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   // Whether to use threads.
  51   bool
  52   threads() const
  53   {
  54     gold_assert(this->options_valid_);
  55     return this->threads_;
  56   }
  57
  58   // Return the output file name.
  59   const char*
  60   output_file_name() const
  61   {
  62     gold_assert(this->options_valid_);
  63     return this->output_file_name_;
  64   }
  65
  66   // Whether we are generating a regular executable.
  67   bool
  68   output_is_executable() const
  69   {
  70     gold_assert(this->output_file_type_ != OUTPUT_INVALID);
  71     return this->output_file_type_ == OUTPUT_EXECUTABLE;
  72   }
  73
  74   // Whether we are generating a shared library.
  75   bool
  76   output_is_shared() const
  77   {
  78     gold_assert(this->output_file_type_ != OUTPUT_INVALID);
  79     return this->output_file_type_ == OUTPUT_SHARED;
  80   }
  81
  82   // Whether we are generating an object file.
  83   bool
  84   output_is_object() const
  85   {
  86     gold_assert(this->output_file_type_ != OUTPUT_INVALID);
  87     return this->output_file_type_ == OUTPUT_OBJECT;
  88   }
  89
  90   // Whether we are generating position-independent output.
  91   // This is the case when generating either a shared library
  92   // or a regular executable with the --pic-executable option.
  93   // FIXME: support --pic-executable
  94   bool
  95   output_is_position_independent() const
  96   { return output_is_shared(); }
  97
  98   // The target system root directory.  This is NULL if there isn't
  99   // one.
 100   const std::string&
 101   sysroot() const
 102   {
 103     gold_assert(this->options_valid_);
 104     return this->sysroot_;
 105   }
 106
 107   // Whether to strip all symbols.
 108   bool
 109   strip_all() const
 110   {
 111     gold_assert(this->strip_ != STRIP_INVALID);
 112     return this->strip_ == STRIP_ALL;
 113   }
 114
 115   // Whether to strip debugging information.
 116   bool
 117   strip_debug() const
 118   {
 119     gold_assert(this->strip_ != STRIP_INVALID);
 120     return this->strip_ == STRIP_ALL || this->strip_ == STRIP_DEBUG;
 121   }
 122
 123   // Whether to strip debugging information that's not used by gdb.
 124   bool
 125   strip_debug_gdb() const
 126   {
 127     gold_assert(this->strip_ != STRIP_INVALID);
 128     return this->strip_debug() || this->strip_ == STRIP_DEBUG_UNUSED_BY_GDB;
 129   }
 130
 131   // Whether to permit unresolved references from shared libraries.
 132   bool
 133   allow_shlib_undefined() const
 134   {
 135     gold_assert(this->options_valid_);
 136     return this->allow_shlib_undefined_;
 137   }
 138
 139   // Whether we are doing a symbolic link, in which all defined
 140   // symbols are bound locally.
 141   bool
 142   symbolic() const
 143   {
 144     gold_assert(this->options_valid_);
 145     return this->symbolic_;
 146   }
 147
 148   // Whether we should demangle C++ symbols in our log messages.
 149   bool
 150   demangle() const
 151   { return this->demangle_; }
 152
 153   // Whether we should try to detect violations of the One Definition Rule.
 154   bool
 155   detect_odr_violations() const
 156   {
 157     gold_assert(this->options_valid_);
 158     return this->detect_odr_violations_;
 159   }
 160
 161   // The general linker optimization level.
 162   int
 163   optimization_level() const
 164   {
 165     gold_assert(this->options_valid_);
 166     return this->optimization_level_;
 167   }
 168
 169   // Whether the -E/--export-dynamic flag is set.
 170   bool
 171   export_dynamic() const
 172   {
 173     gold_assert(this->options_valid_);
 174     return this->export_dynamic_;
 175   }
 176
 177   // Return the debug flags.  These are the flags for which we should
 178   // report internal debugging information.
 179   unsigned int
 180   debug() const
 181   {
 182     gold_assert(this->options_valid_);
 183     return this->debug_;
 184   }
 185
 186   // Whether we are doing a static link--a link in which none of the
 187   // input files are shared libraries.  This is only known after we
 188   // have seen all the input files.
 189   bool
 190   doing_static_link() const
 191   {
 192     gold_assert(this->is_doing_static_link_valid_);
 193     return this->doing_static_link_;
 194   }
 195
 196   // The size of the output file we are generating.  This should
 197   // return 32 or 64.
 198   int
 199   get_size() const
 200   {
 201     gold_assert(this->is_size_and_endian_valid_);
 202     return this->size_;
 203   }
 204
 205   // Whether the output is big endian.
 206   bool
 207   is_big_endian() const
 208   {
 209     gold_assert(this->is_size_and_endian_valid_);
 210     return this->is_big_endian_;
 211   }
 212
 213   // Set values recorded from options.
 214   void
 215   set_from_options(const General_options*);
 216
 217   // Set whether we are doing a static link.
 218   void
 219   set_doing_static_link(bool doing_static_link);
 220
 221   // Set the size and endianness.
 222   void
 223   set_size_and_endianness(int size, bool is_big_endian);
 224
 225  private:
 226   // The types of output files.
 227   enum Output_file_type
 228     {
 229       // Uninitialized.
 230       OUTPUT_INVALID,
 231       // Generating executable.
 232       OUTPUT_EXECUTABLE,
 233       // Generating shared library.
 234       OUTPUT_SHARED,
 235       // Generating object file.
 236       OUTPUT_OBJECT
 237     };
 238
 239   // Which symbols to strip.
 240   enum Strip
 241   {
 242     // Uninitialize.
 243     STRIP_INVALID,
 244     // Don't strip any symbols.
 245     STRIP_NONE,
 246     // Strip all symbols.
 247     STRIP_ALL,
 248     // Strip debugging information.
 249     STRIP_DEBUG,
 250     // Strip debugging information that's not used by gdb (at least <= 6.7)
 251     STRIP_DEBUG_UNUSED_BY_GDB
 252   };
 253
 254   // A pointer to the error handling object.
 255   Errors* errors_;
 256
 257   // Whether the fields set from the options are valid.
 258   bool options_valid_;
 259   // Whether to use threads.
 260   bool threads_;
 261   // The output file name.
 262   const char* output_file_name_;
 263   // The type of the output file.
 264   Output_file_type output_file_type_;
 265   // The target system root directory.
 266   std::string sysroot_;
 267   // Which symbols to strip.
 268   Strip strip_;
 269   // Whether to allow undefined references from shared libraries.
 270   bool allow_shlib_undefined_;
 271   // Whether we are doing a symbolic link.
 272   bool symbolic_;
 273   // Whether we should demangle C++ symbols in our log messages.
 274   bool demangle_;
 275   // Whether we try to detect One Definition Rule violations.
 276   bool detect_odr_violations_;
 277   // The optimization level.
 278   int optimization_level_;
 279   // Whether the -E/--export-dynamic flag is set.
 280   bool export_dynamic_;
 281   // The debug flags.
 282   unsigned int debug_;
 283
 284   // Whether the doing_static_link_ field is valid.
 285   bool is_doing_static_link_valid_;
 286   // Whether we are doing a static link.
 287   bool doing_static_link_;
 288   // Whether the size_ and is_big_endian_ fields are valid.
 289   bool is_size_and_endian_valid_;
 290   // The size of the output file--32 or 64.
 291   int size_;
 292   // Whether the output file is big endian.
 293   bool is_big_endian_;
 294 };
 295
 296 // This is a global variable.
 297 extern const Parameters* parameters;
 298
 299 // Initialize the global variable.
 300 extern void initialize_parameters(Errors*);
 301
 302 // Set the options.
 303 extern void set_parameters_from_options(const General_options*);
 304
 305 // Set the size and endianness of the global parameters variable.
 306 extern void set_parameters_size_and_endianness(int size, bool is_big_endian);
 307
 308 // Set whether we are doing a static link.
 309 extern void set_parameters_doing_static_link(bool doing_static_link);
 310
 311 // Return whether we are doing a particular debugging type.  The
 312 // argument is one of the flags from debug.h.
 313
 314 inline bool
 315 is_debugging_enabled(unsigned int type)
 316 { return (parameters->debug() & type) != 0; }
 317
 318 } // End namespace gold.
 319
 320 #endif // !defined(GOLD_PARAMETERS_H)