gas/as.c

   1 /* as.c - GAS main program.
   2    Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   3    1999, 2000, 2001
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GAS, the GNU Assembler.
   7
   8    GAS is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2, or (at your option)
  11    any later version.
  12
  13    GAS is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GAS; see the file COPYING.  If not, write to the Free
  20    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  21    02111-1307, USA.  */
  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  *                      bugs
  29  *
  30  * : initialisers
  31  *      Since no-one else says they will support them in future: I
  32  * don't support them now.
  33  */
  34
  35 #include "ansidecl.h"
  36
  37 #define COMMON
  38
  39 #include "as.h"
  40 #include "subsegs.h"
  41 #include "output-file.h"
  42 #include "sb.h"
  43 #include "macro.h"
  44 #include "dwarf2dbg.h"
  45
  46 #ifdef HAVE_ITBL_CPU
  47 #include "itbl-ops.h"
  48 #else
  49 #define itbl_parse(itbl_file) 1
  50 #define itbl_init()
  51 #endif
  52
  53 #ifdef HAVE_SBRK
  54 #ifdef NEED_DECLARATION_SBRK
  55 extern PTR sbrk ();
  56 #endif
  57 #endif
  58
  59 static void show_usage PARAMS ((FILE *));
  60 static void parse_args PARAMS ((int *, char ***));
  61 static void dump_statistics PARAMS ((void));
  62 static void perform_an_assembly_pass PARAMS ((int argc, char **argv));
  63 static int macro_expr PARAMS ((const char *, int, sb *, int *));
  64
  65 /* True if a listing is wanted.  */
  66 int listing;
  67
  68 /* Name of listing file.  */
  69 static char *listing_filename = NULL;
  70
  71 /* Type of debugging to generate.  */
  72
  73 enum debug_info_type debug_type = DEBUG_UNSPECIFIED;
  74
  75 /* Maximum level of macro nesting.  */
  76 int max_macro_nest = 100;
  77
  78 /* argv[0]  */
  79 char *myname;
  80 #ifdef BFD_ASSEMBLER
  81 segT reg_section, expr_section;
  82 segT text_section, data_section, bss_section;
  83 #endif
  84
  85 /* The default obstack chunk size.  If we set this to zero, the
  86    obstack code will use whatever will fit in a 4096 byte block.  */
  87 int chunksize = 0;
  88
  89 /* To monitor memory allocation more effectively, make this non-zero.
  90    Then the chunk sizes for gas and bfd will be reduced.  */
  91 int debug_memory = 0;
  92
  93 /* We build a list of defsyms as we read the options, and then define
  94    them after we have initialized everything.  */
  95
  96 struct defsym_list {
  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   struct itbl_file_list *next;
 108   char *name;
 109 };
 110
 111 static struct itbl_file_list *itbl_files;
 112 \f
 113 #ifdef USE_EMULATIONS
 114 #define EMULATION_ENVIRON "AS_EMULATION"
 115
 116 extern struct emulation mipsbelf, mipslelf, mipself;
 117 extern struct emulation mipsbecoff, mipslecoff, mipsecoff;
 118 extern struct emulation i386coff, i386elf, i386aout;
 119 extern struct emulation crisaout, criself;
 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                           =FILE  list to FILE (must be last sub-option)\n"));
 236
 237   fprintf (stream, _("\
 238   -D                      produce assembler debugging messages\n"));
 239   fprintf (stream, _("\
 240   --defsym SYM=VAL        define symbol SYM to given value\n"));
 241 #ifdef USE_EMULATIONS
 242   {
 243     int i;
 244     char *def_em;
 245
 246     fprintf (stream, "\
 247   --em=[");
 248     for (i = 0; i < n_emulations - 1; i++)
 249       fprintf (stream, "%s | ", emulations[i]->name);
 250     fprintf (stream, "%s]\n", emulations[i]->name);
 251
 252     def_em = getenv (EMULATION_ENVIRON);
 253     if (!def_em)
 254       def_em = DEFAULT_EMULATION;
 255     fprintf (stream, _("\
 256                           emulate output (default %s)\n"), def_em);
 257   }
 258 #endif
 259   fprintf (stream, _("\
 260   -f                      skip whitespace and comment preprocessing\n"));
 261   fprintf (stream, _("\
 262   --gstabs                generate stabs debugging information\n"));
 263   fprintf (stream, _("\
 264   --gdwarf2               generate DWARF2 debugging information\n"));
 265   fprintf (stream, _("\
 266   --help                  show this message and exit\n"));
 267   fprintf (stream, _("\
 268   --target-help           show target specific options\n"));
 269   fprintf (stream, _("\
 270   -I DIR                  add DIR to search list for .include directives\n"));
 271   fprintf (stream, _("\
 272   -J                      don't warn about signed overflow\n"));
 273   fprintf (stream, _("\
 274   -K                      warn when differences altered for long displacements\n"));
 275   fprintf (stream, _("\
 276   -L,--keep-locals        keep local symbols (e.g. starting with `L')\n"));
 277   fprintf (stream, _("\
 278   -M,--mri                assemble in MRI compatibility mode\n"));
 279   fprintf (stream, _("\
 280   --MD FILE               write dependency information in FILE (default none)\n"));
 281   fprintf (stream, _("\
 282   -nocpp                  ignored\n"));
 283   fprintf (stream, _("\
 284   -o OBJFILE              name the object-file output OBJFILE (default a.out)\n"));
 285   fprintf (stream, _("\
 286   -R                      fold data section into text section\n"));
 287   fprintf (stream, _("\
 288   --statistics            print various measured statistics from execution\n"));
 289   fprintf (stream, _("\
 290   --strip-local-absolute  strip local absolute symbols\n"));
 291   fprintf (stream, _("\
 292   --traditional-format    Use same format as native assembler when possible\n"));
 293   fprintf (stream, _("\
 294   --version               print assembler version number and exit\n"));
 295   fprintf (stream, _("\
 296   -W  --no-warn           suppress warnings\n"));
 297   fprintf (stream, _("\
 298   --warn                  don't suppress warnings\n"));
 299   fprintf (stream, _("\
 300   --fatal-warnings        treat warnings as errors\n"));
 301   fprintf (stream, _("\
 302   --itbl INSTTBL          extend instruction set to include instructions\n\
 303                           matching the specifications defined in file INSTTBL\n"));
 304   fprintf (stream, _("\
 305   -w                      ignored\n"));
 306   fprintf (stream, _("\
 307   -X                      ignored\n"));
 308   fprintf (stream, _("\
 309   -Z                      generate object file even after errors\n"));
 310   fprintf (stream, _("\
 311   --listing-lhs-width     set the width in words of the output data column of\n\
 312                           the listing\n"));
 313   fprintf (stream, _("\
 314   --listing-lhs-width2    set the width in words of the continuation lines\n\
 315                           of the output data column; ignored if smaller than\n\
 316                           the width of the first line\n"));
 317   fprintf (stream, _("\
 318   --listing-rhs-width     set the max width in characters of the lines from\n\
 319                           the source file\n"));
 320   fprintf (stream, _("\
 321   --listing-cont-lines    set the maximum number of continuation lines used\n\
 322                           for the output data column of the listing\n"));
 323
 324   md_show_usage (stream);
 325
 326   fputc ('\n', stream);
 327   fprintf (stream, _("Report bugs to %s\n"), REPORT_BUGS_TO);
 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 static void
 340 parse_args (pargc, pargv)
 341      int *pargc;
 342      char ***pargv;
 343 {
 344   int old_argc, new_argc;
 345   char **old_argv, **new_argv;
 346
 347   /* Starting the short option string with '-' is for programs that
 348      expect options and other ARGV-elements in any order and that care about
 349      the ordering of the two.  We describe each non-option ARGV-element
 350      as if it were the argument of an option with character code 1.  */
 351
 352   char *shortopts;
 353   extern CONST char *md_shortopts;
 354   static const char std_shortopts[] = {
 355     '-', 'J',
 356 #ifndef WORKING_DOT_WORD
 357     /* -K is not meaningful if .word is not being hacked.  */
 358     'K',
 359 #endif
 360     'L', 'M', 'R', 'W', 'Z', 'f', 'a', ':', ':', 'D', 'I', ':', 'o', ':',
 361 #ifndef VMS
 362     /* -v takes an argument on VMS, so we don't make it a generic
 363        option.  */
 364     'v',
 365 #endif
 366     'w', 'X',
 367     /* New option for extending instruction set (see also --itbl below)  */
 368     't', ':',
 369     '\0'
 370   };
 371   struct option *longopts;
 372   extern struct option md_longopts[];
 373   extern size_t md_longopts_size;
 374   static const struct option std_longopts[] = {
 375 #define OPTION_HELP (OPTION_STD_BASE)
 376     {"help", no_argument, NULL, OPTION_HELP},
 377     {"keep-locals", no_argument, NULL, 'L'},
 378     {"mri", no_argument, NULL, 'M'},
 379 #define OPTION_NOCPP (OPTION_STD_BASE + 1)
 380     {"nocpp", no_argument, NULL, OPTION_NOCPP},
 381 #define OPTION_STATISTICS (OPTION_STD_BASE + 2)
 382     {"statistics", no_argument, NULL, OPTION_STATISTICS},
 383 #define OPTION_VERSION (OPTION_STD_BASE + 3)
 384     {"version", no_argument, NULL, OPTION_VERSION},
 385 #define OPTION_DUMPCONFIG (OPTION_STD_BASE + 4)
 386     {"dump-config", no_argument, NULL, OPTION_DUMPCONFIG},
 387 #define OPTION_VERBOSE (OPTION_STD_BASE + 5)
 388     {"verbose", no_argument, NULL, OPTION_VERBOSE},
 389 #define OPTION_EMULATION (OPTION_STD_BASE + 6)
 390     {"emulation", required_argument, NULL, OPTION_EMULATION},
 391 #define OPTION_DEFSYM (OPTION_STD_BASE + 7)
 392     {"defsym", required_argument, NULL, OPTION_DEFSYM},
 393 #define OPTION_INSTTBL (OPTION_STD_BASE + 8)
 394     /* New option for extending instruction set (see also -t above).
 395        The "-t file" or "--itbl file" option extends the basic set of
 396        valid instructions by reading "file", a text file containing a
 397        list of instruction formats.  The additional opcodes and their
 398        formats are added to the built-in set of instructions, and
 399        mnemonics for new registers may also be defined.  */
 400     {"itbl", required_argument, NULL, OPTION_INSTTBL},
 401 #define OPTION_LISTING_LHS_WIDTH (OPTION_STD_BASE + 9)
 402     {"listing-lhs-width", required_argument, NULL, OPTION_LISTING_LHS_WIDTH},
 403 #define OPTION_LISTING_LHS_WIDTH2 (OPTION_STD_BASE + 10)
 404     {"listing-lhs-width2", required_argument, NULL, OPTION_LISTING_LHS_WIDTH2},
 405 #define OPTION_LISTING_RHS_WIDTH (OPTION_STD_BASE + 11)
 406     {"listing-rhs-width", required_argument, NULL, OPTION_LISTING_RHS_WIDTH},
 407 #define OPTION_LISTING_CONT_LINES (OPTION_STD_BASE + 12)
 408     {"listing-cont-lines", required_argument, NULL, OPTION_LISTING_CONT_LINES},
 409 #define OPTION_DEPFILE (OPTION_STD_BASE + 13)
 410     {"MD", required_argument, NULL, OPTION_DEPFILE},
 411 #define OPTION_GSTABS (OPTION_STD_BASE + 14)
 412     {"gstabs", no_argument, NULL, OPTION_GSTABS},
 413 #define OPTION_STRIP_LOCAL_ABSOLUTE (OPTION_STD_BASE + 15)
 414     {"strip-local-absolute", no_argument, NULL, OPTION_STRIP_LOCAL_ABSOLUTE},
 415 #define OPTION_TRADITIONAL_FORMAT (OPTION_STD_BASE + 16)
 416     {"traditional-format", no_argument, NULL, OPTION_TRADITIONAL_FORMAT},
 417 #define OPTION_GDWARF2 (OPTION_STD_BASE + 17)
 418     {"gdwarf2", no_argument, NULL, OPTION_GDWARF2},
 419     {"no-warn", no_argument, NULL, 'W'},
 420 #define OPTION_WARN (OPTION_STD_BASE + 18)
 421     {"warn", no_argument, NULL, OPTION_WARN},
 422 #define OPTION_TARGET_HELP (OPTION_STD_BASE + 19)
 423     {"target-help", no_argument, NULL, OPTION_TARGET_HELP},
 424 #define OPTION_WARN_FATAL (OPTION_STD_BASE + 20)
 425     {"fatal-warnings", no_argument, NULL, OPTION_WARN_FATAL}
 426     /* When you add options here, check that they do not collide with
 427        OPTION_MD_BASE.  See as.h.  */
 428   };
 429
 430   /* Construct the option lists from the standard list and the target
 431      dependent list.  Include space for an extra NULL option and
 432      always NULL terminate.  */
 433   shortopts = concat (std_shortopts, md_shortopts, (char *) NULL);
 434   longopts = (struct option *) xmalloc (sizeof (std_longopts)
 435                                         + md_longopts_size
 436                                         + sizeof (struct option));
 437   memcpy (longopts, std_longopts, sizeof (std_longopts));
 438   memcpy ((char *) longopts + sizeof (std_longopts),
 439           md_longopts, md_longopts_size);
 440   memset ((char *) longopts + sizeof (std_longopts) + md_longopts_size,
 441           0, sizeof (struct option));
 442
 443   /* Make a local copy of the old argv.  */
 444   old_argc = *pargc;
 445   old_argv = *pargv;
 446
 447   /* Initialize a new argv that contains no options.  */
 448   new_argv = (char **) xmalloc (sizeof (char *) * (old_argc + 1));
 449   new_argv[0] = old_argv[0];
 450   new_argc = 1;
 451   new_argv[new_argc] = NULL;
 452
 453   while (1)
 454     {
 455       /* getopt_long_only is like getopt_long, but '-' as well as '--' can
 456          indicate a long option.  */
 457       int longind;
 458       int optc = getopt_long_only (old_argc, old_argv, shortopts, longopts,
 459                                    &longind);
 460
 461       if (optc == -1)
 462         break;
 463
 464       switch (optc)
 465         {
 466         default:
 467           /* md_parse_option should return 1 if it recognizes optc,
 468              0 if not.  */
 469           if (md_parse_option (optc, optarg) != 0)
 470             break;
 471           /* `-v' isn't included in the general short_opts list, so check for
 472              it explicity here before deciding we've gotten a bad argument.  */
 473           if (optc == 'v')
 474             {
 475 #ifdef VMS
 476               /* Telling getopt to treat -v's value as optional can result
 477                  in it picking up a following filename argument here.  The
 478                  VMS code in md_parse_option can return 0 in that case,
 479                  but it has no way of pushing the filename argument back.  */
 480               if (optarg && *optarg)
 481                 new_argv[new_argc++] = optarg, new_argv[new_argc] = NULL;
 482               else
 483 #else
 484               case 'v':
 485 #endif
 486               case OPTION_VERBOSE:
 487                 print_version_id ();
 488               break;
 489             }
 490           /* Fall through.  */
 491
 492         case '?':
 493           exit (EXIT_FAILURE);
 494
 495         case 1:                 /* File name.  */
 496           if (!strcmp (optarg, "-"))
 497             optarg = "";
 498           new_argv[new_argc++] = optarg;
 499           new_argv[new_argc] = NULL;
 500           break;
 501
 502         case OPTION_TARGET_HELP:
 503           md_show_usage (stdout);
 504           exit (EXIT_SUCCESS);
 505
 506         case OPTION_HELP:
 507           show_usage (stdout);
 508           exit (EXIT_SUCCESS);
 509
 510         case OPTION_NOCPP:
 511           break;
 512
 513         case OPTION_STATISTICS:
 514           flag_print_statistics = 1;
 515           break;
 516
 517         case OPTION_STRIP_LOCAL_ABSOLUTE:
 518           flag_strip_local_absolute = 1;
 519           break;
 520
 521         case OPTION_TRADITIONAL_FORMAT:
 522           flag_traditional_format = 1;
 523           break;
 524
 525         case OPTION_VERSION:
 526           /* This output is intended to follow the GNU standards document.  */
 527           printf (_("GNU assembler %s\n"), VERSION);
 528           printf (_("Copyright 2001 Free Software Foundation, Inc.\n"));
 529           printf (_("\
 530 This program is free software; you may redistribute it under the terms of\n\
 531 the GNU General Public License.  This program has absolutely no warranty.\n"));
 532           printf (_("This assembler was configured for a target of `%s'.\n"),
 533                   TARGET_ALIAS);
 534           exit (EXIT_SUCCESS);
 535
 536         case OPTION_EMULATION:
 537 #ifdef USE_EMULATIONS
 538           if (strcmp (optarg, this_emulation->name))
 539             as_fatal (_("multiple emulation names specified"));
 540 #else
 541           as_fatal (_("emulations not handled in this configuration"));
 542 #endif
 543           break;
 544
 545         case OPTION_DUMPCONFIG:
 546           fprintf (stderr, _("alias = %s\n"), TARGET_ALIAS);
 547           fprintf (stderr, _("canonical = %s\n"), TARGET_CANONICAL);
 548           fprintf (stderr, _("cpu-type = %s\n"), TARGET_CPU);
 549 #ifdef TARGET_OBJ_FORMAT
 550           fprintf (stderr, _("format = %s\n"), TARGET_OBJ_FORMAT);
 551 #endif
 552 #ifdef TARGET_FORMAT
 553           fprintf (stderr, _("bfd-target = %s\n"), TARGET_FORMAT);
 554 #endif
 555           exit (EXIT_SUCCESS);
 556
 557         case OPTION_DEFSYM:
 558           {
 559             char *s;
 560             valueT i;
 561             struct defsym_list *n;
 562
 563             for (s = optarg; *s != '\0' && *s != '='; s++)
 564               ;
 565             if (*s == '\0')
 566               as_fatal (_("bad defsym; format is --defsym name=value"));
 567             *s++ = '\0';
 568 #ifdef BFD_ASSEMBLER
 569             i = bfd_scan_vma (s, (const char **) NULL, 0);
 570 #else
 571             i = strtol (s, (char **) NULL, 0);
 572 #endif
 573             n = (struct defsym_list *) xmalloc (sizeof *n);
 574             n->next = defsyms;
 575             n->name = optarg;
 576             n->value = i;
 577             defsyms = n;
 578           }
 579           break;
 580
 581         case OPTION_INSTTBL:
 582         case 't':
 583           {
 584             /* optarg is the name of the file containing the instruction
 585                formats, opcodes, register names, etc.  */
 586             struct itbl_file_list *n;
 587
 588             if (optarg == NULL)
 589               {
 590                 as_warn (_("no file name following -t option"));
 591                 break;
 592               }
 593
 594             n = (struct itbl_file_list *) xmalloc (sizeof *n);
 595             n->next = itbl_files;
 596             n->name = optarg;
 597             itbl_files = n;
 598
 599             /* Parse the file and add the new instructions to our internal
 600                table.  If multiple instruction tables are specified, the
 601                information from this table gets appended onto the existing
 602                internal table.  */
 603             itbl_files->name = xstrdup (optarg);
 604             if (itbl_parse (itbl_files->name) != 0)
 605               as_fatal (_("failed to read instruction table %s\n"),
 606                         itbl_files->name);
 607           }
 608           break;
 609
 610         case OPTION_DEPFILE:
 611           start_dependencies (optarg);
 612           break;
 613
 614         case OPTION_GSTABS:
 615           debug_type = DEBUG_STABS;
 616           break;
 617
 618         case OPTION_GDWARF2:
 619           debug_type = DEBUG_DWARF2;
 620           break;
 621
 622         case 'J':
 623           flag_signed_overflow_ok = 1;
 624           break;
 625
 626 #ifndef WORKING_DOT_WORD
 627         case 'K':
 628           flag_warn_displacement = 1;
 629           break;
 630 #endif
 631
 632         case 'L':
 633           flag_keep_locals = 1;
 634           break;
 635
 636         case OPTION_LISTING_LHS_WIDTH:
 637           listing_lhs_width = atoi (optarg);
 638           if (listing_lhs_width_second < listing_lhs_width)
 639             listing_lhs_width_second = listing_lhs_width;
 640           break;
 641         case OPTION_LISTING_LHS_WIDTH2:
 642           {
 643             int tmp = atoi (optarg);
 644             if (tmp > listing_lhs_width)
 645               listing_lhs_width_second = tmp;
 646           }
 647           break;
 648         case OPTION_LISTING_RHS_WIDTH:
 649           listing_rhs_width = atoi (optarg);
 650           break;
 651         case OPTION_LISTING_CONT_LINES:
 652           listing_lhs_cont_lines = atoi (optarg);
 653           break;
 654
 655         case 'M':
 656           flag_mri = 1;
 657 #ifdef TC_M68K
 658           flag_m68k_mri = 1;
 659 #endif
 660           break;
 661
 662         case 'R':
 663           flag_readonly_data_in_text = 1;
 664           break;
 665
 666         case 'W':
 667           flag_no_warnings = 1;
 668           break;
 669
 670         case OPTION_WARN:
 671           flag_no_warnings = 0;
 672           flag_fatal_warnings = 0;
 673           break;
 674
 675         case OPTION_WARN_FATAL:
 676           flag_no_warnings = 0;
 677           flag_fatal_warnings = 1;
 678           break;
 679
 680         case 'Z':
 681           flag_always_generate_output = 1;
 682           break;
 683
 684         case 'a':
 685           if (optarg)
 686             {
 687               if (md_parse_option (optc, optarg) != 0)
 688                 break;
 689
 690               while (*optarg)
 691                 {
 692                   switch (*optarg)
 693                     {
 694                     case 'c':
 695                       listing |= LISTING_NOCOND;
 696                       break;
 697                     case 'd':
 698                       listing |= LISTING_NODEBUG;
 699                       break;
 700                     case 'h':
 701                       listing |= LISTING_HLL;
 702                       break;
 703                     case 'l':
 704                       listing |= LISTING_LISTING;
 705                       break;
 706                     case 'm':
 707                       listing |= LISTING_MACEXP;
 708                       break;
 709                     case 'n':
 710                       listing |= LISTING_NOFORM;
 711                       break;
 712                     case 's':
 713                       listing |= LISTING_SYMBOLS;
 714                       break;
 715                     case '=':
 716                       listing_filename = xstrdup (optarg + 1);
 717                       optarg += strlen (listing_filename);
 718                       break;
 719                     default:
 720                       as_fatal (_("invalid listing option `%c'"), *optarg);
 721                       break;
 722                     }
 723                   optarg++;
 724                 }
 725             }
 726           if (!listing)
 727             listing = LISTING_DEFAULT;
 728           break;
 729
 730         case 'D':
 731           /* DEBUG is implemented: it debugs different
 732              things from other people's assemblers.  */
 733           flag_debug = 1;
 734           break;
 735
 736         case 'f':
 737           flag_no_comments = 1;
 738           break;
 739
 740         case 'I':
 741           {                     /* Include file directory.  */
 742             char *temp = xstrdup (optarg);
 743             add_include_dir (temp);
 744             break;
 745           }
 746
 747         case 'o':
 748           out_file_name = xstrdup (optarg);
 749           break;
 750
 751         case 'w':
 752           break;
 753
 754         case 'X':
 755           /* -X means treat warnings as errors.  */
 756           break;
 757         }
 758     }
 759
 760   free (shortopts);
 761   free (longopts);
 762
 763   *pargc = new_argc;
 764   *pargv = new_argv;
 765 }
 766
 767 static long start_time;
 768
 769 int
 770 main (argc, argv)
 771      int argc;
 772      char **argv;
 773 {
 774   int macro_alternate;
 775   int macro_strip_at;
 776   int keep_it;
 777
 778   start_time = get_run_time ();
 779
 780 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
 781   setlocale (LC_MESSAGES, "");
 782 #endif
 783   bindtextdomain (PACKAGE, LOCALEDIR);
 784   textdomain (PACKAGE);
 785
 786   if (debug_memory)
 787     {
 788 #ifdef BFD_ASSEMBLER
 789       extern long _bfd_chunksize;
 790       _bfd_chunksize = 64;
 791 #endif
 792       chunksize = 64;
 793     }
 794
 795 #ifdef HOST_SPECIAL_INIT
 796   HOST_SPECIAL_INIT (argc, argv);
 797 #endif
 798
 799   myname = argv[0];
 800   xmalloc_set_program_name (myname);
 801
 802   START_PROGRESS (myname, 0);
 803
 804 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
 805 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
 806 #endif
 807
 808   out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
 809
 810   hex_init ();
 811 #ifdef BFD_ASSEMBLER
 812   bfd_init ();
 813   bfd_set_error_program_name (myname);
 814 #endif
 815
 816 #ifdef USE_EMULATIONS
 817   select_emulation_mode (argc, argv);
 818 #endif
 819
 820   PROGRESS (1);
 821   symbol_begin ();
 822   frag_init ();
 823   subsegs_begin ();
 824   parse_args (&argc, &argv);
 825   read_begin ();
 826   input_scrub_begin ();
 827   expr_begin ();
 828
 829   if (flag_print_statistics)
 830     xatexit (dump_statistics);
 831
 832   macro_alternate = 0;
 833   macro_strip_at = 0;
 834 #ifdef TC_I960
 835   macro_strip_at = flag_mri;
 836 #endif
 837 #ifdef TC_A29K
 838   /* For compatibility with the AMD 29K family macro assembler
 839      specification.  */
 840   macro_alternate = 1;
 841   macro_strip_at = 1;
 842 #endif
 843
 844   macro_init (macro_alternate, flag_mri, macro_strip_at, macro_expr);
 845
 846   PROGRESS (1);
 847
 848 #ifdef BFD_ASSEMBLER
 849   output_file_create (out_file_name);
 850   assert (stdoutput != 0);
 851 #endif
 852
 853 #ifdef tc_init_after_args
 854   tc_init_after_args ();
 855 #endif
 856
 857   itbl_init ();
 858
 859   /* Now that we have fully initialized, and have created the output
 860      file, define any symbols requested by --defsym command line
 861      arguments.  */
 862   while (defsyms != NULL)
 863     {
 864       symbolS *sym;
 865       struct defsym_list *next;
 866
 867       sym = symbol_new (defsyms->name, absolute_section, defsyms->value,
 868                         &zero_address_frag);
 869       symbol_table_insert (sym);
 870       next = defsyms->next;
 871       free (defsyms);
 872       defsyms = next;
 873     }
 874
 875   PROGRESS (1);
 876
 877   /* Assemble it.  */
 878   perform_an_assembly_pass (argc, argv);
 879
 880   cond_finish_check (-1);
 881
 882 #ifdef md_end
 883   md_end ();
 884 #endif
 885
 886   /* If we've been collecting dwarf2 .debug_line info, either for
 887      assembly debugging or on behalf of the compiler, emit it now.  */
 888   dwarf2_finish ();
 889
 890   if (seen_at_least_1_file ()
 891       && (flag_always_generate_output || had_errors () == 0))
 892     keep_it = 1;
 893   else
 894     keep_it = 0;
 895
 896 #if defined (BFD_ASSEMBLER) || !defined (BFD)
 897   /* This used to be done at the start of write_object_file in
 898      write.c, but that caused problems when doing listings when
 899      keep_it was zero.  This could probably be moved above md_end, but
 900      I didn't want to risk the change.  */
 901   subsegs_finish ();
 902 #endif
 903
 904   if (keep_it)
 905     write_object_file ();
 906
 907 #ifndef NO_LISTING
 908   listing_print (listing_filename);
 909 #endif
 910
 911 #ifndef OBJ_VMS /* does its own file handling */
 912 #ifndef BFD_ASSEMBLER
 913   if (keep_it)
 914 #endif
 915     output_file_close (out_file_name);
 916 #endif
 917
 918   if (flag_fatal_warnings && had_warnings () > 0 && had_errors () == 0)
 919     as_bad (_("%d warnings, treating warnings as errors"), had_warnings ());
 920
 921   if (had_errors () > 0 && ! flag_always_generate_output)
 922     keep_it = 0;
 923
 924   if (!keep_it)
 925     unlink (out_file_name);
 926
 927   input_scrub_end ();
 928
 929   END_PROGRESS (myname);
 930
 931   /* Use xexit instead of return, because under VMS environments they
 932      may not place the same interpretation on the value given.  */
 933   if (had_errors () > 0)
 934     xexit (EXIT_FAILURE);
 935
 936   /* Only generate dependency file if assembler was successful.  */
 937   print_dependencies ();
 938
 939   xexit (EXIT_SUCCESS);
 940 }
 941
 942 static void
 943 dump_statistics ()
 944 {
 945 #ifdef HAVE_SBRK
 946   char *lim = (char *) sbrk (0);
 947 #endif
 948   long run_time = get_run_time () - start_time;
 949
 950   fprintf (stderr, _("%s: total time in assembly: %ld.%06ld\n"),
 951            myname, run_time / 1000000, run_time % 1000000);
 952 #ifdef HAVE_SBRK
 953   fprintf (stderr, _("%s: data size %ld\n"),
 954            myname, (long) (lim - (char *) &environ));
 955 #endif
 956
 957   subsegs_print_statistics (stderr);
 958   write_print_statistics (stderr);
 959   symbol_print_statistics (stderr);
 960   read_print_statistics (stderr);
 961
 962 #ifdef tc_print_statistics
 963   tc_print_statistics (stderr);
 964 #endif
 965 #ifdef obj_print_statistics
 966   obj_print_statistics (stderr);
 967 #endif
 968 }
 969 \f
 970 /* Here to attempt 1 pass over each input file.
 971    We scan argv[*] looking for filenames or exactly "" which is
 972    shorthand for stdin. Any argv that is NULL is not a file-name.
 973    We set need_pass_2 TRUE if, after this, we still have unresolved
 974    expressions of the form (unknown value)+-(unknown value).
 975
 976    Note the un*x semantics: there is only 1 logical input file, but it
 977    may be a catenation of many 'physical' input files.  */
 978
 979 static void
 980 perform_an_assembly_pass (argc, argv)
 981      int argc;
 982      char **argv;
 983 {
 984   int saw_a_file = 0;
 985 #ifdef BFD_ASSEMBLER
 986   flagword applicable;
 987 #endif
 988
 989   need_pass_2 = 0;
 990
 991 #ifndef BFD_ASSEMBLER
 992 #ifdef MANY_SEGMENTS
 993   {
 994     unsigned int i;
 995     for (i = SEG_E0; i < SEG_UNKNOWN; i++)
 996       segment_info[i].fix_root = 0;
 997   }
 998   /* Create the three fixed ones.  */
 999   {
1000     segT seg;
1001
1002 #ifdef TE_APOLLO
1003     seg = subseg_new (".wtext", 0);
1004 #else
1005     seg = subseg_new (".text", 0);
1006 #endif
1007     assert (seg == SEG_E0);
1008     seg = subseg_new (".data", 0);
1009     assert (seg == SEG_E1);
1010     seg = subseg_new (".bss", 0);
1011     assert (seg == SEG_E2);
1012 #ifdef TE_APOLLO
1013     create_target_segments ();
1014 #endif
1015   }
1016
1017 #else /* not MANY_SEGMENTS */
1018   text_fix_root = NULL;
1019   data_fix_root = NULL;
1020   bss_fix_root = NULL;
1021 #endif /* not MANY_SEGMENTS */
1022 #else /* BFD_ASSEMBLER */
1023   /* Create the standard sections, and those the assembler uses
1024      internally.  */
1025   text_section = subseg_new (TEXT_SECTION_NAME, 0);
1026   data_section = subseg_new (DATA_SECTION_NAME, 0);
1027   bss_section = subseg_new (BSS_SECTION_NAME, 0);
1028   /* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
1029      to have relocs, otherwise we don't find out in time.  */
1030   applicable = bfd_applicable_section_flags (stdoutput);
1031   bfd_set_section_flags (stdoutput, text_section,
1032                          applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1033                                        | SEC_CODE | SEC_READONLY));
1034   bfd_set_section_flags (stdoutput, data_section,
1035                          applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1036                                        | SEC_DATA));
1037   bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
1038   seg_info (bss_section)->bss = 1;
1039   subseg_new (BFD_ABS_SECTION_NAME, 0);
1040   subseg_new (BFD_UND_SECTION_NAME, 0);
1041   reg_section = subseg_new ("*GAS `reg' section*", 0);
1042   expr_section = subseg_new ("*GAS `expr' section*", 0);
1043
1044 #endif /* BFD_ASSEMBLER */
1045
1046   subseg_set (text_section, 0);
1047
1048   /* This may add symbol table entries, which requires having an open BFD,
1049      and sections already created, in BFD_ASSEMBLER mode.  */
1050   md_begin ();
1051
1052 #ifdef obj_begin
1053   obj_begin ();
1054 #endif
1055
1056   /* Skip argv[0].  */
1057   argv++;
1058   argc--;
1059
1060   while (argc--)
1061     {
1062       if (*argv)
1063         {                       /* Is it a file-name argument?  */
1064           PROGRESS (1);
1065           saw_a_file++;
1066           /* argv->"" if stdin desired, else->filename  */
1067           read_a_source_file (*argv);
1068         }
1069       argv++;                   /* completed that argv  */
1070     }
1071   if (!saw_a_file)
1072     read_a_source_file ("");
1073 }
1074
1075 /* The interface between the macro code and gas expression handling.  */
1076
1077 static int
1078 macro_expr (emsg, idx, in, val)
1079      const char *emsg;
1080      int idx;
1081      sb *in;
1082      int *val;
1083 {
1084   char *hold;
1085   expressionS ex;
1086
1087   sb_terminate (in);
1088
1089   hold = input_line_pointer;
1090   input_line_pointer = in->ptr + idx;
1091   expression (&ex);
1092   idx = input_line_pointer - in->ptr;
1093   input_line_pointer = hold;
1094
1095   if (ex.X_op != O_constant)
1096     as_bad ("%s", emsg);
1097
1098   *val = (int) ex.X_add_number;
1099
1100   return idx;
1101 }