gas/as.c

   1 /* as.c - GAS main program.
   2    Copyright (C) 1987, 1990, 1991, 1992, 1994 Free Software Foundation, Inc.
   3
   4    This file is part of GAS, the GNU Assembler.
   5
   6    GAS 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, or (at your option)
   9    any later version.
  10
  11    GAS 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 GAS; see the file COPYING.  If not, write to
  18    the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
  19
  20 /*
  21  * Main program for AS; a 32-bit assembler of GNU.
  22  * Understands command arguments.
  23  * Has a few routines that don't fit in other modules because they
  24  * are shared.
  25  *
  26  *
  27  *                      bugs
  28  *
  29  * : initialisers
  30  *      Since no-one else says they will support them in future: I
  31  * don't support them now.
  32  *
  33  */
  34
  35 #include "ansidecl.h"
  36 #include "libiberty.h"
  37
  38 #include <stdio.h>
  39 #include <string.h>
  40
  41 #ifdef _POSIX_SOURCE
  42 #include <sys/types.h>          /* For pid_t in signal.h */
  43 #endif
  44 #include <signal.h>
  45
  46 #define COMMON
  47
  48 #include "as.h"
  49 #include "subsegs.h"
  50 #include "output-file.h"
  51
  52 #ifndef SIGTY
  53 #ifdef __STDC__
  54 #define SIGTY void
  55 #else
  56 #define SIGTY int
  57 #endif /* __STDC__ */
  58 #endif /* SIGTY */
  59
  60 #if 0
  61 /* Not currently used.  */
  62 static SIGTY got_sig PARAMS ((int sig));
  63 #endif
  64 static void perform_an_assembly_pass PARAMS ((int argc, char **argv));
  65
  66 #ifndef EXIT_SUCCESS
  67 #define EXIT_SUCCESS 0
  68 #define EXIT_FAILURE 1
  69 #endif
  70
  71 int listing;                    /* true if a listing is wanted */
  72
  73 char *myname;                   /* argv[0] */
  74 #ifdef BFD_ASSEMBLER
  75 segT reg_section, expr_section;
  76 segT text_section, data_section, bss_section;
  77 #endif
  78
  79 /* This is true if the assembler should output time and space usage. */
  80
  81 static int statistics_flag = 0;
  82
  83 \f
  84 void
  85 print_version_id ()
  86 {
  87   static int printed;
  88   if (printed)
  89     return;
  90   printed = 1;
  91
  92   fprintf (stderr, "GNU assembler version %s (%s)", GAS_VERSION, TARGET_ALIAS);
  93 #ifdef BFD_ASSEMBLER
  94   fprintf (stderr, ", using BFD version %s", BFD_VERSION);
  95 #endif
  96   fprintf (stderr, "\n");
  97 }
  98
  99 void
 100 show_usage (stream)
 101      FILE *stream;
 102 {
 103   fprintf (stream, "Usage: %s [option...] [asmfile...]\n", myname);
 104
 105   fprintf (stream, "\
 106 Options:\n\
 107 -a[sub-option...]       turn on listings\n\
 108   Sub-options [default hls]:\n\
 109   d     omit debugging directives\n\
 110   h     include high-level source\n\
 111   l     include assembly\n\
 112   n     omit forms processing\n\
 113   s     include symbols\n\
 114 -D                      ignored\n\
 115 -f                      skip whitespace and comment preprocessing\n\
 116 --help                  show this message and exit\n\
 117 -I DIR                  add DIR to search list for .include directives\n\
 118 -J                      don't warn about signed overflow\n\
 119 -K                      warn when differences altered for long displacements\n\
 120 -L                      keep local symbols (starting with `L')\n");
 121   fprintf (stream, "\
 122 -o OBJFILE              name the object-file output OBJFILE (default a.out)\n\
 123 -R                      fold data section into text section\n\
 124 --statistics            print maximum bytes and total seconds used\n\
 125 -v                      print assembler version number\n\
 126 --version               print assembler version number and exit\n\
 127 -W                      suppress warnings\n\
 128 -w                      ignored\n\
 129 -x                      ignored\n\
 130 -Z                      generate object file even after errors\n");
 131
 132   md_show_usage (stream);
 133 }
 134
 135 /*
 136  * Parse arguments, but we are only interested in flags.
 137  * When we find a flag, we process it then make it's argv[] NULL.
 138  * This helps any future argv[] scanners avoid what we processed.
 139  * Since it is easy to do here we interpret the special arg "-"
 140  * to mean "use stdin" and we set that argv[] pointing to "".
 141  * After we have munged argv[], the only things left are source file
 142  * name(s) and ""(s) denoting stdin. These file names are used
 143  * (perhaps more than once) later.
 144  *
 145  * check for new machine-dep cmdline options in
 146  * md_parse_option definitions in config/tc-*.c
 147  */
 148
 149 void
 150 parse_args (pargc, pargv)
 151      int *pargc;
 152      char ***pargv;
 153 {
 154   int old_argc, new_argc;
 155   char **old_argv, **new_argv;
 156
 157   /* Starting the short option string with '-' is for programs that
 158      expect options and other ARGV-elements in any order and that care about
 159      the ordering of the two.  We describe each non-option ARGV-element
 160      as if it were the argument of an option with character code 1.  */
 161
 162   char *shortopts;
 163   extern CONST char *md_shortopts;
 164   CONST char *std_shortopts = "-1JKLRWZfa::DI:o:vwX";
 165
 166   struct option *longopts;
 167   extern struct option md_longopts[];
 168   extern size_t md_longopts_size;
 169   static struct option std_longopts[] = {
 170 #define OPTION_HELP (OPTION_STD_BASE)
 171     {"help", no_argument, NULL, OPTION_HELP},
 172 #define OPTION_NOCPP (OPTION_STD_BASE + 1)
 173     {"nocpp", no_argument, NULL, OPTION_NOCPP},
 174 #define OPTION_STATISTICS (OPTION_STD_BASE + 2)
 175     {"statistics", no_argument, NULL, OPTION_STATISTICS},
 176 #define OPTION_VERSION (OPTION_STD_BASE + 3)
 177     {"version", no_argument, NULL, OPTION_VERSION},
 178   };
 179
 180   /* Construct the option lists from the standard list and the
 181      target dependent list.  */
 182   shortopts = concat (std_shortopts, md_shortopts, (char *) NULL);
 183   longopts = xmalloc (sizeof (std_longopts) + md_longopts_size);
 184   memcpy (longopts, std_longopts, sizeof (std_longopts));
 185   memcpy ((char *) longopts + sizeof (std_longopts),
 186           md_longopts, md_longopts_size);
 187
 188   /* Make a local copy of the old argv.  */
 189   old_argc = *pargc;
 190   old_argv = *pargv;
 191
 192   /* Initialize a new argv that contains no options.  */
 193   new_argv = (char **) xmalloc (sizeof (char *) * (old_argc + 1));
 194   new_argv[0] = old_argv[0];
 195   new_argc = 1;
 196   new_argv[new_argc] = NULL;
 197
 198   while (1)
 199     {
 200       /* getopt_long_only is like getopt_long, but '-' as well as '--' can
 201          indicate a long option.  */
 202       int longind;
 203       int optc = getopt_long_only (old_argc, old_argv, shortopts, longopts,
 204                                    &longind);
 205
 206       if (optc == -1)
 207         break;
 208
 209       switch (optc)
 210         {
 211         default:
 212           /* md_parse_option should return 1 if it recognizes optc,
 213              0 if not.  */
 214           if (md_parse_option (optc, optarg) == 0)
 215             exit (EXIT_FAILURE);
 216           break;
 217
 218         case '?':
 219           exit (EXIT_FAILURE);
 220
 221         case 1:                 /* File name.  */
 222           if (!strcmp (optarg, "-"))
 223             optarg = "";
 224           new_argv[new_argc++] = optarg;
 225           new_argv[new_argc] = NULL;
 226           break;
 227
 228         case OPTION_HELP:
 229           show_usage (stdout);
 230           exit (0);
 231
 232         case OPTION_NOCPP:
 233           break;
 234
 235         case OPTION_STATISTICS:
 236           statistics_flag = 1;
 237           break;
 238
 239         case OPTION_VERSION:
 240           print_version_id ();
 241           exit (0);
 242
 243         case '1':
 244         case 'J':
 245         case 'K':
 246         case 'L':
 247         case 'R':
 248         case 'W':
 249         case 'Z':
 250         case 'f':
 251           flagseen[(unsigned char) optc] = 1;
 252           break;
 253
 254         case 'a':
 255           if (optarg)
 256             {
 257               while (*optarg)
 258                 {
 259                   switch (*optarg)
 260                     {
 261                     case 'd':
 262                       listing |= LISTING_NODEBUG;
 263                       break;
 264                     case 'h':
 265                       listing |= LISTING_HLL;
 266                       break;
 267                     case 'l':
 268                       listing |= LISTING_LISTING;
 269                       break;
 270                     case 'n':
 271                       listing |= LISTING_NOFORM;
 272                       break;
 273                     case 's':
 274                       listing |= LISTING_SYMBOLS;
 275                       break;
 276                     default:
 277                       as_bad ("invalid listing option `%c'", *optarg);
 278                       exit (EXIT_FAILURE);
 279                       break;
 280                     }
 281                   optarg++;
 282                 }
 283             }
 284           if (!listing)
 285             listing = LISTING_DEFAULT;
 286           break;
 287
 288         case 'D':
 289           /* DEBUG is implemented: it debugs different */
 290           /* things to other people's assemblers. */
 291           break;
 292
 293         case 'I':
 294           {                     /* Include file directory */
 295             char *temp = strdup (optarg);
 296             if (!temp)
 297               as_fatal ("virtual memory exhausted");
 298             add_include_dir (temp);
 299             break;
 300           }
 301
 302         case 'o':
 303           out_file_name = strdup (optarg);
 304           if (!out_file_name)
 305             as_fatal ("virtual memory exhausted");
 306           break;
 307
 308         case 'v':
 309           print_version_id ();
 310           break;
 311
 312         case 'w':
 313           break;
 314
 315         case 'X':
 316           /* -X means treat warnings as errors */
 317           break;
 318         }
 319     }
 320
 321   free (shortopts);
 322   free (longopts);
 323
 324   *pargc = new_argc;
 325   *pargv = new_argv;
 326 }
 327
 328 int
 329 main (argc, argv)
 330      int argc;
 331      char **argv;
 332 {
 333   char a;
 334   int keep_it;
 335   long start_time = get_run_time ();
 336
 337 #if 0 /* do we need any of this?? */
 338   {
 339     static const int sig[] = {SIGHUP, SIGINT, SIGPIPE, SIGTERM, 0};
 340
 341     for (a = 0; sig[a] != 0; a++)
 342       if (signal (sig[a], SIG_IGN) != SIG_IGN)
 343         signal (sig[a], got_sig);
 344   }
 345 #endif
 346
 347   myname = argv[0];
 348   memset (flagseen, '\0', sizeof (flagseen));   /* aint seen nothing yet */
 349 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
 350 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
 351 #endif
 352   out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
 353
 354 #ifdef BFD_ASSEMBLER
 355   bfd_init ();
 356 #endif
 357
 358   symbol_begin ();
 359   subsegs_begin ();
 360   read_begin ();
 361   input_scrub_begin ();
 362   frag_init ();
 363   parse_args (&argc, &argv);
 364
 365 #ifdef BFD_ASSEMBLER
 366   output_file_create (out_file_name);
 367   assert (stdoutput != 0);
 368 #endif
 369
 370 #ifdef tc_init_after_args
 371   tc_init_after_args ();
 372 #endif
 373
 374   /* Here with flags set up in flagseen[]. */
 375   perform_an_assembly_pass (argc, argv);        /* Assemble it. */
 376 #ifdef TC_I960
 377   brtab_emit ();
 378 #endif
 379
 380   if (seen_at_least_1_file ()
 381       && !((had_warnings () && flagseen['Z'])
 382            || had_errors () > 0))
 383     keep_it = 1;
 384   else
 385     keep_it = 0;
 386
 387   if (keep_it)
 388     write_object_file ();
 389
 390 #ifndef NO_LISTING
 391   listing_print ("");
 392 #endif
 393
 394 #ifndef OBJ_VMS /* does its own file handling */
 395 #ifndef BFD_ASSEMBLER
 396   if (keep_it)
 397 #endif
 398     output_file_close (out_file_name);
 399 #endif
 400
 401   if (!keep_it)
 402     unlink (out_file_name);
 403
 404   input_scrub_end ();
 405 #ifdef md_end
 406   md_end ();
 407 #endif
 408
 409   if (statistics_flag)
 410     {
 411       extern char **environ;
 412       char *lim = (char *) sbrk (0);
 413       long run_time = get_run_time () - start_time;
 414
 415       fprintf (stderr, "%s: total time in assembly: %ld.%06ld\n",
 416                myname, run_time / 1000000, run_time % 1000000);
 417       fprintf (stderr, "%s: data size %ld\n",
 418                myname, (long) (lim - (char *) &environ));
 419     }
 420
 421   if ((had_warnings () && flagseen['Z'])
 422       || had_errors () > 0)
 423     return EXIT_FAILURE;
 424   return EXIT_SUCCESS;
 425 }
 426 \f
 427
 428 /*                      perform_an_assembly_pass()
 429  *
 430  * Here to attempt 1 pass over each input file.
 431  * We scan argv[*] looking for filenames or exactly "" which is
 432  * shorthand for stdin. Any argv that is NULL is not a file-name.
 433  * We set need_pass_2 TRUE if, after this, we still have unresolved
 434  * expressions of the form (unknown value)+-(unknown value).
 435  *
 436  * Note the un*x semantics: there is only 1 logical input file, but it
 437  * may be a catenation of many 'physical' input files.
 438  */
 439 static void
 440 perform_an_assembly_pass (argc, argv)
 441      int argc;
 442      char **argv;
 443 {
 444   int saw_a_file = 0;
 445 #ifdef BFD_ASSEMBLER
 446   flagword applicable;
 447 #endif
 448
 449   need_pass_2 = 0;
 450
 451 #ifndef BFD_ASSEMBLER
 452 #ifdef MANY_SEGMENTS
 453   {
 454     unsigned int i;
 455     for (i = SEG_E0; i < SEG_UNKNOWN; i++)
 456       segment_info[i].fix_root = 0;
 457   }
 458   /* Create the three fixed ones */
 459   {
 460     segT seg;
 461
 462 #ifdef TE_APOLLO
 463     seg = subseg_new (".wtext", 0);
 464 #else
 465     seg = subseg_new (".text", 0);
 466 #endif
 467     assert (seg == SEG_E0);
 468     seg = subseg_new (".data", 0);
 469     assert (seg == SEG_E1);
 470     seg = subseg_new (".bss", 0);
 471     assert (seg == SEG_E2);
 472 #ifdef TE_APOLLO
 473     create_target_segments ();
 474 #endif
 475   }
 476
 477 #else /* not MANY_SEGMENTS */
 478   text_fix_root = NULL;
 479   data_fix_root = NULL;
 480   bss_fix_root = NULL;
 481 #endif /* not MANY_SEGMENTS */
 482 #else /* BFD_ASSEMBLER */
 483   /* Create the standard sections, and those the assembler uses
 484      internally.  */
 485   text_section = subseg_new (".text", 0);
 486   data_section = subseg_new (".data", 0);
 487   bss_section = subseg_new (".bss", 0);
 488   /* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
 489      to have relocs, otherwise we don't find out in time. */
 490   applicable = bfd_applicable_section_flags (stdoutput);
 491   bfd_set_section_flags (stdoutput, text_section,
 492                          applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
 493                                        | SEC_CODE | SEC_READONLY));
 494   /* @@ FIXME -- SEC_CODE seems to mean code only, rather than code possibly.*/
 495   bfd_set_section_flags (stdoutput, data_section,
 496                          applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC));
 497   bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
 498   seg_info (bss_section)->bss = 1;
 499   subseg_new (BFD_ABS_SECTION_NAME, 0);
 500   subseg_new (BFD_UND_SECTION_NAME, 0);
 501   reg_section = subseg_new ("*GAS `reg' section*", 0);
 502   expr_section = subseg_new ("*GAS `expr' section*", 0);
 503
 504 #endif /* BFD_ASSEMBLER */
 505
 506   subseg_set (text_section, 0);
 507
 508   /* This may add symbol table entries, which requires having an open BFD,
 509      and sections already created, in BFD_ASSEMBLER mode.  */
 510   md_begin ();
 511
 512   argv++;                       /* skip argv[0] */
 513   argc--;                       /* skip argv[0] */
 514   while (argc--)
 515     {
 516       if (*argv)
 517         {                       /* Is it a file-name argument? */
 518           saw_a_file++;
 519           /* argv->"" if stdin desired, else->filename */
 520           read_a_source_file (*argv);
 521         }
 522       argv++;                   /* completed that argv */
 523     }
 524   if (!saw_a_file)
 525     read_a_source_file ("");
 526 }                               /* perform_an_assembly_pass() */
 527 \f
 528 #if 0
 529 /* This is not currently used.  */
 530 static SIGTY
 531 got_sig (sig)
 532      int sig;
 533 {
 534   static here_before = 0;
 535
 536   as_bad ("Interrupted by signal %d", sig);
 537   if (here_before++)
 538     exit (EXIT_FAILURE);
 539 #if 0 /* If SIGTY is void, this produces warnings.  */
 540   return ((SIGTY) 0);
 541 #endif
 542 }
 543 #endif
 544
 545 /* end of as.c */