gold/errors.h

   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
  31 namespace gold
  32 {
  33
  34 class Symbol;
  35 template<int size, bool big_endian>
  36 struct 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
  44 class 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)