| // compressed_output.h -- compressed output sections for gold -*- C++ -*- |
| |
| // Copyright (C) 2007-2024 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) |