gold/parameters.cc

   1 // parameters.cc -- general parameters for a link using gold
   2
   3 // Copyright 2006, 2007 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 "options.h"
  26 #include "target.h"
  27 #include "target-select.h"
  28
  29 namespace gold
  30 {
  31
  32 void
  33 Parameters::set_errors(Errors* errors)
  34 {
  35   gold_assert(this->errors_ == NULL);
  36   this->errors_ = errors;
  37 }
  38
  39 void
  40 Parameters::set_options(const General_options* options)
  41 {
  42   gold_assert(!this->options_valid());
  43   this->options_ = options;
  44   // For speed, we make our own copy of the debug variable.
  45   this->debug_ = this->options().debug();
  46 }
  47
  48 void
  49 Parameters::set_doing_static_link(bool doing_static_link)
  50 {
  51   gold_assert(!this->doing_static_link_valid_);
  52   this->doing_static_link_ = doing_static_link;
  53   this->doing_static_link_valid_ = true;
  54 }
  55
  56 void
  57 Parameters::set_target(const Target* target)
  58 {
  59   if (!this->target_valid())
  60     this->target_ = target;
  61   else
  62     gold_assert(target == this->target_);
  63 }
  64
  65 // The x86_64 kernel build converts a binary file to an object file
  66 // using -r --format binary --oformat elf32-i386 foo.o.  In order to
  67 // support that for gold we support determining the default target
  68 // choice from the output format.  We recognize names that the GNU
  69 // linker uses.
  70
  71 const Target&
  72 Parameters::default_target() const
  73 {
  74   gold_assert(this->options_valid());
  75   if (this->options().oformat_string() != NULL)
  76     {
  77       const Target* target
  78           = select_target_by_name(this->options().oformat_string());
  79       if (target != NULL)
  80         return *target;
  81
  82       gold_error(_("unrecognized output format %s"),
  83                  this->options().oformat_string());
  84     }
  85
  86   // The GOLD_DEFAULT_xx macros are defined by the configure script.
  87   const Target* target = select_target(elfcpp::GOLD_DEFAULT_MACHINE,
  88                                        GOLD_DEFAULT_SIZE,
  89                                        GOLD_DEFAULT_BIG_ENDIAN,
  90                                        0, 0);
  91   gold_assert(target != NULL);
  92   return *target;
  93 }
  94
  95 Parameters::Target_size_endianness
  96 Parameters::size_and_endianness() const
  97 {
  98   if (this->target().get_size() == 32)
  99     {
 100       if (!this->target().is_big_endian())
 101         {
 102 #ifdef HAVE_TARGET_32_LITTLE
 103           return TARGET_32_LITTLE;
 104 #else
 105           gold_unreachable();
 106 #endif
 107         }
 108       else
 109         {
 110 #ifdef HAVE_TARGET_32_BIG
 111           return TARGET_32_BIG;
 112 #else
 113           gold_unreachable();
 114 #endif
 115         }
 116     }
 117   else if (parameters->target().get_size() == 64)
 118     {
 119       if (!parameters->target().is_big_endian())
 120         {
 121 #ifdef HAVE_TARGET_64_LITTLE
 122           return TARGET_64_LITTLE;
 123 #else
 124           gold_unreachable();
 125 #endif
 126         }
 127       else
 128         {
 129 #ifdef HAVE_TARGET_64_BIG
 130           return TARGET_64_BIG;
 131 #else
 132           gold_unreachable();
 133 #endif
 134         }
 135     }
 136   else
 137     gold_unreachable();
 138 }
 139
 140
 141 // Our local version of the variable, which is not const.
 142
 143 static Parameters static_parameters;
 144
 145 // The global variable.
 146
 147 const Parameters* parameters = &static_parameters;
 148
 149 void
 150 set_parameters_errors(Errors* errors)
 151 { static_parameters.set_errors(errors); }
 152
 153 void
 154 set_parameters_options(const General_options* options)
 155 { static_parameters.set_options(options); }
 156
 157 void
 158 set_parameters_target(const Target* target)
 159 { static_parameters.set_target(target); }
 160
 161 void
 162 set_parameters_doing_static_link(bool doing_static_link)
 163 { static_parameters.set_doing_static_link(doing_static_link); }
 164
 165 } // End namespace gold.