gold/options.h

   1 // options.h -- handle command line options for gold  -*- C++ -*-
   2
   3 // Copyright 2006, 2007, 2008 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 "elfcpp.h"
  41 #include "script.h"
  42
  43 namespace gold
  44 {
  45
  46 class Command_line;
  47 class Input_file_group;
  48 class Position_dependent_options;
  49 class Target;
  50
  51 namespace options
  52 {
  53
  54 class Command_line_options;
  55 struct One_option;
  56 struct One_z_option;
  57 struct One_debug_option;
  58
  59 } // End namespace gold::options.
  60
  61 // A directory to search.  For each directory we record whether it is
  62 // in the sysroot.  We need to know this so that, if a linker script
  63 // is found within the sysroot, we will apply the sysroot to any files
  64 // named by that script.
  65
  66 class Search_directory
  67 {
  68  public:
  69   // We need a default constructor because we put this in a
  70   // std::vector.
  71   Search_directory()
  72     : name_(NULL), put_in_sysroot_(false), is_in_sysroot_(false)
  73   { }
  74
  75   // This is the usual constructor.
  76   Search_directory(const char* name, bool put_in_sysroot)
  77     : name_(name), put_in_sysroot_(put_in_sysroot), is_in_sysroot_(false)
  78   {
  79     if (this->name_.empty())
  80       this->name_ = ".";
  81   }
  82
  83   // This is called if we have a sysroot.  The sysroot is prefixed to
  84   // any entries for which put_in_sysroot_ is true.  is_in_sysroot_ is
  85   // set to true for any enries which are in the sysroot (this will
  86   // naturally include any entries for which put_in_sysroot_ is true).
  87   // SYSROOT is the sysroot, CANONICAL_SYSROOT is the result of
  88   // passing SYSROOT to lrealpath.
  89   void
  90   add_sysroot(const char* sysroot, const char* canonical_sysroot);
  91
  92   // Get the directory name.
  93   const std::string&
  94   name() const
  95   { return this->name_; }
  96
  97   // Return whether this directory is in the sysroot.
  98   bool
  99   is_in_sysroot() const
 100   { return this->is_in_sysroot_; }
 101
 102  private:
 103   std::string name_;
 104   bool put_in_sysroot_;
 105   bool is_in_sysroot_;
 106 };
 107
 108 // The position independent options which apply to the whole link.
 109 // There are a lot of them.
 110
 111 class General_options
 112 {
 113  public:
 114   enum Object_format
 115   {
 116     // Ordinary ELF.
 117     OBJECT_FORMAT_ELF,
 118     // Straight binary format.
 119     OBJECT_FORMAT_BINARY
 120   };
 121
 122   General_options(Script_options*);
 123
 124   // -e: set entry address.
 125   const char*
 126   entry() const
 127   { return this->script_options_->entry(); }
 128
 129   // -E: export dynamic symbols.
 130   bool
 131   export_dynamic() const
 132   { return this->export_dynamic_; }
 133
 134   // -h: shared library name.
 135   const char*
 136   soname() const
 137   { return this->soname_; }
 138
 139   // -I: dynamic linker name.
 140   const char*
 141   dynamic_linker() const
 142   { return this->dynamic_linker_; }
 143
 144   // -L: Library search path.
 145   typedef std::vector<Search_directory> Dir_list;
 146
 147   const Dir_list&
 148   search_path() const
 149   { return this->search_path_; }
 150
 151   // -O: optimization level (0: don't try to optimize output size).
 152   int
 153   optimize() const
 154   { return this->optimization_level_; }
 155
 156   // -o: Output file name.
 157   const char*
 158   output_file_name() const
 159   { return this->output_file_name_; }
 160
 161   // --oformat: Output format.
 162   Object_format
 163   oformat() const
 164   { return this->oformat_; }
 165
 166   // Return the default target.
 167   Target*
 168   default_target() const;
 169
 170   // -r: Whether we are doing a relocatable link.
 171   bool
 172   relocatable() const
 173   { return this->is_relocatable_; }
 174
 175   // -s: Strip all symbols.
 176   bool
 177   strip_all() const
 178   { return this->strip_ == STRIP_ALL; }
 179
 180   // -S: Strip debugging information.
 181   bool
 182   strip_debug() const
 183   { return this->strip_ == STRIP_ALL || this->strip_ == STRIP_DEBUG; }
 184
 185   // --strip-debug-gdb: strip only debugging information that's not
 186   // used by gdb (at least, for gdb versions <= 6.7).
 187   bool
 188   strip_debug_gdb() const
 189   { return this->strip_debug() || this->strip_ == STRIP_DEBUG_UNUSED_BY_GDB; }
 190
 191   // --allow-shlib-undefined: do not warn about unresolved symbols in
 192   // --shared libraries.
 193   bool
 194   allow_shlib_undefined() const
 195   { return this->allow_shlib_undefined_; }
 196
 197   // -Bsymbolic: bind defined symbols locally.
 198   bool
 199   Bsymbolic() const
 200   { return this->symbolic_; }
 201
 202   // --compress-debug-sections: compress .debug_* sections in the
 203   // output file using the given compression method.  This is useful
 204   // when the tools (such as gdb) support compressed sections.
 205   bool
 206   compress_debug_sections() const
 207   { return this->compress_debug_sections_ != NO_COMPRESSION; }
 208
 209   bool
 210   zlib_compress_debug_sections() const
 211   { return this->compress_debug_sections_ == ZLIB_COMPRESSION; }
 212
 213   // --demangle: demangle C++ symbols in our log messages.
 214   bool
 215   demangle() const
 216   { return this->demangle_; }
 217
 218   // --detect-odr-violations: Whether to search for One Defn Rule violations.
 219   bool
 220   detect_odr_violations() const
 221   { return this->detect_odr_violations_; }
 222
 223   // --eh-frame-hdr: Whether to generate an exception frame header.
 224   bool
 225   eh_frame_hdr() const
 226   { return this->create_eh_frame_hdr_; }
 227
 228   // --rpath: The runtime search path.
 229   const Dir_list&
 230   rpath() const
 231   { return this->rpath_; }
 232
 233   // --rpath-link: The link time search patch for shared libraries.
 234   const Dir_list&
 235   rpath_link() const
 236   { return this->rpath_link_; }
 237
 238   // --shared: Whether generating a shared object.
 239   bool
 240   shared() const
 241   { return this->is_shared_; }
 242
 243   // --static: Whether doing a static link.
 244   bool
 245   is_static() const
 246   { return this->is_static_; }
 247
 248   // --stats: Print resource usage statistics.
 249   bool
 250   print_stats() const
 251   { return this->print_stats_; }
 252
 253   // --sysroot: The system root of a cross-linker.
 254   const std::string&
 255   sysroot() const
 256   { return this->sysroot_; }
 257
 258   // --version-script: The version script to apply if --shared is true.
 259   const Version_script_info&
 260   version_script() const
 261   { return *this->script_options_->version_script_info(); }
 262
 263   // -Tbss: The address of the BSS segment
 264   uint64_t
 265   Tbss() const
 266   { return this->bss_segment_address_; }
 267
 268   // Whether -Tbss was used.
 269   bool
 270   user_set_Tbss() const
 271   { return this->bss_segment_address_ != -1U; }
 272
 273   // -Tdata: The address of the data segment
 274   uint64_t
 275   Tdata() const
 276   { return this->data_segment_address_; }
 277
 278   // Whether -Tdata was used.
 279   bool
 280   user_set_Tdata() const
 281   { return this->data_segment_address_ != -1U; }
 282
 283   // -Ttext: The address of the .text section
 284   uint64_t
 285   Ttext() const
 286   { return this->text_segment_address_; }
 287
 288   // Whether -Ttext was used.
 289   bool
 290   user_set_Ttext() const
 291   { return this->text_segment_address_ != -1U; }
 292
 293   // --threads: Whether to use threads.
 294   bool
 295   threads() const
 296   { return this->threads_; }
 297
 298   // --thread-count-initial: Threads to use in initial pass.
 299   int
 300   thread_count_initial() const
 301   { return this->thread_count_initial_; }
 302
 303   // --thread-count-middle: Threads to use in middle pass.
 304   int
 305   thread_count_middle() const
 306   { return this->thread_count_middle_; }
 307
 308   // --thread-count-final: Threads to use in final pass.
 309   int
 310   thread_count_final() const
 311   { return this->thread_count_final_; }
 312
 313   // -z execstack, -z noexecstack
 314   bool
 315   is_execstack_set() const
 316   { return this->execstack_ != EXECSTACK_FROM_INPUT; }
 317
 318   bool
 319   is_stack_executable() const
 320   { return this->execstack_ == EXECSTACK_YES; }
 321
 322   // --debug
 323   unsigned int
 324   debug() const
 325   { return this->debug_; }
 326
 327   // Return the options which may be set from a linker script.
 328   Script_options*
 329   script_options()
 330   { return this->script_options_; }
 331
 332   const Script_options*
 333   script_options() const
 334   { return this->script_options_; }
 335
 336  private:
 337   // Don't copy this structure.
 338   General_options(const General_options&);
 339   General_options& operator=(const General_options&);
 340
 341   friend class Command_line;
 342   friend class options::Command_line_options;
 343
 344   // Which symbols to strip.
 345   enum Strip
 346   {
 347     // Don't strip any symbols.
 348     STRIP_NONE,
 349     // Strip all symbols.
 350     STRIP_ALL,
 351     // Strip debugging information.
 352     STRIP_DEBUG,
 353     // Strip debugging information that's not used by gdb (at least <= 6.7)
 354     STRIP_DEBUG_UNUSED_BY_GDB
 355   };
 356
 357   // Whether to mark the stack as executable.
 358   enum Execstack
 359   {
 360     // Not set on command line.
 361     EXECSTACK_FROM_INPUT,
 362     // Mark the stack as executable.
 363     EXECSTACK_YES,
 364     // Mark the stack as not executable.
 365     EXECSTACK_NO
 366   };
 367
 368   // What compression method to use
 369   enum CompressionMethod
 370   {
 371     NO_COMPRESSION,
 372     ZLIB_COMPRESSION,
 373   };
 374
 375   void
 376   set_entry(const char* arg)
 377   { this->script_options_->set_entry(arg, strlen(arg)); }
 378
 379   void
 380   set_export_dynamic(bool value)
 381   { this->export_dynamic_ = value; }
 382
 383   void
 384   set_soname(const char* arg)
 385   { this->soname_ = arg; }
 386
 387   void
 388   set_dynamic_linker(const char* arg)
 389   { this->dynamic_linker_ = arg; }
 390
 391   void
 392   add_to_search_path(const char* arg)
 393   { this->search_path_.push_back(Search_directory(arg, false)); }
 394
 395   void
 396   add_to_search_path_with_sysroot(const char* arg)
 397   { this->search_path_.push_back(Search_directory(arg, true)); }
 398
 399   void
 400   set_optimize(const char* arg)
 401   {
 402     char* endptr;
 403     this->optimization_level_ = strtol(arg, &endptr, 0);
 404     if (*endptr != '\0' || this->optimization_level_ < 0)
 405       gold_fatal(_("invalid optimization level: %s"), arg);
 406   }
 407
 408   void
 409   set_output(const char* arg)
 410   { this->output_file_name_ = arg; }
 411
 412   void
 413   set_oformat(const char*);
 414
 415   void
 416   set_relocatable(bool value)
 417   { this->is_relocatable_ = value; }
 418
 419   void
 420   set_strip_all(bool)
 421   { this->strip_ = STRIP_ALL; }
 422
 423   // Note: normalize_options() depends on the fact that this turns off
 424   // STRIP_ALL if it were already set.
 425   void
 426   set_strip_debug(bool)
 427   { this->strip_ = STRIP_DEBUG; }
 428
 429   void
 430   set_strip_debug_gdb(bool)
 431   { this->strip_ = STRIP_DEBUG_UNUSED_BY_GDB; }
 432
 433   void
 434   set_allow_shlib_undefined(bool value)
 435   { this->allow_shlib_undefined_ = value; }
 436
 437   void
 438   set_no_allow_shlib_undefined(bool value)
 439   { this->set_allow_shlib_undefined(!value); }
 440
 441   void
 442   set_Bsymbolic(bool value)
 443   { this->symbolic_ = value; }
 444
 445   void set_compress_debug_sections(const char* arg)
 446   {
 447     if (strcmp(arg, "none") == 0)
 448       this->compress_debug_sections_ = NO_COMPRESSION;
 449 #ifdef HAVE_ZLIB_H
 450     else if (strcmp(arg, "zlib") == 0)
 451       this->compress_debug_sections_ = ZLIB_COMPRESSION;
 452 #endif
 453     else
 454       gold_fatal(_("unsupported argument to --compress-debug-sections: %s"),
 455                  arg);
 456   }
 457
 458   void
 459   add_to_defsym(const char* arg);
 460
 461   void
 462   set_demangle(bool value)
 463   { this->demangle_ = value; }
 464
 465   void
 466   set_no_demangle(bool value)
 467   { this->set_demangle(!value); }
 468
 469   void
 470   set_detect_odr_violations(bool value)
 471   { this->detect_odr_violations_ = value; }
 472
 473   void
 474   set_eh_frame_hdr(bool value)
 475   { this->create_eh_frame_hdr_ = value; }
 476
 477   void
 478   add_to_rpath(const char* arg)
 479   { this->rpath_.push_back(Search_directory(arg, false)); }
 480
 481   void
 482   add_to_rpath_link(const char* arg)
 483   { this->rpath_link_.push_back(Search_directory(arg, false)); }
 484
 485   void
 486   set_shared(bool value)
 487   { this->is_shared_ = value; }
 488
 489   void
 490   set_static(bool value)
 491   { this->is_static_ = value; }
 492
 493   void
 494   set_stats(bool value)
 495   { this->print_stats_ = value; }
 496
 497   void
 498   set_sysroot(const char* arg)
 499   { this->sysroot_ = arg; }
 500
 501   void
 502   set_segment_address(const char* name, const char* arg, uint64_t* val)
 503   {
 504     char* endptr;
 505     *val = strtoull(arg, &endptr, 0);
 506     if (*endptr != '\0' || *val == -1U)
 507       gold_fatal(_("invalid argument to %s: %s"), name, arg);
 508   }
 509
 510   void
 511   set_Tbss(const char* arg)
 512   { this->set_segment_address("-Tbss", arg, &this->bss_segment_address_); }
 513
 514   void
 515   set_Tdata(const char* arg)
 516   { this->set_segment_address("-Tdata", arg, &this->data_segment_address_); }
 517
 518   void
 519   set_Ttext(const char* arg)
 520   { this->set_segment_address("-Ttext", arg, &this->text_segment_address_); }
 521
 522   int
 523   parse_thread_count(const char* arg)
 524   {
 525     char* endptr;
 526     const int count = strtol(arg, &endptr, 0);
 527     if (*endptr != '\0' || count < 0)
 528       gold_fatal(_("invalid thread count: %s"), arg);
 529     return count;
 530   }
 531
 532   void
 533   set_threads(bool value)
 534   {
 535 #ifndef ENABLE_THREADS
 536     if (value)
 537       gold_fatal(_("--threads not supported"));
 538 #endif
 539     this->threads_ = value;
 540   }
 541
 542   void
 543   set_no_threads(bool value)
 544   { this->set_threads(!value); }
 545
 546   void
 547   set_thread_count(const char* arg)
 548   {
 549     int count = this->parse_thread_count(arg);
 550     this->thread_count_initial_ = count;
 551     this->thread_count_middle_ = count;
 552     this->thread_count_final_ = count;
 553   }
 554
 555   void
 556   set_thread_count_initial(const char* arg)
 557   { this->thread_count_initial_ = this->parse_thread_count(arg); }
 558
 559   void
 560   set_thread_count_middle(const char* arg)
 561   { this->thread_count_middle_ = this->parse_thread_count(arg); }
 562
 563   void
 564   set_thread_count_final(const char* arg)
 565   { this->thread_count_final_ = this->parse_thread_count(arg); }
 566
 567   void
 568   ignore(const char*)
 569   { }
 570
 571   void
 572   set_execstack(bool)
 573   { this->execstack_ = EXECSTACK_YES; }
 574
 575   void
 576   set_noexecstack(bool)
 577   { this->execstack_ = EXECSTACK_NO; }
 578
 579   void
 580   set_debug(unsigned int flags)
 581   { this->debug_ = flags; }
 582
 583   // Handle the -z option.
 584   void
 585   handle_z_option(const char*);
 586
 587   // Handle the --debug option.
 588   void
 589   handle_debug_option(const char*);
 590
 591   // Apply any sysroot to the directory lists.
 592   void
 593   add_sysroot();
 594
 595   bool export_dynamic_;
 596   const char* soname_;
 597   const char* dynamic_linker_;
 598   Dir_list search_path_;
 599   int optimization_level_;
 600   const char* output_file_name_;
 601   Object_format oformat_;
 602   const char* oformat_string_;
 603   bool is_relocatable_;
 604   Strip strip_;
 605   bool allow_shlib_undefined_;
 606   bool symbolic_;
 607   CompressionMethod compress_debug_sections_;
 608   bool demangle_;
 609   bool detect_odr_violations_;
 610   bool create_eh_frame_hdr_;
 611   Dir_list rpath_;
 612   Dir_list rpath_link_;
 613   bool is_shared_;
 614   bool is_static_;
 615   bool print_stats_;
 616   std::string sysroot_;
 617   uint64_t bss_segment_address_;
 618   uint64_t data_segment_address_;
 619   uint64_t text_segment_address_;
 620   bool threads_;
 621   int thread_count_initial_;
 622   int thread_count_middle_;
 623   int thread_count_final_;
 624   Execstack execstack_;
 625   unsigned int debug_;
 626   // Some options can also be set from linker scripts.  Those are
 627   // stored here.
 628   Script_options* script_options_;
 629 };
 630
 631 // The current state of the position dependent options.
 632
 633 class Position_dependent_options
 634 {
 635  public:
 636   typedef General_options::Object_format Object_format;
 637
 638   Position_dependent_options();
 639
 640   // -Bdynamic/-Bstatic: Whether we are searching for a static archive
 641   // -rather than a shared object.
 642   bool
 643   Bstatic() const
 644   { return this->do_static_search_; }
 645
 646   // --as-needed: Whether to add a DT_NEEDED argument only if the
 647   // dynamic object is used.
 648   bool
 649   as_needed() const
 650   { return this->as_needed_; }
 651
 652   // --whole-archive: Whether to include the entire contents of an
 653   // --archive.
 654   bool
 655   whole_archive() const
 656   { return this->include_whole_archive_; }
 657
 658   // --format: The format of the input file.
 659   Object_format
 660   format() const
 661   { return this->input_format_; }
 662
 663   void
 664   set_Bstatic(bool value)
 665   { this->do_static_search_ = value; }
 666
 667   void
 668   set_Bdynamic(bool value)
 669   { this->set_Bstatic(!value); }
 670
 671   void
 672   set_as_needed(bool value)
 673   { this->as_needed_ = value; }
 674
 675   void
 676   set_no_as_needed(bool value)
 677   { this->set_as_needed(!value); }
 678
 679   void
 680   set_whole_archive(bool value)
 681   { this->include_whole_archive_ = value; }
 682
 683   void
 684   set_no_whole_archive(bool value)
 685   { this->set_whole_archive(!value); }
 686
 687   void
 688   set_format(const char*);
 689
 690  private:
 691   bool do_static_search_;
 692   bool as_needed_;
 693   bool include_whole_archive_;
 694   Object_format input_format_;
 695 };
 696
 697 // A single file or library argument from the command line.
 698
 699 class Input_file_argument
 700 {
 701  public:
 702   // name: file name or library name
 703   // is_lib: true if name is a library name: that is, emits the leading
 704   //         "lib" and trailing ".so"/".a" from the name
 705   // extra_search_path: an extra directory to look for the file, prior
 706   //         to checking the normal library search path.  If this is "",
 707   //         then no extra directory is added.
 708   // just_symbols: whether this file only defines symbols.
 709   // options: The position dependent options at this point in the
 710   //         command line, such as --whole-archive.
 711   Input_file_argument()
 712     : name_(), is_lib_(false), extra_search_path_(""), just_symbols_(false),
 713       options_()
 714   { }
 715
 716   Input_file_argument(const char* name, bool is_lib,
 717                       const char* extra_search_path,
 718                       bool just_symbols,
 719                       const Position_dependent_options& options)
 720     : name_(name), is_lib_(is_lib), extra_search_path_(extra_search_path),
 721       just_symbols_(just_symbols), options_(options)
 722   { }
 723
 724   const char*
 725   name() const
 726   { return this->name_.c_str(); }
 727
 728   const Position_dependent_options&
 729   options() const
 730   { return this->options_; }
 731
 732   bool
 733   is_lib() const
 734   { return this->is_lib_; }
 735
 736   const char*
 737   extra_search_path() const
 738   {
 739     return (this->extra_search_path_.empty()
 740             ? NULL
 741             : this->extra_search_path_.c_str());
 742   }
 743
 744   // Return whether we should only read symbols from this file.
 745   bool
 746   just_symbols() const
 747   { return this->just_symbols_; }
 748
 749   // Return whether this file may require a search using the -L
 750   // options.
 751   bool
 752   may_need_search() const
 753   { return this->is_lib_ || !this->extra_search_path_.empty(); }
 754
 755  private:
 756   // We use std::string, not const char*, here for convenience when
 757   // using script files, so that we do not have to preserve the string
 758   // in that case.
 759   std::string name_;
 760   bool is_lib_;
 761   std::string extra_search_path_;
 762   bool just_symbols_;
 763   Position_dependent_options options_;
 764 };
 765
 766 // A file or library, or a group, from the command line.
 767
 768 class Input_argument
 769 {
 770  public:
 771   // Create a file or library argument.
 772   explicit Input_argument(Input_file_argument file)
 773     : is_file_(true), file_(file), group_(NULL)
 774   { }
 775
 776   // Create a group argument.
 777   explicit Input_argument(Input_file_group* group)
 778     : is_file_(false), group_(group)
 779   { }
 780
 781   // Return whether this is a file.
 782   bool
 783   is_file() const
 784   { return this->is_file_; }
 785
 786   // Return whether this is a group.
 787   bool
 788   is_group() const
 789   { return !this->is_file_; }
 790
 791   // Return the information about the file.
 792   const Input_file_argument&
 793   file() const
 794   {
 795     gold_assert(this->is_file_);
 796     return this->file_;
 797   }
 798
 799   // Return the information about the group.
 800   const Input_file_group*
 801   group() const
 802   {
 803     gold_assert(!this->is_file_);
 804     return this->group_;
 805   }
 806
 807   Input_file_group*
 808   group()
 809   {
 810     gold_assert(!this->is_file_);
 811     return this->group_;
 812   }
 813
 814  private:
 815   bool is_file_;
 816   Input_file_argument file_;
 817   Input_file_group* group_;
 818 };
 819
 820 // A group from the command line.  This is a set of arguments within
 821 // --start-group ... --end-group.
 822
 823 class Input_file_group
 824 {
 825  public:
 826   typedef std::vector<Input_argument> Files;
 827   typedef Files::const_iterator const_iterator;
 828
 829   Input_file_group()
 830     : files_()
 831   { }
 832
 833   // Add a file to the end of the group.
 834   void
 835   add_file(const Input_file_argument& arg)
 836   { this->files_.push_back(Input_argument(arg)); }
 837
 838   // Iterators to iterate over the group contents.
 839
 840   const_iterator
 841   begin() const
 842   { return this->files_.begin(); }
 843
 844   const_iterator
 845   end() const
 846   { return this->files_.end(); }
 847
 848  private:
 849   Files files_;
 850 };
 851
 852 // A list of files from the command line or a script.
 853
 854 class Input_arguments
 855 {
 856  public:
 857   typedef std::vector<Input_argument> Input_argument_list;
 858   typedef Input_argument_list::const_iterator const_iterator;
 859
 860   Input_arguments()
 861     : input_argument_list_(), in_group_(false)
 862   { }
 863
 864   // Add a file.
 865   void
 866   add_file(const Input_file_argument& arg);
 867
 868   // Start a group (the --start-group option).
 869   void
 870   start_group();
 871
 872   // End a group (the --end-group option).
 873   void
 874   end_group();
 875
 876   // Return whether we are currently in a group.
 877   bool
 878   in_group() const
 879   { return this->in_group_; }
 880
 881   // The number of entries in the list.
 882   int
 883   size() const
 884   { return this->input_argument_list_.size(); }
 885
 886   // Iterators to iterate over the list of input files.
 887
 888   const_iterator
 889   begin() const
 890   { return this->input_argument_list_.begin(); }
 891
 892   const_iterator
 893   end() const
 894   { return this->input_argument_list_.end(); }
 895
 896   // Return whether the list is empty.
 897   bool
 898   empty() const
 899   { return this->input_argument_list_.empty(); }
 900
 901  private:
 902   Input_argument_list input_argument_list_;
 903   bool in_group_;
 904 };
 905
 906 // All the information read from the command line.
 907
 908 class Command_line
 909 {
 910  public:
 911   typedef Input_arguments::const_iterator const_iterator;
 912
 913   Command_line(Script_options*);
 914
 915   // Process the command line options.  This will exit with an
 916   // appropriate error message if an unrecognized option is seen.
 917   void
 918   process(int argc, char** argv);
 919
 920   // Process one command-line option.  This takes the index of argv to
 921   // process, and returns the index for the next option.
 922   int
 923   process_one_option(int argc, char** argv, int i, bool* no_more_options);
 924
 925   // Handle a -l option.
 926   int
 927   process_l_option(int, char**, char*, bool);
 928
 929   // Handle a -R option when it means --rpath.
 930   void
 931   add_to_rpath(const char* arg)
 932   { this->options_.add_to_rpath(arg); }
 933
 934   // Add a file for which we just read the symbols.
 935   void
 936   add_just_symbols_file(const char* arg)
 937   {
 938     this->inputs_.add_file(Input_file_argument(arg, false, "", true,
 939                                                this->position_options_));
 940   }
 941
 942   // Handle a --start-group option.
 943   void
 944   start_group(const char* arg);
 945
 946   // Handle a --end-group option.
 947   void
 948   end_group(const char* arg);
 949
 950   // Get an option argument--a helper function for special processing.
 951   const char*
 952   get_special_argument(const char* longname, int argc, char** argv,
 953                        const char* arg, bool long_option,
 954                        int *pret);
 955
 956   // Get the general options.
 957   const General_options&
 958   options() const
 959   { return this->options_; }
 960
 961   // Get the position dependent options.
 962   const Position_dependent_options&
 963   position_dependent_options() const
 964   { return this->position_options_; }
 965
 966   // Get the options which may be set from a linker script.
 967   Script_options*
 968   script_options()
 969   { return this->options_.script_options(); }
 970
 971   const Script_options*
 972   script_options() const
 973   { return this->options_.script_options(); }
 974
 975   // The number of input files.
 976   int
 977   number_of_input_files() const
 978   { return this->inputs_.size(); }
 979
 980   // Iterators to iterate over the list of input files.
 981
 982   const_iterator
 983   begin() const
 984   { return this->inputs_.begin(); }
 985
 986   const_iterator
 987   end() const
 988   { return this->inputs_.end(); }
 989
 990  private:
 991   Command_line(const Command_line&);
 992   Command_line& operator=(const Command_line&);
 993
 994   // Report usage error.
 995   void
 996   usage() ATTRIBUTE_NORETURN;
 997   void
 998   usage(const char* msg, const char* opt) ATTRIBUTE_NORETURN;
 999   void
1000   usage(const char* msg, char opt) ATTRIBUTE_NORETURN;
1001
1002   // Apply a command line option.
1003   void
1004   apply_option(const gold::options::One_option&, const char*);
1005
1006   // Add a file.
1007   void
1008   add_file(const char* name, bool is_lib);
1009
1010   // Examine the result of processing the command-line, and verify
1011   // the flags do not contradict each other or are otherwise illegal.
1012   void
1013   normalize_options();
1014
1015   General_options options_;
1016   Position_dependent_options position_options_;
1017   Input_arguments inputs_;
1018 };
1019
1020 } // End namespace gold.
1021
1022 #endif // !defined(GOLD_OPTIONS_H)