gold/options.h

   1 // options.h -- handle command line options for 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 // Command_line
  24 //   Holds everything we get from the command line.
  25 // General_options (from Command_line::options())
  26 //   Options which are not position dependent.
  27 // Input_argument (from Command_line::inputs())
  28 //   The list of input files, including -l options.
  29 // Position_dependent_options (from Input_argument::options())
  30 //   Position dependent options which apply to this argument.
  31
  32 #ifndef GOLD_OPTIONS_H
  33 #define GOLD_OPTIONS_H
  34
  35 #include <cstdlib>
  36 #include <list>
  37 #include <string>
  38 #include <vector>
  39
  40 namespace gold
  41 {
  42
  43 class Command_line;
  44 class Input_file_group;
  45
  46 namespace options {
  47
  48 class Command_line_options;
  49 struct One_option;
  50
  51 } // End namespace gold::options.
  52
  53 // A directory to search.  For each directory we record whether it is
  54 // in the sysroot.  We need to know this so that, if a linker script
  55 // is found within the sysroot, we will apply the sysroot to any files
  56 // named by that script.
  57
  58 class Search_directory
  59 {
  60  public:
  61   // We need a default constructor because we put this in a
  62   // std::vector.
  63   Search_directory()
  64     : name_(NULL), put_in_sysroot_(false), is_in_sysroot_(false)
  65   { }
  66
  67   // This is the usual constructor.
  68   Search_directory(const char* name, bool put_in_sysroot)
  69     : name_(name), put_in_sysroot_(put_in_sysroot), is_in_sysroot_(false)
  70   { gold_assert(!this->name_.empty()); }
  71
  72   // This is called if we have a sysroot.  The sysroot is prefixed to
  73   // any entries for which put_in_sysroot_ is true.  is_in_sysroot_ is
  74   // set to true for any enries which are in the sysroot (this will
  75   // naturally include any entries for which put_in_sysroot_ is true).
  76   // SYSROOT is the sysroot, CANONICAL_SYSROOT is the result of
  77   // passing SYSROOT to lrealpath.
  78   void
  79   add_sysroot(const char* sysroot, const char* canonical_sysroot);
  80
  81   // Get the directory name.
  82   const std::string&
  83   name() const
  84   { return this->name_; }
  85
  86   // Return whether this directory is in the sysroot.
  87   bool
  88   is_in_sysroot() const
  89   { return this->is_in_sysroot_; }
  90
  91  private:
  92   std::string name_;
  93   bool put_in_sysroot_;
  94   bool is_in_sysroot_;
  95 };
  96
  97 // The position independent options which apply to the whole link.
  98 // There are a lot of them.
  99
 100 class General_options
 101 {
 102  public:
 103   General_options();
 104
 105   // -E: export dynamic symbols.
 106   bool
 107   export_dynamic() const
 108   { return this->export_dynamic_; }
 109
 110   // -I: dynamic linker name.
 111   const char*
 112   dynamic_linker() const
 113   { return this->dynamic_linker_; }
 114
 115   // -L: Library search path.
 116   typedef std::vector<Search_directory> Dir_list;
 117
 118   const Dir_list&
 119   search_path() const
 120   { return this->search_path_; }
 121
 122   // -O: optimization level (0: don't try to optimize output size).
 123   int
 124   optimization_level() const
 125   { return this->optimization_level_; }
 126
 127   // -o: Output file name.
 128   const char*
 129   output_file_name() const
 130   { return this->output_file_name_; }
 131
 132   // -r: Whether we are doing a relocatable link.
 133   bool
 134   is_relocatable() const
 135   { return this->is_relocatable_; }
 136
 137   // -s: Strip all symbols.
 138   bool
 139   strip_all() const
 140   { return this->strip_ == STRIP_ALL; }
 141
 142   // -S: Strip debugging information.
 143   bool
 144   strip_debug() const
 145   { return this->strip_ == STRIP_ALL || this->strip_ == STRIP_DEBUG; }
 146
 147   // --eh-frame-hdr: Whether to generate an exception frame header.
 148   bool
 149   create_eh_frame_hdr() const
 150   { return this->create_eh_frame_hdr_; }
 151
 152   // --rpath: The runtime search path.
 153   const Dir_list&
 154   rpath() const
 155   { return this->rpath_; }
 156
 157   // --rpath-link: The link time search patch for shared libraries.
 158   const Dir_list&
 159   rpath_link() const
 160   { return this->rpath_link_; }
 161
 162   // --shared: Whether generating a shared object.
 163   bool
 164   is_shared() const
 165   { return this->is_shared_; }
 166
 167   // --static: Whether doing a static link.
 168   bool
 169   is_static() const
 170   { return this->is_static_; }
 171
 172   // --stats: Print resource usage statistics.
 173   bool
 174   print_stats() const
 175   { return this->print_stats_; }
 176
 177   // --sysroot: The system root of a cross-linker.
 178   const std::string&
 179   sysroot() const
 180   { return this->sysroot_; }
 181
 182   // -Ttext: The address of the .text section
 183   uint64_t
 184   text_segment_address() const
 185   { return this->text_segment_address_; }
 186
 187   // Whether -Ttext was used.
 188   bool
 189   user_set_text_segment_address() const
 190   { return this->text_segment_address_ != -1U; }
 191
 192   // --threads: Whether to use threads.
 193   bool
 194   threads() const
 195   { return this->threads_; }
 196
 197   // --thread-count-initial: Threads to use in initial pass.
 198   int
 199   thread_count_initial() const
 200   { return this->thread_count_initial_; }
 201
 202   // --thread-count-middle: Threads to use in middle pass.
 203   int
 204   thread_count_middle() const
 205   { return this->thread_count_middle_; }
 206
 207   // --thread-count-final: Threads to use in final pass.
 208   int
 209   thread_count_final() const
 210   { return this->thread_count_final_; }
 211
 212  private:
 213   // Don't copy this structure.
 214   General_options(const General_options&);
 215   General_options& operator=(const General_options&);
 216
 217   friend class Command_line;
 218   friend class options::Command_line_options;
 219
 220   // Which symbols to strip.
 221   enum Strip
 222   {
 223     // Don't strip any symbols.
 224     STRIP_NONE,
 225     // Strip all symbols.
 226     STRIP_ALL,
 227     // Strip debugging information.
 228     STRIP_DEBUG
 229   };
 230
 231   void
 232   set_export_dynamic()
 233   { this->export_dynamic_ = true; }
 234
 235   void
 236   set_dynamic_linker(const char* arg)
 237   { this->dynamic_linker_ = arg; }
 238
 239   void
 240   add_to_search_path(const char* arg)
 241   { this->search_path_.push_back(Search_directory(arg, false)); }
 242
 243   void
 244   add_to_search_path_with_sysroot(const char* arg)
 245   { this->search_path_.push_back(Search_directory(arg, true)); }
 246
 247   void
 248   set_optimization_level(const char* arg)
 249   { this->optimization_level_ = atoi(arg); }
 250
 251   void
 252   set_output_file_name(const char* arg)
 253   { this->output_file_name_ = arg; }
 254
 255   void
 256   set_relocatable()
 257   { this->is_relocatable_ = true; }
 258
 259   void
 260   set_strip_all()
 261   { this->strip_ = STRIP_ALL; }
 262
 263   // Note: normalize_options() depends on the fact that this turns off
 264   // STRIP_ALL if it were already set.
 265   void
 266   set_strip_debug()
 267   { this->strip_ = STRIP_DEBUG; }
 268
 269   void
 270   set_create_eh_frame_hdr()
 271   { this->create_eh_frame_hdr_ = true; }
 272
 273   void
 274   add_to_rpath(const char* arg)
 275   { this->rpath_.push_back(Search_directory(arg, false)); }
 276
 277   void
 278   add_to_rpath_link(const char* arg)
 279   { this->rpath_link_.push_back(Search_directory(arg, false)); }
 280
 281   void
 282   set_shared()
 283   { this->is_shared_ = true; }
 284
 285   void
 286   set_static()
 287   { this->is_static_ = true; }
 288
 289   void
 290   set_stats()
 291   { this->print_stats_ = true; }
 292
 293   void
 294   set_sysroot(const char* arg)
 295   { this->sysroot_ = arg; }
 296
 297   void
 298   set_text_segment_address(const char* arg)
 299   {
 300     char* endptr;
 301     this->text_segment_address_ = strtoull(arg, &endptr, 0);
 302     if (*endptr != '\0'
 303         || this->text_segment_address_ == -1U)
 304       {
 305         fprintf(stderr, _("%s: invalid argument to -Ttext: %s\n"),
 306                 program_name, arg);
 307         ::exit(1);
 308       }
 309   }
 310
 311   int
 312   parse_thread_count(const char* arg)
 313   {
 314     char* endptr;
 315     int count = strtol(arg, &endptr, 0);
 316     if (*endptr != '\0' || count < 0)
 317       {
 318         fprintf(stderr, _("%s: invalid thread count: %s\n"),
 319                 program_name, arg);
 320         ::exit(1);
 321       }
 322     return count;
 323   }
 324
 325   void
 326   set_threads()
 327   { this->threads_ = true; }
 328
 329   void
 330   clear_threads()
 331   { this->threads_ = false; }
 332
 333   void
 334   set_thread_count(const char* arg)
 335   {
 336     int count = this->parse_thread_count(arg);
 337     this->thread_count_initial_ = count;
 338     this->thread_count_middle_ = count;
 339     this->thread_count_final_ = count;
 340   }
 341
 342   void
 343   set_thread_count_initial(const char* arg)
 344   { this->thread_count_initial_ = this->parse_thread_count(arg); }
 345
 346   void
 347   set_thread_count_middle(const char* arg)
 348   { this->thread_count_initial_ = this->parse_thread_count(arg); }
 349
 350   void
 351   set_thread_count_final(const char* arg)
 352   { this->thread_count_initial_ = this->parse_thread_count(arg); }
 353
 354   void
 355   ignore(const char*)
 356   { }
 357
 358   // Apply any sysroot to the directory lists.
 359   void
 360   add_sysroot();
 361
 362   bool export_dynamic_;
 363   const char* dynamic_linker_;
 364   Dir_list search_path_;
 365   int optimization_level_;
 366   const char* output_file_name_;
 367   bool is_relocatable_;
 368   Strip strip_;
 369   bool create_eh_frame_hdr_;
 370   Dir_list rpath_;
 371   Dir_list rpath_link_;
 372   bool is_shared_;
 373   bool is_static_;
 374   bool print_stats_;
 375   std::string sysroot_;
 376   uint64_t text_segment_address_;
 377   bool threads_;
 378   int thread_count_initial_;
 379   int thread_count_middle_;
 380   int thread_count_final_;
 381 };
 382
 383 // The current state of the position dependent options.
 384
 385 class Position_dependent_options
 386 {
 387  public:
 388   Position_dependent_options();
 389
 390   // -Bstatic: Whether we are searching for a static archive rather
 391   // than a shared object.
 392   bool
 393   do_static_search() const
 394   { return this->do_static_search_; }
 395
 396   // --as-needed: Whether to add a DT_NEEDED argument only if the
 397   // dynamic object is used.
 398   bool
 399   as_needed() const
 400   { return this->as_needed_; }
 401
 402   // --whole-archive: Whether to include the entire contents of an
 403   // --archive.
 404   bool
 405   include_whole_archive() const
 406   { return this->include_whole_archive_; }
 407
 408   void
 409   set_static_search()
 410   { this->do_static_search_ = true; }
 411
 412   void
 413   set_dynamic_search()
 414   { this->do_static_search_ = false; }
 415
 416   void
 417   set_as_needed()
 418   { this->as_needed_ = true; }
 419
 420   void
 421   clear_as_needed()
 422   { this->as_needed_ = false; }
 423
 424   void
 425   set_whole_archive()
 426   { this->include_whole_archive_ = true; }
 427
 428   void
 429   clear_whole_archive()
 430   { this->include_whole_archive_ = false; }
 431
 432  private:
 433   bool do_static_search_;
 434   bool as_needed_;
 435   bool include_whole_archive_;
 436 };
 437
 438 // A single file or library argument from the command line.
 439
 440 class Input_file_argument
 441 {
 442  public:
 443   // name: file name or library name
 444   // is_lib: true if name is a library name: that is, emits the leading
 445   //         "lib" and trailing ".so"/".a" from the name
 446   // extra_search_path: an extra directory to look for the file, prior
 447   //         to checking the normal library search path.  If this is "",
 448   //         then no extra directory is added.
 449   // options: The position dependent options at this point in the
 450   //         command line, such as --whole-archive.
 451   Input_file_argument()
 452     : name_(), is_lib_(false), extra_search_path_(""), options_()
 453   { }
 454
 455   Input_file_argument(const char* name, bool is_lib,
 456                       const char* extra_search_path,
 457                       const Position_dependent_options& options)
 458     : name_(name), is_lib_(is_lib), extra_search_path_(extra_search_path),
 459       options_(options)
 460   { }
 461
 462   const char*
 463   name() const
 464   { return this->name_.c_str(); }
 465
 466   const Position_dependent_options&
 467   options() const
 468   { return this->options_; }
 469
 470   bool
 471   is_lib() const
 472   { return this->is_lib_; }
 473
 474   const char*
 475   extra_search_path() const
 476   {
 477     return (this->extra_search_path_.empty()
 478             ? NULL
 479             : this->extra_search_path_.c_str());
 480   }
 481
 482   // Return whether this file may require a search using the -L
 483   // options.
 484   bool
 485   may_need_search() const
 486   { return this->is_lib_ || !this->extra_search_path_.empty(); }
 487
 488  private:
 489   // We use std::string, not const char*, here for convenience when
 490   // using script files, so that we do not have to preserve the string
 491   // in that case.
 492   std::string name_;
 493   bool is_lib_;
 494   std::string extra_search_path_;
 495   Position_dependent_options options_;
 496 };
 497
 498 // A file or library, or a group, from the command line.
 499
 500 class Input_argument
 501 {
 502  public:
 503   // Create a file or library argument.
 504   explicit Input_argument(Input_file_argument file)
 505     : is_file_(true), file_(file), group_(NULL)
 506   { }
 507
 508   // Create a group argument.
 509   explicit Input_argument(Input_file_group* group)
 510     : is_file_(false), group_(group)
 511   { }
 512
 513   // Return whether this is a file.
 514   bool
 515   is_file() const
 516   { return this->is_file_; }
 517
 518   // Return whether this is a group.
 519   bool
 520   is_group() const
 521   { return !this->is_file_; }
 522
 523   // Return the information about the file.
 524   const Input_file_argument&
 525   file() const
 526   {
 527     gold_assert(this->is_file_);
 528     return this->file_;
 529   }
 530
 531   // Return the information about the group.
 532   const Input_file_group*
 533   group() const
 534   {
 535     gold_assert(!this->is_file_);
 536     return this->group_;
 537   }
 538
 539   Input_file_group*
 540   group()
 541   {
 542     gold_assert(!this->is_file_);
 543     return this->group_;
 544   }
 545
 546  private:
 547   bool is_file_;
 548   Input_file_argument file_;
 549   Input_file_group* group_;
 550 };
 551
 552 // A group from the command line.  This is a set of arguments within
 553 // --start-group ... --end-group.
 554
 555 class Input_file_group
 556 {
 557  public:
 558   typedef std::vector<Input_argument> Files;
 559   typedef Files::const_iterator const_iterator;
 560
 561   Input_file_group()
 562     : files_()
 563   { }
 564
 565   // Add a file to the end of the group.
 566   void
 567   add_file(const Input_file_argument& arg)
 568   { this->files_.push_back(Input_argument(arg)); }
 569
 570   // Iterators to iterate over the group contents.
 571
 572   const_iterator
 573   begin() const
 574   { return this->files_.begin(); }
 575
 576   const_iterator
 577   end() const
 578   { return this->files_.end(); }
 579
 580  private:
 581   Files files_;
 582 };
 583
 584 // A list of files from the command line or a script.
 585
 586 class Input_arguments
 587 {
 588  public:
 589   typedef std::vector<Input_argument> Input_argument_list;
 590   typedef Input_argument_list::const_iterator const_iterator;
 591
 592   Input_arguments()
 593     : input_argument_list_(), in_group_(false)
 594   { }
 595
 596   // Add a file.
 597   void
 598   add_file(const Input_file_argument& arg);
 599
 600   // Start a group (the --start-group option).
 601   void
 602   start_group();
 603
 604   // End a group (the --end-group option).
 605   void
 606   end_group();
 607
 608   // Return whether we are currently in a group.
 609   bool
 610   in_group() const
 611   { return this->in_group_; }
 612
 613   // The number of entries in the list.
 614   int
 615   size() const
 616   { return this->input_argument_list_.size(); }
 617
 618   // Iterators to iterate over the list of input files.
 619
 620   const_iterator
 621   begin() const
 622   { return this->input_argument_list_.begin(); }
 623
 624   const_iterator
 625   end() const
 626   { return this->input_argument_list_.end(); }
 627
 628   // Return whether the list is empty.
 629   bool
 630   empty() const
 631   { return this->input_argument_list_.empty(); }
 632
 633  private:
 634   Input_argument_list input_argument_list_;
 635   bool in_group_;
 636 };
 637
 638 // All the information read from the command line.
 639
 640 class Command_line
 641 {
 642  public:
 643   typedef Input_arguments::const_iterator const_iterator;
 644
 645   Command_line();
 646
 647   // Process the command line options.  This will exit with an
 648   // appropriate error message if an unrecognized option is seen.
 649   void
 650   process(int argc, char** argv);
 651
 652   // Handle a -l option.
 653   int
 654   process_l_option(int, char**, char*);
 655
 656   // Handle a --start-group option.
 657   void
 658   start_group(const char* arg);
 659
 660   // Handle a --end-group option.
 661   void
 662   end_group(const char* arg);
 663
 664   // Get the general options.
 665   const General_options&
 666   options() const
 667   { return this->options_; }
 668
 669   // The number of input files.
 670   int
 671   number_of_input_files() const
 672   { return this->inputs_.size(); }
 673
 674   // Iterators to iterate over the list of input files.
 675
 676   const_iterator
 677   begin() const
 678   { return this->inputs_.begin(); }
 679
 680   const_iterator
 681   end() const
 682   { return this->inputs_.end(); }
 683
 684  private:
 685   Command_line(const Command_line&);
 686   Command_line& operator=(const Command_line&);
 687
 688   // Report usage error.
 689   void
 690   usage() ATTRIBUTE_NORETURN;
 691   void
 692   usage(const char* msg, const char* opt) ATTRIBUTE_NORETURN;
 693   void
 694   usage(const char* msg, char opt) ATTRIBUTE_NORETURN;
 695
 696   // Apply a command line option.
 697   void
 698   apply_option(const gold::options::One_option&, const char*);
 699
 700   // Add a file.
 701   void
 702   add_file(const char* name, bool is_lib);
 703
 704   // Examine the result of processing the command-line, and verify
 705   // the flags do not contradict each other or are otherwise illegal.
 706   void
 707   normalize_options();
 708
 709   General_options options_;
 710   Position_dependent_options position_options_;
 711   Input_arguments inputs_;
 712 };
 713
 714 } // End namespace gold.
 715
 716 #endif // !defined(GOLD_OPTIONS_H)