a2e4736229
(get_uncompressed_size): New function. (decompress_input_section): New function. * compressed_output.h (get_uncompressed_size): New function. (decompress_input_section): New function. * dwarf_reader.cc (Sized_dwarf_line_info::Sized_dwarf_line_info) Handle compressed debug sections. * layout.cc (is_compressed_debug_section): New function. (Layout::output_section_name): Map compressed section names to canonical names. * layout.h (is_compressed_debug_section): New function. (is_debug_info_section): Recognize compressed debug sections. * merge.cc: Include compressed_output.h. (Output_merge_data::do_add_input_section): Handle compressed debug sections. (Output_merge_string::do_add_input_section): Handle compressed debug sections. * object.cc: Include compressed_output.h. (Sized_relobj::Sized_relobj): Initialize new data members. (build_compressed_section_map): New function. (Sized_relobj::do_read_symbols): Handle compressed debug sections. * object.h (Object::section_is_compressed): New method. (Object::do_section_is_compressed): New method. (Sized_relobj::Compressed_section_map): New type. (Sized_relobj::do_section_is_compressed): New method. (Sized_relobj::compressed_sections_): New data member. * output.cc (Output_section::add_input_section): Handle compressed debug sections. * reloc.cc: Include compressed_output.h. (Sized_relobj::write_sections): Handle compressed debug sections.
86 lines
2.5 KiB
C++
86 lines
2.5 KiB
C++
// compressed_output.h -- compressed output sections for gold -*- C++ -*-
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// Copyright 2007, 2008, 2010 Free Software Foundation, Inc.
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// Written by Ian Lance Taylor <iant@google.com>.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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// We support compressing .debug_* sections on output. (And,
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// potentially one day, other sections.) This is a form of
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// relaxation. This file adds support for merging and emitting the
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// compressed sections.
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#ifndef GOLD_COMPRESSED_OUTPUT_H
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#define GOLD_COMPRESSED_OUTPUT_H
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#include <string>
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#include "output.h"
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namespace gold
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{
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class General_options;
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// Read the compression header of a compressed debug section and return
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// the uncompressed size.
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extern uint64_t
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get_uncompressed_size(const unsigned char*, section_size_type);
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// Decompress a compressed debug section directly into the output file.
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extern bool
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decompress_input_section(const unsigned char*, unsigned long, unsigned char*,
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unsigned long);
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// This is used for a section whose data should be compressed. It is
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// a regular Output_section which computes its contents into a buffer
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// and then postprocesses it.
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class Output_compressed_section : public Output_section
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{
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public:
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Output_compressed_section(const General_options* options,
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const char* name, elfcpp::Elf_Word flags,
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elfcpp::Elf_Xword type)
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: Output_section(name, flags, type),
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options_(options)
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{ this->set_requires_postprocessing(); }
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protected:
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// Set the final data size.
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void
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set_final_data_size();
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// Write out the compressed contents.
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void
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do_write(Output_file*);
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private:
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// The options--this includes the compression type.
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const General_options* options_;
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// The compressed data.
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unsigned char* data_;
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// The new section name if we do compress.
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std::string new_section_name_;
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};
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} // End namespace gold.
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#endif // !defined(GOLD_COMPRESSED_OUTPUT_H)
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