gas/as.c

   1 /* as.c - GAS main program.
   2    Copyright (C) 1987, 1990, 91, 92, 93, 94, 95, 96, 97, 98, 99, 2000
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GAS, the GNU Assembler.
   6
   7    GAS is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2, or (at your option)
  10    any later version.
  11
  12    GAS is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GAS; see the file COPYING.  If not, write to the Free
  19    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20    02111-1307, USA. */
  21
  22 /*
  23  * Main program for AS; a 32-bit assembler of GNU.
  24  * Understands command arguments.
  25  * Has a few routines that don't fit in other modules because they
  26  * are shared.
  27  *
  28  *
  29  *                      bugs
  30  *
  31  * : initialisers
  32  *      Since no-one else says they will support them in future: I
  33  * don't support them now.
  34  *
  35  */
  36
  37 #include "ansidecl.h"
  38
  39 #define COMMON
  40
  41 #include "as.h"
  42 #include "subsegs.h"
  43 #include "output-file.h"
  44 #include "sb.h"
  45 #include "macro.h"
  46
  47 #ifdef HAVE_ITBL_CPU
  48 #include "itbl-ops.h"
  49 #else
  50 #define itbl_parse(itbl_file) 1
  51 #define itbl_init()
  52 #endif
  53
  54 #ifdef HAVE_SBRK
  55 #ifdef NEED_DECLARATION_SBRK
  56 extern PTR sbrk ();
  57 #endif
  58 #endif
  59
  60 static void show_usage PARAMS ((FILE *));
  61 static void parse_args PARAMS ((int *, char ***));
  62 static void dump_statistics PARAMS ((void));
  63 static void perform_an_assembly_pass PARAMS ((int argc, char **argv));
  64 static int macro_expr PARAMS ((const char *, int, sb *, int *));
  65
  66 int listing;                    /* true if a listing is wanted */
  67
  68 static char *listing_filename = NULL;   /* Name of listing file.  */
  69
  70 /* Type of debugging to generate.  */
  71
  72 enum debug_info_type debug_type = DEBUG_NONE;
  73
  74 /* Maximum level of macro nesting.  */
  75
  76 int max_macro_nest = 100;
  77
  78 char *myname;                   /* argv[0] */
  79 #ifdef BFD_ASSEMBLER
  80 segT reg_section, expr_section;
  81 segT text_section, data_section, bss_section;
  82 #endif
  83
  84 /* The default obstack chunk size.  If we set this to zero, the
  85    obstack code will use whatever will fit in a 4096 byte block.  */
  86 int chunksize = 0;
  87
  88 /* To monitor memory allocation more effectively, make this non-zero.
  89    Then the chunk sizes for gas and bfd will be reduced.  */
  90 int debug_memory = 0;
  91
  92 /* We build a list of defsyms as we read the options, and then define
  93    them after we have initialized everything.  */
  94
  95 struct defsym_list
  96 {
  97   struct defsym_list *next;
  98   char *name;
  99   valueT value;
 100 };
 101
 102 static struct defsym_list *defsyms;
 103
 104 /* Keep a record of the itbl files we read in. */
 105
 106 struct itbl_file_list
 107 {
 108   struct itbl_file_list *next;
 109   char *name;
 110 };
 111
 112 static struct itbl_file_list *itbl_files;
 113 \f
 114 #ifdef USE_EMULATIONS
 115 #define EMULATION_ENVIRON "AS_EMULATION"
 116
 117 extern struct emulation mipsbelf, mipslelf, mipself;
 118 extern struct emulation mipsbecoff, mipslecoff, mipsecoff;
 119 extern struct emulation i386coff, i386elf, i386aout;
 120
 121 static struct emulation *const emulations[] = { EMULATIONS };
 122 static const int n_emulations = sizeof (emulations) / sizeof (emulations[0]);
 123
 124 static void select_emulation_mode PARAMS ((int, char **));
 125
 126 static void
 127 select_emulation_mode (argc, argv)
 128      int argc;
 129      char **argv;
 130 {
 131   int i;
 132   char *p, *em = 0;
 133
 134   for (i = 1; i < argc; i++)
 135     if (!strncmp ("--em", argv[i], 4))
 136       break;
 137
 138   if (i == argc)
 139     goto do_default;
 140
 141   p = strchr (argv[i], '=');
 142   if (p)
 143     p++;
 144   else
 145     p = argv[i+1];
 146
 147   if (!p || !*p)
 148     as_fatal (_("missing emulation mode name"));
 149   em = p;
 150
 151  do_default:
 152   if (em == 0)
 153     em = getenv (EMULATION_ENVIRON);
 154   if (em == 0)
 155     em = DEFAULT_EMULATION;
 156
 157   if (em)
 158     {
 159       for (i = 0; i < n_emulations; i++)
 160         if (!strcmp (emulations[i]->name, em))
 161           break;
 162       if (i == n_emulations)
 163         as_fatal (_("unrecognized emulation name `%s'"), em);
 164       this_emulation = emulations[i];
 165     }
 166   else
 167     this_emulation = emulations[0];
 168
 169   this_emulation->init ();
 170 }
 171
 172 const char *
 173 default_emul_bfd_name ()
 174 {
 175   abort ();
 176   return NULL;
 177 }
 178
 179 void
 180 common_emul_init ()
 181 {
 182   this_format = this_emulation->format;
 183
 184   if (this_emulation->leading_underscore == 2)
 185     this_emulation->leading_underscore = this_format->dfl_leading_underscore;
 186
 187   if (this_emulation->default_endian != 2)
 188     target_big_endian = this_emulation->default_endian;
 189
 190   if (this_emulation->fake_label_name == 0)
 191     {
 192       if (this_emulation->leading_underscore)
 193         this_emulation->fake_label_name = "L0\001";
 194       else
 195         /* What other parameters should we test?  */
 196         this_emulation->fake_label_name = ".L0\001";
 197     }
 198 }
 199 #endif
 200
 201 void
 202 print_version_id ()
 203 {
 204   static int printed;
 205   if (printed)
 206     return;
 207   printed = 1;
 208
 209 #ifdef BFD_ASSEMBLER
 210   fprintf (stderr, _("GNU assembler version %s (%s) using BFD version %s"),
 211            VERSION, TARGET_ALIAS, BFD_VERSION);
 212 #else
 213   fprintf (stderr, _("GNU assembler version %s (%s)"), VERSION, TARGET_ALIAS);
 214 #endif
 215   fprintf (stderr, "\n");
 216 }
 217
 218 static void
 219 show_usage (stream)
 220      FILE *stream;
 221 {
 222   fprintf (stream, _("Usage: %s [option...] [asmfile...]\n"), myname);
 223
 224   fprintf (stream, _("\
 225 Options:\n\
 226   -a[sub-option...]       turn on listings\n\
 227                           Sub-options [default hls]:\n\
 228                           c      omit false conditionals\n\
 229                           d      omit debugging directives\n\
 230                           h      include high-level source\n\
 231                           l      include assembly\n\
 232                           m      include macro expansions\n\
 233                           n      omit forms processing\n\
 234                           s      include symbols\n\
 235                           L      include line debug statistics (if applicable)\n\
 236                           =FILE  list to FILE (must be last sub-option)\n"));
 237
 238   fprintf (stream, _("\
 239   -D                      produce assembler debugging messages\n"));
 240   fprintf (stream, _("\
 241   --defsym SYM=VAL        define symbol SYM to given value\n"));
 242 #ifdef USE_EMULATIONS
 243   {
 244     int i;
 245     char *def_em;
 246
 247     fprintf (stream, "\
 248   --em=[");
 249     for (i = 0; i < n_emulations-1; i++)
 250       fprintf (stream, "%s | ", emulations[i]->name);
 251     fprintf (stream, "%s]\n", emulations[i]->name);
 252
 253     def_em = getenv (EMULATION_ENVIRON);
 254     if (!def_em)
 255       def_em = DEFAULT_EMULATION;
 256     fprintf (stream, _("\
 257                           emulate output (default %s)\n"), def_em);
 258   }
 259 #endif
 260   fprintf (stream, _("\
 261   -f                      skip whitespace and comment preprocessing\n"));
 262   fprintf (stream, _("\
 263   --gstabs                generate stabs debugging information\n"));
 264   fprintf (stream, _("\
 265   --gdwarf2               generate DWARF2 debugging information\n"));
 266   fprintf (stream, _("\
 267   --help                  show this message and exit\n"));
 268   fprintf (stream, _("\
 269   -I DIR                  add DIR to search list for .include directives\n"));
 270   fprintf (stream, _("\
 271   -J                      don't warn about signed overflow\n"));
 272   fprintf (stream, _("\
 273   -K                      warn when differences altered for long displacements\n"));
 274   fprintf (stream, _("\
 275   -L,--keep-locals        keep local symbols (e.g. starting with `L')\n"));
 276   fprintf (stream, _("\
 277   -M,--mri                assemble in MRI compatibility mode\n"));
 278   fprintf (stream, _("\
 279   --MD FILE               write dependency information in FILE (default none)\n"));
 280   fprintf (stream, _("\
 281   -nocpp                  ignored\n"));
 282   fprintf (stream, _("\
 283   -o OBJFILE              name the object-file output OBJFILE (default a.out)\n"));
 284   fprintf (stream, _("\
 285   -R                      fold data section into text section\n"));
 286   fprintf (stream, _("\
 287   --statistics            print various measured statistics from execution\n"));
 288   fprintf (stream, _("\
 289   --strip-local-absolute  strip local absolute symbols\n"));
 290   fprintf (stream, _("\
 291   --traditional-format    Use same format as native assembler when possible\n"));
 292   fprintf (stream, _("\
 293   --version               print assembler version number and exit\n"));
 294   fprintf (stream, _("\
 295   -W  --no-warn           suppress warnings\n"));
 296   fprintf (stream, _("\
 297   --warn                  don't suppress warnings\n"));
 298   fprintf (stream, _("\
 299   --fatal-warnings        treat warnings as errors\n"));
 300   fprintf (stream, _("\
 301   --itbl INSTTBL          extend instruction set to include instructions\n\
 302                           matching the specifications defined in file INSTTBL\n"));
 303   fprintf (stream, _("\
 304   -w                      ignored\n"));
 305   fprintf (stream, _("\
 306   -X                      ignored\n"));
 307   fprintf (stream, _("\
 308   -Z                      generate object file even after errors\n"));
 309   fprintf (stream, _("\
 310   --listing-lhs-width     set the width in words of the output data column of\n\
 311                           the listing\n"));
 312   fprintf (stream, _("\
 313   --listing-lhs-width2    set the width in words of the continuation lines\n\
 314                           of the output data column; ignored if smaller than\n\
 315                           the width of the first line\n"));
 316   fprintf (stream, _("\
 317   --listing-rhs-width     set the max width in characters of the lines from\n\
 318                           the source file\n"));
 319   fprintf (stream, _("\
 320   --listing-cont-lines    set the maximum number of continuation lines used\n\
 321                           for the output data column of the listing\n"));
 322
 323   md_show_usage (stream);
 324
 325   fputc ('\n', stream);
 326   fprintf (stream, REPORT_BUGS_TO);
 327 }
 328
 329 /*
 330  * Since it is easy to do here we interpret the special arg "-"
 331  * to mean "use stdin" and we set that argv[] pointing to "".
 332  * After we have munged argv[], the only things left are source file
 333  * name(s) and ""(s) denoting stdin. These file names are used
 334  * (perhaps more than once) later.
 335  *
 336  * check for new machine-dep cmdline options in
 337  * md_parse_option definitions in config/tc-*.c
 338  */
 339
 340 static void
 341 parse_args (pargc, pargv)
 342      int *pargc;
 343      char ***pargv;
 344 {
 345   int old_argc, new_argc;
 346   char **old_argv, **new_argv;
 347
 348   /* Starting the short option string with '-' is for programs that
 349      expect options and other ARGV-elements in any order and that care about
 350      the ordering of the two.  We describe each non-option ARGV-element
 351      as if it were the argument of an option with character code 1.  */
 352
 353   char *shortopts;
 354   extern CONST char *md_shortopts;
 355   static const char std_shortopts[] =
 356     {
 357       '-', 'J',
 358 #ifndef WORKING_DOT_WORD
 359       /* -K is not meaningful if .word is not being hacked.  */
 360       'K',
 361 #endif
 362       'L', 'M', 'R', 'W', 'Z', 'f', 'a', ':', ':', 'D', 'I', ':', 'o', ':',
 363 #ifndef VMS
 364       /* -v takes an argument on VMS, so we don't make it a generic
 365          option.  */
 366       'v',
 367 #endif
 368       'w', 'X',
 369       /* New option for extending instruction set (see also --itbl below) */
 370       't', ':',
 371       '\0'
 372     };
 373   struct option *longopts;
 374   extern struct option md_longopts[];
 375   extern size_t md_longopts_size;
 376   static const struct option std_longopts[] = {
 377 #define OPTION_HELP (OPTION_STD_BASE)
 378     {"help", no_argument, NULL, OPTION_HELP},
 379     {"keep-locals", no_argument, NULL, 'L'},
 380     {"mri", no_argument, NULL, 'M'},
 381 #define OPTION_NOCPP (OPTION_STD_BASE + 1)
 382     {"nocpp", no_argument, NULL, OPTION_NOCPP},
 383 #define OPTION_STATISTICS (OPTION_STD_BASE + 2)
 384     {"statistics", no_argument, NULL, OPTION_STATISTICS},
 385 #define OPTION_VERSION (OPTION_STD_BASE + 3)
 386     {"version", no_argument, NULL, OPTION_VERSION},
 387 #define OPTION_DUMPCONFIG (OPTION_STD_BASE + 4)
 388     {"dump-config", no_argument, NULL, OPTION_DUMPCONFIG},
 389 #define OPTION_VERBOSE (OPTION_STD_BASE + 5)
 390     {"verbose", no_argument, NULL, OPTION_VERBOSE},
 391 #define OPTION_EMULATION (OPTION_STD_BASE + 6)
 392     {"emulation", required_argument, NULL, OPTION_EMULATION},
 393 #define OPTION_DEFSYM (OPTION_STD_BASE + 7)
 394     {"defsym", required_argument, NULL, OPTION_DEFSYM},
 395 #define OPTION_INSTTBL (OPTION_STD_BASE + 8)
 396     /* New option for extending instruction set (see also -t above).
 397        The "-t file" or "--itbl file" option extends the basic set of
 398        valid instructions by reading "file", a text file containing a
 399        list of instruction formats.  The additional opcodes and their
 400        formats are added to the built-in set of instructions, and
 401        mnemonics for new registers may also be defined.  */
 402     {"itbl", required_argument, NULL, OPTION_INSTTBL},
 403 #define OPTION_LISTING_LHS_WIDTH (OPTION_STD_BASE + 9)
 404     {"listing-lhs-width", required_argument, NULL, OPTION_LISTING_LHS_WIDTH},
 405 #define OPTION_LISTING_LHS_WIDTH2 (OPTION_STD_BASE + 10)
 406     {"listing-lhs-width", required_argument, NULL, OPTION_LISTING_LHS_WIDTH2},
 407 #define OPTION_LISTING_RHS_WIDTH (OPTION_STD_BASE + 11)
 408     {"listing-rhs-width", required_argument, NULL, OPTION_LISTING_RHS_WIDTH},
 409 #define OPTION_LISTING_CONT_LINES (OPTION_STD_BASE + 12)
 410     {"listing-cont-lines", required_argument, NULL, OPTION_LISTING_CONT_LINES},
 411 #define OPTION_DEPFILE (OPTION_STD_BASE + 13)
 412     {"MD", required_argument, NULL, OPTION_DEPFILE},
 413 #define OPTION_GSTABS (OPTION_STD_BASE + 14)
 414     {"gstabs", no_argument, NULL, OPTION_GSTABS},
 415 #define OPTION_STRIP_LOCAL_ABSOLUTE (OPTION_STD_BASE + 15)
 416     {"strip-local-absolute", no_argument, NULL, OPTION_STRIP_LOCAL_ABSOLUTE},
 417 #define OPTION_TRADITIONAL_FORMAT (OPTION_STD_BASE + 16)
 418     {"traditional-format", no_argument, NULL, OPTION_TRADITIONAL_FORMAT},
 419 #define OPTION_GDWARF2 (OPTION_STD_BASE + 17)
 420     {"gdwarf2", no_argument, NULL, OPTION_GDWARF2},
 421     {"no-warn", no_argument, NULL, 'W'},
 422 #define OPTION_WARN (OPTION_STD_BASE + 18)
 423     {"warn", no_argument, NULL, OPTION_WARN},
 424 #define OPTION_WARN_FATAL (OPTION_STD_BASE + 19)
 425     {"fatal-warnings", no_argument, NULL, OPTION_WARN_FATAL}
 426   };
 427
 428   /* Construct the option lists from the standard list and the
 429      target dependent list.  */
 430   shortopts = concat (std_shortopts, md_shortopts, (char *) NULL);
 431   longopts = (struct option *) xmalloc (sizeof (std_longopts) + md_longopts_size);
 432   memcpy (longopts, std_longopts, sizeof (std_longopts));
 433   memcpy ((char *) longopts + sizeof (std_longopts),
 434           md_longopts, md_longopts_size);
 435
 436   /* Make a local copy of the old argv.  */
 437   old_argc = *pargc;
 438   old_argv = *pargv;
 439
 440   /* Initialize a new argv that contains no options.  */
 441   new_argv = (char **) xmalloc (sizeof (char *) * (old_argc + 1));
 442   new_argv[0] = old_argv[0];
 443   new_argc = 1;
 444   new_argv[new_argc] = NULL;
 445
 446   while (1)
 447     {
 448       /* getopt_long_only is like getopt_long, but '-' as well as '--' can
 449          indicate a long option.  */
 450       int longind;
 451       int optc = getopt_long_only (old_argc, old_argv, shortopts, longopts,
 452                                    &longind);
 453
 454       if (optc == -1)
 455         break;
 456
 457       switch (optc)
 458         {
 459         default:
 460           /* md_parse_option should return 1 if it recognizes optc,
 461              0 if not.  */
 462           if (md_parse_option (optc, optarg) != 0)
 463             break;
 464           /* `-v' isn't included in the general short_opts list, so check for
 465              it explicity here before deciding we've gotten a bad argument.  */
 466           if (optc == 'v')
 467             {
 468 #ifdef VMS
 469               /* Telling getopt to treat -v's value as optional can result
 470                  in it picking up a following filename argument here.  The
 471                  VMS code in md_parse_option can return 0 in that case,
 472                  but it has no way of pushing the filename argument back.  */
 473               if (optarg && *optarg)
 474                 new_argv[new_argc++] = optarg,  new_argv[new_argc] = NULL;
 475               else
 476 #else
 477               case 'v':
 478 #endif
 479               case OPTION_VERBOSE:
 480                 print_version_id ();
 481               break;
 482             }
 483           /*FALLTHRU*/
 484
 485         case '?':
 486           exit (EXIT_FAILURE);
 487
 488         case 1:                 /* File name.  */
 489           if (!strcmp (optarg, "-"))
 490             optarg = "";
 491           new_argv[new_argc++] = optarg;
 492           new_argv[new_argc] = NULL;
 493           break;
 494
 495         case OPTION_HELP:
 496           show_usage (stdout);
 497           exit (EXIT_SUCCESS);
 498
 499         case OPTION_NOCPP:
 500           break;
 501
 502         case OPTION_STATISTICS:
 503           flag_print_statistics = 1;
 504           break;
 505
 506         case OPTION_STRIP_LOCAL_ABSOLUTE:
 507           flag_strip_local_absolute = 1;
 508           break;
 509
 510         case OPTION_TRADITIONAL_FORMAT:
 511           flag_traditional_format = 1;
 512           break;
 513
 514         case OPTION_VERSION:
 515           /* This output is intended to follow the GNU standards document.  */
 516           printf (_("GNU assembler %s\n"), VERSION);
 517           printf (_("Copyright 1997 Free Software Foundation, Inc.\n"));
 518           printf (_("\
 519 This program is free software; you may redistribute it under the terms of\n\
 520 the GNU General Public License.  This program has absolutely no warranty.\n"));
 521           printf (_("This assembler was configured for a target of `%s'.\n"),
 522                   TARGET_ALIAS);
 523           exit (EXIT_SUCCESS);
 524
 525         case OPTION_EMULATION:
 526 #ifdef USE_EMULATIONS
 527           if (strcmp (optarg, this_emulation->name))
 528             as_fatal (_("multiple emulation names specified"));
 529 #else
 530           as_fatal (_("emulations not handled in this configuration"));
 531 #endif
 532           break;
 533
 534         case OPTION_DUMPCONFIG:
 535           fprintf (stderr, _("alias = %s\n"), TARGET_ALIAS);
 536           fprintf (stderr, _("canonical = %s\n"), TARGET_CANONICAL);
 537           fprintf (stderr, _("cpu-type = %s\n"), TARGET_CPU);
 538 #ifdef TARGET_OBJ_FORMAT
 539           fprintf (stderr, _("format = %s\n"), TARGET_OBJ_FORMAT);
 540 #endif
 541 #ifdef TARGET_FORMAT
 542           fprintf (stderr, _("bfd-target = %s\n"), TARGET_FORMAT);
 543 #endif
 544           exit (EXIT_SUCCESS);
 545
 546         case OPTION_DEFSYM:
 547           {
 548             char *s;
 549             long i;
 550             struct defsym_list *n;
 551
 552             for (s = optarg; *s != '\0' && *s != '='; s++)
 553               ;
 554             if (*s == '\0')
 555               as_fatal (_("bad defsym; format is --defsym name=value"));
 556             *s++ = '\0';
 557             i = strtol (s, (char **) NULL, 0);
 558             n = (struct defsym_list *) xmalloc (sizeof *n);
 559             n->next = defsyms;
 560             n->name = optarg;
 561             n->value = i;
 562             defsyms = n;
 563           }
 564           break;
 565
 566         case OPTION_INSTTBL:
 567         case 't':
 568           {
 569             /* optarg is the name of the file containing the instruction
 570                formats, opcodes, register names, etc. */
 571             struct itbl_file_list *n;
 572
 573             if (optarg == NULL)
 574               {
 575                 as_warn ( _("No file name following -t option\n") );
 576                 break;
 577               }
 578
 579             n = (struct itbl_file_list *) xmalloc (sizeof *n);
 580             n->next = itbl_files;
 581             n->name = optarg;
 582             itbl_files = n;
 583
 584             /* Parse the file and add the new instructions to our internal
 585                table.  If multiple instruction tables are specified, the
 586                information from this table gets appended onto the existing
 587                internal table. */
 588             itbl_files->name = xstrdup (optarg);
 589             if (itbl_parse (itbl_files->name) != 0)
 590               {
 591                 fprintf (stderr, _("Failed to read instruction table %s\n"),
 592                          itbl_files->name);
 593                 exit (EXIT_SUCCESS);
 594               }
 595           }
 596           break;
 597
 598         case OPTION_DEPFILE:
 599           start_dependencies (optarg);
 600           break;
 601
 602         case OPTION_GSTABS:
 603           debug_type = DEBUG_STABS;
 604           break;
 605
 606         case OPTION_GDWARF2:
 607           debug_type = DEBUG_DWARF2;
 608           break;
 609
 610         case 'J':
 611           flag_signed_overflow_ok = 1;
 612           break;
 613
 614 #ifndef WORKING_DOT_WORD
 615         case 'K':
 616           flag_warn_displacement = 1;
 617           break;
 618 #endif
 619
 620         case 'L':
 621           flag_keep_locals = 1;
 622           break;
 623
 624         case OPTION_LISTING_LHS_WIDTH:
 625           listing_lhs_width = atoi(optarg);
 626           if (listing_lhs_width_second < listing_lhs_width)
 627             listing_lhs_width_second = listing_lhs_width;
 628           break;
 629         case OPTION_LISTING_LHS_WIDTH2:
 630           {
 631             int tmp = atoi(optarg);
 632             if (tmp > listing_lhs_width)
 633               listing_lhs_width_second = tmp;
 634           }
 635           break;
 636         case OPTION_LISTING_RHS_WIDTH:
 637           listing_rhs_width = atoi(optarg);
 638           break;
 639         case OPTION_LISTING_CONT_LINES:
 640           listing_lhs_cont_lines = atoi(optarg);
 641           break;
 642
 643         case 'M':
 644           flag_mri = 1;
 645 #ifdef TC_M68K
 646           flag_m68k_mri = 1;
 647 #endif
 648           break;
 649
 650         case 'R':
 651           flag_readonly_data_in_text = 1;
 652           break;
 653
 654         case 'W':
 655           flag_no_warnings = 1;
 656           break;
 657
 658         case OPTION_WARN:
 659           flag_no_warnings = 0;
 660           flag_fatal_warnings = 0;
 661           break;
 662
 663         case OPTION_WARN_FATAL:
 664           flag_no_warnings = 0;
 665           flag_fatal_warnings = 1;
 666           break;
 667
 668         case 'Z':
 669           flag_always_generate_output = 1;
 670           break;
 671
 672         case 'a':
 673           if (optarg)
 674             {
 675               while (*optarg)
 676                 {
 677                   switch (*optarg)
 678                     {
 679                     case 'c':
 680                       listing |= LISTING_NOCOND;
 681                       break;
 682                     case 'd':
 683                       listing |= LISTING_NODEBUG;
 684                       break;
 685                     case 'h':
 686                       listing |= LISTING_HLL;
 687                       break;
 688                     case 'l':
 689                       listing |= LISTING_LISTING;
 690                       break;
 691                     case 'm':
 692                       listing |= LISTING_MACEXP;
 693                       break;
 694                     case 'n':
 695                       listing |= LISTING_NOFORM;
 696                       break;
 697                     case 's':
 698                       listing |= LISTING_SYMBOLS;
 699                       break;
 700                     case '=':
 701                       listing_filename = xstrdup (optarg + 1);
 702                       optarg += strlen (listing_filename);
 703                       break;
 704                     default:
 705                       as_fatal (_("invalid listing option `%c'"), *optarg);
 706                       break;
 707                     }
 708                   optarg++;
 709                 }
 710             }
 711           if (!listing)
 712             listing = LISTING_DEFAULT;
 713           break;
 714
 715         case 'D':
 716           /* DEBUG is implemented: it debugs different */
 717           /* things from other people's assemblers. */
 718           flag_debug = 1;
 719           break;
 720
 721         case 'f':
 722           flag_no_comments = 1;
 723           break;
 724
 725         case 'I':
 726           {                     /* Include file directory */
 727             char *temp = xstrdup (optarg);
 728             add_include_dir (temp);
 729             break;
 730           }
 731
 732         case 'o':
 733           out_file_name = xstrdup (optarg);
 734           break;
 735
 736         case 'w':
 737           break;
 738
 739         case 'X':
 740           /* -X means treat warnings as errors */
 741           break;
 742         }
 743     }
 744
 745   free (shortopts);
 746   free (longopts);
 747
 748   *pargc = new_argc;
 749   *pargv = new_argv;
 750 }
 751
 752 static long start_time;
 753
 754 int
 755 main (argc, argv)
 756      int argc;
 757      char **argv;
 758 {
 759   int macro_alternate;
 760   int macro_strip_at;
 761   int keep_it;
 762
 763   start_time = get_run_time ();
 764
 765 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
 766   setlocale (LC_MESSAGES, "");
 767 #endif
 768   bindtextdomain (PACKAGE, LOCALEDIR);
 769   textdomain (PACKAGE);
 770
 771   if (debug_memory)
 772     {
 773 #ifdef BFD_ASSEMBLER
 774       extern long _bfd_chunksize;
 775       _bfd_chunksize = 64;
 776 #endif
 777       chunksize = 64;
 778     }
 779
 780 #ifdef HOST_SPECIAL_INIT
 781   HOST_SPECIAL_INIT (argc, argv);
 782 #endif
 783
 784   myname = argv[0];
 785   xmalloc_set_program_name (myname);
 786
 787   START_PROGRESS (myname, 0);
 788
 789 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
 790 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
 791 #endif
 792
 793   out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
 794
 795   hex_init ();
 796 #ifdef BFD_ASSEMBLER
 797   bfd_init ();
 798   bfd_set_error_program_name (myname);
 799 #endif
 800
 801 #ifdef USE_EMULATIONS
 802   select_emulation_mode (argc, argv);
 803 #endif
 804
 805   PROGRESS (1);
 806   symbol_begin ();
 807   frag_init ();
 808   subsegs_begin ();
 809   parse_args (&argc, &argv);
 810   read_begin ();
 811   input_scrub_begin ();
 812   expr_begin ();
 813
 814   if (flag_print_statistics)
 815     xatexit (dump_statistics);
 816
 817   macro_alternate = 0;
 818   macro_strip_at = 0;
 819 #ifdef TC_I960
 820   macro_strip_at = flag_mri;
 821 #endif
 822 #ifdef TC_A29K
 823   /* For compatibility with the AMD 29K family macro assembler
 824      specification.  */
 825   macro_alternate = 1;
 826   macro_strip_at = 1;
 827 #endif
 828
 829   macro_init (macro_alternate, flag_mri, macro_strip_at, macro_expr);
 830
 831   PROGRESS (1);
 832
 833 #ifdef BFD_ASSEMBLER
 834   output_file_create (out_file_name);
 835   assert (stdoutput != 0);
 836 #endif
 837
 838 #ifdef tc_init_after_args
 839   tc_init_after_args ();
 840 #endif
 841
 842   itbl_init ();
 843
 844   /* Now that we have fully initialized, and have created the output
 845      file, define any symbols requested by --defsym command line
 846      arguments.  */
 847   while (defsyms != NULL)
 848     {
 849       symbolS *sym;
 850       struct defsym_list *next;
 851
 852       sym = symbol_new (defsyms->name, absolute_section, defsyms->value,
 853                         &zero_address_frag);
 854       symbol_table_insert (sym);
 855       next = defsyms->next;
 856       free (defsyms);
 857       defsyms = next;
 858     }
 859
 860   PROGRESS (1);
 861
 862   perform_an_assembly_pass (argc, argv);        /* Assemble it. */
 863
 864   cond_finish_check (-1);
 865
 866 #ifdef md_end
 867   md_end ();
 868 #endif
 869
 870   if (seen_at_least_1_file ()
 871       && (flag_always_generate_output || had_errors () == 0))
 872     keep_it = 1;
 873   else
 874     keep_it = 0;
 875
 876 #if defined (BFD_ASSEMBLER) || !defined (BFD)
 877   /* This used to be done at the start of write_object_file in
 878      write.c, but that caused problems when doing listings when
 879      keep_it was zero.  This could probably be moved above md_end, but
 880      I didn't want to risk the change.  */
 881   subsegs_finish ();
 882 #endif
 883
 884   if (keep_it)
 885     write_object_file ();
 886
 887 #ifndef NO_LISTING
 888   listing_print (listing_filename);
 889 #endif
 890
 891 #ifndef OBJ_VMS /* does its own file handling */
 892 #ifndef BFD_ASSEMBLER
 893   if (keep_it)
 894 #endif
 895     output_file_close (out_file_name);
 896 #endif
 897
 898   if (flag_fatal_warnings && had_warnings() > 0 && had_errors () == 0)
 899     as_bad (_("%d warnings, treating warnings as errors"), had_warnings());
 900
 901   if (had_errors () > 0 && ! flag_always_generate_output)
 902     keep_it = 0;
 903
 904   if (!keep_it)
 905     unlink (out_file_name);
 906
 907   input_scrub_end ();
 908
 909   END_PROGRESS (myname);
 910
 911   /* Use xexit instead of return, because under VMS environments they
 912      may not place the same interpretation on the value given.  */
 913   if (had_errors () > 0)
 914     xexit (EXIT_FAILURE);
 915
 916   /* Only generate dependency file if assembler was successful.  */
 917   print_dependencies ();
 918
 919   xexit (EXIT_SUCCESS);
 920 }
 921
 922 static void
 923 dump_statistics ()
 924 {
 925 #ifdef HAVE_SBRK
 926   char *lim = (char *) sbrk (0);
 927 #endif
 928   long run_time = get_run_time () - start_time;
 929
 930   fprintf (stderr, _("%s: total time in assembly: %ld.%06ld\n"),
 931            myname, run_time / 1000000, run_time % 1000000);
 932 #ifdef HAVE_SBRK
 933   fprintf (stderr, _("%s: data size %ld\n"),
 934            myname, (long) (lim - (char *) &environ));
 935 #endif
 936
 937   subsegs_print_statistics (stderr);
 938   write_print_statistics (stderr);
 939   symbol_print_statistics (stderr);
 940   read_print_statistics (stderr);
 941
 942 #ifdef tc_print_statistics
 943   tc_print_statistics (stderr);
 944 #endif
 945 #ifdef obj_print_statistics
 946   obj_print_statistics (stderr);
 947 #endif
 948 }
 949 \f
 950
 951 /*                      perform_an_assembly_pass()
 952  *
 953  * Here to attempt 1 pass over each input file.
 954  * We scan argv[*] looking for filenames or exactly "" which is
 955  * shorthand for stdin. Any argv that is NULL is not a file-name.
 956  * We set need_pass_2 TRUE if, after this, we still have unresolved
 957  * expressions of the form (unknown value)+-(unknown value).
 958  *
 959  * Note the un*x semantics: there is only 1 logical input file, but it
 960  * may be a catenation of many 'physical' input files.
 961  */
 962 static void
 963 perform_an_assembly_pass (argc, argv)
 964      int argc;
 965      char **argv;
 966 {
 967   int saw_a_file = 0;
 968 #ifdef BFD_ASSEMBLER
 969   flagword applicable;
 970 #endif
 971
 972   need_pass_2 = 0;
 973
 974 #ifndef BFD_ASSEMBLER
 975 #ifdef MANY_SEGMENTS
 976   {
 977     unsigned int i;
 978     for (i = SEG_E0; i < SEG_UNKNOWN; i++)
 979       segment_info[i].fix_root = 0;
 980   }
 981   /* Create the three fixed ones */
 982   {
 983     segT seg;
 984
 985 #ifdef TE_APOLLO
 986     seg = subseg_new (".wtext", 0);
 987 #else
 988     seg = subseg_new (".text", 0);
 989 #endif
 990     assert (seg == SEG_E0);
 991     seg = subseg_new (".data", 0);
 992     assert (seg == SEG_E1);
 993     seg = subseg_new (".bss", 0);
 994     assert (seg == SEG_E2);
 995 #ifdef TE_APOLLO
 996     create_target_segments ();
 997 #endif
 998   }
 999
1000 #else /* not MANY_SEGMENTS */
1001   text_fix_root = NULL;
1002   data_fix_root = NULL;
1003   bss_fix_root = NULL;
1004 #endif /* not MANY_SEGMENTS */
1005 #else /* BFD_ASSEMBLER */
1006   /* Create the standard sections, and those the assembler uses
1007      internally.  */
1008   text_section = subseg_new (TEXT_SECTION_NAME, 0);
1009   data_section = subseg_new (DATA_SECTION_NAME, 0);
1010   bss_section = subseg_new (BSS_SECTION_NAME, 0);
1011   /* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
1012      to have relocs, otherwise we don't find out in time. */
1013   applicable = bfd_applicable_section_flags (stdoutput);
1014   bfd_set_section_flags (stdoutput, text_section,
1015                          applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1016                                        | SEC_CODE | SEC_READONLY));
1017   bfd_set_section_flags (stdoutput, data_section,
1018                          applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1019                                        | SEC_DATA));
1020   bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
1021   seg_info (bss_section)->bss = 1;
1022   subseg_new (BFD_ABS_SECTION_NAME, 0);
1023   subseg_new (BFD_UND_SECTION_NAME, 0);
1024   reg_section = subseg_new ("*GAS `reg' section*", 0);
1025   expr_section = subseg_new ("*GAS `expr' section*", 0);
1026
1027 #endif /* BFD_ASSEMBLER */
1028
1029   subseg_set (text_section, 0);
1030
1031   /* This may add symbol table entries, which requires having an open BFD,
1032      and sections already created, in BFD_ASSEMBLER mode.  */
1033   md_begin ();
1034
1035 #ifdef obj_begin
1036   obj_begin ();
1037 #endif
1038
1039   argv++;                       /* skip argv[0] */
1040   argc--;                       /* skip argv[0] */
1041   while (argc--)
1042     {
1043       if (*argv)
1044         {                       /* Is it a file-name argument? */
1045           PROGRESS (1);
1046           saw_a_file++;
1047           /* argv->"" if stdin desired, else->filename */
1048           read_a_source_file (*argv);
1049         }
1050       argv++;                   /* completed that argv */
1051     }
1052   if (!saw_a_file)
1053     read_a_source_file ("");
1054 }                               /* perform_an_assembly_pass() */
1055
1056 /* The interface between the macro code and gas expression handling.  */
1057
1058 static int
1059 macro_expr (emsg, idx, in, val)
1060      const char *emsg;
1061      int idx;
1062      sb *in;
1063      int *val;
1064 {
1065   char *hold;
1066   expressionS ex;
1067
1068   sb_terminate (in);
1069
1070   hold = input_line_pointer;
1071   input_line_pointer = in->ptr + idx;
1072   expression (&ex);
1073   idx = input_line_pointer - in->ptr;
1074   input_line_pointer = hold;
1075
1076   if (ex.X_op != O_constant)
1077     as_bad ("%s", emsg);
1078
1079   *val = (int) ex.X_add_number;
1080
1081   return idx;
1082 }
1083
1084 /* end of as.c */