old-cross-binutils/gold/incremental.h
Ralf Wildenhues 9b547ce683 Fix typos in gold.
gold/:
	* dwarf_reader.cc: Remove outdated comment.
	* gold-threads.cc: Fix typo in error message.
	* archive.cc: Fix typos in comments.
	* archive.h: Likewise.
	* arm-reloc-property.cc: Likewise.
	* arm-reloc-property.h: Likewise.
	* arm-reloc.def: Likewise.
	* arm.cc: Likewise.
	* attributes.h: Likewise.
	* cref.cc: Likewise.
	* ehframe.cc: Likewise.
	* fileread.h: Likewise.
	* gold.h: Likewise.
	* i386.cc: Likewise.
	* icf.cc: Likewise.
	* incremental.h: Likewise.
	* int_encoding.cc: Likewise.
	* layout.h: Likewise.
	* main.cc: Likewise.
	* merge.h: Likewise.
	* object.cc: Likewise.
	* object.h: Likewise.
	* options.cc: Likewise.
	* readsyms.cc: Likewise.
	* reduced_debug_output.cc: Likewise.
	* reloc.cc: Likewise.
	* script-sections.cc: Likewise.
	* sparc.cc: Likewise.
	* symtab.h: Likewise.
	* target-reloc.h: Likewise.
	* target.cc: Likewise.
	* target.h: Likewise.
	* timer.cc: Likewise.
	* timer.h: Likewise.
	* x86_64.cc: Likewise.
2010-12-14 19:03:30 +00:00

1030 lines
28 KiB
C++

// inremental.h -- incremental linking support for gold -*- C++ -*-
// Copyright 2009, 2010 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"
namespace gold
{
class Archive;
class Input_argument;
class Incremental_inputs_checker;
class Incremental_script_entry;
class Incremental_object_entry;
class Incremental_archive_entry;
class Incremental_inputs;
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
};
// An object representing the ELF file we edit during an incremental build.
// Similar to Object or Dynobj, but operates on Output_file and contains
// method specific to file edition (TBD). 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)
: output_(output), target_(target)
{ }
virtual
~Incremental_binary()
{ }
// 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)); }
// Report an error.
void
error(const char* format, ...) const ATTRIBUTE_PRINTF_2;
// Find the .gnu_incremental_inputs and related sections. It selects the
// first section of type SHT_GNU_INCREMENTAL_INPUTS,
// SHT_GNU_INCREMENTAL_SYMTAB, and SHT_GNU_INCREMENTAL_RELOCS.
// Returns false if the sections are not found.
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)
{
return do_find_incremental_inputs_sections(p_inputs_shndx, p_symtab_shndx,
p_relocs_shndx, p_got_plt_shndx,
p_strtab_shndx);
}
// Check the .gnu_incremental_inputs section to see whether an incremental
// build is possible.
// TODO: on success, should report what files needs to be rebuilt.
// INCREMENTAL_INPUTS is used to read the canonical form of the command line
// and read the input arguments. TODO: for items that don't need to be
// rebuilt, we should also copy the incremental input information.
virtual bool
check_inputs(Incremental_inputs* incremental_inputs)
{ return do_check_inputs(incremental_inputs); }
protected:
// Find incremental inputs section.
virtual bool
do_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) = 0;
// Check the .gnu_incremental_inputs section to see whether an incremental
// build is possible.
virtual bool
do_check_inputs(Incremental_inputs* incremental_inputs) = 0;
private:
// Edited output file object.
Output_file* output_;
// Target of the output file.
Target* target_;
};
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)
{ }
protected:
virtual bool
do_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);
virtual bool
do_check_inputs(Incremental_inputs* incremental_inputs);
private:
// Output as an ELF file.
elfcpp::Elf_file<size, big_endian, Incremental_binary> elf_file_;
};
// 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);
// Code invoked early during an incremental link that checks what files need
// to be relinked.
class Incremental_checker
{
public:
// Check if the file named OUTPUT_NAME can be linked incrementally.
// INCREMENTAL_INPUTS must have the canonical form of the command line
// and input arguments filled - at this point of linking other fields are
// probably not filled yet. TODO: for inputs that don't need to be
// rebuilt, this function should fill the incremental input information.
Incremental_checker(const char* output_name,
Incremental_inputs* incremental_inputs)
: output_name_(output_name), incremental_inputs_(incremental_inputs)
{ }
// Analyzes the output file to check if incremental linking is possible and
// what files needs to be relinked.
bool
can_incrementally_link_output_file();
private:
// Name of the output file to analyze.
const char* output_name_;
// The Incremental_inputs object. At this stage of link, only the command
// line and inputs are filled.
Incremental_inputs* incremental_inputs_;
};
// Base class for recording each input file.
class Incremental_input_entry
{
public:
Incremental_input_entry(Stringpool::Key filename_key, Timespec mtime)
: filename_key_(filename_key), offset_(0), info_offset_(0), mtime_(mtime)
{ }
virtual
~Incremental_input_entry()
{ }
// Return the type of input file.
Incremental_input_type
type() const
{ return this->do_type(); }
// Set the section offset of this input file entry.
void
set_offset(unsigned int offset)
{ 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 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 modification time of the input file.
const Timespec&
get_mtime() const
{ return this->mtime_; }
// 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_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_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_;
// Offset of the entry in the output section.
unsigned int offset_;
// Offset of the extra information in the output section.
unsigned int info_offset_;
// Last modification time of the file.
Timespec mtime_;
};
// Class for recording input scripts.
class Incremental_script_entry : public Incremental_input_entry
{
public:
Incremental_script_entry(Stringpool::Key filename_key, Script_info* script,
Timespec mtime)
: Incremental_input_entry(filename_key, mtime), script_(script)
{ }
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:
// Information about the script file.
Script_info* script_;
};
// Class for recording input object files.
class Incremental_object_entry : public Incremental_input_entry
{
public:
Incremental_object_entry(Stringpool::Key filename_key, Object* obj,
Timespec mtime)
: Incremental_input_entry(filename_key, mtime), obj_(obj),
is_member_(false), sections_()
{
if (!obj_->is_dynamic())
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)
{
if (shndx >= this->sections_.size())
this->sections_.resize(shndx + 1);
this->sections_[shndx].name_key = name_key;
this->sections_[shndx].sh_size = sh_size;
}
// Return the number of input sections in this object.
unsigned int
get_input_section_count() const
{ return this->sections_.size(); }
// 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; }
protected:
virtual Incremental_input_type
do_type() const
{
return (this->is_member_
? INCREMENTAL_INPUT_ARCHIVE_MEMBER
: (this->obj_->is_dynamic()
? INCREMENTAL_INPUT_SHARED_LIBRARY
: 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
{
Stringpool::Key name_key;
off_t sh_size;
};
std::vector<Input_section> sections_;
};
// Class for recording archive library input files.
class Incremental_archive_entry : public Incremental_input_entry
{
public:
Incremental_archive_entry(Stringpool::Key filename_key, Archive*,
Timespec mtime)
: Incremental_input_entry(filename_key, 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(Archive* arch);
// Record the final info for archive file ARCHIVE.
void
report_archive_end(Archive* 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, Archive* arch);
// 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 the info for input script SCRIPT.
void
report_script(const std::string& filename, Script_info* script,
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 .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:
Incremental_inputs_reader(const unsigned char* p, 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
{
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);
int type = Swap16::readval(this->inputs_->p_ + offset + 20);
this->type_ = static_cast<Incremental_input_type>(type);
}
// 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 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 this->type_; }
// 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 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_ + 8
+ section_count * input_section_entry_size
+ symndx * 16);
}
// Return the global symbol count -- for objects & shared libraries only.
unsigned int
get_global_symbol_count() const
{
switch (this->type_)
{
case INCREMENTAL_INPUT_OBJECT:
case INCREMENTAL_INPUT_ARCHIVE_MEMBER:
return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 4);
case INCREMENTAL_INPUT_SHARED_LIBRARY:
return Swap32::readval(this->inputs_->p_ + this->info_offset_);
default:
gold_unreachable();
}
}
// 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_ + 8
+ n * 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;
}
// Information about a global symbol.
struct Global_symbol_info
{
unsigned int output_symndx;
unsigned int next_offset;
unsigned int reloc_count;
unsigned int reloc_offset;
};
// Return info about the Nth global symbol -- for objects only.
Global_symbol_info
get_global_symbol_info(unsigned int n) const
{
Global_symbol_info info;
unsigned int section_count = this->get_input_section_count();
const unsigned char* p = (this->inputs_->p_
+ this->info_offset_ + 8
+ section_count * input_section_entry_size
+ n * 16);
info.output_symndx = Swap32::readval(p);
info.next_offset = Swap32::readval(p + 4);
info.reloc_count = Swap::readval(p + 8);
info.reloc_offset = Swap::readval(p + 12);
return info;
}
private:
// Size of an input section entry.
static const unsigned int input_section_entry_size = 8 + 2 * size / 8;
// The reader instance for the containing section.
const Incremental_inputs_reader* inputs_;
// The type of input file.
Incremental_input_type type_;
// 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 a reader for the Nth input file entry.
Incremental_input_entry_reader
input_file(unsigned int n) const
{
gold_assert(n < this->input_file_count_);
Incremental_input_entry_reader input(this, 16 + n * 24);
return input;
}
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(const unsigned char* p) : p_(p)
{ }
// 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_;
};
// 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(const unsigned char* p) : p_(p)
{ }
// 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);
}
private:
// Base address of the .gnu_incremental_relocs section.
const unsigned char* p_;
};
// Reader class for the .gnu_incremental_got_plt section.
template<bool big_endian>
class Incremental_got_plt_reader
{
public:
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_ * 4;
}
// 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 GOT descriptor for GOT entry N.
unsigned int
get_got_desc(unsigned int n)
{
return elfcpp::Swap<32, big_endian>::readval(this->got_desc_p_ + n * 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_;
};
} // End namespace gold.
#endif // !defined(GOLD_INCREMENTAL_H)