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 class Target;
  32
  33 // Here we define the Parameters class which simply holds simple
  34 // general parameters which apply to the entire link.  We use a global
  35 // variable for this.  This is in contrast to the General_options
  36 // class, which holds the complete state of position independent
  37 // command line options.  The hope is that Parameters will stay fairly
  38 // simple, so that if this turns into a library it will be clear how
  39 // these parameters should be set.
  40
  41 class Parameters
  42 {
  43  public:
  44   Parameters(Errors*);
  45
  46   // Return the error object.
  47   Errors*
  48   errors() const
  49   { return this->errors_; }
  50
  51   // Whether the options are valid.  This should not normally be
  52   // called, but it is needed by gold_exit.
  53   bool
  54   options_valid() const
  55   { return this->options_valid_; }
  56
  57   // Whether to use threads.
  58   bool
  59   threads() const
  60   {
  61     gold_assert(this->options_valid_);
  62     return this->threads_;
  63   }
  64
  65   // Return the output file name.
  66   const char*
  67   output_file_name() const
  68   {
  69     gold_assert(this->options_valid_);
  70     return this->output_file_name_;
  71   }
  72
  73   // Whether we are generating a regular executable.
  74   bool
  75   output_is_executable() const
  76   {
  77     gold_assert(this->output_file_type_ != OUTPUT_INVALID);
  78     return this->output_file_type_ == OUTPUT_EXECUTABLE;
  79   }
  80
  81   // Whether we are generating a shared library.
  82   bool
  83   output_is_shared() const
  84   {
  85     gold_assert(this->output_file_type_ != OUTPUT_INVALID);
  86     return this->output_file_type_ == OUTPUT_SHARED;
  87   }
  88
  89   // Whether we are generating an object file.
  90   bool
  91   output_is_object() const
  92   {
  93     gold_assert(this->output_file_type_ != OUTPUT_INVALID);
  94     return this->output_file_type_ == OUTPUT_OBJECT;
  95   }
  96
  97   // Whether we are generating position-independent output.
  98   // This is the case when generating either a shared library
  99   // or a regular executable with the --pic-executable option.
 100   // FIXME: support --pic-executable
 101   bool
 102   output_is_position_independent() const
 103   { return output_is_shared(); }
 104
 105   // The target system root directory.  This is NULL if there isn't
 106   // one.
 107   const std::string&
 108   sysroot() const
 109   {
 110     gold_assert(this->options_valid_);
 111     return this->sysroot_;
 112   }
 113
 114   // Whether to strip all symbols.
 115   bool
 116   strip_all() const
 117   {
 118     gold_assert(this->strip_ != STRIP_INVALID);
 119     return this->strip_ == STRIP_ALL;
 120   }
 121
 122   // Whether to strip debugging information.
 123   bool
 124   strip_debug() const
 125   {
 126     gold_assert(this->strip_ != STRIP_INVALID);
 127     return this->strip_ == STRIP_ALL || this->strip_ == STRIP_DEBUG;
 128   }
 129
 130   // Whether to strip debugging information that's not used by gdb.
 131   bool
 132   strip_debug_gdb() const
 133   {
 134     gold_assert(this->strip_ != STRIP_INVALID);
 135     return this->strip_debug() || this->strip_ == STRIP_DEBUG_UNUSED_BY_GDB;
 136   }
 137
 138   // Whether to permit unresolved references from shared libraries.
 139   bool
 140   allow_shlib_undefined() const
 141   {
 142     gold_assert(this->options_valid_);
 143     return this->allow_shlib_undefined_;
 144   }
 145
 146   // Whether we are doing a symbolic link, in which all defined
 147   // symbols are bound locally.
 148   bool
 149   Bsymbolic() const
 150   {
 151     gold_assert(this->options_valid_);
 152     return this->symbolic_;
 153   }
 154
 155   // Whether we should demangle C++ symbols in our log messages.
 156   bool
 157   demangle() const
 158   { return this->demangle_; }
 159
 160   // Whether we should try to detect violations of the One Definition Rule.
 161   bool
 162   detect_odr_violations() const
 163   {
 164     gold_assert(this->options_valid_);
 165     return this->detect_odr_violations_;
 166   }
 167
 168   // The general linker optimization level (-O).
 169   int
 170   optimize() const
 171   {
 172     gold_assert(this->options_valid_);
 173     return this->optimization_level_;
 174   }
 175
 176   // Whether the -E/--export-dynamic flag is set.
 177   bool
 178   export_dynamic() const
 179   {
 180     gold_assert(this->options_valid_);
 181     return this->export_dynamic_;
 182   }
 183
 184   // Return the debug flags.  These are the flags for which we should
 185   // report internal debugging information.
 186   unsigned int
 187   debug() const
 188   {
 189     gold_assert(this->options_valid_);
 190     return this->debug_;
 191   }
 192
 193   // Whether we are doing a static link--a link in which none of the
 194   // input files are shared libraries.  This is only known after we
 195   // have seen all the input files.
 196   bool
 197   doing_static_link() const
 198   {
 199     gold_assert(this->is_doing_static_link_valid_);
 200     return this->doing_static_link_;
 201   }
 202
 203   // Return whether the target field has been set.
 204   bool
 205   is_target_valid() const
 206   { return this->is_target_valid_; }
 207
 208   // The target of the output file we are generating.
 209   Target*
 210   target() const
 211   {
 212     gold_assert(this->is_target_valid_);
 213     return this->target_;
 214   }
 215
 216   // The size of the output file we are generating.  This should
 217   // return 32 or 64.
 218   int
 219   get_size() const
 220   {
 221     gold_assert(this->is_target_valid_);
 222     return this->size_;
 223   }
 224
 225   // Whether the output is big endian.
 226   bool
 227   is_big_endian() const
 228   {
 229     gold_assert(this->is_target_valid_);
 230     return this->is_big_endian_;
 231   }
 232
 233   // Set values recorded from options.
 234   void
 235   set_from_options(const General_options*);
 236
 237   // Set whether we are doing a static link.
 238   void
 239   set_doing_static_link(bool doing_static_link);
 240
 241   // Set the target.
 242   void
 243   set_target(Target* target);
 244
 245  private:
 246   // The types of output files.
 247   enum Output_file_type
 248     {
 249       // Uninitialized.
 250       OUTPUT_INVALID,
 251       // Generating executable.
 252       OUTPUT_EXECUTABLE,
 253       // Generating shared library.
 254       OUTPUT_SHARED,
 255       // Generating object file.
 256       OUTPUT_OBJECT
 257     };
 258
 259   // Which symbols to strip.
 260   enum Strip
 261   {
 262     // Uninitialize.
 263     STRIP_INVALID,
 264     // Don't strip any symbols.
 265     STRIP_NONE,
 266     // Strip all symbols.
 267     STRIP_ALL,
 268     // Strip debugging information.
 269     STRIP_DEBUG,
 270     // Strip debugging information that's not used by gdb (at least <= 6.7)
 271     STRIP_DEBUG_UNUSED_BY_GDB
 272   };
 273
 274   // A pointer to the error handling object.
 275   Errors* errors_;
 276
 277   // Whether the fields set from the options are valid.
 278   bool options_valid_;
 279   // Whether to use threads.
 280   bool threads_;
 281   // The output file name.
 282   const char* output_file_name_;
 283   // The type of the output file.
 284   Output_file_type output_file_type_;
 285   // The target system root directory.
 286   std::string sysroot_;
 287   // Which symbols to strip.
 288   Strip strip_;
 289   // Whether to allow undefined references from shared libraries.
 290   bool allow_shlib_undefined_;
 291   // Whether we are doing a symbolic link.
 292   bool symbolic_;
 293   // Whether we should demangle C++ symbols in our log messages.
 294   bool demangle_;
 295   // Whether we try to detect One Definition Rule violations.
 296   bool detect_odr_violations_;
 297   // The optimization level.
 298   int optimization_level_;
 299   // Whether the -E/--export-dynamic flag is set.
 300   bool export_dynamic_;
 301   // The debug flags.
 302   unsigned int debug_;
 303
 304   // Whether the doing_static_link_ field is valid.
 305   bool is_doing_static_link_valid_;
 306   // Whether we are doing a static link.
 307   bool doing_static_link_;
 308   // Whether the target_ field is valid.
 309   bool is_target_valid_;
 310   // The target.
 311   Target* target_;
 312   // The size of the output file--32 or 64.
 313   int size_;
 314   // Whether the output file is big endian.
 315   bool is_big_endian_;
 316 };
 317
 318 // This is a global variable.
 319 extern const Parameters* parameters;
 320
 321 // Initialize the global variable.
 322 extern void initialize_parameters(Errors*);
 323
 324 // Set the options.
 325 extern void set_parameters_from_options(const General_options*);
 326
 327 // Set the target recorded in the global parameters variable.
 328 extern void set_parameters_target(Target* target);
 329
 330 // Set whether we are doing a static link.
 331 extern void set_parameters_doing_static_link(bool doing_static_link);
 332
 333 // Return whether we are doing a particular debugging type.  The
 334 // argument is one of the flags from debug.h.
 335
 336 inline bool
 337 is_debugging_enabled(unsigned int type)
 338 { return (parameters->debug() & type) != 0; }
 339
 340 } // End namespace gold.
 341
 342 #endif // !defined(GOLD_PARAMETERS_H)