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// compressed_output.h -- compressed output sections for gold -*- C++ -*-
// Copyright (C) 2007-2021 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
// MA 02110-1301, USA.
// We support compressing .debug_* sections on output. (And,
// potentially one day, other sections.) This is a form of
// relaxation. This file adds support for merging and emitting the
// compressed sections.
#ifndef GOLD_COMPRESSED_OUTPUT_H
#define GOLD_COMPRESSED_OUTPUT_H
#include <string>
#include "output.h"
namespace gold
{
class General_options;
// Read the compression header of a compressed debug section and return
// the uncompressed size.
extern uint64_t
get_uncompressed_size(const unsigned char*, section_size_type);
// Decompress a compressed debug section directly into the output file.
extern bool
decompress_input_section(const unsigned char*, unsigned long, unsigned char*,
unsigned long, int, bool, elfcpp::Elf_Xword);
// This is used for a section whose data should be compressed. It is
// a regular Output_section which computes its contents into a buffer
// and then postprocesses it.
class Output_compressed_section : public Output_section
{
public:
Output_compressed_section(const General_options* options,
const char* name, elfcpp::Elf_Word flags,
elfcpp::Elf_Xword type)
: Output_section(name, flags, type),
options_(options)
{ this->set_requires_postprocessing(); }
protected:
// Set the final data size.
void
set_final_data_size();
// Write out the compressed contents.
void
do_write(Output_file*);
private:
// The options--this includes the compression type.
const General_options* options_;
// The compressed data.
unsigned char* data_;
// The new section name if we do compress.
std::string new_section_name_;
};
} // End namespace gold.
#endif // !defined(GOLD_COMPRESSED_OUTPUT_H)
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