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// parameters.cc -- general parameters for a link using gold

// 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.

#include "gold.h"

#include "debug.h"

#include "options.h"

#include "target.h"

#include "target-select.h"

namespace gold

{

// Our local version of the variable, which is not const.

static Parameters static_parameters;

// The global variable.

const Parameters* parameters = &static_parameters;

// A helper class to set the target once.

class Set_parameters_target_once : public Once

{

 public:

  Set_parameters_target_once(Parameters* parameters)

    : parameters_(parameters)

  { }

 protected:

  void

  do_run_once(void* arg)

  { this->parameters_->set_target_once(static_cast<Target*>(arg)); }

 private:

  Parameters* parameters_;

};

// We only need one Set_parameters_target_once.

static

Set_parameters_target_once set_parameters_target_once(&static_parameters);

// Class Parameters.

Parameters::Parameters()

   : errors_(NULL), options_(NULL), target_(NULL),

     doing_static_link_valid_(false), doing_static_link_(false),

     debug_(0), incremental_mode_(General_options::INCREMENTAL_OFF),

     set_parameters_target_once_(&set_parameters_target_once)

 {

 }

void

Parameters::set_errors(Errors* errors)

{

  gold_assert(this->errors_ == NULL);

  this->errors_ = errors;

}

void

Parameters::set_options(const General_options* options)

{

  gold_assert(!this->options_valid());

  this->options_ = options;

  // For speed, we convert the options() debug var from a string to an

  // enum (from debug.h).

  this->debug_ = debug_string_to_enum(this->options().debug());

  // Set incremental_mode_ based on the value of the --incremental option.

  // We copy the mode into parameters because it can change based on inputs.

  this->incremental_mode_ = this->options().incremental_mode();

  // If --verbose is set, it acts as "--debug=files".

  if (options->verbose())

    this->debug_ |= DEBUG_FILES;

  if (this->target_valid())

    this->check_target_endianness();

}

void

Parameters::set_doing_static_link(bool doing_static_link)

{

  gold_assert(!this->doing_static_link_valid_);

  this->doing_static_link_ = doing_static_link;

  this->doing_static_link_valid_ = true;

}

void

Parameters::set_target(Target* target)

{

  this->set_parameters_target_once_->run_once(static_cast<void*>(target));

  gold_assert(target == this->target_);

}

// This is called at most once.

void

Parameters::set_target_once(Target* target)

{

  gold_assert(this->target_ == NULL);

  this->target_ = target;

  if (this->options_valid())

    this->check_target_endianness();

}

// Clear the target, for testing.

void

Parameters::clear_target()

{

  this->target_ = NULL;

  // We need a new Set_parameters_target_once so that we can set the

  // target again.

  this->set_parameters_target_once_ = new Set_parameters_target_once(this);

}

// Return whether TARGET is compatible with the target we are using.

bool

Parameters::is_compatible_target(const Target* target) const

{

  if (this->target_ == NULL)

    return true;

  return target == this->target_;

}

Parameters::Target_size_endianness

Parameters::size_and_endianness() const

{

  if (this->target().get_size() == 32)

    {

      if (!this->target().is_big_endian())

        {

#ifdef HAVE_TARGET_32_LITTLE

          return TARGET_32_LITTLE;

#else

          gold_unreachable();

#endif

        }

      else

        {

#ifdef HAVE_TARGET_32_BIG

          return TARGET_32_BIG;

#else

          gold_unreachable();

#endif

        }

    }

  else if (parameters->target().get_size() == 64)

    {

      if (!parameters->target().is_big_endian())

        {

#ifdef HAVE_TARGET_64_LITTLE

          return TARGET_64_LITTLE;

#else

          gold_unreachable();

#endif

        }

      else

        {

#ifdef HAVE_TARGET_64_BIG

          return TARGET_64_BIG;

#else

          gold_unreachable();

#endif

        }

    }

  else

    gold_unreachable();

}

// If output endianness is specified in command line, check that it does

// not conflict with the target.

void

Parameters::check_target_endianness()

{

  General_options::Endianness endianness = this->options().endianness();

  if (endianness != General_options::ENDIANNESS_NOT_SET)

    {

      bool big_endian;

      if (endianness == General_options::ENDIANNESS_BIG)

        big_endian = true;

      else

        {

          gold_assert(endianness == General_options::ENDIANNESS_LITTLE);

          big_endian = false;;

        }

      if (this->target().is_big_endian() != big_endian)

        gold_error(_("input file does not match -EB/EL option"));

    }

}

// Return the name of the entry symbol.

const char*

Parameters::entry() const

{

  const char* ret = this->options().entry();

  if (ret == NULL)

    {

      // FIXME: Need to support target specific entry symbol.

      ret = "_start";

    }

  return ret;

}

// 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

Parameters::set_incremental_full()

{

  gold_assert(this->incremental_mode_ != General_options::INCREMENTAL_OFF);

  if (this->incremental_mode_ == General_options::INCREMENTAL_UPDATE)

    return false;

  this->incremental_mode_ = General_options::INCREMENTAL_FULL;

  return true;

}

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

bool

Parameters::incremental() const

{

  return this->incremental_mode_ != General_options::INCREMENTAL_OFF;

}

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

bool

Parameters::incremental_update() const

{

  return (this->incremental_mode_ == General_options::INCREMENTAL_UPDATE

          || this->incremental_mode_ == General_options::INCREMENTAL_AUTO);

}

void

set_parameters_errors(Errors* errors)

{ static_parameters.set_errors(errors); }

void

set_parameters_options(const General_options* options)

{ static_parameters.set_options(options); }

void

set_parameters_target(Target* target)

{

  static_parameters.set_target(target);

  target->select_as_default_target();

}

void

set_parameters_doing_static_link(bool doing_static_link)

{ static_parameters.set_doing_static_link(doing_static_link); }

// 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_parameters_incremental_full()

{ return static_parameters.set_incremental_full(); }

// Force the target to be valid by using the default.  Use the

// --oformat option is set; this supports the x86_64 kernel build,

// which converts a binary file to an object file using -r --format

// binary --oformat elf32-i386 foo.o.  Otherwise use the configured

// default.

void

parameters_force_valid_target()

{

  if (parameters->target_valid())

    return;

  gold_assert(parameters->options_valid());

  if (parameters->options().user_set_oformat())

    {

      Target* target = select_target_by_name(parameters->options().oformat());

      if (target != NULL)

        {

          set_parameters_target(target);

          return;

        }

      gold_error(_("unrecognized output format %s"),

                 parameters->options().oformat());

    }

  // The GOLD_DEFAULT_xx macros are defined by the configure script.

  bool is_big_endian;

  General_options::Endianness endianness = parameters->options().endianness();

  if (endianness == General_options::ENDIANNESS_BIG)

    is_big_endian = true;

  else if (endianness == General_options::ENDIANNESS_LITTLE)

    is_big_endian = false;

  else

    is_big_endian = GOLD_DEFAULT_BIG_ENDIAN;

  Target* target = select_target(elfcpp::GOLD_DEFAULT_MACHINE,

                                 GOLD_DEFAULT_SIZE,

                                 is_big_endian,

                                 elfcpp::GOLD_DEFAULT_OSABI,

                                 0);

  gold_assert(target != NULL);

  set_parameters_target(target);

}

// Clear the current target, for testing.

void

parameters_clear_target()

{

  static_parameters.clear_target();

}

} // End namespace gold.