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 #include "script.h"
  41
  42 namespace gold
  43 {
  44
  45 class Command_line;
  46 class Input_file_group;
  47 class Position_dependent_options;
  48
  49 namespace options {
  50
  51 class Command_line_options;
  52 struct One_option;
  53 struct One_z_option;
  54
  55 } // End namespace gold::options.
  56
  57 // A directory to search.  For each directory we record whether it is
  58 // in the sysroot.  We need to know this so that, if a linker script
  59 // is found within the sysroot, we will apply the sysroot to any files
  60 // named by that script.
  61
  62 class Search_directory
  63 {
  64  public:
  65   // We need a default constructor because we put this in a
  66   // std::vector.
  67   Search_directory()
  68     : name_(NULL), put_in_sysroot_(false), is_in_sysroot_(false)
  69   { }
  70
  71   // This is the usual constructor.
  72   Search_directory(const char* name, bool put_in_sysroot)
  73     : name_(name), put_in_sysroot_(put_in_sysroot), is_in_sysroot_(false)
  74   { gold_assert(!this->name_.empty()); }
  75
  76   // This is called if we have a sysroot.  The sysroot is prefixed to
  77   // any entries for which put_in_sysroot_ is true.  is_in_sysroot_ is
  78   // set to true for any enries which are in the sysroot (this will
  79   // naturally include any entries for which put_in_sysroot_ is true).
  80   // SYSROOT is the sysroot, CANONICAL_SYSROOT is the result of
  81   // passing SYSROOT to lrealpath.
  82   void
  83   add_sysroot(const char* sysroot, const char* canonical_sysroot);
  84
  85   // Get the directory name.
  86   const std::string&
  87   name() const
  88   { return this->name_; }
  89
  90   // Return whether this directory is in the sysroot.
  91   bool
  92   is_in_sysroot() const
  93   { return this->is_in_sysroot_; }
  94
  95  private:
  96   std::string name_;
  97   bool put_in_sysroot_;
  98   bool is_in_sysroot_;
  99 };
 100
 101 // The position independent options which apply to the whole link.
 102 // There are a lot of them.
 103
 104 class General_options
 105 {
 106  public:
 107   General_options();
 108
 109   // -E: export dynamic symbols.
 110   bool
 111   export_dynamic() const
 112   { return this->export_dynamic_; }
 113
 114   // -I: dynamic linker name.
 115   const char*
 116   dynamic_linker() const
 117   { return this->dynamic_linker_; }
 118
 119   // -L: Library search path.
 120   typedef std::vector<Search_directory> Dir_list;
 121
 122   const Dir_list&
 123   search_path() const
 124   { return this->search_path_; }
 125
 126   // -O: optimization level (0: don't try to optimize output size).
 127   int
 128   optimization_level() const
 129   { return this->optimization_level_; }
 130
 131   // -o: Output file name.
 132   const char*
 133   output_file_name() const
 134   { return this->output_file_name_; }
 135
 136   // -r: Whether we are doing a relocatable link.
 137   bool
 138   is_relocatable() const
 139   { return this->is_relocatable_; }
 140
 141   // -s: Strip all symbols.
 142   bool
 143   strip_all() const
 144   { return this->strip_ == STRIP_ALL; }
 145
 146   // -S: Strip debugging information.
 147   bool
 148   strip_debug() const
 149   { return this->strip_ == STRIP_ALL || this->strip_ == STRIP_DEBUG; }
 150
 151   // -Bsymbolic: bind defined symbols locally.
 152   bool
 153   symbolic() const
 154   { return this->symbolic_; }
 155
 156   // --eh-frame-hdr: Whether to generate an exception frame header.
 157   bool
 158   create_eh_frame_hdr() const
 159   { return this->create_eh_frame_hdr_; }
 160
 161   // --rpath: The runtime search path.
 162   const Dir_list&
 163   rpath() const
 164   { return this->rpath_; }
 165
 166   // --rpath-link: The link time search patch for shared libraries.
 167   const Dir_list&
 168   rpath_link() const
 169   { return this->rpath_link_; }
 170
 171   // --shared: Whether generating a shared object.
 172   bool
 173   is_shared() const
 174   { return this->is_shared_; }
 175
 176   // --static: Whether doing a static link.
 177   bool
 178   is_static() const
 179   { return this->is_static_; }
 180
 181   // --stats: Print resource usage statistics.
 182   bool
 183   print_stats() const
 184   { return this->print_stats_; }
 185
 186   // --sysroot: The system root of a cross-linker.
 187   const std::string&
 188   sysroot() const
 189   { return this->sysroot_; }
 190
 191   // -Ttext: The address of the .text section
 192   uint64_t
 193   text_segment_address() const
 194   { return this->text_segment_address_; }
 195
 196   // Whether -Ttext was used.
 197   bool
 198   user_set_text_segment_address() const
 199   { return this->text_segment_address_ != -1U; }
 200
 201   // --threads: Whether to use threads.
 202   bool
 203   threads() const
 204   { return this->threads_; }
 205
 206   // --thread-count-initial: Threads to use in initial pass.
 207   int
 208   thread_count_initial() const
 209   { return this->thread_count_initial_; }
 210
 211   // --thread-count-middle: Threads to use in middle pass.
 212   int
 213   thread_count_middle() const
 214   { return this->thread_count_middle_; }
 215
 216   // --thread-count-final: Threads to use in final pass.
 217   int
 218   thread_count_final() const
 219   { return this->thread_count_final_; }
 220
 221   // -z execstack, -z noexecstack
 222   bool
 223   is_execstack_set() const
 224   { return this->execstack_ != EXECSTACK_FROM_INPUT; }
 225
 226   bool
 227   is_stack_executable() const
 228   { return this->execstack_ == EXECSTACK_YES; }
 229
 230  private:
 231   // Don't copy this structure.
 232   General_options(const General_options&);
 233   General_options& operator=(const General_options&);
 234
 235   friend class Command_line;
 236   friend class options::Command_line_options;
 237
 238   // Which symbols to strip.
 239   enum Strip
 240   {
 241     // Don't strip any symbols.
 242     STRIP_NONE,
 243     // Strip all symbols.
 244     STRIP_ALL,
 245     // Strip debugging information.
 246     STRIP_DEBUG
 247   };
 248
 249   // Whether to mark the stack as executable.
 250   enum Execstack
 251   {
 252     // Not set on command line.
 253     EXECSTACK_FROM_INPUT,
 254     // Mark the stack as executable.
 255     EXECSTACK_YES,
 256     // Mark the stack as not executable.
 257     EXECSTACK_NO
 258   };
 259
 260   void
 261   set_export_dynamic()
 262   { this->export_dynamic_ = true; }
 263
 264   void
 265   set_dynamic_linker(const char* arg)
 266   { this->dynamic_linker_ = arg; }
 267
 268   void
 269   add_to_search_path(const char* arg)
 270   { this->search_path_.push_back(Search_directory(arg, false)); }
 271
 272   void
 273   add_to_search_path_with_sysroot(const char* arg)
 274   { this->search_path_.push_back(Search_directory(arg, true)); }
 275
 276   void
 277   set_optimization_level(const char* arg)
 278   { this->optimization_level_ = atoi(arg); }
 279
 280   void
 281   set_output_file_name(const char* arg)
 282   { this->output_file_name_ = arg; }
 283
 284   void
 285   set_relocatable()
 286   { this->is_relocatable_ = true; }
 287
 288   void
 289   set_strip_all()
 290   { this->strip_ = STRIP_ALL; }
 291
 292   // Note: normalize_options() depends on the fact that this turns off
 293   // STRIP_ALL if it were already set.
 294   void
 295   set_strip_debug()
 296   { this->strip_ = STRIP_DEBUG; }
 297
 298   void
 299   set_symbolic()
 300   { this->symbolic_ = true; }
 301
 302   void
 303   set_create_eh_frame_hdr()
 304   { this->create_eh_frame_hdr_ = true; }
 305
 306   void
 307   add_to_rpath(const char* arg)
 308   { this->rpath_.push_back(Search_directory(arg, false)); }
 309
 310   void
 311   add_to_rpath_link(const char* arg)
 312   { this->rpath_link_.push_back(Search_directory(arg, false)); }
 313
 314   void
 315   set_shared()
 316   { this->is_shared_ = true; }
 317
 318   void
 319   set_static()
 320   { this->is_static_ = true; }
 321
 322   void
 323   set_stats()
 324   { this->print_stats_ = true; }
 325
 326   void
 327   set_sysroot(const char* arg)
 328   { this->sysroot_ = arg; }
 329
 330   void
 331   set_text_segment_address(const char* arg)
 332   {
 333     char* endptr;
 334     this->text_segment_address_ = strtoull(arg, &endptr, 0);
 335     if (*endptr != '\0'
 336         || this->text_segment_address_ == -1U)
 337       {
 338         fprintf(stderr, _("%s: invalid argument to -Ttext: %s\n"),
 339                 program_name, arg);
 340         ::exit(1);
 341       }
 342   }
 343
 344   int
 345   parse_thread_count(const char* arg)
 346   {
 347     char* endptr;
 348     int count = strtol(arg, &endptr, 0);
 349     if (*endptr != '\0' || count < 0)
 350       {
 351         fprintf(stderr, _("%s: invalid thread count: %s\n"),
 352                 program_name, arg);
 353         ::exit(1);
 354       }
 355     return count;
 356   }
 357
 358   void
 359   set_threads()
 360   { this->threads_ = true; }
 361
 362   void
 363   clear_threads()
 364   { this->threads_ = false; }
 365
 366   void
 367   set_thread_count(const char* arg)
 368   {
 369     int count = this->parse_thread_count(arg);
 370     this->thread_count_initial_ = count;
 371     this->thread_count_middle_ = count;
 372     this->thread_count_final_ = count;
 373   }
 374
 375   void
 376   set_thread_count_initial(const char* arg)
 377   { this->thread_count_initial_ = this->parse_thread_count(arg); }
 378
 379   void
 380   set_thread_count_middle(const char* arg)
 381   { this->thread_count_initial_ = this->parse_thread_count(arg); }
 382
 383   void
 384   set_thread_count_final(const char* arg)
 385   { this->thread_count_initial_ = this->parse_thread_count(arg); }
 386
 387   void
 388   ignore(const char*)
 389   { }
 390
 391   void
 392   set_execstack()
 393   { this->execstack_ = EXECSTACK_YES; }
 394
 395   void
 396   set_noexecstack()
 397   { this->execstack_ = EXECSTACK_NO; }
 398
 399   // Handle the -z option.
 400   void
 401   handle_z_option(const char*);
 402
 403   // Apply any sysroot to the directory lists.
 404   void
 405   add_sysroot();
 406
 407   bool export_dynamic_;
 408   const char* dynamic_linker_;
 409   Dir_list search_path_;
 410   int optimization_level_;
 411   const char* output_file_name_;
 412   bool is_relocatable_;
 413   Strip strip_;
 414   bool symbolic_;
 415   bool create_eh_frame_hdr_;
 416   Dir_list rpath_;
 417   Dir_list rpath_link_;
 418   bool is_shared_;
 419   bool is_static_;
 420   bool print_stats_;
 421   std::string sysroot_;
 422   uint64_t text_segment_address_;
 423   bool threads_;
 424   int thread_count_initial_;
 425   int thread_count_middle_;
 426   int thread_count_final_;
 427   Execstack execstack_;
 428 };
 429
 430 // The current state of the position dependent options.
 431
 432 class Position_dependent_options
 433 {
 434  public:
 435   Position_dependent_options();
 436
 437   // -Bdynamic/-Bstatic: Whether we are searching for a static archive
 438   // -rather than a shared object.
 439   bool
 440   do_static_search() const
 441   { return this->do_static_search_; }
 442
 443   // --as-needed: Whether to add a DT_NEEDED argument only if the
 444   // dynamic object is used.
 445   bool
 446   as_needed() const
 447   { return this->as_needed_; }
 448
 449   // --whole-archive: Whether to include the entire contents of an
 450   // --archive.
 451   bool
 452   include_whole_archive() const
 453   { return this->include_whole_archive_; }
 454
 455   void
 456   set_static_search()
 457   { this->do_static_search_ = true; }
 458
 459   void
 460   set_dynamic_search()
 461   { this->do_static_search_ = false; }
 462
 463   void
 464   set_as_needed()
 465   { this->as_needed_ = true; }
 466
 467   void
 468   clear_as_needed()
 469   { this->as_needed_ = false; }
 470
 471   void
 472   set_whole_archive()
 473   { this->include_whole_archive_ = true; }
 474
 475   void
 476   clear_whole_archive()
 477   { this->include_whole_archive_ = false; }
 478
 479  private:
 480   bool do_static_search_;
 481   bool as_needed_;
 482   bool include_whole_archive_;
 483 };
 484
 485 // A single file or library argument from the command line.
 486
 487 class Input_file_argument
 488 {
 489  public:
 490   // name: file name or library name
 491   // is_lib: true if name is a library name: that is, emits the leading
 492   //         "lib" and trailing ".so"/".a" from the name
 493   // extra_search_path: an extra directory to look for the file, prior
 494   //         to checking the normal library search path.  If this is "",
 495   //         then no extra directory is added.
 496   // options: The position dependent options at this point in the
 497   //         command line, such as --whole-archive.
 498   Input_file_argument()
 499     : name_(), is_lib_(false), extra_search_path_(""), options_()
 500   { }
 501
 502   Input_file_argument(const char* name, bool is_lib,
 503                       const char* extra_search_path,
 504                       const Position_dependent_options& options)
 505     : name_(name), is_lib_(is_lib), extra_search_path_(extra_search_path),
 506       options_(options)
 507   { }
 508
 509   const char*
 510   name() const
 511   { return this->name_.c_str(); }
 512
 513   const Position_dependent_options&
 514   options() const
 515   { return this->options_; }
 516
 517   bool
 518   is_lib() const
 519   { return this->is_lib_; }
 520
 521   const char*
 522   extra_search_path() const
 523   {
 524     return (this->extra_search_path_.empty()
 525             ? NULL
 526             : this->extra_search_path_.c_str());
 527   }
 528
 529   // Return whether this file may require a search using the -L
 530   // options.
 531   bool
 532   may_need_search() const
 533   { return this->is_lib_ || !this->extra_search_path_.empty(); }
 534
 535  private:
 536   // We use std::string, not const char*, here for convenience when
 537   // using script files, so that we do not have to preserve the string
 538   // in that case.
 539   std::string name_;
 540   bool is_lib_;
 541   std::string extra_search_path_;
 542   Position_dependent_options options_;
 543 };
 544
 545 // A file or library, or a group, from the command line.
 546
 547 class Input_argument
 548 {
 549  public:
 550   // Create a file or library argument.
 551   explicit Input_argument(Input_file_argument file)
 552     : is_file_(true), file_(file), group_(NULL)
 553   { }
 554
 555   // Create a group argument.
 556   explicit Input_argument(Input_file_group* group)
 557     : is_file_(false), group_(group)
 558   { }
 559
 560   // Return whether this is a file.
 561   bool
 562   is_file() const
 563   { return this->is_file_; }
 564
 565   // Return whether this is a group.
 566   bool
 567   is_group() const
 568   { return !this->is_file_; }
 569
 570   // Return the information about the file.
 571   const Input_file_argument&
 572   file() const
 573   {
 574     gold_assert(this->is_file_);
 575     return this->file_;
 576   }
 577
 578   // Return the information about the group.
 579   const Input_file_group*
 580   group() const
 581   {
 582     gold_assert(!this->is_file_);
 583     return this->group_;
 584   }
 585
 586   Input_file_group*
 587   group()
 588   {
 589     gold_assert(!this->is_file_);
 590     return this->group_;
 591   }
 592
 593  private:
 594   bool is_file_;
 595   Input_file_argument file_;
 596   Input_file_group* group_;
 597 };
 598
 599 // A group from the command line.  This is a set of arguments within
 600 // --start-group ... --end-group.
 601
 602 class Input_file_group
 603 {
 604  public:
 605   typedef std::vector<Input_argument> Files;
 606   typedef Files::const_iterator const_iterator;
 607
 608   Input_file_group()
 609     : files_()
 610   { }
 611
 612   // Add a file to the end of the group.
 613   void
 614   add_file(const Input_file_argument& arg)
 615   { this->files_.push_back(Input_argument(arg)); }
 616
 617   // Iterators to iterate over the group contents.
 618
 619   const_iterator
 620   begin() const
 621   { return this->files_.begin(); }
 622
 623   const_iterator
 624   end() const
 625   { return this->files_.end(); }
 626
 627  private:
 628   Files files_;
 629 };
 630
 631 // A list of files from the command line or a script.
 632
 633 class Input_arguments
 634 {
 635  public:
 636   typedef std::vector<Input_argument> Input_argument_list;
 637   typedef Input_argument_list::const_iterator const_iterator;
 638
 639   Input_arguments()
 640     : input_argument_list_(), in_group_(false)
 641   { }
 642
 643   // Add a file.
 644   void
 645   add_file(const Input_file_argument& arg);
 646
 647   // Start a group (the --start-group option).
 648   void
 649   start_group();
 650
 651   // End a group (the --end-group option).
 652   void
 653   end_group();
 654
 655   // Return whether we are currently in a group.
 656   bool
 657   in_group() const
 658   { return this->in_group_; }
 659
 660   // The number of entries in the list.
 661   int
 662   size() const
 663   { return this->input_argument_list_.size(); }
 664
 665   // Iterators to iterate over the list of input files.
 666
 667   const_iterator
 668   begin() const
 669   { return this->input_argument_list_.begin(); }
 670
 671   const_iterator
 672   end() const
 673   { return this->input_argument_list_.end(); }
 674
 675   // Return whether the list is empty.
 676   bool
 677   empty() const
 678   { return this->input_argument_list_.empty(); }
 679
 680  private:
 681   Input_argument_list input_argument_list_;
 682   bool in_group_;
 683 };
 684
 685 // All the information read from the command line.
 686
 687 class Command_line
 688 {
 689  public:
 690   typedef Input_arguments::const_iterator const_iterator;
 691
 692   Command_line();
 693
 694   // Process the command line options.  This will exit with an
 695   // appropriate error message if an unrecognized option is seen.
 696   void
 697   process(int argc, char** argv);
 698
 699   // Handle a -l option.
 700   int
 701   process_l_option(int, char**, char*, bool);
 702
 703   // Handle a --start-group option.
 704   void
 705   start_group(const char* arg);
 706
 707   // Handle a --end-group option.
 708   void
 709   end_group(const char* arg);
 710
 711   // Get an option argument--a helper function for special processing.
 712   const char*
 713   get_special_argument(const char* longname, int argc, char** argv,
 714                        const char* arg, bool long_option,
 715                        int *pret);
 716
 717   // Get the general options.
 718   const General_options&
 719   options() const
 720   { return this->options_; }
 721
 722   // Get the position dependent options.
 723   const Position_dependent_options&
 724   position_dependent_options() const
 725   { return this->position_options_; }
 726
 727   // The number of input files.
 728   int
 729   number_of_input_files() const
 730   { return this->inputs_.size(); }
 731
 732   // Iterators to iterate over the list of input files.
 733
 734   const_iterator
 735   begin() const
 736   { return this->inputs_.begin(); }
 737
 738   const_iterator
 739   end() const
 740   { return this->inputs_.end(); }
 741
 742  private:
 743   Command_line(const Command_line&);
 744   Command_line& operator=(const Command_line&);
 745
 746   // Report usage error.
 747   void
 748   usage() ATTRIBUTE_NORETURN;
 749   void
 750   usage(const char* msg, const char* opt) ATTRIBUTE_NORETURN;
 751   void
 752   usage(const char* msg, char opt) ATTRIBUTE_NORETURN;
 753
 754   // Apply a command line option.
 755   void
 756   apply_option(const gold::options::One_option&, const char*);
 757
 758   // Add a file.
 759   void
 760   add_file(const char* name, bool is_lib);
 761
 762   // Examine the result of processing the command-line, and verify
 763   // the flags do not contradict each other or are otherwise illegal.
 764   void
 765   normalize_options();
 766
 767   General_options options_;
 768   Position_dependent_options position_options_;
 769   Input_arguments inputs_;
 770 };
 771
 772 } // End namespace gold.
 773
 774 #endif // !defined(GOLD_OPTIONS_H)