gold/parameters.cc

   1 // parameters.cc -- general parameters for a link using gold
   2
   3 // Copyright 2006, 2007, 2008 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 void
  34 Parameters::set_errors(Errors* errors)
  35 {
  36   gold_assert(this->errors_ == NULL);
  37   this->errors_ = errors;
  38 }
  39
  40 void
  41 Parameters::set_options(const General_options* options)
  42 {
  43   gold_assert(!this->options_valid());
  44   this->options_ = options;
  45   // For speed, we convert the options() debug var from a string to an
  46   // enum (from debug.h).
  47   this->debug_ = debug_string_to_enum(this->options().debug());
  48   // If --verbose is set, it acts as "--debug=files".
  49   if (options->verbose())
  50     this->debug_ |= DEBUG_FILES;
  51 }
  52
  53 void
  54 Parameters::set_doing_static_link(bool doing_static_link)
  55 {
  56   gold_assert(!this->doing_static_link_valid_);
  57   this->doing_static_link_ = doing_static_link;
  58   this->doing_static_link_valid_ = true;
  59 }
  60
  61 void
  62 Parameters::set_target(Target* target)
  63 {
  64   if (!this->target_valid())
  65     this->target_ = target;
  66   else
  67     gold_assert(target == this->target_);
  68 }
  69
  70 // Return whether TARGET is compatible with the target we are using.
  71
  72 bool
  73 Parameters::is_compatible_target(const Target* target) const
  74 {
  75   if (this->target_ == NULL)
  76     return true;
  77   return target == this->target_;
  78 }
  79
  80 Parameters::Target_size_endianness
  81 Parameters::size_and_endianness() const
  82 {
  83   if (this->target().get_size() == 32)
  84     {
  85       if (!this->target().is_big_endian())
  86         {
  87 #ifdef HAVE_TARGET_32_LITTLE
  88           return TARGET_32_LITTLE;
  89 #else
  90           gold_unreachable();
  91 #endif
  92         }
  93       else
  94         {
  95 #ifdef HAVE_TARGET_32_BIG
  96           return TARGET_32_BIG;
  97 #else
  98           gold_unreachable();
  99 #endif
 100         }
 101     }
 102   else if (parameters->target().get_size() == 64)
 103     {
 104       if (!parameters->target().is_big_endian())
 105         {
 106 #ifdef HAVE_TARGET_64_LITTLE
 107           return TARGET_64_LITTLE;
 108 #else
 109           gold_unreachable();
 110 #endif
 111         }
 112       else
 113         {
 114 #ifdef HAVE_TARGET_64_BIG
 115           return TARGET_64_BIG;
 116 #else
 117           gold_unreachable();
 118 #endif
 119         }
 120     }
 121   else
 122     gold_unreachable();
 123 }
 124
 125
 126 // Our local version of the variable, which is not const.
 127
 128 static Parameters static_parameters;
 129
 130 // The global variable.
 131
 132 const Parameters* parameters = &static_parameters;
 133
 134 void
 135 set_parameters_errors(Errors* errors)
 136 { static_parameters.set_errors(errors); }
 137
 138 void
 139 set_parameters_options(const General_options* options)
 140 { static_parameters.set_options(options); }
 141
 142 void
 143 set_parameters_target(Target* target)
 144 { static_parameters.set_target(target); }
 145
 146 void
 147 set_parameters_doing_static_link(bool doing_static_link)
 148 { static_parameters.set_doing_static_link(doing_static_link); }
 149
 150 // Force the target to be valid by using the default.  Use the
 151 // --oformat option is set; this supports the x86_64 kernel build,
 152 // which converts a binary file to an object file using -r --format
 153 // binary --oformat elf32-i386 foo.o.  Otherwise use the configured
 154 // default.
 155
 156 void
 157 parameters_force_valid_target()
 158 {
 159   if (parameters->target_valid())
 160     return;
 161
 162   gold_assert(parameters->options_valid());
 163   if (parameters->options().user_set_oformat())
 164     {
 165       Target* target = select_target_by_name(parameters->options().oformat());
 166       if (target != NULL)
 167         {
 168           set_parameters_target(target);
 169           return;
 170         }
 171
 172       gold_error(_("unrecognized output format %s"),
 173                  parameters->options().oformat());
 174     }
 175
 176   // The GOLD_DEFAULT_xx macros are defined by the configure script.
 177   Target* target = select_target(elfcpp::GOLD_DEFAULT_MACHINE,
 178                                  GOLD_DEFAULT_SIZE,
 179                                  GOLD_DEFAULT_BIG_ENDIAN,
 180                                  elfcpp::GOLD_DEFAULT_OSABI,
 181                                  0);
 182   gold_assert(target != NULL);
 183   set_parameters_target(target);
 184 }
 185
 186 // Clear the current target, for testing.
 187
 188 void
 189 parameters_clear_target()
 190 {
 191   static_parameters.clear_target();
 192 }
 193
 194 } // End namespace gold.