| // reduced_debug_output.h -- reduce debugging information -*- C++ -*- |
| |
| // Copyright (C) 2008-2021 Free Software Foundation, Inc. |
| // Written by Caleb Howe <cshowe@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. |
| |
| // Reduce the size of the debug sections by emitting only debug line number |
| // information. We still need to emit skeleton debug_info and debug_abbrev |
| // sections for standard tools to parse the debug information correctly. These |
| // classes remove all debug information entries from the .debug_info section |
| // except for those describing compilation units as these DIEs contain |
| // references to the debug line information needed by most parsers. |
| |
| #ifndef GOLD_REDUCED_DEBUG_OUTPUT_H |
| #define GOLD_REDUCED_DEBUG_OUTPUT_H |
| |
| #include <map> |
| #include <utility> |
| #include <vector> |
| |
| #include "output.h" |
| |
| namespace gold |
| { |
| |
| class Output_reduced_debug_abbrev_section : public Output_section |
| { |
| public: |
| Output_reduced_debug_abbrev_section(const char* name, elfcpp::Elf_Word flags, |
| elfcpp::Elf_Xword type) |
| : Output_section(name, flags, type), sized_(false), |
| abbrev_count_(0), failed_(false) |
| { this->set_requires_postprocessing(); } |
| |
| unsigned char* get_new_abbrev(uint64_t* abbrev_number, |
| uint64_t abbrev_offset); |
| |
| protected: |
| // Set the final data size. |
| void |
| set_final_data_size(); |
| |
| // Write out the new debug abbreviations |
| void |
| do_write(Output_file*); |
| |
| private: |
| void |
| failed(std::string reason) |
| { |
| gold_warning("%s", reason.c_str()); |
| failed_ = true; |
| } |
| |
| // The reduced debug abbreviations |
| std::vector<unsigned char> data_; |
| |
| // We map the abbreviation table offset and abbreviation number of the |
| // old abbreviation to the number and size of the new abbreviation. |
| std::map<std::pair<uint64_t, uint64_t>, |
| std::pair<uint64_t, uint64_t> > abbrev_mapping_; |
| |
| bool sized_; |
| |
| // The count of abbreviations in the output data |
| int abbrev_count_; |
| |
| // Whether or not the debug reduction has failed for any reason |
| bool failed_; |
| }; |
| |
| class Output_reduced_debug_info_section : public Output_section |
| { |
| public: |
| Output_reduced_debug_info_section(const char* name, elfcpp::Elf_Word flags, |
| elfcpp::Elf_Xword type) |
| : Output_section(name, flags, type), failed_(false) |
| { this->set_requires_postprocessing(); } |
| |
| void |
| set_abbreviations(Output_reduced_debug_abbrev_section* abbrevs) |
| { associated_abbrev_ = abbrevs; } |
| |
| protected: |
| // Set the final data size. |
| void |
| set_final_data_size(); |
| |
| // Write out the new debug info |
| void |
| do_write(Output_file*); |
| |
| private: |
| void |
| failed(std::string reason) |
| { |
| gold_warning("%s", reason.c_str()); |
| this->failed_ = true; |
| } |
| |
| // Given a pointer to the beginning of a die and the beginning of the |
| // associated abbreviation fills in die_end with the end of the information |
| // entry. If successful returns true. Get_die_end also takes a pointer to |
| // the end of the buffer containing the die. If die_end would be beyond the |
| // end of the buffer, or if an unsupported dwarf form is encountered returns |
| // false. |
| bool |
| get_die_end(unsigned char* die, unsigned char* abbrev, |
| unsigned char** die_end, unsigned char* buffer_end, |
| int address_size, bool is64); |
| |
| // The reduced debug info |
| std::vector<unsigned char> data_; |
| |
| // Each debug info section needs to be associated with a debug abbrev section |
| Output_reduced_debug_abbrev_section* associated_abbrev_; |
| |
| // Whether or not the debug reduction has failed for any reason |
| bool failed_; |
| }; |
| |
| } // End namespace gold. |
| |
| #endif // !defined(GOLD_REDUCED_DEBUG_OUTPUT_H) |