gold/options.cc

   1 // options.c -- handle command line options for gold
   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 #include "gold.h"
  24
  25 #include <cstdlib>
  26 #include <vector>
  27 #include <iostream>
  28 #include <sys/stat.h>
  29 #include "filenames.h"
  30 #include "libiberty.h"
  31
  32 #include "debug.h"
  33 #include "script.h"
  34 #include "target-select.h"
  35 #include "options.h"
  36
  37 namespace gold
  38 {
  39
  40 General_options
  41 Position_dependent_options::default_options_;
  42
  43 namespace options
  44 {
  45
  46 // This global variable is set up as General_options is constructed.
  47 static std::vector<const One_option*> registered_options;
  48
  49 // These are set up at the same time -- the variables that accept one
  50 // dash, two, or require -z.  A single variable may be in more than
  51 // one of thes data structures.
  52 typedef Unordered_map<std::string, One_option*> Option_map;
  53 static Option_map* long_options = NULL;
  54 static One_option* short_options[128];
  55
  56 void
  57 One_option::register_option()
  58 {
  59   registered_options.push_back(this);
  60
  61   // We can't make long_options a static Option_map because we can't
  62   // guarantee that will be initialized before register_option() is
  63   // first called.
  64   if (long_options == NULL)
  65     long_options = new Option_map;
  66
  67   // TWO_DASHES means that two dashes are preferred, but one is ok too.
  68   if (!this->longname.empty())
  69     (*long_options)[this->longname] = this;
  70
  71   const int shortname_as_int = static_cast<int>(this->shortname);
  72   gold_assert(shortname_as_int >= 0 && shortname_as_int < 128);
  73   if (this->shortname != '\0')
  74     short_options[shortname_as_int] = this;
  75 }
  76
  77 void
  78 One_option::print() const
  79 {
  80   bool comma = false;
  81   printf("  ");
  82   int len = 2;
  83   if (this->shortname != '\0')
  84     {
  85       len += printf("-%c", this->shortname);
  86       if (this->helparg)
  87         {
  88           // -z takes long-names only.
  89           gold_assert(this->dashes != DASH_Z);
  90           len += printf(" %s", gettext(this->helparg));
  91         }
  92       comma = true;
  93     }
  94   if (!this->longname.empty()
  95       && !(this->longname[0] == this->shortname
  96            && this->longname[1] == '\0'))
  97     {
  98       if (comma)
  99         len += printf(", ");
 100       switch (this->dashes)
 101         {
 102         case options::ONE_DASH: case options::EXACTLY_ONE_DASH:
 103           len += printf("-");
 104           break;
 105         case options::TWO_DASHES: case options::EXACTLY_TWO_DASHES:
 106           len += printf("--");
 107           break;
 108         case options::DASH_Z:
 109           len += printf("-z ");
 110           break;
 111         default:
 112           gold_unreachable();
 113         }
 114       len += printf("%s", this->longname.c_str());
 115       if (this->helparg)
 116         {
 117           // For most options, we print "--frob FOO".  But for -z
 118           // we print "-z frob=FOO".
 119           len += printf("%c%s", this->dashes == options::DASH_Z ? '=' : ' ',
 120                         gettext(this->helparg));
 121         }
 122     }
 123
 124   if (len >= 30)
 125     {
 126       printf("\n");
 127       len = 0;
 128     }
 129   for (; len < 30; ++len)
 130     std::putchar(' ');
 131
 132   // TODO: if we're boolean, add " (default)" when appropriate.
 133   printf("%s\n", gettext(this->helpstring));
 134 }
 135
 136 void
 137 help()
 138 {
 139   printf(_("Usage: %s [options] file...\nOptions:\n"), gold::program_name);
 140
 141   std::vector<const One_option*>::const_iterator it;
 142   for (it = registered_options.begin(); it != registered_options.end(); ++it)
 143     (*it)->print();
 144 }
 145
 146 // For bool, arg will be NULL (boolean options take no argument);
 147 // we always just set to true.
 148 void
 149 parse_bool(const char*, const char*, bool* retval)
 150 {
 151   *retval = true;
 152 }
 153
 154 void
 155 parse_uint(const char* option_name, const char* arg, int* retval)
 156 {
 157   char* endptr;
 158   *retval = strtol(arg, &endptr, 0);
 159   if (*endptr != '\0' || retval < 0)
 160     gold_fatal(_("%s: invalid option value (expected an integer): %s"),
 161                option_name, arg);
 162 }
 163
 164 void
 165 parse_uint64(const char* option_name, const char* arg, uint64_t *retval)
 166 {
 167   char* endptr;
 168   *retval = strtoull(arg, &endptr, 0);
 169   if (*endptr != '\0')
 170     gold_fatal(_("%s: invalid option value (expected an integer): %s"),
 171                option_name, arg);
 172 }
 173
 174 void
 175 parse_double(const char* option_name, const char* arg, double* retval)
 176 {
 177   char* endptr;
 178   *retval = strtod(arg, &endptr);
 179   if (*endptr != '\0')
 180     gold_fatal(_("%s: invalid option value "
 181                  "(expected a floating point number): %s"),
 182                option_name, arg);
 183 }
 184
 185 void
 186 parse_string(const char* option_name, const char* arg, const char** retval)
 187 {
 188   if (*arg == '\0')
 189     gold_fatal(_("%s: must take a non-empty argument"), option_name);
 190   *retval = arg;
 191 }
 192
 193 void
 194 parse_dirlist(const char*, const char* arg, Dir_list* retval)
 195 {
 196   retval->push_back(Search_directory(arg, false));
 197 }
 198
 199 void
 200 parse_choices(const char* option_name, const char* arg, const char** retval,
 201               const char* choices[], int num_choices)
 202 {
 203   for (int i = 0; i < num_choices; i++)
 204     if (strcmp(choices[i], arg) == 0)
 205       {
 206         *retval = arg;
 207         return;
 208       }
 209
 210   // If we get here, the user did not enter a valid choice, so we die.
 211   std::string choices_list;
 212   for (int i = 0; i < num_choices; i++)
 213     {
 214       choices_list += choices[i];
 215       if (i != num_choices - 1)
 216         choices_list += ", ";
 217     }
 218   gold_fatal(_("%s: must take one of the following arguments: %s"),
 219              option_name, choices_list.c_str());
 220 }
 221
 222 } // End namespace options.
 223
 224 // Define the handler for "special" options (set via DEFINE_special).
 225
 226 void
 227 General_options::parse_help(const char*, const char*, Command_line*)
 228 {
 229   options::help();
 230   ::exit(EXIT_SUCCESS);
 231 }
 232
 233 void
 234 General_options::parse_version(const char* opt, const char*, Command_line*)
 235 {
 236   gold::print_version(opt[0] == '-' && opt[1] == 'v');
 237   ::exit(EXIT_SUCCESS);
 238 }
 239
 240 void
 241 General_options::parse_Bstatic(const char*, const char*, Command_line*)
 242 {
 243   this->set_Bdynamic(false);
 244 }
 245
 246 void
 247 General_options::parse_defsym(const char*, const char* arg,
 248                               Command_line* cmdline)
 249 {
 250   cmdline->script_options().define_symbol(arg);
 251 }
 252
 253 void
 254 General_options::parse_library(const char*, const char* arg,
 255                                Command_line* cmdline)
 256 {
 257   Input_file_argument file(arg, true, "", false, *this);
 258   cmdline->inputs().add_file(file);
 259 }
 260
 261 void
 262 General_options::parse_R(const char* option, const char* arg,
 263                          Command_line* cmdline)
 264 {
 265   struct stat s;
 266   if (::stat(arg, &s) != 0 || S_ISDIR(s.st_mode))
 267     this->add_to_rpath(arg);
 268   else
 269     this->parse_just_symbols(option, arg, cmdline);
 270 }
 271
 272 void
 273 General_options::parse_just_symbols(const char*, const char* arg,
 274                                     Command_line* cmdline)
 275 {
 276   Input_file_argument file(arg, false, "", true, *this);
 277   cmdline->inputs().add_file(file);
 278 }
 279
 280 void
 281 General_options::parse_static(const char*, const char*, Command_line*)
 282 {
 283   this->set_static(true);
 284 }
 285
 286 void
 287 General_options::parse_script(const char*, const char* arg,
 288                               Command_line* cmdline)
 289 {
 290   if (!read_commandline_script(arg, cmdline))
 291     gold::gold_fatal(_("unable to parse script file %s"), arg);
 292 }
 293
 294 void
 295 General_options::parse_version_script(const char*, const char* arg,
 296                                       Command_line* cmdline)
 297 {
 298   if (!read_version_script(arg, cmdline))
 299     gold::gold_fatal(_("unable to parse version script file %s"), arg);
 300 }
 301
 302 void
 303 General_options::parse_start_group(const char*, const char*,
 304                                    Command_line* cmdline)
 305 {
 306   cmdline->inputs().start_group();
 307 }
 308
 309 void
 310 General_options::parse_end_group(const char*, const char*,
 311                                  Command_line* cmdline)
 312 {
 313   cmdline->inputs().end_group();
 314 }
 315
 316 } // End namespace gold.
 317
 318 namespace
 319 {
 320
 321 void
 322 usage()
 323 {
 324   fprintf(stderr,
 325           _("%s: use the --help option for usage information\n"),
 326           gold::program_name);
 327   ::exit(EXIT_FAILURE);
 328 }
 329
 330 void
 331 usage(const char* msg, const char *opt)
 332 {
 333   fprintf(stderr,
 334           _("%s: %s: %s\n"),
 335           gold::program_name, opt, msg);
 336   usage();
 337 }
 338
 339 // Recognize input and output target names.  The GNU linker accepts
 340 // these with --format and --oformat.  This code is intended to be
 341 // minimally compatible.  In practice for an ELF target this would be
 342 // the same target as the input files; that name always start with
 343 // "elf".  Non-ELF targets would be "srec", "symbolsrec", "tekhex",
 344 // "binary", "ihex".
 345
 346 gold::General_options::Object_format
 347 string_to_object_format(const char* arg)
 348 {
 349   if (strncmp(arg, "elf", 3) == 0)
 350     return gold::General_options::OBJECT_FORMAT_ELF;
 351   else if (strcmp(arg, "binary") == 0)
 352     return gold::General_options::OBJECT_FORMAT_BINARY;
 353   else
 354     {
 355       gold::gold_error(_("format '%s' not supported; treating as elf "
 356                          "(supported formats: elf, binary)"),
 357                        arg);
 358       return gold::General_options::OBJECT_FORMAT_ELF;
 359     }
 360 }
 361
 362 // If the default sysroot is relocatable, try relocating it based on
 363 // the prefix FROM.
 364
 365 char*
 366 get_relative_sysroot(const char* from)
 367 {
 368   char* path = make_relative_prefix(gold::program_name, from,
 369                                     TARGET_SYSTEM_ROOT);
 370   if (path != NULL)
 371     {
 372       struct stat s;
 373       if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
 374         return path;
 375       free(path);
 376     }
 377
 378   return NULL;
 379 }
 380
 381 // Return the default sysroot.  This is set by the --with-sysroot
 382 // option to configure.  Note we do not free the return value of
 383 // get_relative_sysroot, which is a small memory leak, but is
 384 // necessary since we store this pointer directly in General_options.
 385
 386 const char*
 387 get_default_sysroot()
 388 {
 389   const char* sysroot = TARGET_SYSTEM_ROOT;
 390   if (*sysroot == '\0')
 391     return NULL;
 392
 393   if (TARGET_SYSTEM_ROOT_RELOCATABLE)
 394     {
 395       char* path = get_relative_sysroot(BINDIR);
 396       if (path == NULL)
 397         path = get_relative_sysroot(TOOLBINDIR);
 398       if (path != NULL)
 399         return path;
 400     }
 401
 402   return sysroot;
 403 }
 404
 405 // Parse a long option.  Such options have the form
 406 // <-|--><option>[=arg].  If "=arg" is not present but the option
 407 // takes an argument, the next word is taken to the be the argument.
 408 // If equals_only is set, then only the <option>=<arg> form is
 409 // accepted, not the <option><space><arg> form.  Returns a One_option
 410 // struct or NULL if argv[i] cannot be parsed as a long option.  In
 411 // the not-NULL case, *arg is set to the option's argument (NULL if
 412 // the option takes no argument), and *i is advanced past this option.
 413 // NOTE: it is safe for argv and arg to point to the same place.
 414 gold::options::One_option*
 415 parse_long_option(int argc, const char** argv, bool equals_only,
 416                   const char** arg, int* i)
 417 {
 418   const char* const this_argv = argv[*i];
 419
 420   const char* equals = strchr(this_argv, '=');
 421   const char* option_start = this_argv + strspn(this_argv, "-");
 422   std::string option(option_start,
 423                      equals ? equals - option_start : strlen(option_start));
 424
 425   gold::options::Option_map::iterator it
 426       = gold::options::long_options->find(option);
 427   if (it == gold::options::long_options->end())
 428     return NULL;
 429
 430   gold::options::One_option* retval = it->second;
 431
 432   // If the dash-count doesn't match, we fail.
 433   if (this_argv[0] != '-')  // no dashes at all: had better be "-z <longopt>"
 434     {
 435       if (retval->dashes != gold::options::DASH_Z)
 436         return NULL;
 437     }
 438   else if (this_argv[1] != '-')   // one dash
 439     {
 440       if (retval->dashes != gold::options::ONE_DASH
 441           && retval->dashes != gold::options::EXACTLY_ONE_DASH
 442           && retval->dashes != gold::options::TWO_DASHES)
 443         return NULL;
 444     }
 445   else                            // two dashes (or more!)
 446     {
 447       if (retval->dashes != gold::options::TWO_DASHES
 448           && retval->dashes != gold::options::EXACTLY_TWO_DASHES
 449           && retval->dashes != gold::options::ONE_DASH)
 450         return NULL;
 451     }
 452
 453   // Now that we know the option is good (or else bad in a way that
 454   // will cause us to die), increment i to point past this argv.
 455   ++(*i);
 456
 457   // Figure out the option's argument, if any.
 458   if (!retval->takes_argument())
 459     {
 460       if (equals)
 461         usage(_("unexpected argument"), this_argv);
 462       else
 463         *arg = NULL;
 464     }
 465   else
 466     {
 467       if (equals)
 468         *arg = equals + 1;
 469       else if (*i < argc && !equals_only)
 470         *arg = argv[(*i)++];
 471       else
 472         usage(_("missing argument"), this_argv);
 473     }
 474
 475   return retval;
 476 }
 477
 478 // Parse a short option.  Such options have the form -<option>[arg].
 479 // If "arg" is not present but the option takes an argument, the next
 480 // word is taken to the be the argument.  If the option does not take
 481 // an argument, it may be followed by another short option.  Returns a
 482 // One_option struct or NULL if argv[i] cannot be parsed as a short
 483 // option.  In the not-NULL case, *arg is set to the option's argument
 484 // (NULL if the option takes no argument), and *i is advanced past
 485 // this option.  This function keeps *i the same if we parsed a short
 486 // option that does not take an argument, that looks to be followed by
 487 // another short option in the same word.
 488 gold::options::One_option*
 489 parse_short_option(int argc, const char** argv, int pos_in_argv_i,
 490                    const char** arg, int* i)
 491 {
 492   const char* const this_argv = argv[*i];
 493
 494   if (this_argv[0] != '-')
 495     return NULL;
 496
 497   // We handle -z as a special case.
 498   static gold::options::One_option dash_z("", gold::options::DASH_Z,
 499                                           'z', "", "-z", "Z-OPTION", NULL);
 500   gold::options::One_option* retval = NULL;
 501   if (this_argv[pos_in_argv_i] == 'z')
 502     retval = &dash_z;
 503   else
 504     {
 505       const int char_as_int = static_cast<int>(this_argv[pos_in_argv_i]);
 506       if (char_as_int > 0 && char_as_int < 128)
 507         retval = gold::options::short_options[char_as_int];
 508     }
 509
 510   if (retval == NULL)
 511     return NULL;
 512
 513   // Figure out the option's argument, if any.
 514   if (!retval->takes_argument())
 515     {
 516       *arg = NULL;
 517       // We only advance past this argument if it's the only one in argv.
 518       if (this_argv[pos_in_argv_i + 1] == '\0')
 519         ++(*i);
 520     }
 521   else
 522     {
 523       // If we take an argument, we'll eat up this entire argv entry.
 524       ++(*i);
 525       if (this_argv[pos_in_argv_i + 1] != '\0')
 526         *arg = this_argv + pos_in_argv_i + 1;
 527       else if (*i < argc)
 528         *arg = argv[(*i)++];
 529       else
 530         usage(_("missing argument"), this_argv);
 531     }
 532
 533   // If we're a -z option, we need to parse our argument as a
 534   // long-option, e.g. "-z stacksize=8192".
 535   if (retval == &dash_z)
 536     {
 537       int dummy_i = 0;
 538       const char* dash_z_arg = *arg;
 539       retval = parse_long_option(1, arg, true, arg, &dummy_i);
 540       if (retval == NULL)
 541         usage(_("unknown -z option"), dash_z_arg);
 542     }
 543
 544   return retval;
 545 }
 546
 547 } // End anonymous namespace.
 548
 549 namespace gold
 550 {
 551
 552 General_options::General_options()
 553   : execstack_status_(General_options::EXECSTACK_FROM_INPUT), static_(false)
 554 {
 555 }
 556
 557 General_options::Object_format
 558 General_options::format_enum() const
 559 {
 560   return string_to_object_format(this->format());
 561 }
 562
 563 General_options::Object_format
 564 General_options::oformat_enum() const
 565 {
 566   return string_to_object_format(this->oformat());
 567 }
 568
 569 // Add the sysroot, if any, to the search paths.
 570
 571 void
 572 General_options::add_sysroot()
 573 {
 574   if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
 575     {
 576       this->set_sysroot(get_default_sysroot());
 577       if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
 578         return;
 579     }
 580
 581   char* canonical_sysroot = lrealpath(this->sysroot());
 582
 583   for (Dir_list::iterator p = this->library_path_.value.begin();
 584        p != this->library_path_.value.end();
 585        ++p)
 586     p->add_sysroot(this->sysroot(), canonical_sysroot);
 587
 588   free(canonical_sysroot);
 589 }
 590
 591 // Set up variables and other state that isn't set up automatically by
 592 // the parse routine, and ensure options don't contradict each other
 593 // and are otherwise kosher.
 594
 595 void
 596 General_options::finalize()
 597 {
 598   // Normalize the strip modifiers.  They have a total order:
 599   // strip_all > strip_debug > strip_debug_gdb.  If one is true, set
 600   // all beneath it to true as well.
 601   if (this->strip_all())
 602     this->set_strip_debug(true);
 603   if (this->strip_debug())
 604     this->set_strip_debug_gdb(true);
 605
 606   // If the user specifies both -s and -r, convert the -s to -S.
 607   // -r requires us to keep externally visible symbols!
 608   if (this->strip_all() && this->relocatable())
 609     {
 610       this->set_strip_all(false);
 611       gold_assert(this->strip_debug());
 612     }
 613
 614   // For us, -dc and -dp are synonyms for --define-common.
 615   if (this->dc())
 616     this->set_define_common(true);
 617   if (this->dp())
 618     this->set_define_common(true);
 619
 620   // We also set --define-common if we're not relocatable, as long as
 621   // the user didn't explicitly ask for something different.
 622   if (!this->user_set_define_common())
 623     this->set_define_common(!this->relocatable());
 624
 625   // execstack_status_ is a three-state variable; update it based on
 626   // -z [no]execstack.
 627   if (this->execstack())
 628     this->set_execstack_status(EXECSTACK_YES);
 629   else if (this->noexecstack())
 630     this->set_execstack_status(EXECSTACK_NO);
 631
 632   // If --thread_count is specified, it applies to
 633   // --thread-count-{initial,middle,final}, though it doesn't override
 634   // them.
 635   if (this->thread_count() > 0 && this->thread_count_initial() == 0)
 636     this->set_thread_count_initial(this->thread_count());
 637   if (this->thread_count() > 0 && this->thread_count_middle() == 0)
 638     this->set_thread_count_middle(this->thread_count());
 639   if (this->thread_count() > 0 && this->thread_count_final() == 0)
 640     this->set_thread_count_final(this->thread_count());
 641
 642   // Let's warn if you set the thread-count but we're going to ignore it.
 643 #ifndef ENABLE_THREADS
 644   if (this->threads())
 645     {
 646       gold_warning(_("ignoring --threads: "
 647                      "%s was compiled without thread support"),
 648                    program_name);
 649       this->set_threads(false);
 650     }
 651   if (this->thread_count() > 0 || this->thread_count_initial() > 0
 652       || this->thread_count_middle() > 0 || this->thread_count_final() > 0)
 653     gold_warning(_("ignoring --thread-count: "
 654                    "%s was compiled without thread support"),
 655                  program_name);
 656 #endif
 657
 658   // Even if they don't specify it, we add -L /lib and -L /usr/lib.
 659   // FIXME: We should only do this when configured in native mode.
 660   this->add_to_library_path_with_sysroot("/lib");
 661   this->add_to_library_path_with_sysroot("/usr/lib");
 662
 663   // Normalize library_path() by adding the sysroot to all directories
 664   // in the path, as appropriate.
 665   this->add_sysroot();
 666
 667   // Now that we've normalized the options, check for contradictory ones.
 668   if (this->shared() && this->relocatable())
 669     gold_fatal(_("-shared and -r are incompatible"));
 670
 671   if (this->oformat_enum() != General_options::OBJECT_FORMAT_ELF
 672       && (this->shared() || this->relocatable()))
 673     gold_fatal(_("binary output format not compatible with -shared or -r"));
 674
 675   if (this->user_set_hash_bucket_empty_fraction()
 676       && (this->hash_bucket_empty_fraction() < 0.0
 677           || this->hash_bucket_empty_fraction() >= 1.0))
 678     gold_fatal(_("--hash-bucket-empty-fraction value %g out of range "
 679                  "[0.0, 1.0)"),
 680                this->hash_bucket_empty_fraction());
 681
 682   // FIXME: we can/should be doing a lot more sanity checking here.
 683 }
 684
 685 // Search_directory methods.
 686
 687 // This is called if we have a sysroot.  Apply the sysroot if
 688 // appropriate.  Record whether the directory is in the sysroot.
 689
 690 void
 691 Search_directory::add_sysroot(const char* sysroot,
 692                               const char* canonical_sysroot)
 693 {
 694   gold_assert(*sysroot != '\0');
 695   if (this->put_in_sysroot_)
 696     {
 697       if (!IS_DIR_SEPARATOR(this->name_[0])
 698           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
 699         this->name_ = '/' + this->name_;
 700       this->name_ = sysroot + this->name_;
 701       this->is_in_sysroot_ = true;
 702     }
 703   else
 704     {
 705       // Check whether this entry is in the sysroot.  To do this
 706       // correctly, we need to use canonical names.  Otherwise we will
 707       // get confused by the ../../.. paths that gcc tends to use.
 708       char* canonical_name = lrealpath(this->name_.c_str());
 709       int canonical_name_len = strlen(canonical_name);
 710       int canonical_sysroot_len = strlen(canonical_sysroot);
 711       if (canonical_name_len > canonical_sysroot_len
 712           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
 713         {
 714           canonical_name[canonical_sysroot_len] = '\0';
 715           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
 716             this->is_in_sysroot_ = true;
 717         }
 718       free(canonical_name);
 719     }
 720 }
 721
 722 // Input_arguments methods.
 723
 724 // Add a file to the list.
 725
 726 void
 727 Input_arguments::add_file(const Input_file_argument& file)
 728 {
 729   if (!this->in_group_)
 730     this->input_argument_list_.push_back(Input_argument(file));
 731   else
 732     {
 733       gold_assert(!this->input_argument_list_.empty());
 734       gold_assert(this->input_argument_list_.back().is_group());
 735       this->input_argument_list_.back().group()->add_file(file);
 736     }
 737 }
 738
 739 // Start a group.
 740
 741 void
 742 Input_arguments::start_group()
 743 {
 744   if (this->in_group_)
 745     gold_fatal(_("May not nest groups"));
 746   Input_file_group* group = new Input_file_group();
 747   this->input_argument_list_.push_back(Input_argument(group));
 748   this->in_group_ = true;
 749 }
 750
 751 // End a group.
 752
 753 void
 754 Input_arguments::end_group()
 755 {
 756   if (!this->in_group_)
 757     gold_fatal(_("Group end without group start"));
 758   this->in_group_ = false;
 759 }
 760
 761 // Command_line options.
 762
 763 Command_line::Command_line()
 764 {
 765 }
 766
 767 // Process the command line options.  For process_one_option, i is the
 768 // index of argv to process next, and must be an option (that is,
 769 // start with a dash).  The return value is the index of the next
 770 // option to process (i+1 or i+2, or argc to indicate processing is
 771 // done).  no_more_options is set to true if (and when) "--" is seen
 772 // as an option.
 773
 774 int
 775 Command_line::process_one_option(int argc, const char** argv, int i,
 776                                  bool* no_more_options)
 777 {
 778   gold_assert(argv[i][0] == '-' && !(*no_more_options));
 779
 780   // If we are reading "--", then just set no_more_options and return.
 781   if (argv[i][1] == '-' && argv[i][2] == '\0')
 782     {
 783       *no_more_options = true;
 784       return i + 1;
 785     }
 786
 787   int new_i = i;
 788   options::One_option* option = NULL;
 789   const char* arg = NULL;
 790
 791   // First, try to process argv as a long option.
 792   option = parse_long_option(argc, argv, false, &arg, &new_i);
 793   if (option)
 794     {
 795       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
 796       return new_i;
 797     }
 798
 799   // Now, try to process argv as a short option.  Since several short
 800   // options can be combined in one argv, we may have to parse a lot
 801   // until we're done reading this argv.
 802   int pos_in_argv_i = 1;
 803   while (new_i == i)
 804     {
 805       option = parse_short_option(argc, argv, pos_in_argv_i, &arg, &new_i);
 806       if (!option)
 807         break;
 808       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
 809       ++pos_in_argv_i;
 810     }
 811   if (option)
 812     return new_i;
 813
 814   // I guess it's neither a long option nor a short option.
 815   usage(_("unknown option"), argv[i]);
 816   return argc;
 817 }
 818
 819
 820 void
 821 Command_line::process(int argc, const char** argv)
 822 {
 823   bool no_more_options = false;
 824   int i = 0;
 825   while (i < argc)
 826     {
 827       this->position_options_.copy_from_options(this->options());
 828       if (no_more_options || argv[i][0] != '-')
 829         {
 830           Input_file_argument file(argv[i], false, "", false,
 831                                    this->position_options_);
 832           this->inputs_.add_file(file);
 833           ++i;
 834         }
 835       else
 836         i = process_one_option(argc, argv, i, &no_more_options);
 837     }
 838
 839   if (this->inputs_.in_group())
 840     {
 841       fprintf(stderr, _("%s: missing group end\n"), program_name);
 842       usage();
 843     }
 844
 845   // Normalize the options and ensure they don't contradict each other.
 846   this->options_.finalize();
 847 }
 848
 849 } // End namespace gold.