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[binutils/dougsmingw.git] / gas / as.c
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1 /* as.c - GAS main program.
2 Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
6 This file is part of GAS, the GNU Assembler.
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 3, or (at your option)
11 any later version.
13 GAS is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
16 License for more details.
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, 51 Franklin Street - Fifth Floor, Boston, MA
21 02110-1301, USA. */
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.
28 bugs
30 : initialisers
31 Since no-one else says they will support them in future: I
32 don't support them now. */
34 #define COMMON
36 #include "as.h"
37 #include "subsegs.h"
38 #include "output-file.h"
39 #include "sb.h"
40 #include "macro.h"
41 #include "dwarf2dbg.h"
42 #include "dw2gencfi.h"
43 #include "bfdver.h"
45 #ifdef HAVE_ITBL_CPU
46 #include "itbl-ops.h"
47 #else
48 #define itbl_init()
49 #endif
51 #ifdef HAVE_SBRK
52 #ifdef NEED_DECLARATION_SBRK
53 extern void *sbrk ();
54 #endif
55 #endif
57 #ifdef USING_CGEN
58 /* Perform any cgen specific initialisation for gas. */
59 extern void gas_cgen_begin (void);
60 #endif
62 /* We build a list of defsyms as we read the options, and then define
63 them after we have initialized everything. */
64 struct defsym_list
66 struct defsym_list *next;
67 char *name;
68 valueT value;
72 /* True if a listing is wanted. */
73 int listing;
75 /* Type of debugging to generate. */
76 enum debug_info_type debug_type = DEBUG_UNSPECIFIED;
77 int use_gnu_debug_info_extensions = 0;
79 #ifndef MD_DEBUG_FORMAT_SELECTOR
80 #define MD_DEBUG_FORMAT_SELECTOR NULL
81 #endif
82 static enum debug_info_type (*md_debug_format_selector) (int *) = MD_DEBUG_FORMAT_SELECTOR;
84 /* Maximum level of macro nesting. */
85 int max_macro_nest = 100;
87 /* argv[0] */
88 static char * myname;
90 /* The default obstack chunk size. If we set this to zero, the
91 obstack code will use whatever will fit in a 4096 byte block. */
92 int chunksize = 0;
94 /* To monitor memory allocation more effectively, make this non-zero.
95 Then the chunk sizes for gas and bfd will be reduced. */
96 int debug_memory = 0;
98 /* Enable verbose mode. */
99 int verbose = 0;
101 segT reg_section;
102 segT expr_section;
103 segT text_section;
104 segT data_section;
105 segT bss_section;
107 /* Name of listing file. */
108 static char *listing_filename = NULL;
110 static struct defsym_list *defsyms;
112 #ifdef HAVE_ITBL_CPU
113 /* Keep a record of the itbl files we read in. */
114 struct itbl_file_list
116 struct itbl_file_list *next;
117 char *name;
119 static struct itbl_file_list *itbl_files;
120 #endif
122 static long start_time;
124 static int flag_macro_alternate;
127 #ifdef USE_EMULATIONS
128 #define EMULATION_ENVIRON "AS_EMULATION"
130 extern struct emulation mipsbelf, mipslelf, mipself;
131 extern struct emulation mipsbecoff, mipslecoff, mipsecoff;
132 extern struct emulation i386coff, i386elf, i386aout;
133 extern struct emulation crisaout, criself;
135 static struct emulation *const emulations[] = { EMULATIONS };
136 static const int n_emulations = sizeof (emulations) / sizeof (emulations[0]);
138 static void
139 select_emulation_mode (int argc, char **argv)
141 int i;
142 char *p, *em = 0;
144 for (i = 1; i < argc; i++)
145 if (!strncmp ("--em", argv[i], 4))
146 break;
148 if (i == argc)
149 goto do_default;
151 p = strchr (argv[i], '=');
152 if (p)
153 p++;
154 else
155 p = argv[i + 1];
157 if (!p || !*p)
158 as_fatal (_("missing emulation mode name"));
159 em = p;
161 do_default:
162 if (em == 0)
163 em = getenv (EMULATION_ENVIRON);
164 if (em == 0)
165 em = DEFAULT_EMULATION;
167 if (em)
169 for (i = 0; i < n_emulations; i++)
170 if (!strcmp (emulations[i]->name, em))
171 break;
172 if (i == n_emulations)
173 as_fatal (_("unrecognized emulation name `%s'"), em);
174 this_emulation = emulations[i];
176 else
177 this_emulation = emulations[0];
179 this_emulation->init ();
182 const char *
183 default_emul_bfd_name (void)
185 abort ();
186 return NULL;
189 void
190 common_emul_init (void)
192 this_format = this_emulation->format;
194 if (this_emulation->leading_underscore == 2)
195 this_emulation->leading_underscore = this_format->dfl_leading_underscore;
197 if (this_emulation->default_endian != 2)
198 target_big_endian = this_emulation->default_endian;
200 if (this_emulation->fake_label_name == 0)
202 if (this_emulation->leading_underscore)
203 this_emulation->fake_label_name = "L0\001";
204 else
205 /* What other parameters should we test? */
206 this_emulation->fake_label_name = ".L0\001";
209 #endif
211 void
212 print_version_id (void)
214 static int printed;
216 if (printed)
217 return;
218 printed = 1;
220 fprintf (stderr, _("GNU assembler version %s (%s) using BFD version %s\n"),
221 VERSION, TARGET_ALIAS, BFD_VERSION_STRING);
224 static void
225 show_usage (FILE * stream)
227 fprintf (stream, _("Usage: %s [option...] [asmfile...]\n"), myname);
229 fprintf (stream, _("\
230 Options:\n\
231 -a[sub-option...] turn on listings\n\
232 Sub-options [default hls]:\n\
233 c omit false conditionals\n\
234 d omit debugging directives\n\
235 g include general info\n\
236 h include high-level source\n\
237 l include assembly\n\
238 m include macro expansions\n\
239 n omit forms processing\n\
240 s include symbols\n\
241 =FILE list to FILE (must be last sub-option)\n"));
243 fprintf (stream, _("\
244 --alternate initially turn on alternate macro syntax\n"));
245 fprintf (stream, _("\
246 -D produce assembler debugging messages\n"));
247 fprintf (stream, _("\
248 --debug-prefix-map OLD=NEW Map OLD to NEW in debug information\n"));
249 fprintf (stream, _("\
250 --defsym SYM=VAL define symbol SYM to given value\n"));
251 #ifdef USE_EMULATIONS
253 int i;
254 char *def_em;
256 fprintf (stream, "\
257 --em=[");
258 for (i = 0; i < n_emulations - 1; i++)
259 fprintf (stream, "%s | ", emulations[i]->name);
260 fprintf (stream, "%s]\n", emulations[i]->name);
262 def_em = getenv (EMULATION_ENVIRON);
263 if (!def_em)
264 def_em = DEFAULT_EMULATION;
265 fprintf (stream, _("\
266 emulate output (default %s)\n"), def_em);
268 #endif
269 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
270 fprintf (stream, _("\
271 --execstack require executable stack for this object\n"));
272 fprintf (stream, _("\
273 --noexecstack don't require executable stack for this object\n"));
274 #endif
275 fprintf (stream, _("\
276 -f skip whitespace and comment preprocessing\n"));
277 fprintf (stream, _("\
278 -g --gen-debug generate debugging information\n"));
279 fprintf (stream, _("\
280 --gstabs generate STABS debugging information\n"));
281 fprintf (stream, _("\
282 --gstabs+ generate STABS debug info with GNU extensions\n"));
283 fprintf (stream, _("\
284 --gdwarf-2 generate DWARF2 debugging information\n"));
285 fprintf (stream, _("\
286 --hash-size=<value> set the hash table size close to <value>\n"));
287 fprintf (stream, _("\
288 --help show this message and exit\n"));
289 fprintf (stream, _("\
290 --target-help show target specific options\n"));
291 fprintf (stream, _("\
292 -I DIR add DIR to search list for .include directives\n"));
293 fprintf (stream, _("\
294 -J don't warn about signed overflow\n"));
295 fprintf (stream, _("\
296 -K warn when differences altered for long displacements\n"));
297 fprintf (stream, _("\
298 -L,--keep-locals keep local symbols (e.g. starting with `L')\n"));
299 fprintf (stream, _("\
300 -M,--mri assemble in MRI compatibility mode\n"));
301 fprintf (stream, _("\
302 --MD FILE write dependency information in FILE (default none)\n"));
303 fprintf (stream, _("\
304 -nocpp ignored\n"));
305 fprintf (stream, _("\
306 -o OBJFILE name the object-file output OBJFILE (default a.out)\n"));
307 fprintf (stream, _("\
308 -R fold data section into text section\n"));
309 fprintf (stream, _("\
310 --reduce-memory-overheads \n\
311 prefer smaller memory use at the cost of longer\n\
312 assembly times\n"));
313 fprintf (stream, _("\
314 --statistics print various measured statistics from execution\n"));
315 fprintf (stream, _("\
316 --strip-local-absolute strip local absolute symbols\n"));
317 fprintf (stream, _("\
318 --traditional-format Use same format as native assembler when possible\n"));
319 fprintf (stream, _("\
320 --version print assembler version number and exit\n"));
321 fprintf (stream, _("\
322 -W --no-warn suppress warnings\n"));
323 fprintf (stream, _("\
324 --warn don't suppress warnings\n"));
325 fprintf (stream, _("\
326 --fatal-warnings treat warnings as errors\n"));
327 #ifdef HAVE_ITBL_CPU
328 fprintf (stream, _("\
329 --itbl INSTTBL extend instruction set to include instructions\n\
330 matching the specifications defined in file INSTTBL\n"));
331 #endif
332 fprintf (stream, _("\
333 -w ignored\n"));
334 fprintf (stream, _("\
335 -X ignored\n"));
336 fprintf (stream, _("\
337 -Z generate object file even after errors\n"));
338 fprintf (stream, _("\
339 --listing-lhs-width set the width in words of the output data column of\n\
340 the listing\n"));
341 fprintf (stream, _("\
342 --listing-lhs-width2 set the width in words of the continuation lines\n\
343 of the output data column; ignored if smaller than\n\
344 the width of the first line\n"));
345 fprintf (stream, _("\
346 --listing-rhs-width set the max width in characters of the lines from\n\
347 the source file\n"));
348 fprintf (stream, _("\
349 --listing-cont-lines set the maximum number of continuation lines used\n\
350 for the output data column of the listing\n"));
351 fprintf (stream, _("\
352 @FILE read options from FILE\n"));
354 md_show_usage (stream);
356 fputc ('\n', stream);
358 if (REPORT_BUGS_TO[0] && stream == stdout)
359 fprintf (stream, _("Report bugs to %s\n"), REPORT_BUGS_TO);
362 /* Since it is easy to do here we interpret the special arg "-"
363 to mean "use stdin" and we set that argv[] pointing to "".
364 After we have munged argv[], the only things left are source file
365 name(s) and ""(s) denoting stdin. These file names are used
366 (perhaps more than once) later.
368 check for new machine-dep cmdline options in
369 md_parse_option definitions in config/tc-*.c. */
371 static void
372 parse_args (int * pargc, char *** pargv)
374 int old_argc;
375 int new_argc;
376 char ** old_argv;
377 char ** new_argv;
378 /* Starting the short option string with '-' is for programs that
379 expect options and other ARGV-elements in any order and that care about
380 the ordering of the two. We describe each non-option ARGV-element
381 as if it were the argument of an option with character code 1. */
382 char *shortopts;
383 extern const char *md_shortopts;
384 static const char std_shortopts[] =
386 '-', 'J',
387 #ifndef WORKING_DOT_WORD
388 /* -K is not meaningful if .word is not being hacked. */
389 'K',
390 #endif
391 'L', 'M', 'R', 'W', 'Z', 'a', ':', ':', 'D', 'f', 'g', ':',':', 'I', ':', 'o', ':',
392 #ifndef VMS
393 /* -v takes an argument on VMS, so we don't make it a generic
394 option. */
395 'v',
396 #endif
397 'w', 'X',
398 #ifdef HAVE_ITBL_CPU
399 /* New option for extending instruction set (see also --itbl below). */
400 't', ':',
401 #endif
402 '\0'
404 struct option *longopts;
405 extern struct option md_longopts[];
406 extern size_t md_longopts_size;
407 /* Codes used for the long options with no short synonyms. */
408 enum option_values
410 OPTION_HELP = OPTION_STD_BASE,
411 OPTION_NOCPP,
412 OPTION_STATISTICS,
413 OPTION_VERSION,
414 OPTION_DUMPCONFIG,
415 OPTION_VERBOSE,
416 OPTION_EMULATION,
417 OPTION_DEBUG_PREFIX_MAP,
418 OPTION_DEFSYM,
419 OPTION_LISTING_LHS_WIDTH,
420 OPTION_LISTING_LHS_WIDTH2,
421 OPTION_LISTING_RHS_WIDTH,
422 OPTION_LISTING_CONT_LINES,
423 OPTION_DEPFILE,
424 OPTION_GSTABS,
425 OPTION_GSTABS_PLUS,
426 OPTION_GDWARF2,
427 OPTION_STRIP_LOCAL_ABSOLUTE,
428 OPTION_TRADITIONAL_FORMAT,
429 OPTION_WARN,
430 OPTION_TARGET_HELP,
431 OPTION_EXECSTACK,
432 OPTION_NOEXECSTACK,
433 OPTION_ALTERNATE,
434 OPTION_AL,
435 OPTION_HASH_TABLE_SIZE,
436 OPTION_REDUCE_MEMORY_OVERHEADS,
437 OPTION_WARN_FATAL
438 /* When you add options here, check that they do
439 not collide with OPTION_MD_BASE. See as.h. */
442 static const struct option std_longopts[] =
444 /* Note: commas are placed at the start of the line rather than
445 the end of the preceeding line so that it is simpler to
446 selectively add and remove lines from this list. */
447 {"alternate", no_argument, NULL, OPTION_ALTERNATE}
448 /* The entry for "a" is here to prevent getopt_long_only() from
449 considering that -a is an abbreviation for --alternate. This is
450 necessary because -a=<FILE> is a valid switch but getopt would
451 normally reject it since --alternate does not take an argument. */
452 ,{"a", optional_argument, NULL, 'a'}
453 /* Handle -al=<FILE>. */
454 ,{"al", optional_argument, NULL, OPTION_AL}
455 ,{"debug-prefix-map", required_argument, NULL, OPTION_DEBUG_PREFIX_MAP}
456 ,{"defsym", required_argument, NULL, OPTION_DEFSYM}
457 ,{"dump-config", no_argument, NULL, OPTION_DUMPCONFIG}
458 ,{"emulation", required_argument, NULL, OPTION_EMULATION}
459 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
460 ,{"execstack", no_argument, NULL, OPTION_EXECSTACK}
461 ,{"noexecstack", no_argument, NULL, OPTION_NOEXECSTACK}
462 #endif
463 ,{"fatal-warnings", no_argument, NULL, OPTION_WARN_FATAL}
464 ,{"gdwarf-2", no_argument, NULL, OPTION_GDWARF2}
465 /* GCC uses --gdwarf-2 but GAS uses to use --gdwarf2,
466 so we keep it here for backwards compatibility. */
467 ,{"gdwarf2", no_argument, NULL, OPTION_GDWARF2}
468 ,{"gen-debug", no_argument, NULL, 'g'}
469 ,{"gstabs", no_argument, NULL, OPTION_GSTABS}
470 ,{"gstabs+", no_argument, NULL, OPTION_GSTABS_PLUS}
471 ,{"hash-size", required_argument, NULL, OPTION_HASH_TABLE_SIZE}
472 ,{"help", no_argument, NULL, OPTION_HELP}
473 #ifdef HAVE_ITBL_CPU
474 /* New option for extending instruction set (see also -t above).
475 The "-t file" or "--itbl file" option extends the basic set of
476 valid instructions by reading "file", a text file containing a
477 list of instruction formats. The additional opcodes and their
478 formats are added to the built-in set of instructions, and
479 mnemonics for new registers may also be defined. */
480 ,{"itbl", required_argument, NULL, 't'}
481 #endif
482 /* getopt allows abbreviations, so we do this to stop it from
483 treating -k as an abbreviation for --keep-locals. Some
484 ports use -k to enable PIC assembly. */
485 ,{"keep-locals", no_argument, NULL, 'L'}
486 ,{"keep-locals", no_argument, NULL, 'L'}
487 ,{"listing-lhs-width", required_argument, NULL, OPTION_LISTING_LHS_WIDTH}
488 ,{"listing-lhs-width2", required_argument, NULL, OPTION_LISTING_LHS_WIDTH2}
489 ,{"listing-rhs-width", required_argument, NULL, OPTION_LISTING_RHS_WIDTH}
490 ,{"listing-cont-lines", required_argument, NULL, OPTION_LISTING_CONT_LINES}
491 ,{"MD", required_argument, NULL, OPTION_DEPFILE}
492 ,{"mri", no_argument, NULL, 'M'}
493 ,{"nocpp", no_argument, NULL, OPTION_NOCPP}
494 ,{"no-warn", no_argument, NULL, 'W'}
495 ,{"reduce-memory-overheads", no_argument, NULL, OPTION_REDUCE_MEMORY_OVERHEADS}
496 ,{"statistics", no_argument, NULL, OPTION_STATISTICS}
497 ,{"strip-local-absolute", no_argument, NULL, OPTION_STRIP_LOCAL_ABSOLUTE}
498 ,{"version", no_argument, NULL, OPTION_VERSION}
499 ,{"verbose", no_argument, NULL, OPTION_VERBOSE}
500 ,{"target-help", no_argument, NULL, OPTION_TARGET_HELP}
501 ,{"traditional-format", no_argument, NULL, OPTION_TRADITIONAL_FORMAT}
502 ,{"warn", no_argument, NULL, OPTION_WARN}
505 /* Construct the option lists from the standard list and the target
506 dependent list. Include space for an extra NULL option and
507 always NULL terminate. */
508 shortopts = concat (std_shortopts, md_shortopts, (char *) NULL);
509 longopts = (struct option *) xmalloc (sizeof (std_longopts)
510 + md_longopts_size + sizeof (struct option));
511 memcpy (longopts, std_longopts, sizeof (std_longopts));
512 memcpy (((char *) longopts) + sizeof (std_longopts), md_longopts, md_longopts_size);
513 memset (((char *) longopts) + sizeof (std_longopts) + md_longopts_size,
514 0, sizeof (struct option));
516 /* Make a local copy of the old argv. */
517 old_argc = *pargc;
518 old_argv = *pargv;
520 /* Initialize a new argv that contains no options. */
521 new_argv = (char **) xmalloc (sizeof (char *) * (old_argc + 1));
522 new_argv[0] = old_argv[0];
523 new_argc = 1;
524 new_argv[new_argc] = NULL;
526 while (1)
528 /* getopt_long_only is like getopt_long, but '-' as well as '--' can
529 indicate a long option. */
530 int longind;
531 int optc = getopt_long_only (old_argc, old_argv, shortopts, longopts,
532 &longind);
534 if (optc == -1)
535 break;
537 switch (optc)
539 default:
540 /* md_parse_option should return 1 if it recognizes optc,
541 0 if not. */
542 if (md_parse_option (optc, optarg) != 0)
543 break;
544 /* `-v' isn't included in the general short_opts list, so check for
545 it explicitly here before deciding we've gotten a bad argument. */
546 if (optc == 'v')
548 #ifdef VMS
549 /* Telling getopt to treat -v's value as optional can result
550 in it picking up a following filename argument here. The
551 VMS code in md_parse_option can return 0 in that case,
552 but it has no way of pushing the filename argument back. */
553 if (optarg && *optarg)
554 new_argv[new_argc++] = optarg, new_argv[new_argc] = NULL;
555 else
556 #else
557 case 'v':
558 #endif
559 case OPTION_VERBOSE:
560 print_version_id ();
561 verbose = 1;
562 break;
564 else
565 as_bad (_("unrecognized option -%c%s"), optc, optarg ? optarg : "");
566 /* Fall through. */
568 case '?':
569 exit (EXIT_FAILURE);
571 case 1: /* File name. */
572 if (!strcmp (optarg, "-"))
573 optarg = "";
574 new_argv[new_argc++] = optarg;
575 new_argv[new_argc] = NULL;
576 break;
578 case OPTION_TARGET_HELP:
579 md_show_usage (stdout);
580 exit (EXIT_SUCCESS);
582 case OPTION_HELP:
583 show_usage (stdout);
584 exit (EXIT_SUCCESS);
586 case OPTION_NOCPP:
587 break;
589 case OPTION_STATISTICS:
590 flag_print_statistics = 1;
591 break;
593 case OPTION_STRIP_LOCAL_ABSOLUTE:
594 flag_strip_local_absolute = 1;
595 break;
597 case OPTION_TRADITIONAL_FORMAT:
598 flag_traditional_format = 1;
599 break;
601 case OPTION_VERSION:
602 /* This output is intended to follow the GNU standards document. */
603 printf (_("GNU assembler %s\n"), BFD_VERSION_STRING);
604 printf (_("Copyright 2010 Free Software Foundation, Inc.\n"));
605 printf (_("\
606 This program is free software; you may redistribute it under the terms of\n\
607 the GNU General Public License version 3 or later.\n\
608 This program has absolutely no warranty.\n"));
609 printf (_("This assembler was configured for a target of `%s'.\n"),
610 TARGET_ALIAS);
611 exit (EXIT_SUCCESS);
613 case OPTION_EMULATION:
614 #ifdef USE_EMULATIONS
615 if (strcmp (optarg, this_emulation->name))
616 as_fatal (_("multiple emulation names specified"));
617 #else
618 as_fatal (_("emulations not handled in this configuration"));
619 #endif
620 break;
622 case OPTION_DUMPCONFIG:
623 fprintf (stderr, _("alias = %s\n"), TARGET_ALIAS);
624 fprintf (stderr, _("canonical = %s\n"), TARGET_CANONICAL);
625 fprintf (stderr, _("cpu-type = %s\n"), TARGET_CPU);
626 #ifdef TARGET_OBJ_FORMAT
627 fprintf (stderr, _("format = %s\n"), TARGET_OBJ_FORMAT);
628 #endif
629 #ifdef TARGET_FORMAT
630 fprintf (stderr, _("bfd-target = %s\n"), TARGET_FORMAT);
631 #endif
632 exit (EXIT_SUCCESS);
634 case OPTION_DEBUG_PREFIX_MAP:
635 add_debug_prefix_map (optarg);
636 break;
638 case OPTION_DEFSYM:
640 char *s;
641 valueT i;
642 struct defsym_list *n;
644 for (s = optarg; *s != '\0' && *s != '='; s++)
646 if (*s == '\0')
647 as_fatal (_("bad defsym; format is --defsym name=value"));
648 *s++ = '\0';
649 i = bfd_scan_vma (s, (const char **) NULL, 0);
650 n = (struct defsym_list *) xmalloc (sizeof *n);
651 n->next = defsyms;
652 n->name = optarg;
653 n->value = i;
654 defsyms = n;
656 break;
658 #ifdef HAVE_ITBL_CPU
659 case 't':
661 /* optarg is the name of the file containing the instruction
662 formats, opcodes, register names, etc. */
663 struct itbl_file_list *n;
665 if (optarg == NULL)
667 as_warn (_("no file name following -t option"));
668 break;
671 n = xmalloc (sizeof * n);
672 n->next = itbl_files;
673 n->name = optarg;
674 itbl_files = n;
676 /* Parse the file and add the new instructions to our internal
677 table. If multiple instruction tables are specified, the
678 information from this table gets appended onto the existing
679 internal table. */
680 itbl_files->name = xstrdup (optarg);
681 if (itbl_parse (itbl_files->name) != 0)
682 as_fatal (_("failed to read instruction table %s\n"),
683 itbl_files->name);
685 break;
686 #endif
688 case OPTION_DEPFILE:
689 start_dependencies (optarg);
690 break;
692 case 'g':
693 /* Some backends, eg Alpha and Mips, use the -g switch for their
694 own purposes. So we check here for an explicit -g and allow
695 the backend to decide if it wants to process it. */
696 if ( old_argv[optind - 1][1] == 'g'
697 && md_parse_option (optc, optarg))
698 continue;
700 if (md_debug_format_selector)
701 debug_type = md_debug_format_selector (& use_gnu_debug_info_extensions);
702 else if (IS_ELF)
703 debug_type = DEBUG_DWARF2;
704 else
705 debug_type = DEBUG_STABS;
706 break;
708 case OPTION_GSTABS_PLUS:
709 use_gnu_debug_info_extensions = 1;
710 /* Fall through. */
711 case OPTION_GSTABS:
712 debug_type = DEBUG_STABS;
713 break;
715 case OPTION_GDWARF2:
716 debug_type = DEBUG_DWARF2;
717 break;
719 case 'J':
720 flag_signed_overflow_ok = 1;
721 break;
723 #ifndef WORKING_DOT_WORD
724 case 'K':
725 flag_warn_displacement = 1;
726 break;
727 #endif
728 case 'L':
729 flag_keep_locals = 1;
730 break;
732 case OPTION_LISTING_LHS_WIDTH:
733 listing_lhs_width = atoi (optarg);
734 if (listing_lhs_width_second < listing_lhs_width)
735 listing_lhs_width_second = listing_lhs_width;
736 break;
737 case OPTION_LISTING_LHS_WIDTH2:
739 int tmp = atoi (optarg);
741 if (tmp > listing_lhs_width)
742 listing_lhs_width_second = tmp;
744 break;
745 case OPTION_LISTING_RHS_WIDTH:
746 listing_rhs_width = atoi (optarg);
747 break;
748 case OPTION_LISTING_CONT_LINES:
749 listing_lhs_cont_lines = atoi (optarg);
750 break;
752 case 'M':
753 flag_mri = 1;
754 #ifdef TC_M68K
755 flag_m68k_mri = 1;
756 #endif
757 break;
759 case 'R':
760 flag_readonly_data_in_text = 1;
761 break;
763 case 'W':
764 flag_no_warnings = 1;
765 break;
767 case OPTION_WARN:
768 flag_no_warnings = 0;
769 flag_fatal_warnings = 0;
770 break;
772 case OPTION_WARN_FATAL:
773 flag_no_warnings = 0;
774 flag_fatal_warnings = 1;
775 break;
777 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
778 case OPTION_EXECSTACK:
779 flag_execstack = 1;
780 flag_noexecstack = 0;
781 break;
783 case OPTION_NOEXECSTACK:
784 flag_noexecstack = 1;
785 flag_execstack = 0;
786 break;
787 #endif
788 case 'Z':
789 flag_always_generate_output = 1;
790 break;
792 case OPTION_AL:
793 listing |= LISTING_LISTING;
794 if (optarg)
795 listing_filename = xstrdup (optarg);
796 break;
798 case OPTION_ALTERNATE:
799 optarg = old_argv [optind - 1];
800 while (* optarg == '-')
801 optarg ++;
803 if (strcmp (optarg, "alternate") == 0)
805 flag_macro_alternate = 1;
806 break;
808 optarg ++;
809 /* Fall through. */
811 case 'a':
812 if (optarg)
814 if (optarg != old_argv[optind] && optarg[-1] == '=')
815 --optarg;
817 if (md_parse_option (optc, optarg) != 0)
818 break;
820 while (*optarg)
822 switch (*optarg)
824 case 'c':
825 listing |= LISTING_NOCOND;
826 break;
827 case 'd':
828 listing |= LISTING_NODEBUG;
829 break;
830 case 'g':
831 listing |= LISTING_GENERAL;
832 break;
833 case 'h':
834 listing |= LISTING_HLL;
835 break;
836 case 'l':
837 listing |= LISTING_LISTING;
838 break;
839 case 'm':
840 listing |= LISTING_MACEXP;
841 break;
842 case 'n':
843 listing |= LISTING_NOFORM;
844 break;
845 case 's':
846 listing |= LISTING_SYMBOLS;
847 break;
848 case '=':
849 listing_filename = xstrdup (optarg + 1);
850 optarg += strlen (listing_filename);
851 break;
852 default:
853 as_fatal (_("invalid listing option `%c'"), *optarg);
854 break;
856 optarg++;
859 if (!listing)
860 listing = LISTING_DEFAULT;
861 break;
863 case 'D':
864 /* DEBUG is implemented: it debugs different
865 things from other people's assemblers. */
866 flag_debug = 1;
867 break;
869 case 'f':
870 flag_no_comments = 1;
871 break;
873 case 'I':
874 { /* Include file directory. */
875 char *temp = xstrdup (optarg);
877 add_include_dir (temp);
878 break;
881 case 'o':
882 out_file_name = xstrdup (optarg);
883 break;
885 case 'w':
886 break;
888 case 'X':
889 /* -X means treat warnings as errors. */
890 break;
892 case OPTION_REDUCE_MEMORY_OVERHEADS:
893 /* The only change we make at the moment is to reduce
894 the size of the hash tables that we use. */
895 set_gas_hash_table_size (4051);
896 break;
898 case OPTION_HASH_TABLE_SIZE:
900 unsigned long new_size;
902 new_size = strtoul (optarg, NULL, 0);
903 if (new_size)
904 set_gas_hash_table_size (new_size);
905 else
906 as_fatal (_("--hash-size needs a numeric argument"));
907 break;
912 free (shortopts);
913 free (longopts);
915 *pargc = new_argc;
916 *pargv = new_argv;
918 #ifdef md_after_parse_args
919 md_after_parse_args ();
920 #endif
923 static void
924 dump_statistics (void)
926 #ifdef HAVE_SBRK
927 char *lim = (char *) sbrk (0);
928 #endif
929 long run_time = get_run_time () - start_time;
931 fprintf (stderr, _("%s: total time in assembly: %ld.%06ld\n"),
932 myname, run_time / 1000000, run_time % 1000000);
933 #ifdef HAVE_SBRK
934 fprintf (stderr, _("%s: data size %ld\n"),
935 myname, (long) (lim - (char *) &environ));
936 #endif
938 subsegs_print_statistics (stderr);
939 write_print_statistics (stderr);
940 symbol_print_statistics (stderr);
941 read_print_statistics (stderr);
943 #ifdef tc_print_statistics
944 tc_print_statistics (stderr);
945 #endif
947 #ifdef obj_print_statistics
948 obj_print_statistics (stderr);
949 #endif
952 static void
953 close_output_file (void)
955 output_file_close (out_file_name);
958 /* The interface between the macro code and gas expression handling. */
960 static int
961 macro_expr (const char *emsg, int idx, sb *in, int *val)
963 char *hold;
964 expressionS ex;
966 sb_terminate (in);
968 hold = input_line_pointer;
969 input_line_pointer = in->ptr + idx;
970 expression_and_evaluate (&ex);
971 idx = input_line_pointer - in->ptr;
972 input_line_pointer = hold;
974 if (ex.X_op != O_constant)
975 as_bad ("%s", emsg);
977 *val = (int) ex.X_add_number;
979 return idx;
982 /* Here to attempt 1 pass over each input file.
983 We scan argv[*] looking for filenames or exactly "" which is
984 shorthand for stdin. Any argv that is NULL is not a file-name.
985 We set need_pass_2 TRUE if, after this, we still have unresolved
986 expressions of the form (unknown value)+-(unknown value).
988 Note the un*x semantics: there is only 1 logical input file, but it
989 may be a catenation of many 'physical' input files. */
991 static void
992 perform_an_assembly_pass (int argc, char ** argv)
994 int saw_a_file = 0;
995 flagword applicable;
997 need_pass_2 = 0;
999 /* Create the standard sections, and those the assembler uses
1000 internally. */
1001 text_section = subseg_new (TEXT_SECTION_NAME, 0);
1002 data_section = subseg_new (DATA_SECTION_NAME, 0);
1003 bss_section = subseg_new (BSS_SECTION_NAME, 0);
1004 /* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
1005 to have relocs, otherwise we don't find out in time. */
1006 applicable = bfd_applicable_section_flags (stdoutput);
1007 bfd_set_section_flags (stdoutput, text_section,
1008 applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1009 | SEC_CODE | SEC_READONLY));
1010 bfd_set_section_flags (stdoutput, data_section,
1011 applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1012 | SEC_DATA));
1013 bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
1014 seg_info (bss_section)->bss = 1;
1015 subseg_new (BFD_ABS_SECTION_NAME, 0);
1016 subseg_new (BFD_UND_SECTION_NAME, 0);
1017 reg_section = subseg_new ("*GAS `reg' section*", 0);
1018 expr_section = subseg_new ("*GAS `expr' section*", 0);
1020 subseg_set (text_section, 0);
1022 /* This may add symbol table entries, which requires having an open BFD,
1023 and sections already created. */
1024 md_begin ();
1026 #ifdef USING_CGEN
1027 gas_cgen_begin ();
1028 #endif
1029 #ifdef obj_begin
1030 obj_begin ();
1031 #endif
1033 /* Skip argv[0]. */
1034 argv++;
1035 argc--;
1037 while (argc--)
1039 if (*argv)
1040 { /* Is it a file-name argument? */
1041 PROGRESS (1);
1042 saw_a_file++;
1043 /* argv->"" if stdin desired, else->filename. */
1044 read_a_source_file (*argv);
1046 argv++; /* Completed that argv. */
1048 if (!saw_a_file)
1049 read_a_source_file ("");
1052 #ifdef OBJ_ELF
1053 static void
1054 create_obj_attrs_section (void)
1056 segT s;
1057 char *p;
1058 addressT addr;
1059 offsetT size;
1060 const char *name;
1062 size = bfd_elf_obj_attr_size (stdoutput);
1063 if (size)
1065 name = get_elf_backend_data (stdoutput)->obj_attrs_section;
1066 if (!name)
1067 name = ".gnu.attributes";
1068 s = subseg_new (name, 0);
1069 elf_section_type (s)
1070 = get_elf_backend_data (stdoutput)->obj_attrs_section_type;
1071 bfd_set_section_flags (stdoutput, s, SEC_READONLY | SEC_DATA);
1072 addr = frag_now_fix ();
1073 p = frag_more (size);
1074 bfd_elf_set_obj_attr_contents (stdoutput, (bfd_byte *)p, size);
1077 #endif
1081 main (int argc, char ** argv)
1083 char ** argv_orig = argv;
1085 int macro_strip_at;
1086 int keep_it;
1088 start_time = get_run_time ();
1090 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
1091 setlocale (LC_MESSAGES, "");
1092 #endif
1093 #if defined (HAVE_SETLOCALE)
1094 setlocale (LC_CTYPE, "");
1095 #endif
1096 bindtextdomain (PACKAGE, LOCALEDIR);
1097 textdomain (PACKAGE);
1099 if (debug_memory)
1100 chunksize = 64;
1102 #ifdef HOST_SPECIAL_INIT
1103 HOST_SPECIAL_INIT (argc, argv);
1104 #endif
1106 myname = argv[0];
1107 xmalloc_set_program_name (myname);
1109 expandargv (&argc, &argv);
1111 START_PROGRESS (myname, 0);
1113 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
1114 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
1115 #endif
1117 out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
1119 hex_init ();
1120 bfd_init ();
1121 bfd_set_error_program_name (myname);
1123 #ifdef USE_EMULATIONS
1124 select_emulation_mode (argc, argv);
1125 #endif
1127 PROGRESS (1);
1128 /* Call parse_args before any of the init/begin functions
1129 so that switches like --hash-size can be honored. */
1130 parse_args (&argc, &argv);
1131 symbol_begin ();
1132 frag_init ();
1133 subsegs_begin ();
1134 read_begin ();
1135 input_scrub_begin ();
1136 expr_begin ();
1138 /* It has to be called after dump_statistics (). */
1139 xatexit (close_output_file);
1141 if (flag_print_statistics)
1142 xatexit (dump_statistics);
1144 macro_strip_at = 0;
1145 #ifdef TC_I960
1146 macro_strip_at = flag_mri;
1147 #endif
1149 macro_init (flag_macro_alternate, flag_mri, macro_strip_at, macro_expr);
1151 PROGRESS (1);
1153 output_file_create (out_file_name);
1154 gas_assert (stdoutput != 0);
1156 #ifdef tc_init_after_args
1157 tc_init_after_args ();
1158 #endif
1160 itbl_init ();
1162 dwarf2_init ();
1164 /* Now that we have fully initialized, and have created the output
1165 file, define any symbols requested by --defsym command line
1166 arguments. */
1167 while (defsyms != NULL)
1169 symbolS *sym;
1170 struct defsym_list *next;
1172 sym = symbol_new (defsyms->name, absolute_section, defsyms->value,
1173 &zero_address_frag);
1174 /* Make symbols defined on the command line volatile, so that they
1175 can be redefined inside a source file. This makes this assembler's
1176 behaviour compatible with earlier versions, but it may not be
1177 completely intuitive. */
1178 S_SET_VOLATILE (sym);
1179 symbol_table_insert (sym);
1180 next = defsyms->next;
1181 free (defsyms);
1182 defsyms = next;
1185 PROGRESS (1);
1187 /* Assemble it. */
1188 perform_an_assembly_pass (argc, argv);
1190 cond_finish_check (-1);
1192 #ifdef md_end
1193 md_end ();
1194 #endif
1196 #ifdef OBJ_ELF
1197 if (IS_ELF)
1198 create_obj_attrs_section ();
1199 #endif
1201 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
1202 if ((flag_execstack || flag_noexecstack)
1203 && OUTPUT_FLAVOR == bfd_target_elf_flavour)
1205 segT gnustack;
1207 gnustack = subseg_new (".note.GNU-stack", 0);
1208 bfd_set_section_flags (stdoutput, gnustack,
1209 SEC_READONLY | (flag_execstack ? SEC_CODE : 0));
1212 #endif
1214 /* If we've been collecting dwarf2 .debug_line info, either for
1215 assembly debugging or on behalf of the compiler, emit it now. */
1216 dwarf2_finish ();
1218 /* If we constructed dwarf2 .eh_frame info, either via .cfi
1219 directives from the user or by the backend, emit it now. */
1220 cfi_finish ();
1222 if (seen_at_least_1_file ()
1223 && (flag_always_generate_output || had_errors () == 0))
1224 keep_it = 1;
1225 else
1226 keep_it = 0;
1228 /* This used to be done at the start of write_object_file in
1229 write.c, but that caused problems when doing listings when
1230 keep_it was zero. This could probably be moved above md_end, but
1231 I didn't want to risk the change. */
1232 subsegs_finish ();
1234 if (keep_it)
1235 write_object_file ();
1237 fflush (stderr);
1239 #ifndef NO_LISTING
1240 listing_print (listing_filename, argv_orig);
1241 #endif
1243 if (flag_fatal_warnings && had_warnings () > 0 && had_errors () == 0)
1244 as_bad (_("%d warnings, treating warnings as errors"), had_warnings ());
1246 if (had_errors () > 0 && ! flag_always_generate_output)
1247 keep_it = 0;
1249 if (!keep_it)
1250 unlink_if_ordinary (out_file_name);
1252 input_scrub_end ();
1254 END_PROGRESS (myname);
1256 /* Use xexit instead of return, because under VMS environments they
1257 may not place the same interpretation on the value given. */
1258 if (had_errors () > 0)
1259 xexit (EXIT_FAILURE);
1261 /* Only generate dependency file if assembler was successful. */
1262 print_dependencies ();
1264 xexit (EXIT_SUCCESS);