141 lines
4.2 KiB
C++
141 lines
4.2 KiB
C++
// reduced_debug_output.h -- reduce debugging information -*- C++ -*-
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// Copyright 2008 Free Software Foundation, Inc.
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// Written by Caleb Howe <cshowe@google.com>.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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// Reduce the size of the debug sections by emitting only debug line number
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// information. We still need to emit skeleton debug_info and debug_abbrev
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// sections for standard tools to parse the debug information correctly. These
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// classes remove all debug information entries from the .debug_info section
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// except for those describing compilation units as these DIEs contain
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// references to the debug line information needed by most parsers.
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#ifndef GOLD_REDUCED_DEBUG_OUTPUT_H
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#define GOLD_REDUCED_DEBUG_OUTPUT_H
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#include <map>
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#include <utility>
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#include <vector>
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#include "output.h"
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namespace gold
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{
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class Output_reduced_debug_abbrev_section : public Output_section
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{
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public:
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Output_reduced_debug_abbrev_section(const char* name, elfcpp::Elf_Word flags,
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elfcpp::Elf_Xword type)
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: Output_section(name, flags, type), sized_(false),
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abbrev_count_(0), failed_(false)
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{ this->set_requires_postprocessing(); }
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unsigned char* get_new_abbrev(uint64_t* abbrev_number,
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uint64_t abbrev_offset);
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protected:
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// Set the final data size.
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void
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set_final_data_size();
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// Write out the new debug abbreviations
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void
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do_write(Output_file*);
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private:
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void
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failed(std::string reason)
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{
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gold_warning("%s", reason.c_str());
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failed_ = true;
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}
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// The reduced debug abbreviations
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std::vector<unsigned char> data_;
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// We map the abbreviation table offset and abbreviation number of the
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// old abbreviation to the number and size of the new abbreviation.
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std::map<std::pair<uint64_t, uint64_t>,
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std::pair<uint64_t, uint64_t> > abbrev_mapping_;
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bool sized_;
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// The count of abbreviations in the output data
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int abbrev_count_;
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// Whether or not the debug reduction has failed for any reason
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bool failed_;
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};
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class Output_reduced_debug_info_section : public Output_section
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{
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public:
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Output_reduced_debug_info_section(const char* name, elfcpp::Elf_Word flags,
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elfcpp::Elf_Xword type)
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: Output_section(name, flags, type), failed_(false)
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{ this->set_requires_postprocessing(); }
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void
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set_abbreviations(Output_reduced_debug_abbrev_section* abbrevs)
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{ associated_abbrev_ = abbrevs; }
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protected:
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// Set the final data size.
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void
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set_final_data_size();
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// Write out the new debug info
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void
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do_write(Output_file*);
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private:
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void
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failed(std::string reason)
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{
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gold_warning("%s", reason.c_str());
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this->failed_ = true;
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}
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// Given a pointer to the beginning of a die and the beginning of the
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// associated abbreviation fills in die_end with the end of the information
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// entry. If successful returns true. Get_die_end also takes a pointer to
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// the end of the buffer containing the die. If die_end would be beyond the
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// end of the buffer, or if an unsupported dwarf form is encountered returns
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// false.
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bool
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get_die_end(unsigned char* die, unsigned char* abbrev,
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unsigned char** die_end, unsigned char* buffer_end,
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int address_size, bool is64);
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// The reduced debug info
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std::vector<unsigned char> data_;
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// Each debug info section needs to be associated with a debug abbrev section
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Output_reduced_debug_abbrev_section* associated_abbrev_;
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// Whether or not the debug reduction has failed for any reason
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bool failed_;
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};
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} // End namespace gold.
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#endif // !defined(GOLD_REDUCED_DEBUG_OUTPUT_H)
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