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(const Target* target)
  63 {
  64   if (!this->target_valid())
  65     this->target_ = target;
  66   else
  67     gold_assert(target == this->target_);
  68 }
  69
  70 // The x86_64 kernel build converts a binary file to an object file
  71 // using -r --format binary --oformat elf32-i386 foo.o.  In order to
  72 // support that for gold we support determining the default target
  73 // choice from the output format.  We recognize names that the GNU
  74 // linker uses.
  75
  76 const Target&
  77 Parameters::default_target() const
  78 {
  79   gold_assert(this->options_valid());
  80   if (this->options().user_set_oformat())
  81     {
  82       const Target* target
  83           = select_target_by_name(this->options().oformat());
  84       if (target != NULL)
  85         return *target;
  86
  87       gold_error(_("unrecognized output format %s"),
  88                  this->options().oformat());
  89     }
  90
  91   // The GOLD_DEFAULT_xx macros are defined by the configure script.
  92   const Target* target = select_target(elfcpp::GOLD_DEFAULT_MACHINE,
  93                                        GOLD_DEFAULT_SIZE,
  94                                        GOLD_DEFAULT_BIG_ENDIAN,
  95                                        elfcpp::GOLD_DEFAULT_OSABI,
  96                                        0);
  97   gold_assert(target != NULL);
  98   return *target;
  99 }
 100
 101 // Return whether TARGET is compatible with the target we are using.
 102
 103 bool
 104 Parameters::is_compatible_target(const Target* target) const
 105 {
 106   if (this->target_ == NULL)
 107     return true;
 108   return target == this->target_;
 109 }
 110
 111 Parameters::Target_size_endianness
 112 Parameters::size_and_endianness() const
 113 {
 114   if (this->target().get_size() == 32)
 115     {
 116       if (!this->target().is_big_endian())
 117         {
 118 #ifdef HAVE_TARGET_32_LITTLE
 119           return TARGET_32_LITTLE;
 120 #else
 121           gold_unreachable();
 122 #endif
 123         }
 124       else
 125         {
 126 #ifdef HAVE_TARGET_32_BIG
 127           return TARGET_32_BIG;
 128 #else
 129           gold_unreachable();
 130 #endif
 131         }
 132     }
 133   else if (parameters->target().get_size() == 64)
 134     {
 135       if (!parameters->target().is_big_endian())
 136         {
 137 #ifdef HAVE_TARGET_64_LITTLE
 138           return TARGET_64_LITTLE;
 139 #else
 140           gold_unreachable();
 141 #endif
 142         }
 143       else
 144         {
 145 #ifdef HAVE_TARGET_64_BIG
 146           return TARGET_64_BIG;
 147 #else
 148           gold_unreachable();
 149 #endif
 150         }
 151     }
 152   else
 153     gold_unreachable();
 154 }
 155
 156
 157 // Our local version of the variable, which is not const.
 158
 159 static Parameters static_parameters;
 160
 161 // The global variable.
 162
 163 const Parameters* parameters = &static_parameters;
 164
 165 void
 166 set_parameters_errors(Errors* errors)
 167 { static_parameters.set_errors(errors); }
 168
 169 void
 170 set_parameters_options(const General_options* options)
 171 { static_parameters.set_options(options); }
 172
 173 void
 174 set_parameters_target(const Target* target)
 175 { static_parameters.set_target(target); }
 176
 177 void
 178 set_parameters_doing_static_link(bool doing_static_link)
 179 { static_parameters.set_doing_static_link(doing_static_link); }
 180
 181 } // End namespace gold.