gas/as.c

   1 /* as.c - GAS main program.
   2    Copyright (C) 1987, 1990, 1991 Free Software Foundation, Inc.
   3
   4    This file is part of GAS, the GNU Assembler.
   5
   6    GAS is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    GAS is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with GAS; see the file COPYING.  If not, write to
  18    the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
  19
  20 /*
  21  * Main program for AS; a 32-bit assembler of GNU.
  22  * Understands command arguments.
  23  * Has a few routines that don't fit in other modules because they
  24  * are shared.
  25  *
  26  *
  27  *                      bugs
  28  *
  29  * : initialisers
  30  *      Since no-one else says they will support them in future: I
  31  * don't support them now.
  32  *
  33  */
  34
  35 #include <stdio.h>
  36 #include <string.h>
  37
  38 #ifdef _POSIX_SOURCE
  39 #include <sys/types.h>  /* For pid_t in signal.h */
  40 #endif
  41 #include <signal.h>
  42
  43 #define COMMON
  44
  45 #include "as.h"
  46 #include "subsegs.h"
  47 #ifdef __STDC__
  48
  49 /* This prototype for got_sig() is ansi.  If you want
  50    anything else, then your compiler is lying to you when
  51    it says that it is __STDC__.  If you want to change it,
  52    #ifdef protect it from those of us with real ansi
  53    compilers. */
  54
  55 #define SIGTY void
  56
  57 static void got_sig(int sig);
  58 static char *stralloc(char *str);
  59 static void perform_an_assembly_pass(int argc, char **argv);
  60
  61 #else /* __STDC__ */
  62
  63 #ifndef SIGTY
  64 #define SIGTY int
  65 #endif
  66
  67 static SIGTY got_sig();
  68 static char *stralloc();        /* Make a (safe) copy of a string. */
  69 static void perform_an_assembly_pass();
  70
  71 #endif /* __STDC__ */
  72
  73 #ifdef DONTDEF
  74 static char * gdb_symbol_file_name;
  75 long gdb_begin();
  76 #endif
  77
  78 int listing; /* true if a listing is wanted */
  79
  80 char *myname;           /* argv[0] */
  81 extern char version_string[];
  82 \f
  83 int main(argc,argv)
  84 int argc;
  85 char **argv;
  86 {
  87         int work_argc;  /* variable copy of argc */
  88         char **work_argv;       /* variable copy of argv */
  89         char *arg;              /* an arg to program */
  90         char a;         /* an arg flag (after -) */
  91         static const int sig[] = { SIGHUP, SIGINT, SIGPIPE, SIGTERM, 0};
  92
  93         for(a=0;sig[a]!=0;a++)
  94             if(signal(sig[a], SIG_IGN) != SIG_IGN)
  95                 signal(sig[a], got_sig);
  96
  97         myname=argv[0];
  98         bzero (flagseen, sizeof(flagseen)); /* aint seen nothing yet */
  99 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
 100 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
 101 #endif /* OBJ_DEFAULT_OUTPUT_FILE_NAME */
 102         out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
 103
 104         symbol_begin();         /* symbols.c */
 105         subsegs_begin();                /* subsegs.c */
 106         read_begin();                   /* read.c */
 107         md_begin();                     /* MACHINE.c */
 108         input_scrub_begin();            /* input_scrub.c */
 109 #ifdef DONTDEF
 110         gdb_symbol_file_name = 0;
 111 #endif
 112         /*
 113          * Parse arguments, but we are only interested in flags.
 114          * When we find a flag, we process it then make it's argv[] NULL.
 115          * This helps any future argv[] scanners avoid what we processed.
 116          * Since it is easy to do here we interpret the special arg "-"
 117          * to mean "use stdin" and we set that argv[] pointing to "".
 118          * After we have munged argv[], the only things left are source file
 119          * name(s) and ""(s) denoting stdin. These file names are used
 120          * (perhaps more than once) later.
 121          */
 122         /* FIXME-SOMEDAY this should use getopt. */
 123         work_argc = argc-1;             /* don't count argv[0] */
 124         work_argv = argv+1;             /* skip argv[0] */
 125         for (;work_argc--;work_argv++) {
 126                 arg = * work_argv;      /* work_argv points to this argument */
 127
 128                 if (*arg!='-')          /* Filename. We need it later. */
 129                     continue;   /* Keep scanning args looking for flags. */
 130                 if (arg[1] == '-' && arg[2] == 0) {
 131                         /* "--" as an argument means read STDIN */
 132                         /* on this scan, we don't want to think about filenames */
 133                         * work_argv = "";       /* Code that means 'use stdin'. */
 134                         continue;
 135                 }
 136                 /* This better be a switch. */
 137                 arg ++;         /*->letter. */
 138
 139                 while ((a = * arg) != '\0')  {/* scan all the 1-char flags */
 140                         arg ++; /* arg->after letter. */
 141                         a &= 0x7F;      /* ascii only please */
 142                         /* if (flagseen[a])
 143                            as_tsktsk("%s: Flag option - %c has already been seen.", myname, a); */
 144                         flagseen[a] = 1;
 145                         switch (a) {
 146
 147                         case 'a':
 148                                 {
 149                                         int loop =1;
 150
 151                                         while (loop) {
 152                                                 switch (*arg)
 153                                                     {
 154                                                     case 'l':
 155                                                             listing |= LISTING_LISTING;
 156                                                             arg++;
 157                                                             break;
 158                                                     case 's':
 159                                                             listing |= LISTING_SYMBOLS;
 160                                                             arg++;
 161                                                             break;
 162                                                     case 'h':
 163                                                             listing |= LISTING_HLL;
 164                                                             arg++;
 165                                                             break;
 166
 167                                                     case 'n':
 168                                                             listing |= LISTING_NOFORM;
 169                                                             arg++;
 170                                                             break;
 171                                                     case 'd':
 172                                                             listing |= LISTING_NODEBUG;
 173                                                             arg++;
 174                                                             break;
 175                                                     default:
 176                                                             if (!listing)
 177                                                                 listing= LISTING_DEFAULT;
 178                                                             loop = 0;
 179                                                             break;
 180                                                     }
 181                                         }
 182                                 }
 183
 184                                 break;
 185
 186
 187                         case 'f':
 188                                 break;  /* -f means fast - no need for "app" preprocessor. */
 189
 190                         case 'D':
 191                                 /* DEBUG is implemented: it debugs different */
 192                                 /* things to other people's assemblers. */
 193                                 break;
 194
 195 #ifdef DONTDEF
 196                         case 'G':       /* GNU AS switch: include gdbsyms. */
 197                                 if (*arg)       /* Rest of argument is file-name. */
 198                                     gdb_symbol_file_name = stralloc (arg);
 199                                 else if (work_argc) {   /* Next argument is file-name. */
 200                                         work_argc --;
 201                                         * work_argv = NULL; /* Not a source file-name. */
 202                                         gdb_symbol_file_name = * ++ work_argv;
 203                                 } else
 204                                     as_warn("%s: I expected a filename after -G", myname);
 205                                 arg = "";       /* Finished with this arg. */
 206                                 break;
 207 #endif
 208
 209                         case 'I': { /* Include file directory */
 210
 211                                 char *temp = NULL;
 212                                 if (*arg)
 213                                     temp = stralloc (arg);
 214                                 else if (work_argc) {
 215                                         * work_argv = NULL;
 216                                         work_argc--;
 217                                         temp = * ++ work_argv;
 218                                 } else
 219                                     as_warn("%s: I expected a filename after -I", myname);
 220                                 add_include_dir (temp);
 221                                 arg = "";       /* Finished with this arg. */
 222                                 break;
 223                         }
 224
 225 #ifndef WORKING_DOT_WORD
 226                         case 'k':
 227                                 break;
 228 #endif
 229
 230                         case 'L': /* -L means keep L* symbols */
 231                                 break;
 232
 233                         case 'o':
 234                                 if (*arg)       /* Rest of argument is object file-name. */
 235                                     out_file_name = stralloc (arg);
 236                                 else if (work_argc) {   /* Want next arg for a file-name. */
 237                                         * work_argv = NULL; /* This is not a file-name. */
 238                                         work_argc--;
 239                                         out_file_name = * ++ work_argv;
 240                                 } else
 241                                     as_warn("%s: I expected a filename after -o. \"%s\" assumed.", myname, out_file_name);
 242                                 arg = "";       /* Finished with this arg. */
 243                                 break;
 244
 245                         case 'R':
 246                                 /* -R means put data into text segment */
 247                                 break;
 248
 249                         case 'v':
 250 #ifdef  VMS
 251                                 {
 252                                         extern char *compiler_version_string;
 253                                         compiler_version_string = arg;
 254                                 }
 255 #else /* not VMS */
 256                                 fprintf(stderr,version_string);
 257                                 if(*arg && strcmp(arg,"ersion"))
 258                                     as_warn("Unknown -v option ignored");
 259 #endif
 260                                 while(*arg) arg++;      /* Skip the rest */
 261                                 break;
 262
 263                         case 'W':
 264                                 /* -W means don't warn about things */
 265                         case 'X':
 266                                 /* -X means treat warnings as errors */
 267                         case 'Z':
 268                                 /* -Z means attempt to generate object file even after errors. */
 269                                 break;
 270
 271                         default:
 272                                 --arg;
 273                                 if(md_parse_option(&arg,&work_argc,&work_argv)==0)
 274                                     as_warn("%s: I don't understand '%c' flag.", myname, a);
 275                                 if(arg && *arg)
 276                                     arg++;
 277                                 break;
 278                         }
 279                 }
 280                 /*
 281                  * We have just processed a "-..." arg, which was not a
 282                  * file-name. Smash it so the
 283                  * things that look for filenames won't ever see it.
 284                  *
 285                  * Whatever work_argv points to, it has already been used
 286                  * as part of a flag, so DON'T re-use it as a filename.
 287                  */
 288                 *work_argv = NULL; /* NULL means 'not a file-name' */
 289         }
 290 #ifdef DONTDEF
 291         if (gdb_begin(gdb_symbol_file_name) == 0)
 292             flagseen ['G'] = 0; /* Don't do any gdbsym stuff. */
 293 #endif
 294         /* Here with flags set up in flagseen[]. */
 295         perform_an_assembly_pass(argc,argv); /* Assemble it. */
 296 #ifdef TC_I960
 297         brtab_emit();
 298 #endif
 299         if (seen_at_least_1_file()
 300             && !((had_warnings() && flagseen['Z'])
 301                  || had_errors() > 0)) {
 302                 write_object_file(); /* relax() addresses then emit object file */
 303         } /* we also check in write_object_file() just before emit. */
 304
 305         input_scrub_end();
 306         md_end();                       /* MACHINE.c */
 307
 308 #ifndef NO_LISTING
 309         listing_print();
 310 #endif
 311
 312 #ifndef VMS
 313         return((had_warnings() && flagseen['Z'])
 314                || had_errors() > 0);                    /* WIN */
 315 #else   /* VMS */
 316         return(!((had_warnings() && flagseen['Z'])
 317                  || had_errors() > 0));                 /* WIN */
 318 #endif  /* VMS */
 319
 320 } /* main() */
 321
 322 \f
 323 /*                      perform_an_assembly_pass()
 324  *
 325  * Here to attempt 1 pass over each input file.
 326  * We scan argv[*] looking for filenames or exactly "" which is
 327  * shorthand for stdin. Any argv that is NULL is not a file-name.
 328  * We set need_pass_2 TRUE if, after this, we still have unresolved
 329  * expressions of the form (unknown value)+-(unknown value).
 330  *
 331  * Note the un*x semantics: there is only 1 logical input file, but it
 332  * may be a catenation of many 'physical' input files.
 333  */
 334 static void perform_an_assembly_pass(argc, argv)
 335 int argc;
 336 char **argv;
 337 {
 338         int saw_a_file = 0;
 339         unsigned int i;
 340         need_pass_2             = 0;
 341
 342 #ifdef MANY_SEGMENTS
 343
 344         for (i= SEG_E0; i < SEG_UNKNOWN; i++)
 345             {
 346                     segment_info[i].fix_root = 0;
 347             }
 348         /* Create the three fixed ones */
 349         subseg_new (SEG_E0, 0);
 350         subseg_new (SEG_E1, 0);
 351         subseg_new (SEG_E2, 0);
 352         strcpy(segment_info[SEG_E0].scnhdr.s_name,".text");
 353         strcpy(segment_info[SEG_E1].scnhdr.s_name,".data");
 354         strcpy(segment_info[SEG_E2].scnhdr.s_name,".bss");
 355
 356         subseg_new (SEG_E0, 0);
 357 #else
 358         text_fix_root           = NULL;
 359         data_fix_root           = NULL;
 360
 361         subseg_new (SEG_TEXT, 0);
 362 #endif
 363         argv++; /* skip argv[0] */
 364         argc--; /* skip argv[0] */
 365         while (argc--) {
 366                 if (*argv) { /* Is it a file-name argument? */
 367                         saw_a_file++;
 368                         /* argv->"" if stdin desired, else->filename */
 369                         read_a_source_file(*argv);
 370                 }
 371                 argv++; /* completed that argv */
 372         }
 373         if(!saw_a_file)
 374             read_a_source_file("");
 375 } /* perform_an_assembly_pass() */
 376 \f
 377 /*
 378  *                      stralloc()
 379  *
 380  * Allocate memory for a new copy of a string. Copy the string.
 381  * Return the address of the new string. Die if there is any error.
 382  */
 383
 384 static char *
 385     stralloc (str)
 386 char *  str;
 387 {
 388         register char * retval;
 389         register long len;
 390
 391         len = strlen (str) + 1;
 392         retval = xmalloc (len);
 393         (void) strcpy(retval, str);
 394         return(retval);
 395 }
 396 \f
 397 #ifdef comment
 398 static void lose() {
 399         as_fatal("%s: 2nd pass not implemented - get your code from random(3)", myname);
 400         return;
 401 } /* lose() */
 402 #endif /* comment */
 403
 404 static SIGTY
 405     got_sig(sig)
 406 int sig;
 407 {
 408         static here_before = 0;
 409
 410         as_bad("Interrupted by signal %d", sig);
 411         if(here_before++)
 412             exit(1);
 413         return((SIGTY) 0);
 414 }
 415
 416 /*
 417  * Local Variables:
 418  * comment-column: 0
 419  * fill-column: 131
 420  * End:
 421  */
 422
 423 /* end of as.c */