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 "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 }
  49
  50 void
  51 Parameters::set_doing_static_link(bool doing_static_link)
  52 {
  53   gold_assert(!this->doing_static_link_valid_);
  54   this->doing_static_link_ = doing_static_link;
  55   this->doing_static_link_valid_ = true;
  56 }
  57
  58 void
  59 Parameters::set_target(const Target* target)
  60 {
  61   if (!this->target_valid())
  62     this->target_ = target;
  63   else
  64     gold_assert(target == this->target_);
  65 }
  66
  67 // The x86_64 kernel build converts a binary file to an object file
  68 // using -r --format binary --oformat elf32-i386 foo.o.  In order to
  69 // support that for gold we support determining the default target
  70 // choice from the output format.  We recognize names that the GNU
  71 // linker uses.
  72
  73 const Target&
  74 Parameters::default_target() const
  75 {
  76   gold_assert(this->options_valid());
  77   if (this->options().user_set_oformat())
  78     {
  79       const Target* target
  80           = select_target_by_name(this->options().oformat());
  81       if (target != NULL)
  82         return *target;
  83
  84       gold_error(_("unrecognized output format %s"),
  85                  this->options().oformat());
  86     }
  87
  88   // The GOLD_DEFAULT_xx macros are defined by the configure script.
  89   const Target* target = select_target(elfcpp::GOLD_DEFAULT_MACHINE,
  90                                        GOLD_DEFAULT_SIZE,
  91                                        GOLD_DEFAULT_BIG_ENDIAN,
  92                                        0, 0);
  93   gold_assert(target != NULL);
  94   return *target;
  95 }
  96
  97 Parameters::Target_size_endianness
  98 Parameters::size_and_endianness() const
  99 {
 100   if (this->target().get_size() == 32)
 101     {
 102       if (!this->target().is_big_endian())
 103         {
 104 #ifdef HAVE_TARGET_32_LITTLE
 105           return TARGET_32_LITTLE;
 106 #else
 107           gold_unreachable();
 108 #endif
 109         }
 110       else
 111         {
 112 #ifdef HAVE_TARGET_32_BIG
 113           return TARGET_32_BIG;
 114 #else
 115           gold_unreachable();
 116 #endif
 117         }
 118     }
 119   else if (parameters->target().get_size() == 64)
 120     {
 121       if (!parameters->target().is_big_endian())
 122         {
 123 #ifdef HAVE_TARGET_64_LITTLE
 124           return TARGET_64_LITTLE;
 125 #else
 126           gold_unreachable();
 127 #endif
 128         }
 129       else
 130         {
 131 #ifdef HAVE_TARGET_64_BIG
 132           return TARGET_64_BIG;
 133 #else
 134           gold_unreachable();
 135 #endif
 136         }
 137     }
 138   else
 139     gold_unreachable();
 140 }
 141
 142
 143 // Our local version of the variable, which is not const.
 144
 145 static Parameters static_parameters;
 146
 147 // The global variable.
 148
 149 const Parameters* parameters = &static_parameters;
 150
 151 void
 152 set_parameters_errors(Errors* errors)
 153 { static_parameters.set_errors(errors); }
 154
 155 void
 156 set_parameters_options(const General_options* options)
 157 { static_parameters.set_options(options); }
 158
 159 void
 160 set_parameters_target(const Target* target)
 161 { static_parameters.set_target(target); }
 162
 163 void
 164 set_parameters_doing_static_link(bool doing_static_link)
 165 { static_parameters.set_doing_static_link(doing_static_link); }
 166
 167 } // End namespace gold.