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// reduced_debug_output.h -- reduce debugging information  -*- C++ -*-

// Copyright 2008 Free Software Foundation, Inc.

// Written by Caleb Howe <cshowe@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.

// Reduce the size of the debug sections by emitting only debug line number

// information.  We still need to emit skeleton debug_info and debug_abbrev

// sections for standard tools to parse the debug information correctly.  These

// classes remove all debug information entries from the .debug_info section

// except for those describing compilation units as these DIEs contain

// references to the debug line information needed by most parsers.

#ifndef GOLD_REDUCED_DEBUG_OUTPUT_H

#define GOLD_REDUCED_DEBUG_OUTPUT_H

#include <map>

#include <utility>

#include <vector>

#include "output.h"

namespace gold

{

class Output_reduced_debug_abbrev_section : public Output_section

{

 public:

  Output_reduced_debug_abbrev_section(const char* name, elfcpp::Elf_Word flags,

                                      elfcpp::Elf_Xword type)

    : Output_section(name, flags, type), sized_(false),

      abbrev_count_(0), failed_(false)

  { this->set_requires_postprocessing(); }

  unsigned char* get_new_abbrev(uint64_t* abbrev_number,

                                uint64_t abbrev_offset);

 protected:

  // Set the final data size.

  void

  set_final_data_size();

  // Write out the new debug abbreviations

  void

  do_write(Output_file*);

 private:

  void

  failed(std::string reason)

  {

    gold_warning(reason.c_str());

    failed_ = true;

  }

  // The reduced debug abbreviations

  std::vector<unsigned char> data_;

  // We map the abbreviation table offset and abbreviation number of the

  // old abbreviation to the number and size of the new abbreviation.

  std::map<std::pair<uint64_t, uint64_t>,

           std::pair<uint64_t, uint64_t> > abbrev_mapping_;

  bool sized_;

  // The count of abbreviations in the output data

  int abbrev_count_;

  // Whether or not the debug reduction has failed for any reason

  bool failed_;

};

class Output_reduced_debug_info_section : public Output_section

{

 public:

  Output_reduced_debug_info_section(const char* name, elfcpp::Elf_Word flags,

                                    elfcpp::Elf_Xword type)

    : Output_section(name, flags, type), failed_(false)

  { this->set_requires_postprocessing(); }

  void

  set_abbreviations(Output_reduced_debug_abbrev_section* abbrevs)

  { associated_abbrev_ = abbrevs; }

 protected:

  // Set the final data size.

  void

  set_final_data_size();

  // Write out the new debug info

  void

  do_write(Output_file*);

 private:

  void

  failed(std::string reason)

  {

    gold_warning(reason.c_str());

    this->failed_ = true;

  }

  // Given a pointer to the beginning of a die and the beginning of the

  // associated abbreviation fills in die_end with the end of the information

  // entry.  If successful returns true.  Get_die_end also takes a pointer to

  // the end of the buffer containing the die. If die_end would be beyond the

  // end of the buffer, or if an unsupported dwarf form is encountered returns

  // false.

  bool

  get_die_end(unsigned char* die, unsigned char* abbrev,

              unsigned char** die_end, unsigned char* buffer_end,

              int address_size, bool is64);

  // The reduced debug info

  std::vector<unsigned char> data_;

  // Each debug info section needs to be associated with a debug abbrev section

  Output_reduced_debug_abbrev_section* associated_abbrev_;

  // Whether or not the debug reduction has failed for any reason

  bool failed_;

};

} // End namespace gold.

#endif // !defined(GOLD_REDUCED_DEBUG_OUTPUT_H)