1 // compressed_output.h -- compressed output sections for gold -*- C++ -*- 2 3 // Copyright 2007, 2008 Free Software Foundation, Inc. 4 // Written by Ian Lance Taylor <iant@google.com>. 5 6 // This file is part of gold. 7 8 // This program is free software; you can redistribute it and/or modify 9 // it under the terms of the GNU General Public License as published by 10 // the Free Software Foundation; either version 3 of the License, or 11 // (at your option) any later version. 12 13 // This program is distributed in the hope that it will be useful, 14 // but WITHOUT ANY WARRANTY; without even the implied warranty of 15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 // GNU General Public License for more details. 17 18 // You should have received a copy of the GNU General Public License 19 // along with this program; if not, write to the Free Software 20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 21 // MA 02110-1301, USA. 22 23 // We support compressing .debug_* sections on output. (And, 24 // potentially one day, other sections.) This is a form of 25 // relaxation. This file adds support for merging and emitting the 26 // compressed sections. 27 28 #ifndef GOLD_COMPRESSED_OUTPUT_H 29 #define GOLD_COMPRESSED_OUTPUT_H 30 31 #include <string> 32 33 #include "output.h" 34 35 namespace gold 36 { 37 38 class General_options; 39 40 // This is used for a section whose data should be compressed. It is 41 // a regular Output_section which computes its contents into a buffer 42 // and then postprocesses it. 43 44 class Output_compressed_section : public Output_section 45 { 46 public: 47 Output_compressed_section(const General_options* options, 48 const char* name, elfcpp::Elf_Word flags, 49 elfcpp::Elf_Xword type) 50 : Output_section(name, flags, type), 51 options_(options) 52 { this->set_requires_postprocessing(); } 53 54 protected: 55 // Set the final data size. 56 void 57 set_final_data_size(); 58 59 // Write out the compressed contents. 60 void 61 do_write(Output_file*); 62 63 private: 64 // The options--this includes the compression type. 65 const General_options* options_; 66 // The compressed data. 67 unsigned char* data_; 68 // The new section name if we do compress. 69 std::string new_section_name_; 70 }; 71 72 } // End namespace gold. 73 74 #endif // !defined(GOLD_COMPRESSED_OUTPUT_H) 75