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   fprintf (stream, "\
 115 -D                      produce assembler debugging messages\n\
 116 -f                      skip whitespace and comment preprocessing\n\
 117 --help                  show this message and exit\n\
 118 -I DIR                  add DIR to search list for .include directives\n\
 119 -J                      don't warn about signed overflow\n\
 120 -K                      warn when differences altered for long displacements\n\
 121 -L                      keep local symbols (starting with `L')\n");
 122   fprintf (stream, "\
 123 -nocpp                  ignored\n\
 124 -o OBJFILE              name the object-file output OBJFILE (default a.out)\n\
 125 -R                      fold data section into text section\n\
 126 --statistics            print maximum bytes and total seconds used\n\
 127 --version               print assembler version number and exit\n\
 128 -W                      suppress warnings\n\
 129 -w                      ignored\n\
 130 -X                      ignored\n\
 131 -Z                      generate object file even after errors\n");
 132
 133   md_show_usage (stream);
 134 }
 135
 136 /*
 137  * Since it is easy to do here we interpret the special arg "-"
 138  * to mean "use stdin" and we set that argv[] pointing to "".
 139  * After we have munged argv[], the only things left are source file
 140  * name(s) and ""(s) denoting stdin. These file names are used
 141  * (perhaps more than once) later.
 142  *
 143  * check for new machine-dep cmdline options in
 144  * md_parse_option definitions in config/tc-*.c
 145  */
 146
 147 void
 148 parse_args (pargc, pargv)
 149      int *pargc;
 150      char ***pargv;
 151 {
 152   int old_argc, new_argc;
 153   char **old_argv, **new_argv;
 154
 155   /* Starting the short option string with '-' is for programs that
 156      expect options and other ARGV-elements in any order and that care about
 157      the ordering of the two.  We describe each non-option ARGV-element
 158      as if it were the argument of an option with character code 1.  */
 159
 160   char *shortopts;
 161   extern CONST char *md_shortopts;
 162   /* -v takes an argument on VMS, so we don't make it a generic option
 163      in that case.  */
 164 #ifdef OBJ_VMS
 165   CONST char *std_shortopts = "-JKLRWZfa::DI:o:wX";
 166 #else
 167   /* Normal set of short options.  */
 168   CONST char *std_shortopts = "-JKLRWZfa::DI:o:vwX";
 169 #endif
 170
 171   struct option *longopts;
 172   extern struct option md_longopts[];
 173   extern size_t md_longopts_size;
 174   static struct option std_longopts[] = {
 175 #define OPTION_HELP (OPTION_STD_BASE)
 176     {"help", no_argument, NULL, OPTION_HELP},
 177 #define OPTION_NOCPP (OPTION_STD_BASE + 1)
 178     {"nocpp", no_argument, NULL, OPTION_NOCPP},
 179 #define OPTION_STATISTICS (OPTION_STD_BASE + 2)
 180     {"statistics", no_argument, NULL, OPTION_STATISTICS},
 181 #define OPTION_VERSION (OPTION_STD_BASE + 3)
 182     {"version", no_argument, NULL, OPTION_VERSION},
 183   };
 184
 185   /* Construct the option lists from the standard list and the
 186      target dependent list.  */
 187   shortopts = concat (std_shortopts, md_shortopts, (char *) NULL);
 188   longopts = (struct option *) xmalloc (sizeof (std_longopts) + md_longopts_size);
 189   memcpy (longopts, std_longopts, sizeof (std_longopts));
 190   memcpy ((char *) longopts + sizeof (std_longopts),
 191           md_longopts, md_longopts_size);
 192
 193   /* Make a local copy of the old argv.  */
 194   old_argc = *pargc;
 195   old_argv = *pargv;
 196
 197   /* Initialize a new argv that contains no options.  */
 198   new_argv = (char **) xmalloc (sizeof (char *) * (old_argc + 1));
 199   new_argv[0] = old_argv[0];
 200   new_argc = 1;
 201   new_argv[new_argc] = NULL;
 202
 203   while (1)
 204     {
 205       /* getopt_long_only is like getopt_long, but '-' as well as '--' can
 206          indicate a long option.  */
 207       int longind;
 208       int optc = getopt_long_only (old_argc, old_argv, shortopts, longopts,
 209                                    &longind);
 210
 211       if (optc == -1)
 212         break;
 213
 214       switch (optc)
 215         {
 216         default:
 217           /* md_parse_option should return 1 if it recognizes optc,
 218              0 if not.  */
 219           if (md_parse_option (optc, optarg) == 0)
 220             exit (EXIT_FAILURE);
 221           break;
 222
 223         case '?':
 224           exit (EXIT_FAILURE);
 225
 226         case 1:                 /* File name.  */
 227           if (!strcmp (optarg, "-"))
 228             optarg = "";
 229           new_argv[new_argc++] = optarg;
 230           new_argv[new_argc] = NULL;
 231           break;
 232
 233         case OPTION_HELP:
 234           show_usage (stdout);
 235           exit (0);
 236
 237         case OPTION_NOCPP:
 238           break;
 239
 240         case OPTION_STATISTICS:
 241           statistics_flag = 1;
 242           break;
 243
 244         case OPTION_VERSION:
 245           print_version_id ();
 246           exit (0);
 247
 248         case 'v':
 249           print_version_id ();
 250
 251         case 'J':
 252           flag_signed_overflow_ok = 1;
 253           break;
 254
 255         case 'K':
 256           flag_warn_displacement = 1;
 257           break;
 258
 259         case 'L':
 260           flag_keep_locals = 1;
 261           break;
 262
 263         case 'R':
 264           flag_readonly_data_in_text = 1;
 265           break;
 266
 267         case 'W':
 268           flag_no_warnings = 1;
 269           break;
 270
 271         case 'Z':
 272           flag_always_generate_output = 1;
 273           break;
 274
 275         case 'a':
 276           if (optarg)
 277             {
 278               while (*optarg)
 279                 {
 280                   switch (*optarg)
 281                     {
 282                     case 'd':
 283                       listing |= LISTING_NODEBUG;
 284                       break;
 285                     case 'h':
 286                       listing |= LISTING_HLL;
 287                       break;
 288                     case 'l':
 289                       listing |= LISTING_LISTING;
 290                       break;
 291                     case 'n':
 292                       listing |= LISTING_NOFORM;
 293                       break;
 294                     case 's':
 295                       listing |= LISTING_SYMBOLS;
 296                       break;
 297                     default:
 298                       as_bad ("invalid listing option `%c'", *optarg);
 299                       exit (EXIT_FAILURE);
 300                       break;
 301                     }
 302                   optarg++;
 303                 }
 304             }
 305           if (!listing)
 306             listing = LISTING_DEFAULT;
 307           break;
 308
 309         case 'D':
 310           /* DEBUG is implemented: it debugs different */
 311           /* things from other people's assemblers. */
 312           flag_debug = 1;
 313           break;
 314
 315         case 'f':
 316           flag_no_comments = 1;
 317           break;
 318
 319         case 'I':
 320           {                     /* Include file directory */
 321             char *temp = strdup (optarg);
 322             if (!temp)
 323               as_fatal ("virtual memory exhausted");
 324             add_include_dir (temp);
 325             break;
 326           }
 327
 328         case 'o':
 329           out_file_name = strdup (optarg);
 330           if (!out_file_name)
 331             as_fatal ("virtual memory exhausted");
 332           break;
 333
 334         case 'w':
 335           break;
 336
 337         case 'X':
 338           /* -X means treat warnings as errors */
 339           break;
 340         }
 341     }
 342
 343   free (shortopts);
 344   free (longopts);
 345
 346   *pargc = new_argc;
 347   *pargv = new_argv;
 348 }
 349
 350 int
 351 main (argc, argv)
 352      int argc;
 353      char **argv;
 354 {
 355   int keep_it;
 356   long start_time = get_run_time ();
 357
 358 #ifdef HOST_SPECIAL_INIT
 359   HOST_SPECIAL_INIT (argc, argv);
 360 #endif
 361
 362 #if 0 /* do we need any of this?? */
 363   {
 364     static const int sig[] = {SIGHUP, SIGINT, SIGPIPE, SIGTERM, 0};
 365     int a;
 366
 367     for (a = 0; sig[a] != 0; a++)
 368       if (signal (sig[a], SIG_IGN) != SIG_IGN)
 369         signal (sig[a], got_sig);
 370   }
 371 #endif
 372
 373   myname = argv[0];
 374 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
 375 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
 376 #endif
 377   out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
 378
 379 #ifdef BFD_ASSEMBLER
 380   bfd_init ();
 381 #endif
 382
 383   symbol_begin ();
 384   subsegs_begin ();
 385   read_begin ();
 386   input_scrub_begin ();
 387   frag_init ();
 388   parse_args (&argc, &argv);
 389
 390 #ifdef BFD_ASSEMBLER
 391   output_file_create (out_file_name);
 392   assert (stdoutput != 0);
 393 #endif
 394
 395 #ifdef tc_init_after_args
 396   tc_init_after_args ();
 397 #endif
 398
 399   perform_an_assembly_pass (argc, argv);        /* Assemble it. */
 400 #ifdef TC_I960
 401   brtab_emit ();
 402 #endif
 403
 404   if (seen_at_least_1_file ()
 405       && !((had_warnings () && flag_always_generate_output)
 406            || had_errors () > 0))
 407     keep_it = 1;
 408   else
 409     keep_it = 0;
 410
 411   if (keep_it)
 412     write_object_file ();
 413
 414 #ifndef NO_LISTING
 415   listing_print ("");
 416 #endif
 417
 418 #ifndef OBJ_VMS /* does its own file handling */
 419 #ifndef BFD_ASSEMBLER
 420   if (keep_it)
 421 #endif
 422     output_file_close (out_file_name);
 423 #endif
 424
 425   if (!keep_it)
 426     unlink (out_file_name);
 427
 428   input_scrub_end ();
 429 #ifdef md_end
 430   md_end ();
 431 #endif
 432
 433   if (statistics_flag)
 434     {
 435       extern char **environ;
 436       char *lim = (char *) sbrk (0);
 437       long run_time = get_run_time () - start_time;
 438
 439       fprintf (stderr, "%s: total time in assembly: %ld.%06ld\n",
 440                myname, run_time / 1000000, run_time % 1000000);
 441       fprintf (stderr, "%s: data size %ld\n",
 442                myname, (long) (lim - (char *) &environ));
 443     }
 444
 445   if ((had_warnings () && flag_always_generate_output)
 446       || had_errors () > 0)
 447     return EXIT_FAILURE;
 448   return EXIT_SUCCESS;
 449 }
 450 \f
 451
 452 /*                      perform_an_assembly_pass()
 453  *
 454  * Here to attempt 1 pass over each input file.
 455  * We scan argv[*] looking for filenames or exactly "" which is
 456  * shorthand for stdin. Any argv that is NULL is not a file-name.
 457  * We set need_pass_2 TRUE if, after this, we still have unresolved
 458  * expressions of the form (unknown value)+-(unknown value).
 459  *
 460  * Note the un*x semantics: there is only 1 logical input file, but it
 461  * may be a catenation of many 'physical' input files.
 462  */
 463 static void
 464 perform_an_assembly_pass (argc, argv)
 465      int argc;
 466      char **argv;
 467 {
 468   int saw_a_file = 0;
 469 #ifdef BFD_ASSEMBLER
 470   flagword applicable;
 471 #endif
 472
 473   need_pass_2 = 0;
 474
 475 #ifndef BFD_ASSEMBLER
 476 #ifdef MANY_SEGMENTS
 477   {
 478     unsigned int i;
 479     for (i = SEG_E0; i < SEG_UNKNOWN; i++)
 480       segment_info[i].fix_root = 0;
 481   }
 482   /* Create the three fixed ones */
 483   {
 484     segT seg;
 485
 486 #ifdef TE_APOLLO
 487     seg = subseg_new (".wtext", 0);
 488 #else
 489     seg = subseg_new (".text", 0);
 490 #endif
 491     assert (seg == SEG_E0);
 492     seg = subseg_new (".data", 0);
 493     assert (seg == SEG_E1);
 494     seg = subseg_new (".bss", 0);
 495     assert (seg == SEG_E2);
 496 #ifdef TE_APOLLO
 497     create_target_segments ();
 498 #endif
 499   }
 500
 501 #else /* not MANY_SEGMENTS */
 502   text_fix_root = NULL;
 503   data_fix_root = NULL;
 504   bss_fix_root = NULL;
 505 #endif /* not MANY_SEGMENTS */
 506 #else /* BFD_ASSEMBLER */
 507   /* Create the standard sections, and those the assembler uses
 508      internally.  */
 509   text_section = subseg_new (".text", 0);
 510   data_section = subseg_new (".data", 0);
 511   bss_section = subseg_new (".bss", 0);
 512   /* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
 513      to have relocs, otherwise we don't find out in time. */
 514   applicable = bfd_applicable_section_flags (stdoutput);
 515   bfd_set_section_flags (stdoutput, text_section,
 516                          applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
 517                                        | SEC_CODE | SEC_READONLY));
 518   /* @@ FIXME -- SEC_CODE seems to mean code only, rather than code possibly.*/
 519   bfd_set_section_flags (stdoutput, data_section,
 520                          applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC));
 521   bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
 522   seg_info (bss_section)->bss = 1;
 523   subseg_new (BFD_ABS_SECTION_NAME, 0);
 524   subseg_new (BFD_UND_SECTION_NAME, 0);
 525   reg_section = subseg_new ("*GAS `reg' section*", 0);
 526   expr_section = subseg_new ("*GAS `expr' section*", 0);
 527
 528 #endif /* BFD_ASSEMBLER */
 529
 530   subseg_set (text_section, 0);
 531
 532   /* This may add symbol table entries, which requires having an open BFD,
 533      and sections already created, in BFD_ASSEMBLER mode.  */
 534   md_begin ();
 535
 536   argv++;                       /* skip argv[0] */
 537   argc--;                       /* skip argv[0] */
 538   while (argc--)
 539     {
 540       if (*argv)
 541         {                       /* Is it a file-name argument? */
 542           saw_a_file++;
 543           /* argv->"" if stdin desired, else->filename */
 544           read_a_source_file (*argv);
 545         }
 546       argv++;                   /* completed that argv */
 547     }
 548   if (!saw_a_file)
 549     read_a_source_file ("");
 550 }                               /* perform_an_assembly_pass() */
 551 \f
 552 #if 0
 553 /* This is not currently used.  */
 554 static SIGTY
 555 got_sig (sig)
 556      int sig;
 557 {
 558   static here_before = 0;
 559
 560   as_bad ("Interrupted by signal %d", sig);
 561   if (here_before++)
 562     exit (EXIT_FAILURE);
 563 #if 0 /* If SIGTY is void, this produces warnings.  */
 564   return ((SIGTY) 0);
 565 #endif
 566 }
 567 #endif
 568
 569 /* end of as.c */