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