gold/parameters.h

   1 // parameters.h -- general parameters for a link using gold  -*- C++ -*-
   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 #ifndef GOLD_PARAMETERS_H
  24 #define GOLD_PARAMETERS_H
  25
  26 namespace gold
  27 {
  28
  29 class General_options;
  30 class Errors;
  31
  32 // Here we define the Parameters class which simply holds simple
  33 // general parameters which apply to the entire link.  We use a global
  34 // variable for this.  This is in contrast to the General_options
  35 // class, which holds the complete state of position independent
  36 // command line options.  The hope is that Parameters will stay fairly
  37 // simple, so that if this turns into a library it will be clear how
  38 // these parameters should be set.
  39
  40 class Parameters
  41 {
  42  public:
  43   Parameters(Errors*);
  44
  45   // Return the error object.
  46   Errors*
  47   errors() const
  48   { return this->errors_; }
  49
  50   // Return the output file name.
  51   const char*
  52   output_file_name() const
  53   {
  54     gold_assert(this->options_valid_);
  55     return this->output_file_name_;
  56   }
  57
  58   // Whether we are generating a regular executable.
  59   bool
  60   output_is_executable() const
  61   {
  62     gold_assert(this->output_file_type_ != OUTPUT_INVALID);
  63     return this->output_file_type_ == OUTPUT_EXECUTABLE;
  64   }
  65
  66   // Whether we are generating a shared library.
  67   bool
  68   output_is_shared() const
  69   {
  70     gold_assert(this->output_file_type_ != OUTPUT_INVALID);
  71     return this->output_file_type_ == OUTPUT_SHARED;
  72   }
  73
  74   // Whether we are generating an object file.
  75   bool
  76   output_is_object() const
  77   {
  78     gold_assert(this->output_file_type_ != OUTPUT_INVALID);
  79     return this->output_file_type_ == OUTPUT_OBJECT;
  80   }
  81
  82   // Whether we are generating position-independent output.
  83   // This is the case when generating either a shared library
  84   // or a regular executable with the --pic-executable option.
  85   // FIXME: support --pic-executable
  86   bool
  87   output_is_position_independent() const
  88   { return output_is_shared(); }
  89
  90   // The target system root directory.  This is NULL if there isn't
  91   // one.
  92   const std::string&
  93   sysroot() const
  94   {
  95     gold_assert(this->options_valid_);
  96     return this->sysroot_;
  97   }
  98
  99   // Whether to strip all symbols.
 100   bool
 101   strip_all() const
 102   {
 103     gold_assert(this->strip_ != STRIP_INVALID);
 104     return this->strip_ == STRIP_ALL;
 105   }
 106
 107   // Whether to strip debugging information.
 108   bool
 109   strip_debug() const
 110   {
 111     gold_assert(this->strip_ != STRIP_INVALID);
 112     return this->strip_ == STRIP_ALL || this->strip_ == STRIP_DEBUG;
 113   }
 114
 115   // Whether to permit unresolved references from shared libraries.
 116   bool
 117   allow_shlib_undefined() const
 118   {
 119     gold_assert(this->options_valid_);
 120     return this->allow_shlib_undefined_;
 121   }
 122
 123   // Whether we are doing a symbolic link, in which all defined
 124   // symbols are bound locally.
 125   bool
 126   symbolic() const
 127   {
 128     gold_assert(this->options_valid_);
 129     return this->symbolic_;
 130   }
 131
 132   // Whether we should try to detect violations of the One Definition Rule.
 133   bool
 134   detect_odr_violations() const
 135   {
 136     gold_assert(this->options_valid_);
 137     return this->detect_odr_violations_;
 138   }
 139
 140   // The general linker optimization level.
 141   int
 142   optimization_level() const
 143   {
 144     gold_assert(this->options_valid_);
 145     return this->optimization_level_;
 146   }
 147
 148   // Whether the -E/--export-dynamic flag is set.
 149   bool
 150   export_dynamic() const
 151   {
 152     gold_assert(this->options_valid_);
 153     return this->export_dynamic_;
 154   }
 155
 156   // Whether we are doing a static link--a link in which none of the
 157   // input files are shared libraries.  This is only known after we
 158   // have seen all the input files.
 159   bool
 160   doing_static_link() const
 161   {
 162     gold_assert(this->is_doing_static_link_valid_);
 163     return this->doing_static_link_;
 164   }
 165
 166   // The size of the output file we are generating.  This should
 167   // return 32 or 64.
 168   int
 169   get_size() const
 170   {
 171     gold_assert(this->is_size_and_endian_valid_);
 172     return this->size_;
 173   }
 174
 175   // Whether the output is big endian.
 176   bool
 177   is_big_endian() const
 178   {
 179     gold_assert(this->is_size_and_endian_valid_);
 180     return this->is_big_endian_;
 181   }
 182
 183   // Set values recorded from options.
 184   void
 185   set_from_options(const General_options*);
 186
 187   // Set whether we are doing a static link.
 188   void
 189   set_doing_static_link(bool doing_static_link);
 190
 191   // Set the size and endianness.
 192   void
 193   set_size_and_endianness(int size, bool is_big_endian);
 194
 195  private:
 196   // The types of output files.
 197   enum Output_file_type
 198     {
 199       // Uninitialized.
 200       OUTPUT_INVALID,
 201       // Generating executable.
 202       OUTPUT_EXECUTABLE,
 203       // Generating shared library.
 204       OUTPUT_SHARED,
 205       // Generating object file.
 206       OUTPUT_OBJECT
 207     };
 208
 209   // Which symbols to strip.
 210   enum Strip
 211   {
 212     // Uninitialize.
 213     STRIP_INVALID,
 214     // Don't strip any symbols.
 215     STRIP_NONE,
 216     // Strip all symbols.
 217     STRIP_ALL,
 218     // Strip debugging information.
 219     STRIP_DEBUG
 220   };
 221
 222   // A pointer to the error handling object.
 223   Errors* errors_;
 224
 225   // Whether the fields set from the options are valid.
 226   bool options_valid_;
 227   // The output file name.
 228   const char* output_file_name_;
 229   // The type of the output file.
 230   Output_file_type output_file_type_;
 231   // The target system root directory.
 232   std::string sysroot_;
 233   // Which symbols to strip.
 234   Strip strip_;
 235   // Whether to allow undefined references from shared libraries.
 236   bool allow_shlib_undefined_;
 237   // Whether we are doing a symbolic link.
 238   bool symbolic_;
 239   // Whether we try to detect One Definition Rule violations.
 240   bool detect_odr_violations_;
 241   // The optimization level.
 242   int optimization_level_;
 243   // Whether the -E/--export-dynamic flag is set.
 244   bool export_dynamic_;
 245
 246   // Whether the doing_static_link_ field is valid.
 247   bool is_doing_static_link_valid_;
 248   // Whether we are doing a static link.
 249   bool doing_static_link_;
 250   // Whether the size_ and is_big_endian_ fields are valid.
 251   bool is_size_and_endian_valid_;
 252   // The size of the output file--32 or 64.
 253   int size_;
 254   // Whether the output file is big endian.
 255   bool is_big_endian_;
 256 };
 257
 258 // This is a global variable.
 259 extern const Parameters* parameters;
 260
 261 // Initialize the global variable.
 262 extern void initialize_parameters(Errors*);
 263
 264 // Set the options.
 265 extern void set_parameters_from_options(const General_options*);
 266
 267 // Set the size and endianness of the global parameters variable.
 268 extern void set_parameters_size_and_endianness(int size, bool is_big_endian);
 269
 270 // Set whether we are doing a static link.
 271 extern void set_parameters_doing_static_link(bool doing_static_link);
 272
 273 } // End namespace gold.
 274
 275 #endif // !defined(GOLD_PARAMETERS_H)