1// errors.h -- handle errors for gold  -*- C++ -*-
2
3// Copyright (C) 2006-2020 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#ifndef GOLD_ERRORS_H
24#define GOLD_ERRORS_H
25
26#include <cstdarg>
27#include <string>
28
29#include "gold-threads.h"
30
31namespace gold
32{
33
34class Symbol;
35template<int size, bool big_endian>
36struct Relocate_info;
37
38// This class handles errors for gold.  There is a single instance
39// which is used by all threads.  If and when we make the gold code
40// more amenable to being used in a library, we will make this an
41// abstract interface class, and expect the caller to provide their
42// own instantiation.
43
44class Errors
45{
46 public:
47  Errors(const char* program_name);
48
49  // Report a fatal error.  After printing the error, this must exit.
50  void
51  fatal(const char* format, va_list) ATTRIBUTE_NORETURN;
52
53  // Report a fallback error.  After printing the error, this must exit
54  // with a special status code indicating that fallback to
55  // --incremental-full is required.
56  void
57  fallback(const char* format, va_list) ATTRIBUTE_NORETURN;
58
59  // Report an error and continue.
60  void
61  error(const char* format, va_list);
62
63  // Report a warning and continue.
64  void
65  warning(const char* format, va_list);
66
67  // Print an informational message and continue.
68  void
69  info(const char* format, va_list);
70
71  // Report an error at a reloc location.
72  template<int size, bool big_endian>
73  void
74  error_at_location(const Relocate_info<size, big_endian>* relinfo,
75		    size_t relnum, off_t reloffset,
76		    const char* format, va_list);
77
78  // Report a warning at a reloc location.
79  template<int size, bool big_endian>
80  void
81  warning_at_location(const Relocate_info<size, big_endian>* relinfo,
82		      size_t relnum, off_t reloffset,
83		      const char* format, va_list);
84
85  // Issue an undefined symbol error.  LOCATION is the location of
86  // the error (typically an object file name or relocation info).
87  void
88  undefined_symbol(const Symbol* sym, const std::string& location);
89
90  // Report a debugging message.
91  void
92  debug(const char* format, ...) ATTRIBUTE_PRINTF_2;
93
94  // Return the number of errors.
95  int
96  error_count() const
97  { return this->error_count_; }
98
99  // Return the number of warnings.
100  int
101  warning_count() const
102  { return this->warning_count_; }
103
104 private:
105  Errors(const Errors&);
106  Errors& operator=(const Errors&);
107
108  // Initialize the lock.  We don't do this in the constructor because
109  // lock initialization wants to know whether we are using threads or
110  // not.  This returns true if the lock is now initialized.
111  bool
112  initialize_lock();
113
114  // Increment a counter, holding the lock.
115  void
116  increment_counter(int*);
117
118  // The number of times we report an undefined symbol.
119  static const int max_undefined_error_report = 5;
120
121  // The name of the program.
122  const char* program_name_;
123  // This class can be accessed from multiple threads.  This lock is
124  // used to control access to the data structures.
125  Lock* lock_;
126  // Used to initialize the lock_ field exactly once.
127  Initialize_lock initialize_lock_;
128  // Numbers of errors reported.
129  int error_count_;
130  // Number of warnings reported.
131  int warning_count_;
132  // A map counting the numbers of times we have seen an undefined
133  // symbol.
134  Unordered_map<const Symbol*, int> undefined_symbols_;
135};
136
137} // End namespace gold.
138
139#endif // !defined(GOLD_ERRORS_H)
140