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// parameters.h -- general parameters for a link using gold  -*- C++ -*-

// Copyright 2006, 2007, 2008, 2009, 2010 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_PARAMETERS_H

#define GOLD_PARAMETERS_H

namespace gold

{

class General_options;

class Errors;

class Target;

template<int size, bool big_endian>

class Sized_target;

class Set_parameters_target_once;

// Here we define the Parameters class which simply holds simple

// general parameters which apply to the entire link.  We use a global

// variable for this.  The parameters class holds three types of data:

//    1) An Errors struct.  Any part of the code that wants to log an

//       error can use parameters->errors().

//    2) A const General_options.  These are the options as read on

//       the commandline.

//    3) Target information, such as size and endian-ness.  This is

//       available as soon as we've decided on the Target (after

//       parsing the first .o file).

//    4) Whether we're doing a static link or not.  This is set

//       after all inputs have been read and we know if any is a

//       dynamic library.

class Parameters

{

 public:

  Parameters();

  // These should be called as soon as they are known.

  void

  set_errors(Errors* errors);

  void

  set_options(const General_options* options);

  void

  set_target(Target* target);

  void

  set_doing_static_link(bool doing_static_link);

  // Return the error object.

  Errors*

  errors() const

  { return this->errors_; }

  // Whether the options are valid.  This should not normally be

  // called, but it is needed by gold_exit.

  bool

  options_valid() const

  { return this->options_ != NULL; }

  // Return the options object.

  const General_options&

  options() const

  {

    gold_assert(this->options_valid());

    return *this->options_;

  }

  // Return whether the target field has been set.

  bool

  target_valid() const

  { return this->target_ != NULL; }

  // The target of the output file we are generating.

  const Target&

  target() const

  {

    gold_assert(this->target_valid());

    return *this->target_;

  }

  // The Sized_target of the output file.  The caller must request the

  // right size and endianness.

  template<int size, bool big_endian>

  Sized_target<size, big_endian>*

  sized_target() const

  {

    gold_assert(this->target_valid());

    return static_cast<Sized_target<size, big_endian>*>(this->target_);

  }

  // Clear the target, for testing.

  void

  clear_target();

  // Return true if TARGET is compatible with the current target.

  bool

  is_compatible_target(const Target*) const;

  bool

  doing_static_link() const

  {

    gold_assert(this->doing_static_link_valid_);

    return this->doing_static_link_;

  }

  // This is just a copy of options().debug().  We make a copy so we

  // don't have to #include options.h in order to inline

  // is_debugging_enabled, below.

  int

  debug() const

  {

    // This can be called before the options are set up.

    if (!this->options_valid())

      return 0;

    return debug_;

  }

  // Return the name of the entry symbol.

  const char*

  entry() const;

  // A convenience routine for combining size and endianness.  It also

  // checks the HAVE_TARGET_FOO configure options and dies if the

  // current target's size/endianness is not supported according to

  // HAVE_TARGET_FOO.  Otherwise it returns this enum

  enum Target_size_endianness

  { TARGET_32_LITTLE, TARGET_32_BIG, TARGET_64_LITTLE, TARGET_64_BIG };

  Target_size_endianness

  size_and_endianness() const;

  // Set the incremental linking mode to INCREMENTAL_FULL.  Used when

  // the linker determines that an incremental update is not possible.

  // Returns false if the incremental mode was INCREMENTAL_UPDATE,

  // indicating that the linker should exit if an update is not possible.

  bool

  set_incremental_full();

  // Return true if we need to prepare incremental linking information.

  bool

  incremental() const;

  // Return true if we are doing an incremental update.

  bool

  incremental_update() const;

 private:

  void

  set_target_once(Target*);

  void

  check_target_endianness();

  friend class Set_parameters_target_once;

  Errors* errors_;

  const General_options* options_;

  Target* target_;

  bool doing_static_link_valid_;

  bool doing_static_link_;

  int debug_;

  int incremental_mode_;

  Set_parameters_target_once* set_parameters_target_once_;

};

// This is a global variable.

extern const Parameters* parameters;

// We use free functions for these since they affect a global variable

// that is internal to parameters.cc.

extern void

set_parameters_errors(Errors* errors);

extern void

set_parameters_options(const General_options* options);

extern void

set_parameters_target(Target* target);

extern void

set_parameters_doing_static_link(bool doing_static_link);

extern bool

set_parameters_incremental_full();

// Ensure that the target to be valid by using the default target if

// necessary.

extern void

parameters_force_valid_target();

// Clear the current target, for testing.

extern void

parameters_clear_target();

// Return whether we are doing a particular debugging type.  The

// argument is one of the flags from debug.h.

inline bool

is_debugging_enabled(unsigned int type)

{ return (parameters->debug() & type) != 0; }

} // End namespace gold.

#endif // !defined(GOLD_PARAMETERS_H)