141 lines
4.2 KiB
C++
141 lines
4.2 KiB
C++
// reduced_debug_output.h -- reduce debugging information -*- C++ -*-
|
|
|
|
// Copyright (C) 2008-2020 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)
|