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// parameters.cc -- general parameters for a link using gold
 
// 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.
 
#include "gold.h"
 
#include "debug.h"
#include "options.h"
#include "target.h"
#include "target-select.h"
 
namespace gold
{
 
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());
  // If --verbose is set, it acts as "--debug=files".
  if (options->verbose())
    this->debug_ |= DEBUG_FILES;
}
 
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)
{
  if (!this->target_valid())
    this->target_ = target;
  else
    gold_assert(target == this->target_);
}
 
// 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();
}
 
 
// Our local version of the variable, which is not const.
 
static Parameters static_parameters;
 
// The global variable.
 
const Parameters* parameters = &static_parameters;
 
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); }
 
void
set_parameters_doing_static_link(bool doing_static_link)
{ static_parameters.set_doing_static_link(doing_static_link); }
 
// 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.
  Target* target = select_target(elfcpp::GOLD_DEFAULT_MACHINE,
				 GOLD_DEFAULT_SIZE,
				 GOLD_DEFAULT_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.