175fd0b74Schristos // compressed_output.h -- compressed output sections for gold -*- C++ -*- 275fd0b74Schristos 3*e992f068Schristos // Copyright (C) 2007-2022 Free Software Foundation, Inc. 475fd0b74Schristos // Written by Ian Lance Taylor <iant@google.com>. 575fd0b74Schristos 675fd0b74Schristos // This file is part of gold. 775fd0b74Schristos 875fd0b74Schristos // This program is free software; you can redistribute it and/or modify 975fd0b74Schristos // it under the terms of the GNU General Public License as published by 1075fd0b74Schristos // the Free Software Foundation; either version 3 of the License, or 1175fd0b74Schristos // (at your option) any later version. 1275fd0b74Schristos 1375fd0b74Schristos // This program is distributed in the hope that it will be useful, 1475fd0b74Schristos // but WITHOUT ANY WARRANTY; without even the implied warranty of 1575fd0b74Schristos // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1675fd0b74Schristos // GNU General Public License for more details. 1775fd0b74Schristos 1875fd0b74Schristos // You should have received a copy of the GNU General Public License 1975fd0b74Schristos // along with this program; if not, write to the Free Software 2075fd0b74Schristos // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 2175fd0b74Schristos // MA 02110-1301, USA. 2275fd0b74Schristos 2375fd0b74Schristos // We support compressing .debug_* sections on output. (And, 2475fd0b74Schristos // potentially one day, other sections.) This is a form of 2575fd0b74Schristos // relaxation. This file adds support for merging and emitting the 2675fd0b74Schristos // compressed sections. 2775fd0b74Schristos 2875fd0b74Schristos #ifndef GOLD_COMPRESSED_OUTPUT_H 2975fd0b74Schristos #define GOLD_COMPRESSED_OUTPUT_H 3075fd0b74Schristos 3175fd0b74Schristos #include <string> 3275fd0b74Schristos 3375fd0b74Schristos #include "output.h" 3475fd0b74Schristos 3575fd0b74Schristos namespace gold 3675fd0b74Schristos { 3775fd0b74Schristos 3875fd0b74Schristos class General_options; 3975fd0b74Schristos 4075fd0b74Schristos // Read the compression header of a compressed debug section and return 4175fd0b74Schristos // the uncompressed size. 4275fd0b74Schristos 4375fd0b74Schristos extern uint64_t 4475fd0b74Schristos get_uncompressed_size(const unsigned char*, section_size_type); 4575fd0b74Schristos 4675fd0b74Schristos // Decompress a compressed debug section directly into the output file. 4775fd0b74Schristos 4875fd0b74Schristos extern bool 4975fd0b74Schristos decompress_input_section(const unsigned char*, unsigned long, unsigned char*, 5075fd0b74Schristos unsigned long, int, bool, elfcpp::Elf_Xword); 5175fd0b74Schristos 5275fd0b74Schristos // This is used for a section whose data should be compressed. It is 5375fd0b74Schristos // a regular Output_section which computes its contents into a buffer 5475fd0b74Schristos // and then postprocesses it. 5575fd0b74Schristos 5675fd0b74Schristos class Output_compressed_section : public Output_section 5775fd0b74Schristos { 5875fd0b74Schristos public: Output_compressed_section(const General_options * options,const char * name,elfcpp::Elf_Word flags,elfcpp::Elf_Xword type)5975fd0b74Schristos Output_compressed_section(const General_options* options, 6075fd0b74Schristos const char* name, elfcpp::Elf_Word flags, 6175fd0b74Schristos elfcpp::Elf_Xword type) 6275fd0b74Schristos : Output_section(name, flags, type), 6375fd0b74Schristos options_(options) 6475fd0b74Schristos { this->set_requires_postprocessing(); } 6575fd0b74Schristos 6675fd0b74Schristos protected: 6775fd0b74Schristos // Set the final data size. 6875fd0b74Schristos void 6975fd0b74Schristos set_final_data_size(); 7075fd0b74Schristos 7175fd0b74Schristos // Write out the compressed contents. 7275fd0b74Schristos void 7375fd0b74Schristos do_write(Output_file*); 7475fd0b74Schristos 7575fd0b74Schristos private: 7675fd0b74Schristos // The options--this includes the compression type. 7775fd0b74Schristos const General_options* options_; 7875fd0b74Schristos // The compressed data. 7975fd0b74Schristos unsigned char* data_; 8075fd0b74Schristos // The new section name if we do compress. 8175fd0b74Schristos std::string new_section_name_; 8275fd0b74Schristos }; 8375fd0b74Schristos 8475fd0b74Schristos } // End namespace gold. 8575fd0b74Schristos 8675fd0b74Schristos #endif // !defined(GOLD_COMPRESSED_OUTPUT_H) 87