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 1, 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
  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 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                         case 'f':
 147                                 break;  /* -f means fast - no need for "app" preprocessor. */
 148
 149                         case 'D':
 150                                 /* DEBUG is implemented: it debugs different */
 151                                 /* things to other people's assemblers. */
 152                                 break;
 153
 154 #ifdef DONTDEF
 155                         case 'G':       /* GNU AS switch: include gdbsyms. */
 156                                 if (*arg)       /* Rest of argument is file-name. */
 157                                         gdb_symbol_file_name = stralloc (arg);
 158                                 else if (work_argc) {   /* Next argument is file-name. */
 159                                         work_argc --;
 160                                         * work_argv = NULL; /* Not a source file-name. */
 161                                         gdb_symbol_file_name = * ++ work_argv;
 162                                 } else
 163                                         as_warn("%s: I expected a filename after -G", myname);
 164                                 arg = "";       /* Finished with this arg. */
 165                                 break;
 166 #endif
 167
 168                         case 'I': { /* Include file directory */
 169
 170                                 char *temp;
 171                                 if (*arg)
 172                                     temp = stralloc (arg);
 173                                 else if (work_argc) {
 174                                         * work_argv = NULL;
 175                                         work_argc--;
 176                                         temp = * ++ work_argv;
 177                                 } else
 178                                     as_warn("%s: I expected a filename after -I", myname);
 179                                 add_include_dir (temp);
 180                                 arg = "";       /* Finished with this arg. */
 181                                 break;
 182                         }
 183
 184 #ifndef WORKING_DOT_WORD
 185                         case 'k':
 186                                 break;
 187 #endif
 188
 189                         case 'L': /* -L means keep L* symbols */
 190                                 break;
 191
 192                         case 'o':
 193                                 if (*arg)       /* Rest of argument is object file-name. */
 194                                         out_file_name = stralloc (arg);
 195                                 else if (work_argc) {   /* Want next arg for a file-name. */
 196                                         * work_argv = NULL; /* This is not a file-name. */
 197                                         work_argc--;
 198                                         out_file_name = * ++ work_argv;
 199                                 } else
 200                                         as_warn("%s: I expected a filename after -o. \"%s\" assumed.", myname, out_file_name);
 201                                 arg = "";       /* Finished with this arg. */
 202                                 break;
 203
 204                         case 'R':
 205                                 /* -R means put data into text segment */
 206                                 break;
 207
 208                         case 'v':
 209 #ifdef  VMS
 210                                 {
 211                                 extern char *compiler_version_string;
 212                                 compiler_version_string = arg;
 213                                 }
 214 #else /* not VMS */
 215                                 fprintf(stderr,version_string);
 216                                 if(*arg && strcmp(arg,"ersion"))
 217                                         as_warn("Unknown -v option ignored");
 218 #endif
 219                                 while(*arg) arg++;      /* Skip the rest */
 220                                 break;
 221
 222                         case 'W':
 223                                 /* -W means don't warn about things */
 224                         case 'X':
 225                                 /* -X means treat warnings as errors */
 226                         case 'Z':
 227                                 /* -Z means attempt to generate object file even after errors. */
 228                                 break;
 229
 230                         default:
 231                                 --arg;
 232                                 if(md_parse_option(&arg,&work_argc,&work_argv)==0)
 233                                         as_warn("%s: I don't understand '%c' flag.", myname, a);
 234                                 if(arg && *arg)
 235                                         arg++;
 236                                 break;
 237                         }
 238                 }
 239                 /*
 240                  * We have just processed a "-..." arg, which was not a
 241                  * file-name. Smash it so the
 242                  * things that look for filenames won't ever see it.
 243                  *
 244                  * Whatever work_argv points to, it has already been used
 245                  * as part of a flag, so DON'T re-use it as a filename.
 246                  */
 247                 *work_argv = NULL; /* NULL means 'not a file-name' */
 248         }
 249 #ifdef DONTDEF
 250         if (gdb_begin(gdb_symbol_file_name) == 0)
 251                 flagseen ['G'] = 0;     /* Don't do any gdbsym stuff. */
 252 #endif
 253         /* Here with flags set up in flagseen[]. */
 254         perform_an_assembly_pass(argc,argv); /* Assemble it. */
 255 #ifdef TC_I960
 256         brtab_emit();
 257 #endif
 258         if (seen_at_least_1_file()
 259             && !((had_warnings() && flagseen['Z'])
 260                  || had_errors() > 0)) {
 261                 write_object_file(); /* relax() addresses then emit object file */
 262         } /* we also check in write_object_file() just before emit. */
 263
 264         input_scrub_end();
 265         md_end();                       /* MACHINE.c */
 266
 267 #ifndef VMS
 268         return((had_warnings() && flagseen['Z'])
 269                || had_errors() > 0);                    /* WIN */
 270 #else   /* VMS */
 271         return(!((had_warnings() && flagseen['Z'])
 272                  || had_errors() > 0));                 /* WIN */
 273 #endif  /* VMS */
 274
 275 } /* main() */
 276
 277 \f
 278 /*                      perform_an_assembly_pass()
 279  *
 280  * Here to attempt 1 pass over each input file.
 281  * We scan argv[*] looking for filenames or exactly "" which is
 282  * shorthand for stdin. Any argv that is NULL is not a file-name.
 283  * We set need_pass_2 TRUE if, after this, we still have unresolved
 284  * expressions of the form (unknown value)+-(unknown value).
 285  *
 286  * Note the un*x semantics: there is only 1 logical input file, but it
 287  * may be a catenation of many 'physical' input files.
 288  */
 289 static void perform_an_assembly_pass(argc, argv)
 290 int argc;
 291 char **argv;
 292 {
 293         int saw_a_file = 0;
 294
 295         text_fix_root           = NULL;
 296         data_fix_root           = NULL;
 297         need_pass_2             = 0;
 298
 299         subseg_new (SEG_TEXT, 0);
 300
 301         argv++;                 /* skip argv[0] */
 302         argc--;                 /* skip argv[0] */
 303         while (argc--) {
 304                 if (*argv) {            /* Is it a file-name argument? */
 305                         saw_a_file++;
 306                         /* argv->"" if stdin desired, else->filename */
 307                         read_a_source_file(*argv);
 308                 }
 309                 argv++;                 /* completed that argv */
 310         }
 311         if(!saw_a_file)
 312                 read_a_source_file("");
 313 } /* perform_an_assembly_pass() */
 314 \f
 315 /*
 316  *                      stralloc()
 317  *
 318  * Allocate memory for a new copy of a string. Copy the string.
 319  * Return the address of the new string. Die if there is any error.
 320  */
 321
 322 static char *
 323 stralloc (str)
 324 char *  str;
 325 {
 326         register char * retval;
 327         register long len;
 328
 329         len = strlen (str) + 1;
 330         retval = xmalloc (len);
 331         (void) strcpy(retval, str);
 332         return(retval);
 333 }
 334 \f
 335 #ifdef comment
 336 static void lose() {
 337         as_fatal("%s: 2nd pass not implemented - get your code from random(3)", myname);
 338         return;
 339 } /* lose() */
 340 #endif /* comment */
 341
 342 static SIGTY
 343 got_sig(sig)
 344 int sig;
 345 {
 346         static here_before = 0;
 347
 348         as_bad("Interrupted by signal %d", sig);
 349         if(here_before++)
 350                 exit(1);
 351         return((SIGTY) 0);
 352 }
 353
 354 /*
 355  * Local Variables:
 356  * comment-column: 0
 357  * fill-column: 131
 358  * End:
 359  */
 360
 361 /* end: as.c */