1
// reduced_debug_output.h -- reduce debugging information -*- C++ -*-
3
// Copyright 2008 Free Software Foundation, Inc.
4
// Written by Caleb Howe <cshowe@google.com>.
6
// This file is part of gold.
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.
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.
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.
23
// Reduce the size of the debug sections by emitting only debug line number
24
// information. We still need to emit skeleton debug_info and debug_abbrev
25
// sections for standard tools to parse the debug information correctly. These
26
// classes remove all debug information entries from the .debug_info section
27
// except for those describing compilation units as these DIEs contain
28
// references to the debug line information needed by most parsers.
30
#ifndef GOLD_REDUCED_DEBUG_OUTPUT_H
31
#define GOLD_REDUCED_DEBUG_OUTPUT_H
42
class Output_reduced_debug_abbrev_section : public Output_section
45
Output_reduced_debug_abbrev_section(const char* name, elfcpp::Elf_Word flags,
46
elfcpp::Elf_Xword type)
47
: Output_section(name, flags, type), sized_(false),
48
abbrev_count_(0), failed_(false)
49
{ this->set_requires_postprocessing(); }
51
unsigned char* get_new_abbrev(uint64_t* abbrev_number,
52
uint64_t abbrev_offset);
55
// Set the final data size.
57
set_final_data_size();
59
// Write out the new debug abbreviations
61
do_write(Output_file*);
65
failed(std::string reason)
67
gold_warning("%s", reason.c_str());
71
// The reduced debug abbreviations
72
std::vector<unsigned char> data_;
74
// We map the abbreviation table offset and abbreviation number of the
75
// old abbreviation to the number and size of the new abbreviation.
76
std::map<std::pair<uint64_t, uint64_t>,
77
std::pair<uint64_t, uint64_t> > abbrev_mapping_;
81
// The count of abbreviations in the output data
84
// Whether or not the debug reduction has failed for any reason
88
class Output_reduced_debug_info_section : public Output_section
91
Output_reduced_debug_info_section(const char* name, elfcpp::Elf_Word flags,
92
elfcpp::Elf_Xword type)
93
: Output_section(name, flags, type), failed_(false)
94
{ this->set_requires_postprocessing(); }
97
set_abbreviations(Output_reduced_debug_abbrev_section* abbrevs)
98
{ associated_abbrev_ = abbrevs; }
101
// Set the final data size.
103
set_final_data_size();
105
// Write out the new debug info
107
do_write(Output_file*);
111
failed(std::string reason)
113
gold_warning("%s", reason.c_str());
114
this->failed_ = true;
117
// Given a pointer to the beginning of a die and the beginning of the
118
// associated abbreviation fills in die_end with the end of the information
119
// entry. If successful returns true. Get_die_end also takes a pointer to
120
// the end of the buffer containing the die. If die_end would be beyond the
121
// end of the buffer, or if an unsupported dwarf form is encountered returns
124
get_die_end(unsigned char* die, unsigned char* abbrev,
125
unsigned char** die_end, unsigned char* buffer_end,
126
int address_size, bool is64);
128
// The reduced debug info
129
std::vector<unsigned char> data_;
131
// Each debug info section needs to be associated with a debug abbrev section
132
Output_reduced_debug_abbrev_section* associated_abbrev_;
134
// Whether or not the debug reduction has failed for any reason
138
} // End namespace gold.
140
#endif // !defined(GOLD_REDUCED_DEBUG_OUTPUT_H)