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   // --allow-shlib-undefined: do not warn about unresolved symbols in
 152   // --shared libraries.
 153   bool
 154   allow_shlib_undefined() const
 155   { return this->allow_shlib_undefined_; }
 156
 157   // -Bsymbolic: bind defined symbols locally.
 158   bool
 159   symbolic() const
 160   { return this->symbolic_; }
 161
 162   // --detect-odr-violations: Whether to search for One Defn Rule violations.
 163   bool
 164   detect_odr_violations() const
 165   { return this->detect_odr_violations_; }
 166
 167   // --eh-frame-hdr: Whether to generate an exception frame header.
 168   bool
 169   create_eh_frame_hdr() const
 170   { return this->create_eh_frame_hdr_; }
 171
 172   // --rpath: The runtime search path.
 173   const Dir_list&
 174   rpath() const
 175   { return this->rpath_; }
 176
 177   // --rpath-link: The link time search patch for shared libraries.
 178   const Dir_list&
 179   rpath_link() const
 180   { return this->rpath_link_; }
 181
 182   // --shared: Whether generating a shared object.
 183   bool
 184   is_shared() const
 185   { return this->is_shared_; }
 186
 187   // --static: Whether doing a static link.
 188   bool
 189   is_static() const
 190   { return this->is_static_; }
 191
 192   // --stats: Print resource usage statistics.
 193   bool
 194   print_stats() const
 195   { return this->print_stats_; }
 196
 197   // --sysroot: The system root of a cross-linker.
 198   const std::string&
 199   sysroot() const
 200   { return this->sysroot_; }
 201
 202   // -Ttext: The address of the .text section
 203   uint64_t
 204   text_segment_address() const
 205   { return this->text_segment_address_; }
 206
 207   // Whether -Ttext was used.
 208   bool
 209   user_set_text_segment_address() const
 210   { return this->text_segment_address_ != -1U; }
 211
 212   // --threads: Whether to use threads.
 213   bool
 214   threads() const
 215   { return this->threads_; }
 216
 217   // --thread-count-initial: Threads to use in initial pass.
 218   int
 219   thread_count_initial() const
 220   { return this->thread_count_initial_; }
 221
 222   // --thread-count-middle: Threads to use in middle pass.
 223   int
 224   thread_count_middle() const
 225   { return this->thread_count_middle_; }
 226
 227   // --thread-count-final: Threads to use in final pass.
 228   int
 229   thread_count_final() const
 230   { return this->thread_count_final_; }
 231
 232   // -z execstack, -z noexecstack
 233   bool
 234   is_execstack_set() const
 235   { return this->execstack_ != EXECSTACK_FROM_INPUT; }
 236
 237   bool
 238   is_stack_executable() const
 239   { return this->execstack_ == EXECSTACK_YES; }
 240
 241  private:
 242   // Don't copy this structure.
 243   General_options(const General_options&);
 244   General_options& operator=(const General_options&);
 245
 246   friend class Command_line;
 247   friend class options::Command_line_options;
 248
 249   // Which symbols to strip.
 250   enum Strip
 251   {
 252     // Don't strip any symbols.
 253     STRIP_NONE,
 254     // Strip all symbols.
 255     STRIP_ALL,
 256     // Strip debugging information.
 257     STRIP_DEBUG
 258   };
 259
 260   // Whether to mark the stack as executable.
 261   enum Execstack
 262   {
 263     // Not set on command line.
 264     EXECSTACK_FROM_INPUT,
 265     // Mark the stack as executable.
 266     EXECSTACK_YES,
 267     // Mark the stack as not executable.
 268     EXECSTACK_NO
 269   };
 270
 271   void
 272   set_export_dynamic()
 273   { this->export_dynamic_ = true; }
 274
 275   void
 276   set_dynamic_linker(const char* arg)
 277   { this->dynamic_linker_ = arg; }
 278
 279   void
 280   add_to_search_path(const char* arg)
 281   { this->search_path_.push_back(Search_directory(arg, false)); }
 282
 283   void
 284   add_to_search_path_with_sysroot(const char* arg)
 285   { this->search_path_.push_back(Search_directory(arg, true)); }
 286
 287   void
 288   set_optimization_level(const char* arg)
 289   { this->optimization_level_ = atoi(arg); }
 290
 291   void
 292   set_output_file_name(const char* arg)
 293   { this->output_file_name_ = arg; }
 294
 295   void
 296   set_relocatable()
 297   { this->is_relocatable_ = true; }
 298
 299   void
 300   set_strip_all()
 301   { this->strip_ = STRIP_ALL; }
 302
 303   // Note: normalize_options() depends on the fact that this turns off
 304   // STRIP_ALL if it were already set.
 305   void
 306   set_strip_debug()
 307   { this->strip_ = STRIP_DEBUG; }
 308
 309   void
 310   set_allow_shlib_undefined()
 311   { this->allow_shlib_undefined_ = true; }
 312
 313   void
 314   set_no_allow_shlib_undefined()
 315   { this->allow_shlib_undefined_ = false; }
 316
 317   void
 318   set_symbolic()
 319   { this->symbolic_ = true; }
 320
 321   void
 322   set_detect_odr_violations()
 323   { this->detect_odr_violations_ = true; }
 324
 325   void
 326   set_create_eh_frame_hdr()
 327   { this->create_eh_frame_hdr_ = true; }
 328
 329   void
 330   add_to_rpath(const char* arg)
 331   { this->rpath_.push_back(Search_directory(arg, false)); }
 332
 333   void
 334   add_to_rpath_link(const char* arg)
 335   { this->rpath_link_.push_back(Search_directory(arg, false)); }
 336
 337   void
 338   set_shared()
 339   { this->is_shared_ = true; }
 340
 341   void
 342   set_static()
 343   { this->is_static_ = true; }
 344
 345   void
 346   set_stats()
 347   { this->print_stats_ = true; }
 348
 349   void
 350   set_sysroot(const char* arg)
 351   { this->sysroot_ = arg; }
 352
 353   void
 354   set_text_segment_address(const char* arg)
 355   {
 356     char* endptr;
 357     this->text_segment_address_ = strtoull(arg, &endptr, 0);
 358     if (*endptr != '\0'
 359         || this->text_segment_address_ == -1U)
 360       {
 361         fprintf(stderr, _("%s: invalid argument to -Ttext: %s\n"),
 362                 program_name, arg);
 363         ::exit(1);
 364       }
 365   }
 366
 367   int
 368   parse_thread_count(const char* arg)
 369   {
 370     char* endptr;
 371     int count = strtol(arg, &endptr, 0);
 372     if (*endptr != '\0' || count < 0)
 373       {
 374         fprintf(stderr, _("%s: invalid thread count: %s\n"),
 375                 program_name, arg);
 376         ::exit(1);
 377       }
 378     return count;
 379   }
 380
 381   void
 382   set_threads()
 383   { this->threads_ = true; }
 384
 385   void
 386   clear_threads()
 387   { this->threads_ = false; }
 388
 389   void
 390   set_thread_count(const char* arg)
 391   {
 392     int count = this->parse_thread_count(arg);
 393     this->thread_count_initial_ = count;
 394     this->thread_count_middle_ = count;
 395     this->thread_count_final_ = count;
 396   }
 397
 398   void
 399   set_thread_count_initial(const char* arg)
 400   { this->thread_count_initial_ = this->parse_thread_count(arg); }
 401
 402   void
 403   set_thread_count_middle(const char* arg)
 404   { this->thread_count_initial_ = this->parse_thread_count(arg); }
 405
 406   void
 407   set_thread_count_final(const char* arg)
 408   { this->thread_count_initial_ = this->parse_thread_count(arg); }
 409
 410   void
 411   ignore(const char*)
 412   { }
 413
 414   void
 415   set_execstack()
 416   { this->execstack_ = EXECSTACK_YES; }
 417
 418   void
 419   set_noexecstack()
 420   { this->execstack_ = EXECSTACK_NO; }
 421
 422   // Handle the -z option.
 423   void
 424   handle_z_option(const char*);
 425
 426   // Apply any sysroot to the directory lists.
 427   void
 428   add_sysroot();
 429
 430   bool export_dynamic_;
 431   const char* dynamic_linker_;
 432   Dir_list search_path_;
 433   int optimization_level_;
 434   const char* output_file_name_;
 435   bool is_relocatable_;
 436   Strip strip_;
 437   bool allow_shlib_undefined_;
 438   bool symbolic_;
 439   bool detect_odr_violations_;
 440   bool create_eh_frame_hdr_;
 441   Dir_list rpath_;
 442   Dir_list rpath_link_;
 443   bool is_shared_;
 444   bool is_static_;
 445   bool print_stats_;
 446   std::string sysroot_;
 447   uint64_t text_segment_address_;
 448   bool threads_;
 449   int thread_count_initial_;
 450   int thread_count_middle_;
 451   int thread_count_final_;
 452   Execstack execstack_;
 453 };
 454
 455 // The current state of the position dependent options.
 456
 457 class Position_dependent_options
 458 {
 459  public:
 460   Position_dependent_options();
 461
 462   // -Bdynamic/-Bstatic: Whether we are searching for a static archive
 463   // -rather than a shared object.
 464   bool
 465   do_static_search() const
 466   { return this->do_static_search_; }
 467
 468   // --as-needed: Whether to add a DT_NEEDED argument only if the
 469   // dynamic object is used.
 470   bool
 471   as_needed() const
 472   { return this->as_needed_; }
 473
 474   // --whole-archive: Whether to include the entire contents of an
 475   // --archive.
 476   bool
 477   include_whole_archive() const
 478   { return this->include_whole_archive_; }
 479
 480   void
 481   set_static_search()
 482   { this->do_static_search_ = true; }
 483
 484   void
 485   set_dynamic_search()
 486   { this->do_static_search_ = false; }
 487
 488   void
 489   set_as_needed()
 490   { this->as_needed_ = true; }
 491
 492   void
 493   clear_as_needed()
 494   { this->as_needed_ = false; }
 495
 496   void
 497   set_whole_archive()
 498   { this->include_whole_archive_ = true; }
 499
 500   void
 501   clear_whole_archive()
 502   { this->include_whole_archive_ = false; }
 503
 504  private:
 505   bool do_static_search_;
 506   bool as_needed_;
 507   bool include_whole_archive_;
 508 };
 509
 510 // A single file or library argument from the command line.
 511
 512 class Input_file_argument
 513 {
 514  public:
 515   // name: file name or library name
 516   // is_lib: true if name is a library name: that is, emits the leading
 517   //         "lib" and trailing ".so"/".a" from the name
 518   // extra_search_path: an extra directory to look for the file, prior
 519   //         to checking the normal library search path.  If this is "",
 520   //         then no extra directory is added.
 521   // options: The position dependent options at this point in the
 522   //         command line, such as --whole-archive.
 523   Input_file_argument()
 524     : name_(), is_lib_(false), extra_search_path_(""), options_()
 525   { }
 526
 527   Input_file_argument(const char* name, bool is_lib,
 528                       const char* extra_search_path,
 529                       const Position_dependent_options& options)
 530     : name_(name), is_lib_(is_lib), extra_search_path_(extra_search_path),
 531       options_(options)
 532   { }
 533
 534   const char*
 535   name() const
 536   { return this->name_.c_str(); }
 537
 538   const Position_dependent_options&
 539   options() const
 540   { return this->options_; }
 541
 542   bool
 543   is_lib() const
 544   { return this->is_lib_; }
 545
 546   const char*
 547   extra_search_path() const
 548   {
 549     return (this->extra_search_path_.empty()
 550             ? NULL
 551             : this->extra_search_path_.c_str());
 552   }
 553
 554   // Return whether this file may require a search using the -L
 555   // options.
 556   bool
 557   may_need_search() const
 558   { return this->is_lib_ || !this->extra_search_path_.empty(); }
 559
 560  private:
 561   // We use std::string, not const char*, here for convenience when
 562   // using script files, so that we do not have to preserve the string
 563   // in that case.
 564   std::string name_;
 565   bool is_lib_;
 566   std::string extra_search_path_;
 567   Position_dependent_options options_;
 568 };
 569
 570 // A file or library, or a group, from the command line.
 571
 572 class Input_argument
 573 {
 574  public:
 575   // Create a file or library argument.
 576   explicit Input_argument(Input_file_argument file)
 577     : is_file_(true), file_(file), group_(NULL)
 578   { }
 579
 580   // Create a group argument.
 581   explicit Input_argument(Input_file_group* group)
 582     : is_file_(false), group_(group)
 583   { }
 584
 585   // Return whether this is a file.
 586   bool
 587   is_file() const
 588   { return this->is_file_; }
 589
 590   // Return whether this is a group.
 591   bool
 592   is_group() const
 593   { return !this->is_file_; }
 594
 595   // Return the information about the file.
 596   const Input_file_argument&
 597   file() const
 598   {
 599     gold_assert(this->is_file_);
 600     return this->file_;
 601   }
 602
 603   // Return the information about the group.
 604   const Input_file_group*
 605   group() const
 606   {
 607     gold_assert(!this->is_file_);
 608     return this->group_;
 609   }
 610
 611   Input_file_group*
 612   group()
 613   {
 614     gold_assert(!this->is_file_);
 615     return this->group_;
 616   }
 617
 618  private:
 619   bool is_file_;
 620   Input_file_argument file_;
 621   Input_file_group* group_;
 622 };
 623
 624 // A group from the command line.  This is a set of arguments within
 625 // --start-group ... --end-group.
 626
 627 class Input_file_group
 628 {
 629  public:
 630   typedef std::vector<Input_argument> Files;
 631   typedef Files::const_iterator const_iterator;
 632
 633   Input_file_group()
 634     : files_()
 635   { }
 636
 637   // Add a file to the end of the group.
 638   void
 639   add_file(const Input_file_argument& arg)
 640   { this->files_.push_back(Input_argument(arg)); }
 641
 642   // Iterators to iterate over the group contents.
 643
 644   const_iterator
 645   begin() const
 646   { return this->files_.begin(); }
 647
 648   const_iterator
 649   end() const
 650   { return this->files_.end(); }
 651
 652  private:
 653   Files files_;
 654 };
 655
 656 // A list of files from the command line or a script.
 657
 658 class Input_arguments
 659 {
 660  public:
 661   typedef std::vector<Input_argument> Input_argument_list;
 662   typedef Input_argument_list::const_iterator const_iterator;
 663
 664   Input_arguments()
 665     : input_argument_list_(), in_group_(false)
 666   { }
 667
 668   // Add a file.
 669   void
 670   add_file(const Input_file_argument& arg);
 671
 672   // Start a group (the --start-group option).
 673   void
 674   start_group();
 675
 676   // End a group (the --end-group option).
 677   void
 678   end_group();
 679
 680   // Return whether we are currently in a group.
 681   bool
 682   in_group() const
 683   { return this->in_group_; }
 684
 685   // The number of entries in the list.
 686   int
 687   size() const
 688   { return this->input_argument_list_.size(); }
 689
 690   // Iterators to iterate over the list of input files.
 691
 692   const_iterator
 693   begin() const
 694   { return this->input_argument_list_.begin(); }
 695
 696   const_iterator
 697   end() const
 698   { return this->input_argument_list_.end(); }
 699
 700   // Return whether the list is empty.
 701   bool
 702   empty() const
 703   { return this->input_argument_list_.empty(); }
 704
 705  private:
 706   Input_argument_list input_argument_list_;
 707   bool in_group_;
 708 };
 709
 710 // All the information read from the command line.
 711
 712 class Command_line
 713 {
 714  public:
 715   typedef Input_arguments::const_iterator const_iterator;
 716
 717   Command_line();
 718
 719   // Process the command line options.  This will exit with an
 720   // appropriate error message if an unrecognized option is seen.
 721   void
 722   process(int argc, char** argv);
 723
 724   // Process one command-line option.  This takes the index of argv to
 725   // process, and returns the index for the next option.
 726   int
 727   process_one_option(int argc, char** argv, int i, bool* no_more_options);
 728
 729   // Handle a -l option.
 730   int
 731   process_l_option(int, char**, char*, bool);
 732
 733   // Handle a --start-group option.
 734   void
 735   start_group(const char* arg);
 736
 737   // Handle a --end-group option.
 738   void
 739   end_group(const char* arg);
 740
 741   // Get an option argument--a helper function for special processing.
 742   const char*
 743   get_special_argument(const char* longname, int argc, char** argv,
 744                        const char* arg, bool long_option,
 745                        int *pret);
 746
 747   // Get the general options.
 748   const General_options&
 749   options() const
 750   { return this->options_; }
 751
 752   // Get the position dependent options.
 753   const Position_dependent_options&
 754   position_dependent_options() const
 755   { return this->position_options_; }
 756
 757   // The number of input files.
 758   int
 759   number_of_input_files() const
 760   { return this->inputs_.size(); }
 761
 762   // Iterators to iterate over the list of input files.
 763
 764   const_iterator
 765   begin() const
 766   { return this->inputs_.begin(); }
 767
 768   const_iterator
 769   end() const
 770   { return this->inputs_.end(); }
 771
 772  private:
 773   Command_line(const Command_line&);
 774   Command_line& operator=(const Command_line&);
 775
 776   // Report usage error.
 777   void
 778   usage() ATTRIBUTE_NORETURN;
 779   void
 780   usage(const char* msg, const char* opt) ATTRIBUTE_NORETURN;
 781   void
 782   usage(const char* msg, char opt) ATTRIBUTE_NORETURN;
 783
 784   // Apply a command line option.
 785   void
 786   apply_option(const gold::options::One_option&, const char*);
 787
 788   // Add a file.
 789   void
 790   add_file(const char* name, bool is_lib);
 791
 792   // Examine the result of processing the command-line, and verify
 793   // the flags do not contradict each other or are otherwise illegal.
 794   void
 795   normalize_options();
 796
 797   General_options options_;
 798   Position_dependent_options position_options_;
 799   Input_arguments inputs_;
 800 };
 801
 802 } // End namespace gold.
 803
 804 #endif // !defined(GOLD_OPTIONS_H)