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 }
  93
  94 void
  95 Parameters::set_doing_static_link(bool doing_static_link)
  96 {
  97   gold_assert(!this->doing_static_link_valid_);
  98   this->doing_static_link_ = doing_static_link;
  99   this->doing_static_link_valid_ = true;
 100 }
 101
 102 void
 103 Parameters::set_target(Target* target)
 104 {
 105   this->set_parameters_target_once_->run_once(static_cast<void*>(target));
 106   gold_assert(target == this->target_);
 107 }
 108
 109 // This is called at most once.
 110
 111 void
 112 Parameters::set_target_once(Target* target)
 113 {
 114   gold_assert(this->target_ == NULL);
 115   this->target_ = target;
 116 }
 117
 118 // Clear the target, for testing.
 119
 120 void
 121 Parameters::clear_target()
 122 {
 123   this->target_ = NULL;
 124   // We need a new Set_parameters_target_once so that we can set the
 125   // target again.
 126   this->set_parameters_target_once_ = new Set_parameters_target_once(this);
 127 }
 128
 129 // Return whether TARGET is compatible with the target we are using.
 130
 131 bool
 132 Parameters::is_compatible_target(const Target* target) const
 133 {
 134   if (this->target_ == NULL)
 135     return true;
 136   return target == this->target_;
 137 }
 138
 139 Parameters::Target_size_endianness
 140 Parameters::size_and_endianness() const
 141 {
 142   if (this->target().get_size() == 32)
 143     {
 144       if (!this->target().is_big_endian())
 145         {
 146 #ifdef HAVE_TARGET_32_LITTLE
 147           return TARGET_32_LITTLE;
 148 #else
 149           gold_unreachable();
 150 #endif
 151         }
 152       else
 153         {
 154 #ifdef HAVE_TARGET_32_BIG
 155           return TARGET_32_BIG;
 156 #else
 157           gold_unreachable();
 158 #endif
 159         }
 160     }
 161   else if (parameters->target().get_size() == 64)
 162     {
 163       if (!parameters->target().is_big_endian())
 164         {
 165 #ifdef HAVE_TARGET_64_LITTLE
 166           return TARGET_64_LITTLE;
 167 #else
 168           gold_unreachable();
 169 #endif
 170         }
 171       else
 172         {
 173 #ifdef HAVE_TARGET_64_BIG
 174           return TARGET_64_BIG;
 175 #else
 176           gold_unreachable();
 177 #endif
 178         }
 179     }
 180   else
 181     gold_unreachable();
 182 }
 183
 184 void
 185 set_parameters_errors(Errors* errors)
 186 { static_parameters.set_errors(errors); }
 187
 188 void
 189 set_parameters_options(const General_options* options)
 190 { static_parameters.set_options(options); }
 191
 192 void
 193 set_parameters_target(Target* target)
 194 {
 195   static_parameters.set_target(target);
 196   target->select_as_default_target();
 197 }
 198
 199 void
 200 set_parameters_doing_static_link(bool doing_static_link)
 201 { static_parameters.set_doing_static_link(doing_static_link); }
 202
 203 // Force the target to be valid by using the default.  Use the
 204 // --oformat option is set; this supports the x86_64 kernel build,
 205 // which converts a binary file to an object file using -r --format
 206 // binary --oformat elf32-i386 foo.o.  Otherwise use the configured
 207 // default.
 208
 209 void
 210 parameters_force_valid_target()
 211 {
 212   if (parameters->target_valid())
 213     return;
 214
 215   gold_assert(parameters->options_valid());
 216   if (parameters->options().user_set_oformat())
 217     {
 218       Target* target = select_target_by_name(parameters->options().oformat());
 219       if (target != NULL)
 220         {
 221           set_parameters_target(target);
 222           return;
 223         }
 224
 225       gold_error(_("unrecognized output format %s"),
 226                  parameters->options().oformat());
 227     }
 228
 229   // The GOLD_DEFAULT_xx macros are defined by the configure script.
 230   Target* target = select_target(elfcpp::GOLD_DEFAULT_MACHINE,
 231                                  GOLD_DEFAULT_SIZE,
 232                                  GOLD_DEFAULT_BIG_ENDIAN,
 233                                  elfcpp::GOLD_DEFAULT_OSABI,
 234                                  0);
 235   gold_assert(target != NULL);
 236   set_parameters_target(target);
 237 }
 238
 239 // Clear the current target, for testing.
 240
 241 void
 242 parameters_clear_target()
 243 {
 244   static_parameters.clear_target();
 245 }
 246
 247 } // End namespace gold.