binutils-gdb/gold/compressed_output.h

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// compressed_output.h -- compressed output sections for gold -*- C++ -*-
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// Copyright (C) 2007-2016 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*,
Add SHF_COMPRESSED section decompression to gold This patch adds SHF_COMPRESSED section decompression to gold. PR gold/18321 * compressed_output.h (decompress_input_section): Add arguments for ELF class, big endian and sh_flags. * compressed_output.cc (decompress_input_section): Likewise. Support the SHF_COMPRESSED section. * dynobj.h (Dynobj): Add elfsize and is_big_endian member functions. * plugin.h (Pluginobj): Likewise. * layout.cc (Layout::get_output_section_flags): Also clear the SHF_COMPRESSED bit. * object.h (Compressed_section_info): Add flag to store sh_flags. (Object): Add pure virtual elfsize and is_big_endian member functions. * object.cc (need_decompressed_section): Don't skip the ".zdebug" prefix here. (build_compressed_section_map): Check SHF_COMPRESSED for uncompressed size. Store sh_flags in Compressed_section_info. Pass size, big_endian and sh_flags to decompress_input_section. Skip the ".debug"/".zdebug" prefix when passing section name to need_decompressed_section. (Sized_relobj_file<size, big_endian>::do_find_special_section): Don't check ".zdebug_*" sections. (Object::decompressed_section_contents): Pass ELF class, big endian and sh_flags to decompress_input_section. * reloc.cc (Sized_relobj_file<size, big_endian>::write_sections): Likewise. * testsuite/Makefile.am (check_DATA): Add debug_msg_cdebug_gabi.err and gdb_index_test_2_gabi.stdout. (MOSTLYCLEANFILES): Add debug_msg_cdebug_gabi.err and gdb_index_test_2_gabi.stdout. (debug_msg_cdebug_gabi.o): New. (odr_violation1_cdebug_gabi.o): Likewise. (odr_violation2_cdebug_gabi.o): Likewise. (debug_msg_cdebug_gabi.err): Likewise. (check_SCRIPTS): Add gdb_index_test_2_gabi.sh. (gdb_index_test_cdebug_gabi.o): Likewise. (gdb_index_test_2_gabi): Likewise. (gdb_index_test_2_gabi.stdout): Likewise. * testsuite/gdb_index_test_2_gabi.sh: New file. * testsuite/Makefile.in: Regenerated.
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unsigned long, int, bool, elfcpp::Elf_Xword);
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// 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.
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class Output_compressed_section : public Output_section
{
public:
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Output_compressed_section(const General_options* options,
const char* name, elfcpp::Elf_Word flags,
elfcpp::Elf_Xword type)
: Output_section(name, flags, type),
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options_(options)
{ this->set_requires_postprocessing(); }
protected:
// Set the final data size.
void
set_final_data_size();
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// Write out the compressed contents.
void
do_write(Output_file*);
private:
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// The options--this includes the compression type.
const General_options* options_;
// The compressed data.
unsigned char* data_;
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// The new section name if we do compress.
std::string new_section_name_;
};
} // End namespace gold.
#endif // !defined(GOLD_COMPRESSED_OUTPUT_H)