gdb/main.c

   1 /* Top level stuff for GDB, the GNU debugger.
   2    Copyright 1986-1995, 1999-2000 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22 #include "top.h"
  23 #include "target.h"
  24 #include "inferior.h"
  25 #include "call-cmds.h"
  26
  27 #include "getopt.h"
  28
  29 #include <sys/types.h>
  30 #include "gdb_stat.h"
  31 #include <ctype.h>
  32
  33 #include "gdb_string.h"
  34 #include "event-loop.h"
  35 #include "ui-out.h"
  36 #if defined (TUI) || defined (GDBTK)
  37 /* FIXME: cagney/2000-01-31: This #include is to allow older code such
  38    as that found in the TUI to continue to build. */
  39 #include "tui/tui-file.h"
  40 #endif
  41
  42 /* If nonzero, display time usage both at startup and for each command.  */
  43
  44 int display_time;
  45
  46 /* If nonzero, display space usage both at startup and for each command.  */
  47
  48 int display_space;
  49
  50 /* Whether this is the async version or not.  The async version is
  51    invoked on the command line with the -nw --async options.  In this
  52    version, the usual command_loop is substituted by and event loop which
  53    processes UI events asynchronously. */
  54 int event_loop_p = 1;
  55
  56 /* Whether this is the command line version or not */
  57 int tui_version = 0;
  58
  59 /* Whether xdb commands will be handled */
  60 int xdb_commands = 0;
  61
  62 /* Whether dbx commands will be handled */
  63 int dbx_commands = 0;
  64
  65 struct ui_file *gdb_stdout;
  66 struct ui_file *gdb_stderr;
  67 struct ui_file *gdb_stdlog;
  68 struct ui_file *gdb_stdtarg;
  69
  70 /* Used to initialize error() - defined in utils.c */
  71
  72 extern void error_init (void);
  73
  74 /* Whether to enable writing into executable and core files */
  75 extern int write_files;
  76
  77 static void print_gdb_help (struct ui_file *);
  78
  79 /* These two are used to set the external editor commands when gdb is farming
  80    out files to be edited by another program. */
  81
  82 extern int enable_external_editor;
  83 extern char *external_editor_command;
  84
  85 #ifdef __CYGWIN__
  86 #include <windows.h>            /* for MAX_PATH */
  87 #include <sys/cygwin.h>         /* for cygwin32_conv_to_posix_path */
  88 #endif
  89
  90 /* Call command_loop.  If it happens to return, pass that through as a
  91    non-zero return status. */
  92
  93 static int
  94 captured_command_loop (void *data)
  95 {
  96   if (command_loop_hook == NULL)
  97     command_loop ();
  98   else
  99     command_loop_hook ();
 100   /* FIXME: cagney/1999-11-05: A correct command_loop() implementaton
 101      would clean things up (restoring the cleanup chain) to the state
 102      they were just prior to the call.  Technically, this means that
 103      the do_cleanups() below is redundant.  Unfortunatly, many FUNC's
 104      are not that well behaved.  do_cleanups should either be replaced
 105      with a do_cleanups call (to cover the problem) or an assertion
 106      check to detect bad FUNCs code. */
 107   do_cleanups (ALL_CLEANUPS);
 108   /* If the command_loop returned, normally (rather than threw an
 109      error) we try to quit. If the quit is aborted, catch_errors()
 110      which called this catch the signal and restart the command
 111      loop. */
 112   quit_command (NULL, instream == stdin);
 113   return 1;
 114 }
 115
 116 struct captured_main_args
 117   {
 118     int argc;
 119     char **argv;
 120   };
 121
 122 static int
 123 captured_main (void *data)
 124 {
 125   struct captured_main_args *context = data;
 126   int argc = context->argc;
 127   char **argv = context->argv;
 128   int count;
 129   static int quiet = 0;
 130   static int batch = 0;
 131
 132   /* Pointers to various arguments from command line.  */
 133   char *symarg = NULL;
 134   char *execarg = NULL;
 135   char *corearg = NULL;
 136   char *cdarg = NULL;
 137   char *ttyarg = NULL;
 138
 139   /* These are static so that we can take their address in an initializer.  */
 140   static int print_help;
 141   static int print_version;
 142
 143   /* Pointers to all arguments of --command option.  */
 144   char **cmdarg;
 145   /* Allocated size of cmdarg.  */
 146   int cmdsize;
 147   /* Number of elements of cmdarg used.  */
 148   int ncmd;
 149
 150   /* Indices of all arguments of --directory option.  */
 151   char **dirarg;
 152   /* Allocated size.  */
 153   int dirsize;
 154   /* Number of elements used.  */
 155   int ndir;
 156
 157   struct stat homebuf, cwdbuf;
 158   char *homedir, *homeinit;
 159
 160   register int i;
 161
 162   long time_at_startup = get_run_time ();
 163
 164   START_PROGRESS (argv[0], 0);
 165
 166 #ifdef MPW
 167   /* Do all Mac-specific setup. */
 168   mac_init ();
 169 #endif /* MPW */
 170
 171   /* This needs to happen before the first use of malloc.  */
 172   init_malloc ((PTR) NULL);
 173
 174 #if defined (ALIGN_STACK_ON_STARTUP)
 175   i = (int) &count & 0x3;
 176   if (i != 0)
 177     alloca (4 - i);
 178 #endif
 179
 180   cmdsize = 1;
 181   cmdarg = (char **) xmalloc (cmdsize * sizeof (*cmdarg));
 182   ncmd = 0;
 183   dirsize = 1;
 184   dirarg = (char **) xmalloc (dirsize * sizeof (*dirarg));
 185   ndir = 0;
 186
 187   quit_flag = 0;
 188   line = (char *) xmalloc (linesize);
 189   line[0] = '\0';               /* Terminate saved (now empty) cmd line */
 190   instream = stdin;
 191
 192   getcwd (gdb_dirbuf, sizeof (gdb_dirbuf));
 193   current_directory = gdb_dirbuf;
 194
 195 #if defined (TUI) || defined (GDBTK)
 196   /* Older code uses the tui_file and fputs_unfiltered_hook().  It
 197      should be using a customized UI_FILE object and re-initializing
 198      within its own _initialize function.  */
 199   gdb_stdout = tui_fileopen (stdout);
 200   gdb_stderr = tui_fileopen (stderr);
 201   gdb_stdlog = gdb_stdout;      /* for moment */
 202   gdb_stdtarg = gdb_stderr;     /* for moment */
 203 #else
 204   gdb_stdout = stdio_fileopen (stdout);
 205   gdb_stderr = stdio_fileopen (stderr);
 206   gdb_stdlog = gdb_stderr;      /* for moment */
 207   gdb_stdtarg = gdb_stderr;     /* for moment */
 208 #endif
 209
 210   /* initialize error() */
 211   error_init ();
 212
 213   /* Parse arguments and options.  */
 214   {
 215     int c;
 216     /* When var field is 0, use flag field to record the equivalent
 217        short option (or arbitrary numbers starting at 10 for those
 218        with no equivalent).  */
 219     static struct option long_options[] =
 220     {
 221       {"async", no_argument, &event_loop_p, 1},
 222       {"noasync", no_argument, &event_loop_p, 0},
 223 #if defined(TUI)
 224       {"tui", no_argument, &tui_version, 1},
 225 #endif
 226       {"xdb", no_argument, &xdb_commands, 1},
 227       {"dbx", no_argument, &dbx_commands, 1},
 228       {"readnow", no_argument, &readnow_symbol_files, 1},
 229       {"r", no_argument, &readnow_symbol_files, 1},
 230       {"mapped", no_argument, &mapped_symbol_files, 1},
 231       {"m", no_argument, &mapped_symbol_files, 1},
 232       {"quiet", no_argument, &quiet, 1},
 233       {"q", no_argument, &quiet, 1},
 234       {"silent", no_argument, &quiet, 1},
 235       {"nx", no_argument, &inhibit_gdbinit, 1},
 236       {"n", no_argument, &inhibit_gdbinit, 1},
 237       {"batch", no_argument, &batch, 1},
 238       {"epoch", no_argument, &epoch_interface, 1},
 239
 240     /* This is a synonym for "--annotate=1".  --annotate is now preferred,
 241        but keep this here for a long time because people will be running
 242        emacses which use --fullname.  */
 243       {"fullname", no_argument, 0, 'f'},
 244       {"f", no_argument, 0, 'f'},
 245
 246       {"annotate", required_argument, 0, 12},
 247       {"help", no_argument, &print_help, 1},
 248       {"se", required_argument, 0, 10},
 249       {"symbols", required_argument, 0, 's'},
 250       {"s", required_argument, 0, 's'},
 251       {"exec", required_argument, 0, 'e'},
 252       {"e", required_argument, 0, 'e'},
 253       {"core", required_argument, 0, 'c'},
 254       {"c", required_argument, 0, 'c'},
 255       {"command", required_argument, 0, 'x'},
 256       {"version", no_argument, &print_version, 1},
 257       {"x", required_argument, 0, 'x'},
 258 #ifdef GDBTK
 259       {"tclcommand", required_argument, 0, 'z'},
 260       {"enable-external-editor", no_argument, 0, 'y'},
 261       {"editor-command", required_argument, 0, 'w'},
 262 #endif
 263       {"ui", required_argument, 0, 'i'},
 264       {"interpreter", required_argument, 0, 'i'},
 265       {"i", required_argument, 0, 'i'},
 266       {"directory", required_argument, 0, 'd'},
 267       {"d", required_argument, 0, 'd'},
 268       {"cd", required_argument, 0, 11},
 269       {"tty", required_argument, 0, 't'},
 270       {"baud", required_argument, 0, 'b'},
 271       {"b", required_argument, 0, 'b'},
 272       {"nw", no_argument, &use_windows, 0},
 273       {"nowindows", no_argument, &use_windows, 0},
 274       {"w", no_argument, &use_windows, 1},
 275       {"windows", no_argument, &use_windows, 1},
 276       {"statistics", no_argument, 0, 13},
 277       {"write", no_argument, &write_files, 1},
 278 /* Allow machine descriptions to add more options... */
 279 #ifdef ADDITIONAL_OPTIONS
 280       ADDITIONAL_OPTIONS
 281 #endif
 282       {0, no_argument, 0, 0}
 283     };
 284
 285     while (1)
 286       {
 287         int option_index;
 288
 289         c = getopt_long_only (argc, argv, "",
 290                               long_options, &option_index);
 291         if (c == EOF)
 292           break;
 293
 294         /* Long option that takes an argument.  */
 295         if (c == 0 && long_options[option_index].flag == 0)
 296           c = long_options[option_index].val;
 297
 298         switch (c)
 299           {
 300           case 0:
 301             /* Long option that just sets a flag.  */
 302             break;
 303           case 10:
 304             symarg = optarg;
 305             execarg = optarg;
 306             break;
 307           case 11:
 308             cdarg = optarg;
 309             break;
 310           case 12:
 311             /* FIXME: what if the syntax is wrong (e.g. not digits)?  */
 312             annotation_level = atoi (optarg);
 313             break;
 314           case 13:
 315             /* Enable the display of both time and space usage.  */
 316             display_time = 1;
 317             display_space = 1;
 318             break;
 319           case 'f':
 320             annotation_level = 1;
 321 /* We have probably been invoked from emacs.  Disable window interface.  */
 322             use_windows = 0;
 323             break;
 324           case 's':
 325             symarg = optarg;
 326             break;
 327           case 'e':
 328             execarg = optarg;
 329             break;
 330           case 'c':
 331             corearg = optarg;
 332             break;
 333           case 'x':
 334             cmdarg[ncmd++] = optarg;
 335             if (ncmd >= cmdsize)
 336               {
 337                 cmdsize *= 2;
 338                 cmdarg = (char **) xrealloc ((char *) cmdarg,
 339                                              cmdsize * sizeof (*cmdarg));
 340               }
 341             break;
 342 #ifdef GDBTK
 343           case 'z':
 344             {
 345               extern int gdbtk_test PARAMS ((char *));
 346               if (!gdbtk_test (optarg))
 347                 {
 348                   fprintf_unfiltered (gdb_stderr, "%s: unable to load tclcommand file \"%s\"",
 349                                       argv[0], optarg);
 350                   exit (1);
 351                 }
 352               break;
 353             }
 354           case 'y':
 355             {
 356               /*
 357                * This enables the edit/button in the main window, even
 358                * when IDE_ENABLED is set to false. In this case you must
 359                * use --tclcommand to specify a tcl/script to be called,
 360                * Tcl/Variable to store the edit/command is:
 361                * external_editor
 362                */
 363               enable_external_editor = 1;
 364               break;
 365             }
 366           case 'w':
 367             {
 368               /*
 369                * if editor command is enabled, both flags are set
 370                */
 371               enable_external_editor = 1;
 372               external_editor_command = xstrdup (optarg);
 373               break;
 374             }
 375 #endif /* GDBTK */
 376           case 'd':
 377             dirarg[ndir++] = optarg;
 378             if (ndir >= dirsize)
 379               {
 380                 dirsize *= 2;
 381                 dirarg = (char **) xrealloc ((char *) dirarg,
 382                                              dirsize * sizeof (*dirarg));
 383               }
 384             break;
 385           case 't':
 386             ttyarg = optarg;
 387             break;
 388           case 'q':
 389             quiet = 1;
 390             break;
 391           case 'b':
 392             {
 393               int i;
 394               char *p;
 395
 396               i = strtol (optarg, &p, 0);
 397               if (i == 0 && p == optarg)
 398
 399                 /* Don't use *_filtered or warning() (which relies on
 400                    current_target) until after initialize_all_files(). */
 401
 402                 fprintf_unfiltered
 403                   (gdb_stderr,
 404                    "warning: could not set baud rate to `%s'.\n", optarg);
 405               else
 406                 baud_rate = i;
 407             }
 408           case 'l':
 409             {
 410               int i;
 411               char *p;
 412
 413               i = strtol (optarg, &p, 0);
 414               if (i == 0 && p == optarg)
 415
 416                 /* Don't use *_filtered or warning() (which relies on
 417                    current_target) until after initialize_all_files(). */
 418
 419                 fprintf_unfiltered
 420                   (gdb_stderr,
 421                  "warning: could not set timeout limit to `%s'.\n", optarg);
 422               else
 423                 remote_timeout = i;
 424             }
 425             break;
 426
 427 #ifdef ADDITIONAL_OPTION_CASES
 428             ADDITIONAL_OPTION_CASES
 429 #endif
 430           case '?':
 431             fprintf_unfiltered (gdb_stderr,
 432                         "Use `%s --help' for a complete list of options.\n",
 433                                 argv[0]);
 434             exit (1);
 435           }
 436       }
 437
 438     /* If --help or --version, disable window interface.  */
 439     if (print_help || print_version)
 440       {
 441         use_windows = 0;
 442 #ifdef TUI
 443         /* Disable the TUI as well.  */
 444         tui_version = 0;
 445 #endif
 446       }
 447
 448 #ifdef TUI
 449     /* An explicit --tui flag overrides the default UI, which is the
 450        window system.  */
 451     if (tui_version)
 452       use_windows = 0;
 453 #endif
 454
 455     /* OK, that's all the options.  The other arguments are filenames.  */
 456     count = 0;
 457     for (; optind < argc; optind++)
 458       switch (++count)
 459         {
 460         case 1:
 461           symarg = argv[optind];
 462           execarg = argv[optind];
 463           break;
 464         case 2:
 465           corearg = argv[optind];
 466           break;
 467         case 3:
 468           fprintf_unfiltered (gdb_stderr,
 469                           "Excess command line arguments ignored. (%s%s)\n",
 470                           argv[optind], (optind == argc - 1) ? "" : " ...");
 471           break;
 472         }
 473     if (batch)
 474       quiet = 1;
 475   }
 476
 477 #if defined(TUI)
 478   /* Should this be moved to tui-top.c:_initialize_tui()? */
 479   if (tui_version)
 480     init_ui_hook = tuiInit;
 481 #endif
 482
 483   /* Initialize all files.  Give the interpreter a chance to take
 484      control of the console via the init_ui_hook()) */
 485   gdb_init (argv[0]);
 486
 487   /* Do these (and anything which might call wrap_here or *_filtered)
 488      after initialize_all_files.  */
 489   if (print_version)
 490     {
 491       print_gdb_version (gdb_stdout);
 492       wrap_here ("");
 493       printf_filtered ("\n");
 494       exit (0);
 495     }
 496
 497   if (print_help)
 498     {
 499       print_gdb_help (gdb_stdout);
 500       fputs_unfiltered ("\n", gdb_stdout);
 501       exit (0);
 502     }
 503
 504   if (!quiet)
 505     {
 506       /* Print all the junk at the top, with trailing "..." if we are about
 507          to read a symbol file (possibly slowly).  */
 508       print_gdb_version (gdb_stdout);
 509       if (symarg)
 510         printf_filtered ("..");
 511       wrap_here ("");
 512       gdb_flush (gdb_stdout);   /* Force to screen during slow operations */
 513     }
 514
 515   error_pre_print = "\n\n";
 516   quit_pre_print = error_pre_print;
 517
 518   /* We may get more than one warning, don't double space all of them... */
 519   warning_pre_print = "\nwarning: ";
 520
 521   /* Read and execute $HOME/.gdbinit file, if it exists.  This is done
 522      *before* all the command line arguments are processed; it sets
 523      global parameters, which are independent of what file you are
 524      debugging or what directory you are in.  */
 525 #ifdef __CYGWIN32__
 526   {
 527     char *tmp = getenv ("HOME");
 528
 529     if (tmp != NULL)
 530       {
 531         homedir = (char *) alloca (MAX_PATH + 1);
 532         cygwin32_conv_to_posix_path (tmp, homedir);
 533       }
 534     else
 535       homedir = NULL;
 536   }
 537 #else
 538   homedir = getenv ("HOME");
 539 #endif
 540   if (homedir)
 541     {
 542       homeinit = (char *) alloca (strlen (homedir) +
 543                                   strlen (gdbinit) + 10);
 544       strcpy (homeinit, homedir);
 545       strcat (homeinit, "/");
 546       strcat (homeinit, gdbinit);
 547
 548       if (!inhibit_gdbinit)
 549         {
 550           catch_command_errors (source_command, homeinit, 0, RETURN_MASK_ALL);
 551         }
 552
 553       /* Do stats; no need to do them elsewhere since we'll only
 554          need them if homedir is set.  Make sure that they are
 555          zero in case one of them fails (this guarantees that they
 556          won't match if either exists).  */
 557
 558       memset (&homebuf, 0, sizeof (struct stat));
 559       memset (&cwdbuf, 0, sizeof (struct stat));
 560
 561       stat (homeinit, &homebuf);
 562       stat (gdbinit, &cwdbuf);  /* We'll only need this if
 563                                    homedir was set.  */
 564     }
 565
 566   /* Now perform all the actions indicated by the arguments.  */
 567   if (cdarg != NULL)
 568     {
 569       catch_command_errors (cd_command, cdarg, 0, RETURN_MASK_ALL);
 570     }
 571
 572   for (i = 0; i < ndir; i++)
 573     catch_command_errors (directory_command, dirarg[i], 0, RETURN_MASK_ALL);
 574   free ((PTR) dirarg);
 575
 576   if (execarg != NULL
 577       && symarg != NULL
 578       && STREQ (execarg, symarg))
 579     {
 580       /* The exec file and the symbol-file are the same.  If we can't
 581          open it, better only print one error message.
 582          catch_command_errors returns non-zero on success! */
 583       if (catch_command_errors (exec_file_command, execarg, !batch, RETURN_MASK_ALL))
 584         catch_command_errors (symbol_file_command, symarg, 0, RETURN_MASK_ALL);
 585     }
 586   else
 587     {
 588       if (execarg != NULL)
 589         catch_command_errors (exec_file_command, execarg, !batch, RETURN_MASK_ALL);
 590       if (symarg != NULL)
 591         catch_command_errors (symbol_file_command, symarg, 0, RETURN_MASK_ALL);
 592     }
 593
 594   /* After the symbol file has been read, print a newline to get us
 595      beyond the copyright line...  But errors should still set off
 596      the error message with a (single) blank line.  */
 597   if (!quiet)
 598     printf_filtered ("\n");
 599   error_pre_print = "\n";
 600   quit_pre_print = error_pre_print;
 601   warning_pre_print = "\nwarning: ";
 602
 603   if (corearg != NULL)
 604     {
 605       if (catch_command_errors (core_file_command, corearg, !batch, RETURN_MASK_ALL) == 0)
 606         {
 607           /* See if the core file is really a PID. */
 608           if (isdigit (corearg[0]))
 609             catch_command_errors (attach_command, corearg, !batch, RETURN_MASK_ALL);
 610         }
 611     }
 612
 613   if (ttyarg != NULL)
 614     catch_command_errors (tty_command, ttyarg, !batch, RETURN_MASK_ALL);
 615
 616 #ifdef ADDITIONAL_OPTION_HANDLER
 617   ADDITIONAL_OPTION_HANDLER;
 618 #endif
 619
 620   /* Error messages should no longer be distinguished with extra output. */
 621   error_pre_print = NULL;
 622   quit_pre_print = NULL;
 623   warning_pre_print = "warning: ";
 624
 625   /* Read the .gdbinit file in the current directory, *if* it isn't
 626      the same as the $HOME/.gdbinit file (it should exist, also).  */
 627
 628   if (!homedir
 629       || memcmp ((char *) &homebuf, (char *) &cwdbuf, sizeof (struct stat)))
 630     if (!inhibit_gdbinit)
 631       {
 632         catch_command_errors (source_command, gdbinit, 0, RETURN_MASK_ALL);
 633       }
 634
 635   for (i = 0; i < ncmd; i++)
 636     {
 637 #if 0
 638       /* NOTE: cagney/1999-11-03: SET_TOP_LEVEL() was a macro that
 639          expanded into a call to setjmp().  */
 640       if (!SET_TOP_LEVEL ()) /* NB: This is #if 0'd out */
 641         {
 642           /* NOTE: I am commenting this out, because it is not clear
 643              where this feature is used. It is very old and
 644              undocumented. ezannoni: 1999-05-04 */
 645 #if 0
 646           if (cmdarg[i][0] == '-' && cmdarg[i][1] == '\0')
 647             read_command_file (stdin);
 648           else
 649 #endif
 650             source_command (cmdarg[i], !batch);
 651           do_cleanups (ALL_CLEANUPS);
 652         }
 653 #endif
 654       catch_command_errors (source_command, cmdarg[i], !batch, RETURN_MASK_ALL);
 655     }
 656   free ((PTR) cmdarg);
 657
 658   /* Read in the old history after all the command files have been read. */
 659   init_history ();
 660
 661   if (batch)
 662     {
 663       /* We have hit the end of the batch file.  */
 664       exit (0);
 665     }
 666
 667   /* Do any host- or target-specific hacks.  This is used for i960 targets
 668      to force the user to set a nindy target and spec its parameters.  */
 669
 670 #ifdef BEFORE_MAIN_LOOP_HOOK
 671   BEFORE_MAIN_LOOP_HOOK;
 672 #endif
 673
 674   END_PROGRESS (argv[0]);
 675
 676   /* Show time and/or space usage.  */
 677
 678   if (display_time)
 679     {
 680       long init_time = get_run_time () - time_at_startup;
 681
 682       printf_unfiltered ("Startup time: %ld.%06ld\n",
 683                          init_time / 1000000, init_time % 1000000);
 684     }
 685
 686   if (display_space)
 687     {
 688 #ifdef HAVE_SBRK
 689       extern char **environ;
 690       char *lim = (char *) sbrk (0);
 691
 692       printf_unfiltered ("Startup size: data size %ld\n",
 693                          (long) (lim - (char *) &environ));
 694 #endif
 695     }
 696
 697   /* The default command loop.
 698      The WIN32 Gui calls this main to set up gdb's state, and
 699      has its own command loop. */
 700 #if !defined _WIN32 || defined __GNUC__
 701   /* GUIs generally have their own command loop, mainloop, or
 702      whatever.  This is a good place to gain control because many
 703      error conditions will end up here via longjmp(). */
 704 #if 0
 705   /* FIXME: cagney/1999-11-06: The original main loop was like: */
 706   while (1)
 707     {
 708       if (!SET_TOP_LEVEL ())
 709         {
 710           do_cleanups (ALL_CLEANUPS);   /* Do complete cleanup */
 711           /* GUIs generally have their own command loop, mainloop, or whatever.
 712              This is a good place to gain control because many error
 713              conditions will end up here via longjmp(). */
 714           if (command_loop_hook)
 715             command_loop_hook ();
 716           else
 717             command_loop ();
 718           quit_command ((char *) 0, instream == stdin);
 719         }
 720     }
 721   /* NOTE: If the command_loop() returned normally, the loop would
 722      attempt to exit by calling the function quit_command().  That
 723      function would either call exit() or throw an error returning
 724      control to SET_TOP_LEVEL. */
 725   /* NOTE: The function do_cleanups() was called once each time round
 726      the loop.  The usefulness of the call isn't clear.  If an error
 727      was thrown, everything would have already been cleaned up.  If
 728      command_loop() returned normally and quit_command() was called,
 729      either exit() or error() (again cleaning up) would be called. */
 730 #endif
 731   /* NOTE: cagney/1999-11-07: There is probably no reason for not
 732      moving this loop and the code found in captured_command_loop()
 733      into the command_loop() proper.  The main thing holding back that
 734      change - SET_TOP_LEVEL() - has been eliminated. */
 735   while (1)
 736     {
 737       catch_errors (captured_command_loop, 0, "", RETURN_MASK_ALL);
 738     }
 739 #endif
 740   /* No exit -- exit is through quit_command.  */
 741 }
 742
 743 int
 744 main (int argc, char **argv)
 745 {
 746   struct captured_main_args args;
 747   args.argc = argc;
 748   args.argv = argv;
 749   catch_errors (captured_main, &args, "", RETURN_MASK_ALL);
 750   return 0;
 751 }
 752
 753
 754 /* Don't use *_filtered for printing help.  We don't want to prompt
 755    for continue no matter how small the screen or how much we're going
 756    to print.  */
 757
 758 static void
 759 print_gdb_help (struct ui_file *stream)
 760 {
 761   fputs_unfiltered ("\
 762 This is the GNU debugger.  Usage:\n\n\
 763     gdb [options] [executable-file [core-file or process-id]]\n\n\
 764 Options:\n\n\
 765 ", stream);
 766   fputs_unfiltered ("\
 767   --[no]async        Enable (disable) asynchronous version of CLI\n\
 768 ", stream);
 769   fputs_unfiltered ("\
 770   -b BAUDRATE        Set serial port baud rate used for remote debugging.\n\
 771   --batch            Exit after processing options.\n\
 772   --cd=DIR           Change current directory to DIR.\n\
 773   --command=FILE     Execute GDB commands from FILE.\n\
 774   --core=COREFILE    Analyze the core dump COREFILE.\n\
 775 ", stream);
 776   fputs_unfiltered ("\
 777   --dbx              DBX compatibility mode.\n\
 778   --directory=DIR    Search for source files in DIR.\n\
 779   --epoch            Output information used by epoch emacs-GDB interface.\n\
 780   --exec=EXECFILE    Use EXECFILE as the executable.\n\
 781   --fullname         Output information used by emacs-GDB interface.\n\
 782   --help             Print this message.\n\
 783 ", stream);
 784   fputs_unfiltered ("\
 785   --interpreter=INTERP\n\
 786                      Select a specific interpreter / user interface\n\
 787 ", stream);
 788   fputs_unfiltered ("\
 789   --mapped           Use mapped symbol files if supported on this system.\n\
 790   --nw               Do not use a window interface.\n\
 791   --nx               Do not read ", stream);
 792   fputs_unfiltered (gdbinit, stream);
 793   fputs_unfiltered (" file.\n\
 794   --quiet            Do not print version number on startup.\n\
 795   --readnow          Fully read symbol files on first access.\n\
 796 ", stream);
 797   fputs_unfiltered ("\
 798   --se=FILE          Use FILE as symbol file and executable file.\n\
 799   --symbols=SYMFILE  Read symbols from SYMFILE.\n\
 800   --tty=TTY          Use TTY for input/output by the program being debugged.\n\
 801 ", stream);
 802 #if defined(TUI)
 803   fputs_unfiltered ("\
 804   --tui              Use a terminal user interface.\n\
 805 ", stream);
 806 #endif
 807   fputs_unfiltered ("\
 808   --version          Print version information and then exit.\n\
 809   -w                 Use a window interface.\n\
 810   --write            Set writing into executable and core files.\n\
 811   --xdb              XDB compatibility mode.\n\
 812 ", stream);
 813 #ifdef ADDITIONAL_OPTION_HELP
 814   fputs_unfiltered (ADDITIONAL_OPTION_HELP, stream);
 815 #endif
 816   fputs_unfiltered ("\n\
 817 For more information, type \"help\" from within GDB, or consult the\n\
 818 GDB manual (available as on-line info or a printed manual).\n\
 819 Report bugs to \"bug-gdb@gnu.org\".\
 820 ", stream);
 821 }