// Return an Input_reader for input file N.
const Input_reader*
get_input_reader(unsigned int n) const
{ return this->do_get_input_reader(n); }
// Return TRUE if the input file N has changed since the last link.
bool
file_has_changed(unsigned int n) const
{ return this->do_file_has_changed(n); }
// Return the Input_argument for input file N. Returns NULL if
// the Input_argument is not available.
const Input_argument*
get_input_argument(unsigned int n) const
{
const Input_reader* input_file = this->do_get_input_reader(n);
unsigned int arg_serial = input_file->arg_serial();
if (arg_serial == 0 || arg_serial > this->input_args_map_.size())
return NULL;
return this->input_args_map_[arg_serial - 1];
}
// Return an Incremental_library for the given input file.
Incremental_library*
get_library(unsigned int n) const
{ return this->library_map_[n]; }
// Return a Script_info for the given input file.
Script_info*
get_script_info(unsigned int n) const
{ return this->script_map_[n]; }
// Initialize the layout of the output file based on the existing
// output file.
void
init_layout(Layout* layout)
{ this->do_init_layout(layout); }
// Mark regions of the input file that must be kept unchanged.
void
reserve_layout(unsigned int input_file_index)
{ this->do_reserve_layout(input_file_index); }
// Process the GOT and PLT entries from the existing output file.
void
process_got_plt(Symbol_table* symtab, Layout* layout)
{ this->do_process_got_plt(symtab, layout); }
// Emit COPY relocations from the existing output file.
void
emit_copy_relocs(Symbol_table* symtab)
{ this->do_emit_copy_relocs(symtab); }
// Apply incremental relocations for symbols whose values have changed.
void
apply_incremental_relocs(const Symbol_table* symtab, Layout* layout,
Output_file* of)
{ this->do_apply_incremental_relocs(symtab, layout, of); }
// Functions and types for the elfcpp::Elf_file interface. This
// permit us to use Incremental_binary as the File template parameter for
// elfcpp::Elf_file.
// The View class is returned by view. It must support a single
// method, data(). This is trivial, because Output_file::get_output_view
// does what we need.
class View
{
public:
View(const unsigned char* p)
: p_(p)
{ }
const unsigned char*
data() const
{ return this->p_; }
private:
const unsigned char* p_;
};
// Return a View.
View
view(off_t file_offset, section_size_type data_size)
{ return View(this->output_->get_input_view(file_offset, data_size)); }
// A location in the file.
struct Location
{
off_t file_offset;
off_t data_size;
Location(off_t fo, section_size_type ds)
: file_offset(fo), data_size(ds)
{ }
Location()
: file_offset(0), data_size(0)
{ }
};
// Get a View given a Location.
View
view(Location loc)
{ return View(this->view(loc.file_offset, loc.data_size)); }
// Return the Output_file.
Output_file*
output_file()
{ return this->output_; }
protected:
// Check the .gnu_incremental_inputs section to see whether an incremental
// build is possible.
virtual bool
do_check_inputs(const Command_line& cmdline,
Incremental_inputs* incremental_inputs) = 0;
// Return TRUE if input file N has changed since the last incremental link.
virtual bool
do_file_has_changed(unsigned int n) const = 0;
// Initialize the layout of the output file based on the existing
// output file.
virtual void
do_init_layout(Layout* layout) = 0;
// Mark regions of the input file that must be kept unchanged.
virtual void
do_reserve_layout(unsigned int input_file_index) = 0;
// Process the GOT and PLT entries from the existing output file.
virtual void
do_process_got_plt(Symbol_table* symtab, Layout* layout) = 0;
// Emit COPY relocations from the existing output file.
virtual void
do_emit_copy_relocs(Symbol_table* symtab) = 0;
// Apply incremental relocations for symbols whose values have changed.
virtual void
do_apply_incremental_relocs(const Symbol_table*, Layout*, Output_file*) = 0;
virtual unsigned int
do_input_file_count() const = 0;
virtual const Input_reader*
do_get_input_reader(unsigned int) const = 0;
// Map from input file index to Input_argument.
std::vector<const Input_argument*> input_args_map_;
// Map from an input file index to an Incremental_library.
std::vector<Incremental_library*> library_map_;
// Map from an input file index to a Script_info.
std::vector<Script_info*> script_map_;
private:
// Edited output file object.
Output_file* output_;
};
template<int size, bool big_endian>
class Sized_relobj_incr;
template<int size, bool big_endian>
class Sized_incremental_binary : public Incremental_binary
{
public:
Sized_incremental_binary(Output_file* output,
const elfcpp::Ehdr<size, big_endian>& ehdr,
Target* target)
: Incremental_binary(output, target), elf_file_(this, ehdr),
input_objects_(), section_map_(), symbol_map_(), copy_relocs_(),
main_symtab_loc_(), main_strtab_loc_(), has_incremental_info_(false),
inputs_reader_(), symtab_reader_(), relocs_reader_(), got_plt_reader_(),
input_entry_readers_()
{ this->setup_readers(); }
// Returns TRUE if the file contains incremental info.
bool
has_incremental_info() const
{ return this->has_incremental_info_; }
// Record a pointer to the object for input file N.
void
set_input_object(unsigned int n,
Sized_relobj_incr<size, big_endian>* obj)
{ this->input_objects_[n] = obj; }
// Return a pointer to the object for input file N.
Sized_relobj_incr<size, big_endian>*
input_object(unsigned int n) const
{
gold_assert(n < this->input_objects_.size());
return this->input_objects_[n];
}
// Return the Output_section for section index SHNDX.
Output_section*
output_section(unsigned int shndx)
{ return this->section_map_[shndx]; }
// Map a symbol table entry from the base file to the output symbol table.
// SYMNDX is relative to the first forced-local or global symbol in the
// input file symbol table.
void
add_global_symbol(unsigned int symndx, Symbol* gsym)
{ this->symbol_map_[symndx] = gsym; }
// Map a symbol table entry from the base file to the output symbol table.
// SYMNDX is relative to the first forced-local or global symbol in the
// input file symbol table.
Symbol*
global_symbol(unsigned int symndx) const
{ return this->symbol_map_[symndx]; }
// Add a COPY relocation for a global symbol.
void
add_copy_reloc(Symbol* gsym, Output_section* os, off_t offset)
{ this->copy_relocs_.push_back(Copy_reloc(gsym, os, offset)); }
// Readers for the incremental info sections.
const Incremental_inputs_reader<size, big_endian>&
inputs_reader() const
{ return this->inputs_reader_; }
const Incremental_symtab_reader<big_endian>&
symtab_reader() const
{ return this->symtab_reader_; }
const Incremental_relocs_reader<size, big_endian>&
relocs_reader() const
{ return this->relocs_reader_; }
const Incremental_got_plt_reader<big_endian>&
got_plt_reader() const
{ return this->got_plt_reader_; }
void
get_symtab_view(View* symtab_view, unsigned int* sym_count,
elfcpp::Elf_strtab* strtab);
protected:
typedef Incremental_inputs_reader<size, big_endian> Inputs_reader;
typedef typename Inputs_reader::Incremental_input_entry_reader
Input_entry_reader;
virtual bool
do_check_inputs(const Command_line& cmdline,
Incremental_inputs* incremental_inputs);
// Return TRUE if input file N has changed since the last incremental link.
virtual bool
do_file_has_changed(unsigned int n) const;
// Initialize the layout of the output file based on the existing
// output file.
virtual void
do_init_layout(Layout* layout);
// Mark regions of the input file that must be kept unchanged.
virtual void
do_reserve_layout(unsigned int input_file_index);
// Process the GOT and PLT entries from the existing output file.
virtual void
do_process_got_plt(Symbol_table* symtab, Layout* layout);
// Emit COPY relocations from the existing output file.
virtual void
do_emit_copy_relocs(Symbol_table* symtab);
// Apply incremental relocations for symbols whose values have changed.
virtual void
do_apply_incremental_relocs(const Symbol_table* symtab, Layout* layout,
Output_file* of);
// Proxy class for a sized Incremental_input_entry_reader.
class Sized_input_reader : public Input_reader
{
public:
Sized_input_reader(Input_entry_reader r)
: Input_reader(), reader_(r)
{ }
virtual
~Sized_input_reader()
{ }
private:
const char*
do_filename() const
{ return this->reader_.filename(); }
Timespec
do_get_mtime() const
{ return this->reader_.get_mtime(); }
Incremental_input_type
do_type() const
{ return this->reader_.type(); }
unsigned int
do_arg_serial() const
{ return this->reader_.arg_serial(); }
unsigned int
do_get_unused_symbol_count() const
{ return this->reader_.get_unused_symbol_count(); }
const char*
do_get_unused_symbol(unsigned int n) const
{ return this->reader_.get_unused_symbol(n); }
Input_entry_reader reader_;
};
virtual unsigned int
do_input_file_count() const
{ return this->inputs_reader_.input_file_count(); }
virtual const Input_reader*
do_get_input_reader(unsigned int n) const
{
gold_assert(n < this->input_entry_readers_.size());
return &this->input_entry_readers_[n];
}
private:
// List of symbols that need COPY relocations.
struct Copy_reloc
{
Copy_reloc(Symbol* sym, Output_section* os, off_t off)
: symbol(sym), output_section(os), offset(off)
{ }
// The global symbol to copy.
Symbol* symbol;
// The output section into which the symbol was copied.
Output_section* output_section;
// The offset within that output section.
off_t offset;
};
typedef std::vector<Copy_reloc> Copy_relocs;
bool
find_incremental_inputs_sections(unsigned int* p_inputs_shndx,
unsigned int* p_symtab_shndx,
unsigned int* p_relocs_shndx,
unsigned int* p_got_plt_shndx,
unsigned int* p_strtab_shndx);
void
setup_readers();
// Output as an ELF file.
elfcpp::Elf_file<size, big_endian, Incremental_binary> elf_file_;
// Vector of pointers to the input objects for the unchanged files.
// For replaced files, the corresponding pointer is NULL.
std::vector<Sized_relobj_incr<size, big_endian>*> input_objects_;
// Map section index to an Output_section in the updated layout.
std::vector<Output_section*> section_map_;
// Map global symbols from the input file to the symbol table.
std::vector<Symbol*> symbol_map_;
// List of symbols that need COPY relocations.
Copy_relocs copy_relocs_;
// Locations of the main symbol table and symbol string table.
Location main_symtab_loc_;
Location main_strtab_loc_;
// Readers for the incremental info sections.
bool has_incremental_info_;
Incremental_inputs_reader<size, big_endian> inputs_reader_;
Incremental_symtab_reader<big_endian> symtab_reader_;
Incremental_relocs_reader<size, big_endian> relocs_reader_;
Incremental_got_plt_reader<big_endian> got_plt_reader_;
std::vector<Sized_input_reader> input_entry_readers_;
};
// An incremental Relobj. This class represents a relocatable object
// that has not changed since the last incremental link, and whose contents
// can be used directly from the base file.
template<int size, bool big_endian>
class Sized_relobj_incr : public Sized_relobj<size, big_endian>
{
public:
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
typedef typename Sized_relobj<size, big_endian>::Symbols Symbols;
Sized_relobj_incr(const std::string& name,
Sized_incremental_binary<size, big_endian>* ibase,
unsigned int input_file_index);
private:
// For convenience.
typedef Sized_relobj_incr<size, big_endian> This;
static const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
typedef typename Sized_relobj<size, big_endian>::Output_sections
Output_sections;
typedef Incremental_inputs_reader<size, big_endian> Inputs_reader;
typedef typename Inputs_reader::Incremental_input_entry_reader
Input_entry_reader;
// A local symbol.
struct Local_symbol
{
Local_symbol(const char* name_, Address value_, unsigned int size_,
unsigned int shndx_, unsigned int type_,
bool needs_dynsym_entry_)
: st_value(value_), name(name_), st_size(size_), st_shndx(shndx_),
st_type(type_), output_dynsym_index(0),
needs_dynsym_entry(needs_dynsym_entry_)
{ }
// The symbol value.
Address st_value;
// The symbol name. This points to the stringpool entry.
const char* name;
// The symbol size.
unsigned int st_size;
// The output section index.
unsigned int st_shndx : 28;
// The symbol type.
unsigned int st_type : 4;
// The index of the symbol in the output dynamic symbol table.
unsigned int output_dynsym_index : 31;
// TRUE if the symbol needs to appear in the dynamic symbol table.
unsigned int needs_dynsym_entry : 1;
};
// Return TRUE if this is an incremental (unchanged) input file.
bool
do_is_incremental() const
{ return true; }
// Return the last modified time of the file.
Timespec
do_get_mtime()
{ return this->input_reader_.get_mtime(); }
// Read the symbols.
void
do_read_symbols(Read_symbols_data*);
// Lay out the input sections.
void
do_layout(Symbol_table*, Layout*, Read_symbols_data*);
// Layout sections whose layout was deferred while waiting for
// input files from a plugin.
void
do_layout_deferred_sections(Layout*);
// Add the symbols to the symbol table.
void
do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*);
Archive::Should_include
do_should_include_member(Symbol_table* symtab, Layout*, Read_symbols_data*,
std::string* why);
// Iterate over global symbols, calling a visitor class V for each.
void
do_for_all_global_symbols(Read_symbols_data* sd,
Library_base::Symbol_visitor_base* v);
// Get the size of a section.
uint64_t
do_section_size(unsigned int shndx);
// Get the name of a section.
std::string
do_section_name(unsigned int shndx);
// Return a view of the contents of a section.
const unsigned char*
do_section_contents(unsigned int shndx, section_size_type* plen,
bool cache);
// Return section flags.
uint64_t
do_section_flags(unsigned int shndx);
// Return section entsize.
uint64_t
do_section_entsize(unsigned int shndx);
// Return section address.
uint64_t
do_section_address(unsigned int shndx);
// Return section type.
unsigned int
do_section_type(unsigned int shndx);
// Return the section link field.
unsigned int
do_section_link(unsigned int shndx);
// Return the section link field.
unsigned int
do_section_info(unsigned int shndx);
// Return the section alignment.
uint64_t
do_section_addralign(unsigned int shndx);
// Return the Xindex structure to use.
Xindex*
do_initialize_xindex();
// Get symbol counts.
void
do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const;
// Get global symbols.
const Symbols*
do_get_global_symbols() const
{ return &this->symbols_; }
// Return the value of a local symbol.
uint64_t
do_local_symbol_value(unsigned int, uint64_t) const
{ gold_unreachable(); }
unsigned int
do_local_plt_offset(unsigned int) const
{ gold_unreachable(); }
bool
do_local_is_tls(unsigned int) const
{ gold_unreachable(); }
// Return the number of local symbols.
unsigned int
do_local_symbol_count() const
{ return this->local_symbol_count_; }
// Return the number of local symbols in the output symbol table.
unsigned int
do_output_local_symbol_count() const
{ return this->local_symbol_count_; }
// Return the file offset for local symbols in the output symbol table.
off_t
do_local_symbol_offset() const
{ return this->local_symbol_offset_; }
// Read the relocs.
void
do_read_relocs(Read_relocs_data*);
// Process the relocs to find list of referenced sections. Used only
// during garbage collection.
void
do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*);
// Scan the relocs and adjust the symbol table.
void
do_scan_relocs(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, Symbol_table*);
// 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_relocate(const Symbol_table* symtab, const Layout*, Output_file* of);
// Set the offset of a section.
void
do_set_section_offset(unsigned int shndx, uint64_t off);
// The Incremental_binary base file.
Sized_incremental_binary<size, big_endian>* ibase_;
// The index of the object in the input file list.
unsigned int input_file_index_;
// The reader for the input file.
Input_entry_reader input_reader_;
// The number of local symbols.
unsigned int local_symbol_count_;
// The number of local symbols which go into the output file's dynamic
// symbol table.
unsigned int output_local_dynsym_count_;
// This starting symbol index in the output symbol table.
unsigned int local_symbol_index_;
// The file offset for local symbols in the output symbol table.
unsigned int local_symbol_offset_;
// The file offset for local symbols in the output symbol table.
unsigned int local_dynsym_offset_;
// The entries in the symbol table for the external symbols.
Symbols symbols_;
// Number of symbols defined in object file itself.
size_t defined_count_;
// The offset of the first incremental relocation for this object.
unsigned int incr_reloc_offset_;
// The number of incremental relocations for this object.
unsigned int incr_reloc_count_;
// The index of the first incremental relocation for this object in the
// updated output file.
unsigned int incr_reloc_output_index_;
// A copy of the incremental relocations from this object.
unsigned char* incr_relocs_;
// The local symbols.
std::vector<Local_symbol> local_symbols_;
};
// An incremental Dynobj. This class represents a shared object that has
// not changed since the last incremental link, and whose contents can be
// used directly from the base file.
template<int size, bool big_endian>
class Sized_incr_dynobj : public Dynobj
{
public:
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
static const Address invalid_address = static_cast<Address>(0) - 1;
Sized_incr_dynobj(const std::string& name,
Sized_incremental_binary<size, big_endian>* ibase,
unsigned int input_file_index);
private:
typedef Incremental_inputs_reader<size, big_endian> Inputs_reader;
typedef typename Inputs_reader::Incremental_input_entry_reader
Input_entry_reader;
// Return TRUE if this is an incremental (unchanged) input file.
bool
do_is_incremental() const
{ return true; }
// Return the last modified time of the file.
Timespec
do_get_mtime()
{ return this->input_reader_.get_mtime(); }
// Read the symbols.
void
do_read_symbols(Read_symbols_data*);
// Lay out the input sections.
void
do_layout(Symbol_table*, Layout*, Read_symbols_data*);
// Add the symbols to the symbol table.
void
do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*);
Archive::Should_include
do_should_include_member(Symbol_table* symtab, Layout*, Read_symbols_data*,
std::string* why);
// Iterate over global symbols, calling a visitor class V for each.
void
do_for_all_global_symbols(Read_symbols_data* sd,
Library_base::Symbol_visitor_base* v);
// Iterate over local symbols, calling a visitor class V for each GOT offset
// associated with a local symbol.
void
do_for_all_local_got_entries(Got_offset_list::Visitor* v) const;
// Get the size of a section.
uint64_t
do_section_size(unsigned int shndx);
// Get the name of a section.
std::string
do_section_name(unsigned int shndx);
// Return a view of the contents of a section.
const unsigned char*
do_section_contents(unsigned int shndx, section_size_type* plen,
bool cache);
// Return section flags.
uint64_t
do_section_flags(unsigned int shndx);
// Return section entsize.
uint64_t
do_section_entsize(unsigned int shndx);
// Return section address.
uint64_t
do_section_address(unsigned int shndx);
// Return section type.
unsigned int
do_section_type(unsigned int shndx);
// Return the section link field.
unsigned int
do_section_link(unsigned int shndx);
// Return the section link field.
unsigned int
do_section_info(unsigned int shndx);
// Return the section alignment.
uint64_t
do_section_addralign(unsigned int shndx);
// Return the Xindex structure to use.
Xindex*
do_initialize_xindex();
// Get symbol counts.
void
do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const;
// Get global symbols.
const Symbols*
do_get_global_symbols() const
{ return &this->symbols_; }
// The Incremental_binary base file.
Sized_incremental_binary<size, big_endian>* ibase_;
// The index of the object in the input file list.
unsigned int input_file_index_;
// The reader for the input file.
Input_entry_reader input_reader_;
// The entries in the symbol table for the external symbols.
Symbols symbols_;
// Number of symbols defined in object file itself.
size_t defined_count_;
};
// Allocate an incremental object of the appropriate size and endianness.
extern Object*
make_sized_incremental_object(
Incremental_binary* base,
unsigned int input_file_index,
Incremental_input_type input_type,
const Incremental_binary::Input_reader* input_reader);
// This class represents an Archive library (or --start-lib/--end-lib group)
// that has not changed since the last incremental link. Its contents come
// from the incremental inputs entry in the base file.
class Incremental_library : public Library_base
{
public:
Incremental_library(const char* filename, unsigned int input_file_index,
const Incremental_binary::Input_reader* input_reader)
: Library_base(NULL), filename_(filename),
input_file_index_(input_file_index), input_reader_(input_reader),
unused_symbols_(), is_reported_(false)
{ }
// Return the input file index.
unsigned int
input_file_index() const
{ return this->input_file_index_; }
// Return the serial number of the input file.
unsigned int
arg_serial() const
{ return this->input_reader_->arg_serial(); }
// Copy the unused symbols from the incremental input info.
// We need to do this because we may be overwriting the incremental
// input info in the base file before we write the new incremental
// info.
void
copy_unused_symbols();
// Return FALSE on the first call to indicate that the library needs
// to be recorded; return TRUE subsequently.
bool
is_reported()
{
bool was_reported = this->is_reported_;
is_reported_ = true;
return was_reported;
}
private:
typedef std::vector<std::string> Symbol_list;
// The file name.
const std::string&
do_filename() const
{ return this->filename_; }
// Return the modification time of the archive file.
Timespec
do_get_mtime()
{ return this->input_reader_->get_mtime(); }
// Iterator for unused global symbols in the library.
void
do_for_all_unused_symbols(Symbol_visitor_base* v) const;
// The name of the library.
std::string filename_;
// The input file index of this library.
unsigned int input_file_index_;
// A reader for the incremental input information.
const Incremental_binary::Input_reader* input_reader_;
// List of unused symbols defined in this library.
Symbol_list unused_symbols_;
// TRUE when this library has been reported to the new incremental info.
bool is_reported_;
};
} // End namespace gold.
#endif // !defined(GOLD_INCREMENTAL_H)
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