1*a9fa9459Szrj // compressed_output.h -- compressed output sections for gold -*- C++ -*- 2*a9fa9459Szrj 3*a9fa9459Szrj // Copyright (C) 2007-2016 Free Software Foundation, Inc. 4*a9fa9459Szrj // Written by Ian Lance Taylor <iant@google.com>. 5*a9fa9459Szrj 6*a9fa9459Szrj // This file is part of gold. 7*a9fa9459Szrj 8*a9fa9459Szrj // This program is free software; you can redistribute it and/or modify 9*a9fa9459Szrj // it under the terms of the GNU General Public License as published by 10*a9fa9459Szrj // the Free Software Foundation; either version 3 of the License, or 11*a9fa9459Szrj // (at your option) any later version. 12*a9fa9459Szrj 13*a9fa9459Szrj // This program is distributed in the hope that it will be useful, 14*a9fa9459Szrj // but WITHOUT ANY WARRANTY; without even the implied warranty of 15*a9fa9459Szrj // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16*a9fa9459Szrj // GNU General Public License for more details. 17*a9fa9459Szrj 18*a9fa9459Szrj // You should have received a copy of the GNU General Public License 19*a9fa9459Szrj // along with this program; if not, write to the Free Software 20*a9fa9459Szrj // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 21*a9fa9459Szrj // MA 02110-1301, USA. 22*a9fa9459Szrj 23*a9fa9459Szrj // We support compressing .debug_* sections on output. (And, 24*a9fa9459Szrj // potentially one day, other sections.) This is a form of 25*a9fa9459Szrj // relaxation. This file adds support for merging and emitting the 26*a9fa9459Szrj // compressed sections. 27*a9fa9459Szrj 28*a9fa9459Szrj #ifndef GOLD_COMPRESSED_OUTPUT_H 29*a9fa9459Szrj #define GOLD_COMPRESSED_OUTPUT_H 30*a9fa9459Szrj 31*a9fa9459Szrj #include <string> 32*a9fa9459Szrj 33*a9fa9459Szrj #include "output.h" 34*a9fa9459Szrj 35*a9fa9459Szrj namespace gold 36*a9fa9459Szrj { 37*a9fa9459Szrj 38*a9fa9459Szrj class General_options; 39*a9fa9459Szrj 40*a9fa9459Szrj // Read the compression header of a compressed debug section and return 41*a9fa9459Szrj // the uncompressed size. 42*a9fa9459Szrj 43*a9fa9459Szrj extern uint64_t 44*a9fa9459Szrj get_uncompressed_size(const unsigned char*, section_size_type); 45*a9fa9459Szrj 46*a9fa9459Szrj // Decompress a compressed debug section directly into the output file. 47*a9fa9459Szrj 48*a9fa9459Szrj extern bool 49*a9fa9459Szrj decompress_input_section(const unsigned char*, unsigned long, unsigned char*, 50*a9fa9459Szrj unsigned long, int, bool, elfcpp::Elf_Xword); 51*a9fa9459Szrj 52*a9fa9459Szrj // This is used for a section whose data should be compressed. It is 53*a9fa9459Szrj // a regular Output_section which computes its contents into a buffer 54*a9fa9459Szrj // and then postprocesses it. 55*a9fa9459Szrj 56*a9fa9459Szrj class Output_compressed_section : public Output_section 57*a9fa9459Szrj { 58*a9fa9459Szrj public: Output_compressed_section(const General_options * options,const char * name,elfcpp::Elf_Word flags,elfcpp::Elf_Xword type)59*a9fa9459Szrj Output_compressed_section(const General_options* options, 60*a9fa9459Szrj const char* name, elfcpp::Elf_Word flags, 61*a9fa9459Szrj elfcpp::Elf_Xword type) 62*a9fa9459Szrj : Output_section(name, flags, type), 63*a9fa9459Szrj options_(options) 64*a9fa9459Szrj { this->set_requires_postprocessing(); } 65*a9fa9459Szrj 66*a9fa9459Szrj protected: 67*a9fa9459Szrj // Set the final data size. 68*a9fa9459Szrj void 69*a9fa9459Szrj set_final_data_size(); 70*a9fa9459Szrj 71*a9fa9459Szrj // Write out the compressed contents. 72*a9fa9459Szrj void 73*a9fa9459Szrj do_write(Output_file*); 74*a9fa9459Szrj 75*a9fa9459Szrj private: 76*a9fa9459Szrj // The options--this includes the compression type. 77*a9fa9459Szrj const General_options* options_; 78*a9fa9459Szrj // The compressed data. 79*a9fa9459Szrj unsigned char* data_; 80*a9fa9459Szrj // The new section name if we do compress. 81*a9fa9459Szrj std::string new_section_name_; 82*a9fa9459Szrj }; 83*a9fa9459Szrj 84*a9fa9459Szrj } // End namespace gold. 85*a9fa9459Szrj 86*a9fa9459Szrj #endif // !defined(GOLD_COMPRESSED_OUTPUT_H) 87