gold/errors.h

   1 // errors.h -- handle errors for gold  -*- C++ -*-
   2
   3 // Copyright (C) 2006-2019 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
  28 #include "gold-threads.h"
  29
  30 namespace gold
  31 {
  32
  33 class Symbol;
  34 template<int size, bool big_endian>
  35 struct Relocate_info;
  36
  37 // This class handles errors for gold.  There is a single instance
  38 // which is used by all threads.  If and when we make the gold code
  39 // more amenable to being used in a library, we will make this an
  40 // abstract interface class, and expect the caller to provide their
  41 // own instantiation.
  42
  43 class Errors
  44 {
  45  public:
  46   Errors(const char* program_name);
  47
  48   // Report a fatal error.  After printing the error, this must exit.
  49   void
  50   fatal(const char* format, va_list) ATTRIBUTE_NORETURN;
  51
  52   // Report a fallback error.  After printing the error, this must exit
  53   // with a special status code indicating that fallback to
  54   // --incremental-full is required.
  55   void
  56   fallback(const char* format, va_list) ATTRIBUTE_NORETURN;
  57
  58   // Report an error and continue.
  59   void
  60   error(const char* format, va_list);
  61
  62   // Report a warning and continue.
  63   void
  64   warning(const char* format, va_list);
  65
  66   // Print an informational message and continue.
  67   void
  68   info(const char* format, va_list);
  69
  70   // Report an error at a reloc location.
  71   template<int size, bool big_endian>
  72   void
  73   error_at_location(const Relocate_info<size, big_endian>* relinfo,
  74                     size_t relnum, off_t reloffset,
  75                     const char* format, va_list);
  76
  77   // Report a warning at a reloc location.
  78   template<int size, bool big_endian>
  79   void
  80   warning_at_location(const Relocate_info<size, big_endian>* relinfo,
  81                       size_t relnum, off_t reloffset,
  82                       const char* format, va_list);
  83
  84   // Issue an undefined symbol error.  LOCATION is the location of
  85   // the error (typically an object file name or relocation info).
  86   void
  87   undefined_symbol(const Symbol* sym, const std::string& location);
  88
  89   // Report a debugging message.
  90   void
  91   debug(const char* format, ...) ATTRIBUTE_PRINTF_2;
  92
  93   // Return the number of errors.
  94   int
  95   error_count() const
  96   { return this->error_count_; }
  97
  98   // Return the number of warnings.
  99   int
 100   warning_count() const
 101   { return this->warning_count_; }
 102
 103  private:
 104   Errors(const Errors&);
 105   Errors& operator=(const Errors&);
 106
 107   // Initialize the lock.  We don't do this in the constructor because
 108   // lock initialization wants to know whether we are using threads or
 109   // not.  This returns true if the lock is now initialized.
 110   bool
 111   initialize_lock();
 112
 113   // Increment a counter, holding the lock.
 114   void
 115   increment_counter(int*);
 116
 117   // The number of times we report an undefined symbol.
 118   static const int max_undefined_error_report = 5;
 119
 120   // The name of the program.
 121   const char* program_name_;
 122   // This class can be accessed from multiple threads.  This lock is
 123   // used to control access to the data structures.
 124   Lock* lock_;
 125   // Used to initialize the lock_ field exactly once.
 126   Initialize_lock initialize_lock_;
 127   // Numbers of errors reported.
 128   int error_count_;
 129   // Number of warnings reported.
 130   int warning_count_;
 131   // A map counting the numbers of times we have seen an undefined
 132   // symbol.
 133   Unordered_map<const Symbol*, int> undefined_symbols_;
 134 };
 135
 136 } // End namespace gold.
 137
 138 #endif // !defined(GOLD_ERRORS_H)