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// errors.h -- handle errors for gold  -*- C++ -*-

// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.

// Written by Ian Lance Taylor <iant@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.

#ifndef GOLD_ERRORS_H

#define GOLD_ERRORS_H

#include <cstdarg>

#include "gold-threads.h"

namespace gold

{

class Symbol;

template<int size, bool big_endian>

struct Relocate_info;

// This class handles errors for gold.  There is a single instance

// which is used by all threads.  If and when we make the gold code

// more amenable to being used in a library, we will make this an

// abstract interface class, and expect the caller to provide their

// own instantiation.

class Errors

{

 public:

  Errors(const char* program_name);

  // Report a fatal error.  After printing the error, this must exit.

  void

  fatal(const char* format, va_list) ATTRIBUTE_NORETURN;

  // Report a fallback error.  After printing the error, this must exit

  // with a special status code indicating that fallback to

  // --incremental-full is required.

  void

  fallback(const char* format, va_list) ATTRIBUTE_NORETURN;

  // Report an error and continue.

  void

  error(const char* format, va_list);

  // Report a warning and continue.

  void

  warning(const char* format, va_list);

  // Print an informational message and continue.

  void

  info(const char* format, va_list);

  // Report an error at a reloc location.

  template<int size, bool big_endian>

  void

  error_at_location(const Relocate_info<size, big_endian>* relinfo,

                    size_t relnum, off_t reloffset,

                    const char* format, va_list);

  // Report a warning at a reloc location.

  template<int size, bool big_endian>

  void

  warning_at_location(const Relocate_info<size, big_endian>* relinfo,

                      size_t relnum, off_t reloffset,

                      const char* format, va_list);

  // Issue an undefined symbol error.  LOCATION is the location of

  // the error (typically an object file name or relocation info).

  void

  undefined_symbol(const Symbol* sym, const std::string& location);

  // Report a debugging message.

  void

  debug(const char* format, ...) ATTRIBUTE_PRINTF_2;

  // Return the number of errors.

  int

  error_count() const

  { return this->error_count_; }

  // Return the number of warnings.

  int

  warning_count() const

  { return this->warning_count_; }

 private:

  Errors(const Errors&);

  Errors& operator=(const Errors&);

  // Initialize the lock.  We don't do this in the constructor because

  // lock initialization wants to know whether we are using threads or

  // not.  This returns true if the lock is now initialized.

  bool

  initialize_lock();

  // Increment a counter, holding the lock.

  void

  increment_counter(int*);

  // The number of times we report an undefined symbol.

  static const int max_undefined_error_report = 5;

  // The name of the program.

  const char* program_name_;

  // This class can be accessed from multiple threads.  This lock is

  // used to control access to the data structures.

  Lock* lock_;

  // Used to initialize the lock_ field exactly once.

  Initialize_lock initialize_lock_;

  // Numbers of errors reported.

  int error_count_;

  // Number of warnings reported.

  int warning_count_;

  // A map counting the numbers of times we have seen an undefined

  // symbol.

  Unordered_map<const Symbol*, int> undefined_symbols_;

};

} // End namespace gold.

#endif // !defined(GOLD_ERRORS_H)