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[binutils.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
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 = xmalloc (sizeof (std_longopts) + md_longopts_size + sizeof (struct option));
510 memcpy (longopts, std_longopts, sizeof (std_longopts));
511 memcpy (((char *) longopts) + sizeof (std_longopts), md_longopts, md_longopts_size);
512 memset (((char *) longopts) + sizeof (std_longopts) + md_longopts_size,
513 0, sizeof (struct option));
515 /* Make a local copy of the old argv. */
516 old_argc = *pargc;
517 old_argv = *pargv;
519 /* Initialize a new argv that contains no options. */
520 new_argv = xmalloc (sizeof (char *) * (old_argc + 1));
521 new_argv[0] = old_argv[0];
522 new_argc = 1;
523 new_argv[new_argc] = NULL;
525 while (1)
527 /* getopt_long_only is like getopt_long, but '-' as well as '--' can
528 indicate a long option. */
529 int longind;
530 int optc = getopt_long_only (old_argc, old_argv, shortopts, longopts,
531 &longind);
533 if (optc == -1)
534 break;
536 switch (optc)
538 default:
539 /* md_parse_option should return 1 if it recognizes optc,
540 0 if not. */
541 if (md_parse_option (optc, optarg) != 0)
542 break;
543 /* `-v' isn't included in the general short_opts list, so check for
544 it explicitly here before deciding we've gotten a bad argument. */
545 if (optc == 'v')
547 #ifdef VMS
548 /* Telling getopt to treat -v's value as optional can result
549 in it picking up a following filename argument here. The
550 VMS code in md_parse_option can return 0 in that case,
551 but it has no way of pushing the filename argument back. */
552 if (optarg && *optarg)
553 new_argv[new_argc++] = optarg, new_argv[new_argc] = NULL;
554 else
555 #else
556 case 'v':
557 #endif
558 case OPTION_VERBOSE:
559 print_version_id ();
560 verbose = 1;
561 break;
563 else
564 as_bad (_("unrecognized option -%c%s"), optc, optarg ? optarg : "");
565 /* Fall through. */
567 case '?':
568 exit (EXIT_FAILURE);
570 case 1: /* File name. */
571 if (!strcmp (optarg, "-"))
572 optarg = "";
573 new_argv[new_argc++] = optarg;
574 new_argv[new_argc] = NULL;
575 break;
577 case OPTION_TARGET_HELP:
578 md_show_usage (stdout);
579 exit (EXIT_SUCCESS);
581 case OPTION_HELP:
582 show_usage (stdout);
583 exit (EXIT_SUCCESS);
585 case OPTION_NOCPP:
586 break;
588 case OPTION_STATISTICS:
589 flag_print_statistics = 1;
590 break;
592 case OPTION_STRIP_LOCAL_ABSOLUTE:
593 flag_strip_local_absolute = 1;
594 break;
596 case OPTION_TRADITIONAL_FORMAT:
597 flag_traditional_format = 1;
598 break;
600 case OPTION_VERSION:
601 /* This output is intended to follow the GNU standards document. */
602 printf (_("GNU assembler %s\n"), BFD_VERSION_STRING);
603 printf (_("Copyright 2007 Free Software Foundation, Inc.\n"));
604 printf (_("\
605 This program is free software; you may redistribute it under the terms of\n\
606 the GNU General Public License version 3 or later.\n\
607 This program has absolutely no warranty.\n"));
608 printf (_("This assembler was configured for a target of `%s'.\n"),
609 TARGET_ALIAS);
610 exit (EXIT_SUCCESS);
612 case OPTION_EMULATION:
613 #ifdef USE_EMULATIONS
614 if (strcmp (optarg, this_emulation->name))
615 as_fatal (_("multiple emulation names specified"));
616 #else
617 as_fatal (_("emulations not handled in this configuration"));
618 #endif
619 break;
621 case OPTION_DUMPCONFIG:
622 fprintf (stderr, _("alias = %s\n"), TARGET_ALIAS);
623 fprintf (stderr, _("canonical = %s\n"), TARGET_CANONICAL);
624 fprintf (stderr, _("cpu-type = %s\n"), TARGET_CPU);
625 #ifdef TARGET_OBJ_FORMAT
626 fprintf (stderr, _("format = %s\n"), TARGET_OBJ_FORMAT);
627 #endif
628 #ifdef TARGET_FORMAT
629 fprintf (stderr, _("bfd-target = %s\n"), TARGET_FORMAT);
630 #endif
631 exit (EXIT_SUCCESS);
633 case OPTION_DEBUG_PREFIX_MAP:
634 add_debug_prefix_map (optarg);
635 break;
637 case OPTION_DEFSYM:
639 char *s;
640 valueT i;
641 struct defsym_list *n;
643 for (s = optarg; *s != '\0' && *s != '='; s++)
645 if (*s == '\0')
646 as_fatal (_("bad defsym; format is --defsym name=value"));
647 *s++ = '\0';
648 i = bfd_scan_vma (s, (const char **) NULL, 0);
649 n = xmalloc (sizeof *n);
650 n->next = defsyms;
651 n->name = optarg;
652 n->value = i;
653 defsyms = n;
655 break;
657 #ifdef HAVE_ITBL_CPU
658 case 't':
660 /* optarg is the name of the file containing the instruction
661 formats, opcodes, register names, etc. */
662 struct itbl_file_list *n;
664 if (optarg == NULL)
666 as_warn (_("no file name following -t option"));
667 break;
670 n = xmalloc (sizeof * n);
671 n->next = itbl_files;
672 n->name = optarg;
673 itbl_files = n;
675 /* Parse the file and add the new instructions to our internal
676 table. If multiple instruction tables are specified, the
677 information from this table gets appended onto the existing
678 internal table. */
679 itbl_files->name = xstrdup (optarg);
680 if (itbl_parse (itbl_files->name) != 0)
681 as_fatal (_("failed to read instruction table %s\n"),
682 itbl_files->name);
684 break;
685 #endif
687 case OPTION_DEPFILE:
688 start_dependencies (optarg);
689 break;
691 case 'g':
692 /* Some backends, eg Alpha and Mips, use the -g switch for their
693 own purposes. So we check here for an explicit -g and allow
694 the backend to decide if it wants to process it. */
695 if ( old_argv[optind - 1][1] == 'g'
696 && md_parse_option (optc, optarg))
697 continue;
699 if (md_debug_format_selector)
700 debug_type = md_debug_format_selector (& use_gnu_debug_info_extensions);
701 else if (IS_ELF)
702 debug_type = DEBUG_DWARF2;
703 else
704 debug_type = DEBUG_STABS;
705 break;
707 case OPTION_GSTABS_PLUS:
708 use_gnu_debug_info_extensions = 1;
709 /* Fall through. */
710 case OPTION_GSTABS:
711 debug_type = DEBUG_STABS;
712 break;
714 case OPTION_GDWARF2:
715 debug_type = DEBUG_DWARF2;
716 break;
718 case 'J':
719 flag_signed_overflow_ok = 1;
720 break;
722 #ifndef WORKING_DOT_WORD
723 case 'K':
724 flag_warn_displacement = 1;
725 break;
726 #endif
727 case 'L':
728 flag_keep_locals = 1;
729 break;
731 case OPTION_LISTING_LHS_WIDTH:
732 listing_lhs_width = atoi (optarg);
733 if (listing_lhs_width_second < listing_lhs_width)
734 listing_lhs_width_second = listing_lhs_width;
735 break;
736 case OPTION_LISTING_LHS_WIDTH2:
738 int tmp = atoi (optarg);
740 if (tmp > listing_lhs_width)
741 listing_lhs_width_second = tmp;
743 break;
744 case OPTION_LISTING_RHS_WIDTH:
745 listing_rhs_width = atoi (optarg);
746 break;
747 case OPTION_LISTING_CONT_LINES:
748 listing_lhs_cont_lines = atoi (optarg);
749 break;
751 case 'M':
752 flag_mri = 1;
753 #ifdef TC_M68K
754 flag_m68k_mri = 1;
755 #endif
756 break;
758 case 'R':
759 flag_readonly_data_in_text = 1;
760 break;
762 case 'W':
763 flag_no_warnings = 1;
764 break;
766 case OPTION_WARN:
767 flag_no_warnings = 0;
768 flag_fatal_warnings = 0;
769 break;
771 case OPTION_WARN_FATAL:
772 flag_no_warnings = 0;
773 flag_fatal_warnings = 1;
774 break;
776 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
777 case OPTION_EXECSTACK:
778 flag_execstack = 1;
779 flag_noexecstack = 0;
780 break;
782 case OPTION_NOEXECSTACK:
783 flag_noexecstack = 1;
784 flag_execstack = 0;
785 break;
786 #endif
787 case 'Z':
788 flag_always_generate_output = 1;
789 break;
791 case OPTION_AL:
792 listing |= LISTING_LISTING;
793 if (optarg)
794 listing_filename = xstrdup (optarg);
795 break;
797 case OPTION_ALTERNATE:
798 optarg = old_argv [optind - 1];
799 while (* optarg == '-')
800 optarg ++;
802 if (strcmp (optarg, "alternate") == 0)
804 flag_macro_alternate = 1;
805 break;
807 optarg ++;
808 /* Fall through. */
810 case 'a':
811 if (optarg)
813 if (optarg != old_argv[optind] && optarg[-1] == '=')
814 --optarg;
816 if (md_parse_option (optc, optarg) != 0)
817 break;
819 while (*optarg)
821 switch (*optarg)
823 case 'c':
824 listing |= LISTING_NOCOND;
825 break;
826 case 'd':
827 listing |= LISTING_NODEBUG;
828 break;
829 case 'g':
830 listing |= LISTING_GENERAL;
831 break;
832 case 'h':
833 listing |= LISTING_HLL;
834 break;
835 case 'l':
836 listing |= LISTING_LISTING;
837 break;
838 case 'm':
839 listing |= LISTING_MACEXP;
840 break;
841 case 'n':
842 listing |= LISTING_NOFORM;
843 break;
844 case 's':
845 listing |= LISTING_SYMBOLS;
846 break;
847 case '=':
848 listing_filename = xstrdup (optarg + 1);
849 optarg += strlen (listing_filename);
850 break;
851 default:
852 as_fatal (_("invalid listing option `%c'"), *optarg);
853 break;
855 optarg++;
858 if (!listing)
859 listing = LISTING_DEFAULT;
860 break;
862 case 'D':
863 /* DEBUG is implemented: it debugs different
864 things from other people's assemblers. */
865 flag_debug = 1;
866 break;
868 case 'f':
869 flag_no_comments = 1;
870 break;
872 case 'I':
873 { /* Include file directory. */
874 char *temp = xstrdup (optarg);
876 add_include_dir (temp);
877 break;
880 case 'o':
881 out_file_name = xstrdup (optarg);
882 break;
884 case 'w':
885 break;
887 case 'X':
888 /* -X means treat warnings as errors. */
889 break;
891 case OPTION_REDUCE_MEMORY_OVERHEADS:
892 /* The only change we make at the moment is to reduce
893 the size of the hash tables that we use. */
894 set_gas_hash_table_size (4051);
895 break;
897 case OPTION_HASH_TABLE_SIZE:
899 unsigned long new_size;
901 new_size = strtoul (optarg, NULL, 0);
902 if (new_size)
903 set_gas_hash_table_size (new_size);
904 else
905 as_fatal (_("--hash-size needs a numeric argument"));
906 break;
911 free (shortopts);
912 free (longopts);
914 *pargc = new_argc;
915 *pargv = new_argv;
917 #ifdef md_after_parse_args
918 md_after_parse_args ();
919 #endif
922 static void
923 dump_statistics (void)
925 #ifdef HAVE_SBRK
926 char *lim = (char *) sbrk (0);
927 #endif
928 long run_time = get_run_time () - start_time;
930 fprintf (stderr, _("%s: total time in assembly: %ld.%06ld\n"),
931 myname, run_time / 1000000, run_time % 1000000);
932 #ifdef HAVE_SBRK
933 fprintf (stderr, _("%s: data size %ld\n"),
934 myname, (long) (lim - (char *) &environ));
935 #endif
937 subsegs_print_statistics (stderr);
938 write_print_statistics (stderr);
939 symbol_print_statistics (stderr);
940 read_print_statistics (stderr);
942 #ifdef tc_print_statistics
943 tc_print_statistics (stderr);
944 #endif
946 #ifdef obj_print_statistics
947 obj_print_statistics (stderr);
948 #endif
951 #ifndef OBJ_VMS
952 static void
953 close_output_file (void)
955 output_file_close (out_file_name);
957 #endif
959 /* The interface between the macro code and gas expression handling. */
961 static int
962 macro_expr (const char *emsg, int idx, sb *in, int *val)
964 char *hold;
965 expressionS ex;
967 sb_terminate (in);
969 hold = input_line_pointer;
970 input_line_pointer = in->ptr + idx;
971 expression_and_evaluate (&ex);
972 idx = input_line_pointer - in->ptr;
973 input_line_pointer = hold;
975 if (ex.X_op != O_constant)
976 as_bad ("%s", emsg);
978 *val = (int) ex.X_add_number;
980 return idx;
983 /* Here to attempt 1 pass over each input file.
984 We scan argv[*] looking for filenames or exactly "" which is
985 shorthand for stdin. Any argv that is NULL is not a file-name.
986 We set need_pass_2 TRUE if, after this, we still have unresolved
987 expressions of the form (unknown value)+-(unknown value).
989 Note the un*x semantics: there is only 1 logical input file, but it
990 may be a catenation of many 'physical' input files. */
992 static void
993 perform_an_assembly_pass (int argc, char ** argv)
995 int saw_a_file = 0;
996 flagword applicable;
998 need_pass_2 = 0;
1000 /* Create the standard sections, and those the assembler uses
1001 internally. */
1002 text_section = subseg_new (TEXT_SECTION_NAME, 0);
1003 data_section = subseg_new (DATA_SECTION_NAME, 0);
1004 bss_section = subseg_new (BSS_SECTION_NAME, 0);
1005 /* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
1006 to have relocs, otherwise we don't find out in time. */
1007 applicable = bfd_applicable_section_flags (stdoutput);
1008 bfd_set_section_flags (stdoutput, text_section,
1009 applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1010 | SEC_CODE | SEC_READONLY));
1011 bfd_set_section_flags (stdoutput, data_section,
1012 applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1013 | SEC_DATA));
1014 bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
1015 seg_info (bss_section)->bss = 1;
1016 subseg_new (BFD_ABS_SECTION_NAME, 0);
1017 subseg_new (BFD_UND_SECTION_NAME, 0);
1018 reg_section = subseg_new ("*GAS `reg' section*", 0);
1019 expr_section = subseg_new ("*GAS `expr' section*", 0);
1021 subseg_set (text_section, 0);
1023 /* This may add symbol table entries, which requires having an open BFD,
1024 and sections already created. */
1025 md_begin ();
1027 #ifdef USING_CGEN
1028 gas_cgen_begin ();
1029 #endif
1030 #ifdef obj_begin
1031 obj_begin ();
1032 #endif
1034 /* Skip argv[0]. */
1035 argv++;
1036 argc--;
1038 while (argc--)
1040 if (*argv)
1041 { /* Is it a file-name argument? */
1042 PROGRESS (1);
1043 saw_a_file++;
1044 /* argv->"" if stdin desired, else->filename. */
1045 read_a_source_file (*argv);
1047 argv++; /* Completed that argv. */
1049 if (!saw_a_file)
1050 read_a_source_file ("");
1053 #ifdef OBJ_ELF
1054 static void
1055 create_obj_attrs_section (void)
1057 segT s;
1058 char *p;
1059 addressT addr;
1060 offsetT size;
1061 const char *name;
1063 size = bfd_elf_obj_attr_size (stdoutput);
1064 if (size)
1066 name = get_elf_backend_data (stdoutput)->obj_attrs_section;
1067 if (!name)
1068 name = ".gnu.attributes";
1069 s = subseg_new (name, 0);
1070 elf_section_type (s)
1071 = get_elf_backend_data (stdoutput)->obj_attrs_section_type;
1072 bfd_set_section_flags (stdoutput, s, SEC_READONLY | SEC_DATA);
1073 addr = frag_now_fix ();
1074 p = frag_more (size);
1075 bfd_elf_set_obj_attr_contents (stdoutput, (bfd_byte *)p, size);
1078 #endif
1082 main (int argc, char ** argv)
1084 char ** argv_orig = argv;
1086 int macro_strip_at;
1087 int keep_it;
1089 start_time = get_run_time ();
1091 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
1092 setlocale (LC_MESSAGES, "");
1093 #endif
1094 #if defined (HAVE_SETLOCALE)
1095 setlocale (LC_CTYPE, "");
1096 #endif
1097 bindtextdomain (PACKAGE, LOCALEDIR);
1098 textdomain (PACKAGE);
1100 if (debug_memory)
1101 chunksize = 64;
1103 #ifdef HOST_SPECIAL_INIT
1104 HOST_SPECIAL_INIT (argc, argv);
1105 #endif
1107 myname = argv[0];
1108 xmalloc_set_program_name (myname);
1110 expandargv (&argc, &argv);
1112 START_PROGRESS (myname, 0);
1114 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
1115 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
1116 #endif
1118 out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
1120 hex_init ();
1121 bfd_init ();
1122 bfd_set_error_program_name (myname);
1124 #ifdef USE_EMULATIONS
1125 select_emulation_mode (argc, argv);
1126 #endif
1128 PROGRESS (1);
1129 /* Call parse_args before any of the init/begin functions
1130 so that switches like --hash-size can be honored. */
1131 parse_args (&argc, &argv);
1132 symbol_begin ();
1133 frag_init ();
1134 subsegs_begin ();
1135 read_begin ();
1136 input_scrub_begin ();
1137 expr_begin ();
1139 #ifndef OBJ_VMS /* Does its own file handling. */
1140 /* It has to be called after dump_statistics (). */
1141 xatexit (close_output_file);
1142 #endif
1144 if (flag_print_statistics)
1145 xatexit (dump_statistics);
1147 macro_strip_at = 0;
1148 #ifdef TC_I960
1149 macro_strip_at = flag_mri;
1150 #endif
1152 macro_init (flag_macro_alternate, flag_mri, macro_strip_at, macro_expr);
1154 PROGRESS (1);
1156 output_file_create (out_file_name);
1157 assert (stdoutput != 0);
1159 #ifdef tc_init_after_args
1160 tc_init_after_args ();
1161 #endif
1163 itbl_init ();
1165 /* Now that we have fully initialized, and have created the output
1166 file, define any symbols requested by --defsym command line
1167 arguments. */
1168 while (defsyms != NULL)
1170 symbolS *sym;
1171 struct defsym_list *next;
1173 sym = symbol_new (defsyms->name, absolute_section, defsyms->value,
1174 &zero_address_frag);
1175 /* Make symbols defined on the command line volatile, so that they
1176 can be redefined inside a source file. This makes this assembler's
1177 behaviour compatible with earlier versions, but it may not be
1178 completely intuitive. */
1179 S_SET_VOLATILE (sym);
1180 symbol_table_insert (sym);
1181 next = defsyms->next;
1182 free (defsyms);
1183 defsyms = next;
1186 PROGRESS (1);
1188 /* Assemble it. */
1189 perform_an_assembly_pass (argc, argv);
1191 cond_finish_check (-1);
1193 #ifdef md_end
1194 md_end ();
1195 #endif
1197 #ifdef OBJ_ELF
1198 if (IS_ELF)
1199 create_obj_attrs_section ();
1200 #endif
1202 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
1203 if ((flag_execstack || flag_noexecstack)
1204 && OUTPUT_FLAVOR == bfd_target_elf_flavour)
1206 segT gnustack;
1208 gnustack = subseg_new (".note.GNU-stack", 0);
1209 bfd_set_section_flags (stdoutput, gnustack,
1210 SEC_READONLY | (flag_execstack ? SEC_CODE : 0));
1213 #endif
1215 /* If we've been collecting dwarf2 .debug_line info, either for
1216 assembly debugging or on behalf of the compiler, emit it now. */
1217 dwarf2_finish ();
1219 /* If we constructed dwarf2 .eh_frame info, either via .cfi
1220 directives from the user or by the backend, emit it now. */
1221 cfi_finish ();
1223 if (seen_at_least_1_file ()
1224 && (flag_always_generate_output || had_errors () == 0))
1225 keep_it = 1;
1226 else
1227 keep_it = 0;
1229 /* This used to be done at the start of write_object_file in
1230 write.c, but that caused problems when doing listings when
1231 keep_it was zero. This could probably be moved above md_end, but
1232 I didn't want to risk the change. */
1233 subsegs_finish ();
1235 if (keep_it)
1236 write_object_file ();
1238 fflush (stderr);
1240 #ifndef NO_LISTING
1241 listing_print (listing_filename, argv_orig);
1242 #endif
1244 if (flag_fatal_warnings && had_warnings () > 0 && had_errors () == 0)
1245 as_bad (_("%d warnings, treating warnings as errors"), had_warnings ());
1247 if (had_errors () > 0 && ! flag_always_generate_output)
1248 keep_it = 0;
1250 if (!keep_it)
1251 unlink_if_ordinary (out_file_name);
1253 input_scrub_end ();
1255 END_PROGRESS (myname);
1257 /* Use xexit instead of return, because under VMS environments they
1258 may not place the same interpretation on the value given. */
1259 if (had_errors () > 0)
1260 xexit (EXIT_FAILURE);
1262 /* Only generate dependency file if assembler was successful. */
1263 print_dependencies ();
1265 xexit (EXIT_SUCCESS);