gold/parameters.cc

   1 // parameters.cc -- general parameters for a link using gold
   2
   3 // Copyright 2006, 2007, 2008, 2009, 2010 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 #include "gold.h"
  24
  25 #include "debug.h"
  26 #include "options.h"
  27 #include "target.h"
  28 #include "target-select.h"
  29
  30 namespace gold
  31 {
  32
  33 // Our local version of the variable, which is not const.
  34
  35 static Parameters static_parameters;
  36
  37 // The global variable.
  38
  39 const Parameters* parameters = &static_parameters;
  40
  41 // A helper class to set the target once.
  42
  43 class Set_parameters_target_once : public Once
  44 {
  45  public:
  46   Set_parameters_target_once(Parameters* parameters)
  47     : parameters_(parameters)
  48   { }
  49
  50  protected:
  51   void
  52   do_run_once(void* arg)
  53   { this->parameters_->set_target_once(static_cast<Target*>(arg)); }
  54
  55  private:
  56   Parameters* parameters_;
  57 };
  58
  59 // We only need one Set_parameters_target_once.
  60
  61 static
  62 Set_parameters_target_once set_parameters_target_once(&static_parameters);
  63
  64 // Class Parameters.
  65
  66 Parameters::Parameters()
  67    : errors_(NULL), options_(NULL), target_(NULL),
  68      doing_static_link_valid_(false), doing_static_link_(false),
  69      debug_(0),
  70      set_parameters_target_once_(&set_parameters_target_once)
  71  {
  72  }
  73
  74 void
  75 Parameters::set_errors(Errors* errors)
  76 {
  77   gold_assert(this->errors_ == NULL);
  78   this->errors_ = errors;
  79 }
  80
  81 void
  82 Parameters::set_options(const General_options* options)
  83 {
  84   gold_assert(!this->options_valid());
  85   this->options_ = options;
  86   // For speed, we convert the options() debug var from a string to an
  87   // enum (from debug.h).
  88   this->debug_ = debug_string_to_enum(this->options().debug());
  89   // If --verbose is set, it acts as "--debug=files".
  90   if (options->verbose())
  91     this->debug_ |= DEBUG_FILES;
  92   if (this->target_valid())
  93     this->check_target_endianness();
  94 }
  95
  96 void
  97 Parameters::set_doing_static_link(bool doing_static_link)
  98 {
  99   gold_assert(!this->doing_static_link_valid_);
 100   this->doing_static_link_ = doing_static_link;
 101   this->doing_static_link_valid_ = true;
 102 }
 103
 104 void
 105 Parameters::set_target(Target* target)
 106 {
 107   this->set_parameters_target_once_->run_once(static_cast<void*>(target));
 108   gold_assert(target == this->target_);
 109 }
 110
 111 // This is called at most once.
 112
 113 void
 114 Parameters::set_target_once(Target* target)
 115 {
 116   gold_assert(this->target_ == NULL);
 117   this->target_ = target;
 118   if (this->options_valid())
 119     this->check_target_endianness();
 120 }
 121
 122 // Clear the target, for testing.
 123
 124 void
 125 Parameters::clear_target()
 126 {
 127   this->target_ = NULL;
 128   // We need a new Set_parameters_target_once so that we can set the
 129   // target again.
 130   this->set_parameters_target_once_ = new Set_parameters_target_once(this);
 131 }
 132
 133 // Return whether TARGET is compatible with the target we are using.
 134
 135 bool
 136 Parameters::is_compatible_target(const Target* target) const
 137 {
 138   if (this->target_ == NULL)
 139     return true;
 140   return target == this->target_;
 141 }
 142
 143 Parameters::Target_size_endianness
 144 Parameters::size_and_endianness() const
 145 {
 146   if (this->target().get_size() == 32)
 147     {
 148       if (!this->target().is_big_endian())
 149         {
 150 #ifdef HAVE_TARGET_32_LITTLE
 151           return TARGET_32_LITTLE;
 152 #else
 153           gold_unreachable();
 154 #endif
 155         }
 156       else
 157         {
 158 #ifdef HAVE_TARGET_32_BIG
 159           return TARGET_32_BIG;
 160 #else
 161           gold_unreachable();
 162 #endif
 163         }
 164     }
 165   else if (parameters->target().get_size() == 64)
 166     {
 167       if (!parameters->target().is_big_endian())
 168         {
 169 #ifdef HAVE_TARGET_64_LITTLE
 170           return TARGET_64_LITTLE;
 171 #else
 172           gold_unreachable();
 173 #endif
 174         }
 175       else
 176         {
 177 #ifdef HAVE_TARGET_64_BIG
 178           return TARGET_64_BIG;
 179 #else
 180           gold_unreachable();
 181 #endif
 182         }
 183     }
 184   else
 185     gold_unreachable();
 186 }
 187
 188 // If output endianness is specified in command line, check that it does
 189 // not conflict with the target.
 190
 191 void
 192 Parameters::check_target_endianness()
 193 {
 194   General_options::Endianness endianness = this->options().endianness();
 195   if (endianness != General_options::ENDIANNESS_NOT_SET)
 196     {
 197       bool big_endian;
 198       if (endianness == General_options::ENDIANNESS_BIG)
 199         big_endian = true;
 200       else
 201         {
 202           gold_assert(endianness == General_options::ENDIANNESS_LITTLE);
 203           big_endian = false;;
 204         }
 205
 206       if (this->target().is_big_endian() != big_endian)
 207         gold_error(_("input file does not match -EB/EL option"));
 208     }
 209 }
 210
 211 void
 212 set_parameters_errors(Errors* errors)
 213 { static_parameters.set_errors(errors); }
 214
 215 void
 216 set_parameters_options(const General_options* options)
 217 { static_parameters.set_options(options); }
 218
 219 void
 220 set_parameters_target(Target* target)
 221 {
 222   static_parameters.set_target(target);
 223   target->select_as_default_target();
 224 }
 225
 226 void
 227 set_parameters_doing_static_link(bool doing_static_link)
 228 { static_parameters.set_doing_static_link(doing_static_link); }
 229
 230 // Force the target to be valid by using the default.  Use the
 231 // --oformat option is set; this supports the x86_64 kernel build,
 232 // which converts a binary file to an object file using -r --format
 233 // binary --oformat elf32-i386 foo.o.  Otherwise use the configured
 234 // default.
 235
 236 void
 237 parameters_force_valid_target()
 238 {
 239   if (parameters->target_valid())
 240     return;
 241
 242   gold_assert(parameters->options_valid());
 243   if (parameters->options().user_set_oformat())
 244     {
 245       Target* target = select_target_by_name(parameters->options().oformat());
 246       if (target != NULL)
 247         {
 248           set_parameters_target(target);
 249           return;
 250         }
 251
 252       gold_error(_("unrecognized output format %s"),
 253                  parameters->options().oformat());
 254     }
 255
 256   // The GOLD_DEFAULT_xx macros are defined by the configure script.
 257   bool is_big_endian;
 258   General_options::Endianness endianness = parameters->options().endianness();
 259   if (endianness == General_options::ENDIANNESS_BIG)
 260     is_big_endian = true;
 261   else if (endianness == General_options::ENDIANNESS_LITTLE)
 262     is_big_endian = false;
 263   else
 264     is_big_endian = GOLD_DEFAULT_BIG_ENDIAN;
 265
 266   Target* target = select_target(elfcpp::GOLD_DEFAULT_MACHINE,
 267                                  GOLD_DEFAULT_SIZE,
 268                                  is_big_endian,
 269                                  elfcpp::GOLD_DEFAULT_OSABI,
 270                                  0);
 271   gold_assert(target != NULL);
 272   set_parameters_target(target);
 273 }
 274
 275 // Clear the current target, for testing.
 276
 277 void
 278 parameters_clear_target()
 279 {
 280   static_parameters.clear_target();
 281 }
 282
 283 } // End namespace gold.