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();
 123
 124   // -e: set entry address.
 125   const char*
 126   entry() const
 127   { return this->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   // -q: Whether to emit relocations.
 171   bool
 172   emit_relocs() const
 173   { return this->emit_relocs_; }
 174
 175   // -r: Whether we are doing a relocatable link.
 176   bool
 177   relocatable() const
 178   { return this->is_relocatable_; }
 179
 180   // -s: Strip all symbols.
 181   bool
 182   strip_all() const
 183   { return this->strip_ == STRIP_ALL; }
 184
 185   // -S: Strip debugging information.
 186   bool
 187   strip_debug() const
 188   { return this->strip_ == STRIP_ALL || this->strip_ == STRIP_DEBUG; }
 189
 190   // --strip-debug-gdb: strip only debugging information that's not
 191   // used by gdb (at least, for gdb versions <= 6.7).
 192   bool
 193   strip_debug_gdb() const
 194   { return this->strip_debug() || this->strip_ == STRIP_DEBUG_UNUSED_BY_GDB; }
 195
 196   // --allow-shlib-undefined: do not warn about unresolved symbols in
 197   // --shared libraries.
 198   bool
 199   allow_shlib_undefined() const
 200   { return this->allow_shlib_undefined_; }
 201
 202   // -Bsymbolic: bind defined symbols locally.
 203   bool
 204   Bsymbolic() const
 205   { return this->symbolic_; }
 206
 207   // --compress-debug-sections: compress .debug_* sections in the
 208   // output file using the given compression method.  This is useful
 209   // when the tools (such as gdb) support compressed sections.
 210   bool
 211   compress_debug_sections() const
 212   { return this->compress_debug_sections_ != NO_COMPRESSION; }
 213
 214   bool
 215   zlib_compress_debug_sections() const
 216   { return this->compress_debug_sections_ == ZLIB_COMPRESSION; }
 217
 218   // --demangle: demangle C++ symbols in our log messages.
 219   bool
 220   demangle() const
 221   { return this->demangle_; }
 222
 223   // --detect-odr-violations: Whether to search for One Defn Rule violations.
 224   bool
 225   detect_odr_violations() const
 226   { return this->detect_odr_violations_; }
 227
 228   // --eh-frame-hdr: Whether to generate an exception frame header.
 229   bool
 230   eh_frame_hdr() const
 231   { return this->create_eh_frame_hdr_; }
 232
 233   // --rpath: The runtime search path.
 234   const Dir_list&
 235   rpath() const
 236   { return this->rpath_; }
 237
 238   // --rpath-link: The link time search patch for shared libraries.
 239   const Dir_list&
 240   rpath_link() const
 241   { return this->rpath_link_; }
 242
 243   // --shared: Whether generating a shared object.
 244   bool
 245   shared() const
 246   { return this->is_shared_; }
 247
 248   // --static: Whether doing a static link.
 249   bool
 250   is_static() const
 251   { return this->is_static_; }
 252
 253   // --stats: Print resource usage statistics.
 254   bool
 255   print_stats() const
 256   { return this->print_stats_; }
 257
 258   // --sysroot: The system root of a cross-linker.
 259   const std::string&
 260   sysroot() const
 261   { return this->sysroot_; }
 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   // -z max-page-size
 323   uint64_t
 324   max_page_size() const
 325   { return this->max_page_size_; }
 326
 327   // -z common-page-size
 328   uint64_t
 329   common_page_size() const
 330   { return this->common_page_size_; }
 331
 332   // --debug
 333   unsigned int
 334   debug() const
 335   { return this->debug_; }
 336
 337  private:
 338   // Don't copy this structure.
 339   General_options(const General_options&);
 340   General_options& operator=(const General_options&);
 341
 342   friend class Command_line;
 343   friend class options::Command_line_options;
 344
 345   // Which symbols to strip.
 346   enum Strip
 347   {
 348     // Don't strip any symbols.
 349     STRIP_NONE,
 350     // Strip all symbols.
 351     STRIP_ALL,
 352     // Strip debugging information.
 353     STRIP_DEBUG,
 354     // Strip debugging information that's not used by gdb (at least <= 6.7)
 355     STRIP_DEBUG_UNUSED_BY_GDB
 356   };
 357
 358   // Whether to mark the stack as executable.
 359   enum Execstack
 360   {
 361     // Not set on command line.
 362     EXECSTACK_FROM_INPUT,
 363     // Mark the stack as executable.
 364     EXECSTACK_YES,
 365     // Mark the stack as not executable.
 366     EXECSTACK_NO
 367   };
 368
 369   // What compression method to use
 370   enum CompressionMethod
 371   {
 372     NO_COMPRESSION,
 373     ZLIB_COMPRESSION,
 374   };
 375
 376   void
 377   set_entry(const char* arg)
 378   { this->entry_ = arg; }
 379
 380   void
 381   set_export_dynamic(bool value)
 382   { this->export_dynamic_ = value; }
 383
 384   void
 385   set_soname(const char* arg)
 386   { this->soname_ = arg; }
 387
 388   void
 389   set_dynamic_linker(const char* arg)
 390   { this->dynamic_linker_ = arg; }
 391
 392   void
 393   add_to_search_path(const char* arg)
 394   { this->search_path_.push_back(Search_directory(arg, false)); }
 395
 396   void
 397   add_to_search_path_with_sysroot(const char* arg)
 398   { this->search_path_.push_back(Search_directory(arg, true)); }
 399
 400   void
 401   set_optimize(const char* arg)
 402   {
 403     char* endptr;
 404     this->optimization_level_ = strtol(arg, &endptr, 0);
 405     if (*endptr != '\0' || this->optimization_level_ < 0)
 406       gold_fatal(_("invalid optimization level: %s"), arg);
 407   }
 408
 409   void
 410   set_output(const char* arg)
 411   { this->output_file_name_ = arg; }
 412
 413   void
 414   set_oformat(const char*);
 415
 416   void
 417   set_emit_relocs(bool value)
 418   { this->emit_relocs_ = value; }
 419
 420   void
 421   set_relocatable(bool value)
 422   { this->is_relocatable_ = value; }
 423
 424   void
 425   set_strip_all(bool)
 426   { this->strip_ = STRIP_ALL; }
 427
 428   // Note: normalize_options() depends on the fact that this turns off
 429   // STRIP_ALL if it were already set.
 430   void
 431   set_strip_debug(bool)
 432   { this->strip_ = STRIP_DEBUG; }
 433
 434   void
 435   set_strip_debug_gdb(bool)
 436   { this->strip_ = STRIP_DEBUG_UNUSED_BY_GDB; }
 437
 438   void
 439   set_allow_shlib_undefined(bool value)
 440   { this->allow_shlib_undefined_ = value; }
 441
 442   void
 443   set_no_allow_shlib_undefined(bool value)
 444   { this->set_allow_shlib_undefined(!value); }
 445
 446   void
 447   set_Bsymbolic(bool value)
 448   { this->symbolic_ = value; }
 449
 450   void set_compress_debug_sections(const char* arg)
 451   {
 452     if (strcmp(arg, "none") == 0)
 453       this->compress_debug_sections_ = NO_COMPRESSION;
 454 #ifdef HAVE_ZLIB_H
 455     else if (strcmp(arg, "zlib") == 0)
 456       this->compress_debug_sections_ = ZLIB_COMPRESSION;
 457 #endif
 458     else
 459       gold_fatal(_("unsupported argument to --compress-debug-sections: %s"),
 460                  arg);
 461   }
 462
 463   void
 464   add_to_defsym(const char* arg);
 465
 466   void
 467   set_demangle(bool value)
 468   { this->demangle_ = value; }
 469
 470   void
 471   set_no_demangle(bool value)
 472   { this->set_demangle(!value); }
 473
 474   void
 475   set_detect_odr_violations(bool value)
 476   { this->detect_odr_violations_ = value; }
 477
 478   void
 479   set_eh_frame_hdr(bool value)
 480   { this->create_eh_frame_hdr_ = value; }
 481
 482   void
 483   add_to_rpath(const char* arg)
 484   { this->rpath_.push_back(Search_directory(arg, false)); }
 485
 486   void
 487   add_to_rpath_link(const char* arg)
 488   { this->rpath_link_.push_back(Search_directory(arg, false)); }
 489
 490   void
 491   set_shared(bool value)
 492   { this->is_shared_ = value; }
 493
 494   void
 495   set_static(bool value)
 496   { this->is_static_ = value; }
 497
 498   void
 499   set_stats(bool value)
 500   { this->print_stats_ = value; }
 501
 502   void
 503   set_sysroot(const char* arg)
 504   { this->sysroot_ = arg; }
 505
 506   void
 507   set_segment_address(const char* name, const char* arg, uint64_t* val)
 508   {
 509     char* endptr;
 510     *val = strtoull(arg, &endptr, 0);
 511     if (*endptr != '\0' || *val == -1U)
 512       gold_fatal(_("invalid argument to %s: %s"), name, arg);
 513   }
 514
 515   void
 516   set_Tbss(const char* arg)
 517   { this->set_segment_address("-Tbss", arg, &this->bss_segment_address_); }
 518
 519   void
 520   set_Tdata(const char* arg)
 521   { this->set_segment_address("-Tdata", arg, &this->data_segment_address_); }
 522
 523   void
 524   set_Ttext(const char* arg)
 525   { this->set_segment_address("-Ttext", arg, &this->text_segment_address_); }
 526
 527   int
 528   parse_thread_count(const char* arg)
 529   {
 530     char* endptr;
 531     const int count = strtol(arg, &endptr, 0);
 532     if (*endptr != '\0' || count < 0)
 533       gold_fatal(_("invalid thread count: %s"), arg);
 534     return count;
 535   }
 536
 537   void
 538   set_threads(bool value)
 539   {
 540 #ifndef ENABLE_THREADS
 541     if (value)
 542       gold_fatal(_("--threads not supported"));
 543 #endif
 544     this->threads_ = value;
 545   }
 546
 547   void
 548   set_no_threads(bool value)
 549   { this->set_threads(!value); }
 550
 551   void
 552   set_thread_count(const char* arg)
 553   {
 554     int count = this->parse_thread_count(arg);
 555     this->thread_count_initial_ = count;
 556     this->thread_count_middle_ = count;
 557     this->thread_count_final_ = count;
 558   }
 559
 560   void
 561   set_thread_count_initial(const char* arg)
 562   { this->thread_count_initial_ = this->parse_thread_count(arg); }
 563
 564   void
 565   set_thread_count_middle(const char* arg)
 566   { this->thread_count_middle_ = this->parse_thread_count(arg); }
 567
 568   void
 569   set_thread_count_final(const char* arg)
 570   { this->thread_count_final_ = this->parse_thread_count(arg); }
 571
 572   void
 573   ignore(const char*)
 574   { }
 575
 576   void
 577   set_execstack(bool)
 578   { this->execstack_ = EXECSTACK_YES; }
 579
 580   void
 581   set_noexecstack(bool)
 582   { this->execstack_ = EXECSTACK_NO; }
 583
 584   void
 585   set_max_page_size(const char* arg)
 586   {
 587     char* endptr;
 588     this->max_page_size_ = strtoull(arg, &endptr, 0);
 589     if (*endptr != '\0' || this->max_page_size_ == 0)
 590       gold_fatal(_("invalid max-page-size: %s"), arg);
 591   }
 592
 593   void
 594   set_common_page_size(const char* arg)
 595   {
 596     char* endptr;
 597     this->common_page_size_ = strtoull(arg, &endptr, 0);
 598     if (*endptr != '\0' || this->common_page_size_ == 0)
 599       gold_fatal(_("invalid common-page-size: %s"), arg);
 600   }
 601
 602   void
 603   set_debug(unsigned int flags)
 604   { this->debug_ = flags; }
 605
 606   // Handle the -z option.
 607   void
 608   handle_z_option(const char*);
 609
 610   // Handle the --debug option.
 611   void
 612   handle_debug_option(const char*);
 613
 614   // Apply any sysroot to the directory lists.
 615   void
 616   add_sysroot();
 617
 618   const char* entry_;
 619   bool export_dynamic_;
 620   const char* soname_;
 621   const char* dynamic_linker_;
 622   Dir_list search_path_;
 623   int optimization_level_;
 624   const char* output_file_name_;
 625   Object_format oformat_;
 626   const char* oformat_string_;
 627   bool emit_relocs_;
 628   bool is_relocatable_;
 629   Strip strip_;
 630   bool allow_shlib_undefined_;
 631   bool symbolic_;
 632   CompressionMethod compress_debug_sections_;
 633   bool demangle_;
 634   bool detect_odr_violations_;
 635   bool create_eh_frame_hdr_;
 636   Dir_list rpath_;
 637   Dir_list rpath_link_;
 638   bool is_shared_;
 639   bool is_static_;
 640   bool print_stats_;
 641   std::string sysroot_;
 642   uint64_t bss_segment_address_;
 643   uint64_t data_segment_address_;
 644   uint64_t text_segment_address_;
 645   bool threads_;
 646   int thread_count_initial_;
 647   int thread_count_middle_;
 648   int thread_count_final_;
 649   Execstack execstack_;
 650   uint64_t max_page_size_;
 651   uint64_t common_page_size_;
 652   unsigned int debug_;
 653 };
 654
 655 // The current state of the position dependent options.
 656
 657 class Position_dependent_options
 658 {
 659  public:
 660   typedef General_options::Object_format Object_format;
 661
 662   Position_dependent_options();
 663
 664   // -Bdynamic/-Bstatic: Whether we are searching for a static archive
 665   // -rather than a shared object.
 666   bool
 667   Bstatic() const
 668   { return this->do_static_search_; }
 669
 670   // --as-needed: Whether to add a DT_NEEDED argument only if the
 671   // dynamic object is used.
 672   bool
 673   as_needed() const
 674   { return this->as_needed_; }
 675
 676   // --whole-archive: Whether to include the entire contents of an
 677   // --archive.
 678   bool
 679   whole_archive() const
 680   { return this->include_whole_archive_; }
 681
 682   // --format: The format of the input file.
 683   Object_format
 684   format() const
 685   { return this->input_format_; }
 686
 687   void
 688   set_Bstatic(bool value)
 689   { this->do_static_search_ = value; }
 690
 691   void
 692   set_Bdynamic(bool value)
 693   { this->set_Bstatic(!value); }
 694
 695   void
 696   set_as_needed(bool value)
 697   { this->as_needed_ = value; }
 698
 699   void
 700   set_no_as_needed(bool value)
 701   { this->set_as_needed(!value); }
 702
 703   void
 704   set_whole_archive(bool value)
 705   { this->include_whole_archive_ = value; }
 706
 707   void
 708   set_no_whole_archive(bool value)
 709   { this->set_whole_archive(!value); }
 710
 711   void
 712   set_format(const char*);
 713
 714  private:
 715   bool do_static_search_;
 716   bool as_needed_;
 717   bool include_whole_archive_;
 718   Object_format input_format_;
 719 };
 720
 721 // A single file or library argument from the command line.
 722
 723 class Input_file_argument
 724 {
 725  public:
 726   // name: file name or library name
 727   // is_lib: true if name is a library name: that is, emits the leading
 728   //         "lib" and trailing ".so"/".a" from the name
 729   // extra_search_path: an extra directory to look for the file, prior
 730   //         to checking the normal library search path.  If this is "",
 731   //         then no extra directory is added.
 732   // just_symbols: whether this file only defines symbols.
 733   // options: The position dependent options at this point in the
 734   //         command line, such as --whole-archive.
 735   Input_file_argument()
 736     : name_(), is_lib_(false), extra_search_path_(""), just_symbols_(false),
 737       options_()
 738   { }
 739
 740   Input_file_argument(const char* name, bool is_lib,
 741                       const char* extra_search_path,
 742                       bool just_symbols,
 743                       const Position_dependent_options& options)
 744     : name_(name), is_lib_(is_lib), extra_search_path_(extra_search_path),
 745       just_symbols_(just_symbols), options_(options)
 746   { }
 747
 748   const char*
 749   name() const
 750   { return this->name_.c_str(); }
 751
 752   const Position_dependent_options&
 753   options() const
 754   { return this->options_; }
 755
 756   bool
 757   is_lib() const
 758   { return this->is_lib_; }
 759
 760   const char*
 761   extra_search_path() const
 762   {
 763     return (this->extra_search_path_.empty()
 764             ? NULL
 765             : this->extra_search_path_.c_str());
 766   }
 767
 768   // Return whether we should only read symbols from this file.
 769   bool
 770   just_symbols() const
 771   { return this->just_symbols_; }
 772
 773   // Return whether this file may require a search using the -L
 774   // options.
 775   bool
 776   may_need_search() const
 777   { return this->is_lib_ || !this->extra_search_path_.empty(); }
 778
 779  private:
 780   // We use std::string, not const char*, here for convenience when
 781   // using script files, so that we do not have to preserve the string
 782   // in that case.
 783   std::string name_;
 784   bool is_lib_;
 785   std::string extra_search_path_;
 786   bool just_symbols_;
 787   Position_dependent_options options_;
 788 };
 789
 790 // A file or library, or a group, from the command line.
 791
 792 class Input_argument
 793 {
 794  public:
 795   // Create a file or library argument.
 796   explicit Input_argument(Input_file_argument file)
 797     : is_file_(true), file_(file), group_(NULL)
 798   { }
 799
 800   // Create a group argument.
 801   explicit Input_argument(Input_file_group* group)
 802     : is_file_(false), group_(group)
 803   { }
 804
 805   // Return whether this is a file.
 806   bool
 807   is_file() const
 808   { return this->is_file_; }
 809
 810   // Return whether this is a group.
 811   bool
 812   is_group() const
 813   { return !this->is_file_; }
 814
 815   // Return the information about the file.
 816   const Input_file_argument&
 817   file() const
 818   {
 819     gold_assert(this->is_file_);
 820     return this->file_;
 821   }
 822
 823   // Return the information about the group.
 824   const Input_file_group*
 825   group() const
 826   {
 827     gold_assert(!this->is_file_);
 828     return this->group_;
 829   }
 830
 831   Input_file_group*
 832   group()
 833   {
 834     gold_assert(!this->is_file_);
 835     return this->group_;
 836   }
 837
 838  private:
 839   bool is_file_;
 840   Input_file_argument file_;
 841   Input_file_group* group_;
 842 };
 843
 844 // A group from the command line.  This is a set of arguments within
 845 // --start-group ... --end-group.
 846
 847 class Input_file_group
 848 {
 849  public:
 850   typedef std::vector<Input_argument> Files;
 851   typedef Files::const_iterator const_iterator;
 852
 853   Input_file_group()
 854     : files_()
 855   { }
 856
 857   // Add a file to the end of the group.
 858   void
 859   add_file(const Input_file_argument& arg)
 860   { this->files_.push_back(Input_argument(arg)); }
 861
 862   // Iterators to iterate over the group contents.
 863
 864   const_iterator
 865   begin() const
 866   { return this->files_.begin(); }
 867
 868   const_iterator
 869   end() const
 870   { return this->files_.end(); }
 871
 872  private:
 873   Files files_;
 874 };
 875
 876 // A list of files from the command line or a script.
 877
 878 class Input_arguments
 879 {
 880  public:
 881   typedef std::vector<Input_argument> Input_argument_list;
 882   typedef Input_argument_list::const_iterator const_iterator;
 883
 884   Input_arguments()
 885     : input_argument_list_(), in_group_(false)
 886   { }
 887
 888   // Add a file.
 889   void
 890   add_file(const Input_file_argument& arg);
 891
 892   // Start a group (the --start-group option).
 893   void
 894   start_group();
 895
 896   // End a group (the --end-group option).
 897   void
 898   end_group();
 899
 900   // Return whether we are currently in a group.
 901   bool
 902   in_group() const
 903   { return this->in_group_; }
 904
 905   // The number of entries in the list.
 906   int
 907   size() const
 908   { return this->input_argument_list_.size(); }
 909
 910   // Iterators to iterate over the list of input files.
 911
 912   const_iterator
 913   begin() const
 914   { return this->input_argument_list_.begin(); }
 915
 916   const_iterator
 917   end() const
 918   { return this->input_argument_list_.end(); }
 919
 920   // Return whether the list is empty.
 921   bool
 922   empty() const
 923   { return this->input_argument_list_.empty(); }
 924
 925  private:
 926   Input_argument_list input_argument_list_;
 927   bool in_group_;
 928 };
 929
 930 // All the information read from the command line.
 931
 932 class Command_line
 933 {
 934  public:
 935   typedef Input_arguments::const_iterator const_iterator;
 936
 937   Command_line();
 938
 939   // Process the command line options.  This will exit with an
 940   // appropriate error message if an unrecognized option is seen.
 941   void
 942   process(int argc, char** argv);
 943
 944   // Process one command-line option.  This takes the index of argv to
 945   // process, and returns the index for the next option.
 946   int
 947   process_one_option(int argc, char** argv, int i, bool* no_more_options);
 948
 949   // Handle a -l option.
 950   int
 951   process_l_option(int, char**, char*, bool);
 952
 953   // Handle a -R option when it means --rpath.
 954   void
 955   add_to_rpath(const char* arg)
 956   { this->options_.add_to_rpath(arg); }
 957
 958   // Add a file for which we just read the symbols.
 959   void
 960   add_just_symbols_file(const char* arg)
 961   {
 962     this->inputs_.add_file(Input_file_argument(arg, false, "", true,
 963                                                this->position_options_));
 964   }
 965
 966   // Handle a --start-group option.
 967   void
 968   start_group(const char* arg);
 969
 970   // Handle a --end-group option.
 971   void
 972   end_group(const char* arg);
 973
 974   // Get an option argument--a helper function for special processing.
 975   const char*
 976   get_special_argument(const char* longname, int argc, char** argv,
 977                        const char* arg, bool long_option,
 978                        int *pret);
 979
 980   // Get the general options.
 981   const General_options&
 982   options() const
 983   { return this->options_; }
 984
 985   // Get the position dependent options.
 986   const Position_dependent_options&
 987   position_dependent_options() const
 988   { return this->position_options_; }
 989
 990   // Get the linker-script options.
 991   Script_options&
 992   script_options()
 993   { return this->script_options_; }
 994
 995   // Get the version-script options: a convenience routine.
 996   const Version_script_info&
 997   version_script() const
 998   { return *this->script_options_.version_script_info(); }
 999
1000   // The number of input files.
1001   int
1002   number_of_input_files() const
1003   { return this->inputs_.size(); }
1004
1005   // Iterators to iterate over the list of input files.
1006
1007   const_iterator
1008   begin() const
1009   { return this->inputs_.begin(); }
1010
1011   const_iterator
1012   end() const
1013   { return this->inputs_.end(); }
1014
1015  private:
1016   Command_line(const Command_line&);
1017   Command_line& operator=(const Command_line&);
1018
1019   // Report usage error.
1020   void
1021   usage() ATTRIBUTE_NORETURN;
1022   void
1023   usage(const char* msg, const char* opt) ATTRIBUTE_NORETURN;
1024   void
1025   usage(const char* msg, char opt) ATTRIBUTE_NORETURN;
1026
1027   // Apply a command line option.
1028   void
1029   apply_option(const gold::options::One_option&, const char*);
1030
1031   // Add a file.
1032   void
1033   add_file(const char* name, bool is_lib);
1034
1035   // Examine the result of processing the command-line, and verify
1036   // the flags do not contradict each other or are otherwise illegal.
1037   void
1038   normalize_options();
1039
1040   General_options options_;
1041   Position_dependent_options position_options_;
1042   Script_options script_options_;
1043   Input_arguments inputs_;
1044 };
1045
1046 } // End namespace gold.
1047
1048 #endif // !defined(GOLD_OPTIONS_H)