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 %s\n"), 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 2000 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             valueT 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 #ifdef BFD_ASSEMBLER
 558             i = bfd_scan_vma (s, (const char **) NULL, 0);
 559 #else
 560             i = strtol (s, (char **) NULL, 0);
 561 #endif
 562             n = (struct defsym_list *) xmalloc (sizeof *n);
 563             n->next = defsyms;
 564             n->name = optarg;
 565             n->value = i;
 566             defsyms = n;
 567           }
 568           break;
 569
 570         case OPTION_INSTTBL:
 571         case 't':
 572           {
 573             /* optarg is the name of the file containing the instruction
 574                formats, opcodes, register names, etc. */
 575             struct itbl_file_list *n;
 576
 577             if (optarg == NULL)
 578               {
 579                 as_warn ( _("No file name following -t option\n") );
 580                 break;
 581               }
 582
 583             n = (struct itbl_file_list *) xmalloc (sizeof *n);
 584             n->next = itbl_files;
 585             n->name = optarg;
 586             itbl_files = n;
 587
 588             /* Parse the file and add the new instructions to our internal
 589                table.  If multiple instruction tables are specified, the
 590                information from this table gets appended onto the existing
 591                internal table. */
 592             itbl_files->name = xstrdup (optarg);
 593             if (itbl_parse (itbl_files->name) != 0)
 594               {
 595                 fprintf (stderr, _("Failed to read instruction table %s\n"),
 596                          itbl_files->name);
 597                 exit (EXIT_SUCCESS);
 598               }
 599           }
 600           break;
 601
 602         case OPTION_DEPFILE:
 603           start_dependencies (optarg);
 604           break;
 605
 606         case OPTION_GSTABS:
 607           debug_type = DEBUG_STABS;
 608           break;
 609
 610         case OPTION_GDWARF2:
 611           debug_type = DEBUG_DWARF2;
 612           break;
 613
 614         case 'J':
 615           flag_signed_overflow_ok = 1;
 616           break;
 617
 618 #ifndef WORKING_DOT_WORD
 619         case 'K':
 620           flag_warn_displacement = 1;
 621           break;
 622 #endif
 623
 624         case 'L':
 625           flag_keep_locals = 1;
 626           break;
 627
 628         case OPTION_LISTING_LHS_WIDTH:
 629           listing_lhs_width = atoi(optarg);
 630           if (listing_lhs_width_second < listing_lhs_width)
 631             listing_lhs_width_second = listing_lhs_width;
 632           break;
 633         case OPTION_LISTING_LHS_WIDTH2:
 634           {
 635             int tmp = atoi(optarg);
 636             if (tmp > listing_lhs_width)
 637               listing_lhs_width_second = tmp;
 638           }
 639           break;
 640         case OPTION_LISTING_RHS_WIDTH:
 641           listing_rhs_width = atoi(optarg);
 642           break;
 643         case OPTION_LISTING_CONT_LINES:
 644           listing_lhs_cont_lines = atoi(optarg);
 645           break;
 646
 647         case 'M':
 648           flag_mri = 1;
 649 #ifdef TC_M68K
 650           flag_m68k_mri = 1;
 651 #endif
 652           break;
 653
 654         case 'R':
 655           flag_readonly_data_in_text = 1;
 656           break;
 657
 658         case 'W':
 659           flag_no_warnings = 1;
 660           break;
 661
 662         case OPTION_WARN:
 663           flag_no_warnings = 0;
 664           flag_fatal_warnings = 0;
 665           break;
 666
 667         case OPTION_WARN_FATAL:
 668           flag_no_warnings = 0;
 669           flag_fatal_warnings = 1;
 670           break;
 671
 672         case 'Z':
 673           flag_always_generate_output = 1;
 674           break;
 675
 676         case 'a':
 677           if (optarg)
 678             {
 679               if (md_parse_option (optc, optarg) != 0)
 680                 break;
 681
 682               while (*optarg)
 683                 {
 684                   switch (*optarg)
 685                     {
 686                     case 'c':
 687                       listing |= LISTING_NOCOND;
 688                       break;
 689                     case 'd':
 690                       listing |= LISTING_NODEBUG;
 691                       break;
 692                     case 'h':
 693                       listing |= LISTING_HLL;
 694                       break;
 695                     case 'l':
 696                       listing |= LISTING_LISTING;
 697                       break;
 698                     case 'm':
 699                       listing |= LISTING_MACEXP;
 700                       break;
 701                     case 'n':
 702                       listing |= LISTING_NOFORM;
 703                       break;
 704                     case 's':
 705                       listing |= LISTING_SYMBOLS;
 706                       break;
 707                     case '=':
 708                       listing_filename = xstrdup (optarg + 1);
 709                       optarg += strlen (listing_filename);
 710                       break;
 711                     default:
 712                       as_fatal (_("invalid listing option `%c'"), *optarg);
 713                       break;
 714                     }
 715                   optarg++;
 716                 }
 717             }
 718           if (!listing)
 719             listing = LISTING_DEFAULT;
 720           break;
 721
 722         case 'D':
 723           /* DEBUG is implemented: it debugs different */
 724           /* things from other people's assemblers. */
 725           flag_debug = 1;
 726           break;
 727
 728         case 'f':
 729           flag_no_comments = 1;
 730           break;
 731
 732         case 'I':
 733           {                     /* Include file directory */
 734             char *temp = xstrdup (optarg);
 735             add_include_dir (temp);
 736             break;
 737           }
 738
 739         case 'o':
 740           out_file_name = xstrdup (optarg);
 741           break;
 742
 743         case 'w':
 744           break;
 745
 746         case 'X':
 747           /* -X means treat warnings as errors */
 748           break;
 749         }
 750     }
 751
 752   free (shortopts);
 753   free (longopts);
 754
 755   *pargc = new_argc;
 756   *pargv = new_argv;
 757 }
 758
 759 static long start_time;
 760
 761 int
 762 main (argc, argv)
 763      int argc;
 764      char **argv;
 765 {
 766   int macro_alternate;
 767   int macro_strip_at;
 768   int keep_it;
 769
 770   start_time = get_run_time ();
 771
 772 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
 773   setlocale (LC_MESSAGES, "");
 774 #endif
 775   bindtextdomain (PACKAGE, LOCALEDIR);
 776   textdomain (PACKAGE);
 777
 778   if (debug_memory)
 779     {
 780 #ifdef BFD_ASSEMBLER
 781       extern long _bfd_chunksize;
 782       _bfd_chunksize = 64;
 783 #endif
 784       chunksize = 64;
 785     }
 786
 787 #ifdef HOST_SPECIAL_INIT
 788   HOST_SPECIAL_INIT (argc, argv);
 789 #endif
 790
 791   myname = argv[0];
 792   xmalloc_set_program_name (myname);
 793
 794   START_PROGRESS (myname, 0);
 795
 796 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
 797 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
 798 #endif
 799
 800   out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
 801
 802   hex_init ();
 803 #ifdef BFD_ASSEMBLER
 804   bfd_init ();
 805   bfd_set_error_program_name (myname);
 806 #endif
 807
 808 #ifdef USE_EMULATIONS
 809   select_emulation_mode (argc, argv);
 810 #endif
 811
 812   PROGRESS (1);
 813   symbol_begin ();
 814   frag_init ();
 815   subsegs_begin ();
 816   parse_args (&argc, &argv);
 817   read_begin ();
 818   input_scrub_begin ();
 819   expr_begin ();
 820
 821   if (flag_print_statistics)
 822     xatexit (dump_statistics);
 823
 824   macro_alternate = 0;
 825   macro_strip_at = 0;
 826 #ifdef TC_I960
 827   macro_strip_at = flag_mri;
 828 #endif
 829 #ifdef TC_A29K
 830   /* For compatibility with the AMD 29K family macro assembler
 831      specification.  */
 832   macro_alternate = 1;
 833   macro_strip_at = 1;
 834 #endif
 835
 836   macro_init (macro_alternate, flag_mri, macro_strip_at, macro_expr);
 837
 838   PROGRESS (1);
 839
 840 #ifdef BFD_ASSEMBLER
 841   output_file_create (out_file_name);
 842   assert (stdoutput != 0);
 843 #endif
 844
 845 #ifdef tc_init_after_args
 846   tc_init_after_args ();
 847 #endif
 848
 849   itbl_init ();
 850
 851   /* Now that we have fully initialized, and have created the output
 852      file, define any symbols requested by --defsym command line
 853      arguments.  */
 854   while (defsyms != NULL)
 855     {
 856       symbolS *sym;
 857       struct defsym_list *next;
 858
 859       sym = symbol_new (defsyms->name, absolute_section, defsyms->value,
 860                         &zero_address_frag);
 861       symbol_table_insert (sym);
 862       next = defsyms->next;
 863       free (defsyms);
 864       defsyms = next;
 865     }
 866
 867   PROGRESS (1);
 868
 869   perform_an_assembly_pass (argc, argv);        /* Assemble it. */
 870
 871   cond_finish_check (-1);
 872
 873 #ifdef md_end
 874   md_end ();
 875 #endif
 876
 877   if (seen_at_least_1_file ()
 878       && (flag_always_generate_output || had_errors () == 0))
 879     keep_it = 1;
 880   else
 881     keep_it = 0;
 882
 883 #if defined (BFD_ASSEMBLER) || !defined (BFD)
 884   /* This used to be done at the start of write_object_file in
 885      write.c, but that caused problems when doing listings when
 886      keep_it was zero.  This could probably be moved above md_end, but
 887      I didn't want to risk the change.  */
 888   subsegs_finish ();
 889 #endif
 890
 891   if (keep_it)
 892     write_object_file ();
 893
 894 #ifndef NO_LISTING
 895   listing_print (listing_filename);
 896 #endif
 897
 898 #ifndef OBJ_VMS /* does its own file handling */
 899 #ifndef BFD_ASSEMBLER
 900   if (keep_it)
 901 #endif
 902     output_file_close (out_file_name);
 903 #endif
 904
 905   if (flag_fatal_warnings && had_warnings() > 0 && had_errors () == 0)
 906     as_bad (_("%d warnings, treating warnings as errors"), had_warnings());
 907
 908   if (had_errors () > 0 && ! flag_always_generate_output)
 909     keep_it = 0;
 910
 911   if (!keep_it)
 912     unlink (out_file_name);
 913
 914   input_scrub_end ();
 915
 916   END_PROGRESS (myname);
 917
 918   /* Use xexit instead of return, because under VMS environments they
 919      may not place the same interpretation on the value given.  */
 920   if (had_errors () > 0)
 921     xexit (EXIT_FAILURE);
 922
 923   /* Only generate dependency file if assembler was successful.  */
 924   print_dependencies ();
 925
 926   xexit (EXIT_SUCCESS);
 927 }
 928
 929 static void
 930 dump_statistics ()
 931 {
 932 #ifdef HAVE_SBRK
 933   char *lim = (char *) sbrk (0);
 934 #endif
 935   long run_time = get_run_time () - start_time;
 936
 937   fprintf (stderr, _("%s: total time in assembly: %ld.%06ld\n"),
 938            myname, run_time / 1000000, run_time % 1000000);
 939 #ifdef HAVE_SBRK
 940   fprintf (stderr, _("%s: data size %ld\n"),
 941            myname, (long) (lim - (char *) &environ));
 942 #endif
 943
 944   subsegs_print_statistics (stderr);
 945   write_print_statistics (stderr);
 946   symbol_print_statistics (stderr);
 947   read_print_statistics (stderr);
 948
 949 #ifdef tc_print_statistics
 950   tc_print_statistics (stderr);
 951 #endif
 952 #ifdef obj_print_statistics
 953   obj_print_statistics (stderr);
 954 #endif
 955 }
 956 \f
 957
 958 /*                      perform_an_assembly_pass()
 959  *
 960  * Here to attempt 1 pass over each input file.
 961  * We scan argv[*] looking for filenames or exactly "" which is
 962  * shorthand for stdin. Any argv that is NULL is not a file-name.
 963  * We set need_pass_2 TRUE if, after this, we still have unresolved
 964  * expressions of the form (unknown value)+-(unknown value).
 965  *
 966  * Note the un*x semantics: there is only 1 logical input file, but it
 967  * may be a catenation of many 'physical' input files.
 968  */
 969 static void
 970 perform_an_assembly_pass (argc, argv)
 971      int argc;
 972      char **argv;
 973 {
 974   int saw_a_file = 0;
 975 #ifdef BFD_ASSEMBLER
 976   flagword applicable;
 977 #endif
 978
 979   need_pass_2 = 0;
 980
 981 #ifndef BFD_ASSEMBLER
 982 #ifdef MANY_SEGMENTS
 983   {
 984     unsigned int i;
 985     for (i = SEG_E0; i < SEG_UNKNOWN; i++)
 986       segment_info[i].fix_root = 0;
 987   }
 988   /* Create the three fixed ones */
 989   {
 990     segT seg;
 991
 992 #ifdef TE_APOLLO
 993     seg = subseg_new (".wtext", 0);
 994 #else
 995     seg = subseg_new (".text", 0);
 996 #endif
 997     assert (seg == SEG_E0);
 998     seg = subseg_new (".data", 0);
 999     assert (seg == SEG_E1);
1000     seg = subseg_new (".bss", 0);
1001     assert (seg == SEG_E2);
1002 #ifdef TE_APOLLO
1003     create_target_segments ();
1004 #endif
1005   }
1006
1007 #else /* not MANY_SEGMENTS */
1008   text_fix_root = NULL;
1009   data_fix_root = NULL;
1010   bss_fix_root = NULL;
1011 #endif /* not MANY_SEGMENTS */
1012 #else /* BFD_ASSEMBLER */
1013   /* Create the standard sections, and those the assembler uses
1014      internally.  */
1015   text_section = subseg_new (TEXT_SECTION_NAME, 0);
1016   data_section = subseg_new (DATA_SECTION_NAME, 0);
1017   bss_section = subseg_new (BSS_SECTION_NAME, 0);
1018   /* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
1019      to have relocs, otherwise we don't find out in time. */
1020   applicable = bfd_applicable_section_flags (stdoutput);
1021   bfd_set_section_flags (stdoutput, text_section,
1022                          applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1023                                        | SEC_CODE | SEC_READONLY));
1024   bfd_set_section_flags (stdoutput, data_section,
1025                          applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1026                                        | SEC_DATA));
1027   bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
1028   seg_info (bss_section)->bss = 1;
1029   subseg_new (BFD_ABS_SECTION_NAME, 0);
1030   subseg_new (BFD_UND_SECTION_NAME, 0);
1031   reg_section = subseg_new ("*GAS `reg' section*", 0);
1032   expr_section = subseg_new ("*GAS `expr' section*", 0);
1033
1034 #endif /* BFD_ASSEMBLER */
1035
1036   subseg_set (text_section, 0);
1037
1038   /* This may add symbol table entries, which requires having an open BFD,
1039      and sections already created, in BFD_ASSEMBLER mode.  */
1040   md_begin ();
1041
1042 #ifdef obj_begin
1043   obj_begin ();
1044 #endif
1045
1046   argv++;                       /* skip argv[0] */
1047   argc--;                       /* skip argv[0] */
1048   while (argc--)
1049     {
1050       if (*argv)
1051         {                       /* Is it a file-name argument? */
1052           PROGRESS (1);
1053           saw_a_file++;
1054           /* argv->"" if stdin desired, else->filename */
1055           read_a_source_file (*argv);
1056         }
1057       argv++;                   /* completed that argv */
1058     }
1059   if (!saw_a_file)
1060     read_a_source_file ("");
1061 }                               /* perform_an_assembly_pass() */
1062
1063 /* The interface between the macro code and gas expression handling.  */
1064
1065 static int
1066 macro_expr (emsg, idx, in, val)
1067      const char *emsg;
1068      int idx;
1069      sb *in;
1070      int *val;
1071 {
1072   char *hold;
1073   expressionS ex;
1074
1075   sb_terminate (in);
1076
1077   hold = input_line_pointer;
1078   input_line_pointer = in->ptr + idx;
1079   expression (&ex);
1080   idx = input_line_pointer - in->ptr;
1081   input_line_pointer = hold;
1082
1083   if (ex.X_op != O_constant)
1084     as_bad ("%s", emsg);
1085
1086   *val = (int) ex.X_add_number;
1087
1088   return idx;
1089 }
1090
1091 /* end of as.c */