old-autovect-branch/gcc/fortran/options.c

   1 /* Parse and display command line options.
   2    Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation,
   3    Inc.
   4    Contributed by Andy Vaught
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 2, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING.  If not, write to the Free
  20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  21 02110-1301, USA.  */
  22
  23
  24 #include "config.h"
  25 #include "system.h"
  26 #include "coretypes.h"
  27 #include "tree.h"
  28 #include "flags.h"
  29 #include "intl.h"
  30 #include "opts.h"
  31 #include "options.h"
  32 #include "tree-inline.h"
  33
  34 #include "gfortran.h"
  35 #include "target.h"
  36
  37 gfc_option_t gfc_option;
  38
  39
  40 /* Get ready for options handling.  */
  41
  42 unsigned int
  43 gfc_init_options (unsigned int argc ATTRIBUTE_UNUSED,
  44                   const char **argv ATTRIBUTE_UNUSED)
  45 {
  46   gfc_source_file = NULL;
  47   gfc_option.module_dir = NULL;
  48   gfc_option.source_form = FORM_UNKNOWN;
  49   gfc_option.fixed_line_length = -1;
  50   gfc_option.free_line_length = -1;
  51   gfc_option.max_identifier_length = GFC_MAX_SYMBOL_LEN;
  52   gfc_option.verbose = 0;
  53
  54   gfc_option.warn_aliasing = 0;
  55   gfc_option.warn_conversion = 0;
  56   gfc_option.warn_implicit_interface = 0;
  57   gfc_option.warn_line_truncation = 0;
  58   gfc_option.warn_underflow = 1;
  59   gfc_option.warn_surprising = 0;
  60   gfc_option.warn_unused_labels = 0;
  61
  62   gfc_option.flag_default_double = 0;
  63   gfc_option.flag_default_integer = 0;
  64   gfc_option.flag_default_real = 0;
  65   gfc_option.flag_dollar_ok = 0;
  66   gfc_option.flag_underscoring = 1;
  67   gfc_option.flag_f2c = 0;
  68   gfc_option.flag_second_underscore = -1;
  69   gfc_option.flag_implicit_none = 0;
  70   gfc_option.flag_max_stack_var_size = 32768;
  71   gfc_option.flag_module_access_private = 0;
  72   gfc_option.flag_no_backend = 0;
  73   gfc_option.flag_pack_derived = 0;
  74   gfc_option.flag_repack_arrays = 0;
  75   gfc_option.flag_automatic = 1;
  76   gfc_option.flag_backslash = 1;
  77   gfc_option.flag_cray_pointer = 0;
  78   gfc_option.flag_d_lines = -1;
  79
  80   gfc_option.q_kind = gfc_default_double_kind;
  81
  82   gfc_option.fpe = 0;
  83
  84   flag_argument_noalias = 2;
  85   flag_errno_math = 0;
  86
  87   gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
  88     | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F77 | GFC_STD_GNU
  89     | GFC_STD_LEGACY;
  90   gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
  91     | GFC_STD_F2003 | GFC_STD_LEGACY;
  92
  93   gfc_option.warn_nonstd_intrinsics = 0;
  94
  95   /* -fshort-enums can be default on some targets.  */
  96   gfc_option.fshort_enums = targetm.default_short_enums ();
  97
  98   return CL_Fortran;
  99 }
 100
 101
 102 /* Determine the source form from the filename extension.  We assume
 103    case insensitivity.  */
 104
 105 static gfc_source_form
 106 form_from_filename (const char *filename)
 107 {
 108
 109   static const struct
 110   {
 111     const char *extension;
 112     gfc_source_form form;
 113   }
 114   exttype[] =
 115   {
 116     {
 117     ".f90", FORM_FREE}
 118     ,
 119     {
 120     ".f95", FORM_FREE}
 121     ,
 122     {
 123     ".f", FORM_FIXED}
 124     ,
 125     {
 126     ".for", FORM_FIXED}
 127     ,
 128     {
 129     "", FORM_UNKNOWN}
 130   };            /* sentinel value */
 131
 132   gfc_source_form f_form;
 133   const char *fileext;
 134   int i;
 135
 136   /* Find end of file name.  Note, filename is either a NULL pointer or
 137      a NUL terminated string.  */
 138   i = 0;
 139   while (filename[i] != '\0')
 140     i++;
 141
 142   /* Find last period.  */
 143   while (i >= 0 && (filename[i] != '.'))
 144     i--;
 145
 146   /* Did we see a file extension?  */
 147   if (i < 0)
 148     return FORM_UNKNOWN; /* Nope  */
 149
 150   /* Get file extension and compare it to others.  */
 151   fileext = &(filename[i]);
 152
 153   i = -1;
 154   f_form = FORM_UNKNOWN;
 155   do
 156     {
 157       i++;
 158       if (strcasecmp (fileext, exttype[i].extension) == 0)
 159         {
 160           f_form = exttype[i].form;
 161           break;
 162         }
 163     }
 164   while (exttype[i].form != FORM_UNKNOWN);
 165
 166   return f_form;
 167 }
 168
 169
 170 /* Finalize commandline options.  */
 171
 172 bool
 173 gfc_post_options (const char **pfilename)
 174 {
 175   const char *filename = *pfilename;
 176   char *source_path;
 177   int i;
 178
 179   /* Verify the input file name.  */
 180   if (!filename || strcmp (filename, "-") == 0)
 181     {
 182       filename = "";
 183     }
 184
 185   gfc_source_file = filename;
 186
 187   /* Adds the path where the source file is to the list of include files.  */
 188
 189   i = strlen(gfc_source_file);
 190   while (i > 0 && !IS_DIR_SEPARATOR(gfc_source_file[i]))
 191     i--;
 192   if (i != 0)
 193     {
 194       source_path = alloca (i + 1);
 195       memcpy (source_path, gfc_source_file, i);
 196       source_path[i] = 0;
 197       gfc_add_include_path (source_path);
 198     }
 199   else
 200     gfc_add_include_path (".");
 201
 202   /* Decide which form the file will be read in as.  */
 203
 204   if (gfc_option.source_form != FORM_UNKNOWN)
 205     gfc_current_form = gfc_option.source_form;
 206   else
 207     {
 208       gfc_current_form = form_from_filename (filename);
 209
 210       if (gfc_current_form == FORM_UNKNOWN)
 211         {
 212           gfc_current_form = FORM_FREE;
 213           gfc_warning_now ("Reading file '%s' as free form.",
 214                            (filename[0] == '\0') ? "<stdin>" : filename);
 215         }
 216     }
 217
 218   /* If the user specified -fd-lines-as-{code|comments} verify that we're
 219      in fixed form.  */
 220   if (gfc_current_form == FORM_FREE)
 221     {
 222       if (gfc_option.flag_d_lines == 0)
 223         gfc_warning_now ("'-fd-lines-as-comments' has no effect "
 224                          "in free form.");
 225       else if (gfc_option.flag_d_lines == 1)
 226         gfc_warning_now ("'-fd-lines-as-code' has no effect "
 227                          "in free form.");
 228     }
 229
 230   flag_inline_trees = 1;
 231
 232   /* Use tree inlining.  */
 233   if (!flag_no_inline)
 234     flag_no_inline = 1;
 235   if (flag_inline_functions)
 236     flag_inline_trees = 2;
 237
 238   /* If -pedantic, warn about the use of GNU extensions.  */
 239   if (pedantic && (gfc_option.allow_std & GFC_STD_GNU) != 0)
 240     gfc_option.warn_std |= GFC_STD_GNU;
 241   /* -std=legacy -pedantic is effectively -std=gnu.  */
 242   if (pedantic && (gfc_option.allow_std & GFC_STD_LEGACY) != 0)
 243     gfc_option.warn_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL | GFC_STD_LEGACY;
 244
 245   /* If the user didn't explicitly specify -f(no)-second-underscore we
 246      use it if we're trying to be compatible with f2c, and not
 247      otherwise.  */
 248   if (gfc_option.flag_second_underscore == -1)
 249     gfc_option.flag_second_underscore = gfc_option.flag_f2c;
 250
 251   /* Implement -fno-automatic as -fmax-stack-var-size=0.  */
 252   if (!gfc_option.flag_automatic)
 253     gfc_option.flag_max_stack_var_size = 0;
 254
 255   return false;
 256 }
 257
 258
 259 /* Set the options for -Wall.  */
 260
 261 static void
 262 set_Wall (void)
 263 {
 264
 265   gfc_option.warn_aliasing = 1;
 266   gfc_option.warn_line_truncation = 1;
 267   gfc_option.warn_underflow = 1;
 268   gfc_option.warn_surprising = 1;
 269   gfc_option.warn_unused_labels = 1;
 270   gfc_option.warn_nonstd_intrinsics = 1;
 271
 272   set_Wunused (1);
 273   warn_return_type = 1;
 274   warn_switch = 1;
 275
 276   /* We save the value of warn_uninitialized, since if they put
 277      -Wuninitialized on the command line, we need to generate a
 278      warning about not using it without also specifying -O.  */
 279
 280   if (warn_uninitialized != 1)
 281     warn_uninitialized = 2;
 282 }
 283
 284
 285 static void
 286 gfc_handle_module_path_options (const char *arg)
 287 {
 288
 289   if (gfc_option.module_dir != NULL)
 290     {
 291       gfc_status ("gfortran: Only one -M option allowed\n");
 292       exit (3);
 293     }
 294
 295   if (arg == NULL)
 296     {
 297       gfc_status ("gfortran: Directory required after -M\n");
 298       exit (3);
 299     }
 300
 301   gfc_option.module_dir = (char *) gfc_getmem (strlen (arg) + 2);
 302   strcpy (gfc_option.module_dir, arg);
 303   strcat (gfc_option.module_dir, "/");
 304 }
 305
 306 static void
 307 gfc_handle_fpe_trap_option (const char *arg)
 308 {
 309   int result, pos = 0, n;
 310   static const char * const exception[] = { "invalid", "denormal", "zero",
 311                                             "overflow", "underflow",
 312                                             "precision", NULL };
 313   static const int opt_exception[] = { GFC_FPE_INVALID, GFC_FPE_DENORMAL,
 314                                        GFC_FPE_ZERO, GFC_FPE_OVERFLOW,
 315                                        GFC_FPE_UNDERFLOW, GFC_FPE_PRECISION,
 316                                        0 };
 317
 318   while (*arg)
 319     {
 320       while (*arg == ',')
 321         arg++;
 322       while (arg[pos] && arg[pos] != ',')
 323         pos++;
 324       result = 0;
 325       for (n = 0; exception[n] != NULL; n++)
 326         {
 327           if (exception[n] && strncmp (exception[n], arg, pos) == 0)
 328             {
 329               gfc_option.fpe |= opt_exception[n];
 330               arg += pos;
 331               pos = 0;
 332               result = 1;
 333               break;
 334             }
 335         }
 336       if (! result)
 337         gfc_fatal_error ("Argument to -ffpe-trap is not valid: %s", arg);
 338     }
 339 }
 340
 341 /* Handle command-line options.  Returns 0 if unrecognized, 1 if
 342    recognized and handled.  */
 343 int
 344 gfc_handle_option (size_t scode, const char *arg, int value)
 345 {
 346   int result = 1;
 347   enum opt_code code = (enum opt_code) scode;
 348
 349   /* Ignore file names.  */
 350   if (code == N_OPTS)
 351     return 1;
 352
 353   switch (code)
 354     {
 355     default:
 356       result = 0;
 357       break;
 358
 359     case OPT_Wall:
 360       set_Wall ();
 361       break;
 362
 363     case OPT_Waliasing:
 364       gfc_option.warn_aliasing = value;
 365       break;
 366
 367     case OPT_Wconversion:
 368       gfc_option.warn_conversion = value;
 369       break;
 370
 371     case OPT_Wimplicit_interface:
 372       gfc_option.warn_implicit_interface = value;
 373       break;
 374
 375     case OPT_Wline_truncation:
 376       gfc_option.warn_line_truncation = value;
 377       break;
 378
 379     case OPT_Wunderflow:
 380       gfc_option.warn_underflow = value;
 381       break;
 382
 383     case OPT_Wsurprising:
 384       gfc_option.warn_surprising = value;
 385       break;
 386
 387     case OPT_Wunused_labels:
 388       gfc_option.warn_unused_labels = value;
 389       break;
 390
 391     case OPT_fcray_pointer:
 392       gfc_option.flag_cray_pointer = value;
 393       break;
 394
 395     case OPT_ff2c:
 396       gfc_option.flag_f2c = value;
 397       break;
 398
 399     case OPT_fdollar_ok:
 400       gfc_option.flag_dollar_ok = value;
 401       break;
 402
 403     case OPT_fautomatic:
 404       gfc_option.flag_automatic = value;
 405       break;
 406
 407     case OPT_fbackslash:
 408       gfc_option.flag_backslash = value;
 409       break;
 410
 411     case OPT_fd_lines_as_code:
 412       gfc_option.flag_d_lines = 1;
 413       break;
 414
 415     case OPT_fd_lines_as_comments:
 416       gfc_option.flag_d_lines = 0;
 417       break;
 418
 419     case OPT_fdump_parse_tree:
 420       gfc_option.verbose = value;
 421       break;
 422
 423     case OPT_ffixed_form:
 424       gfc_option.source_form = FORM_FIXED;
 425       break;
 426
 427     case OPT_ffixed_line_length_none:
 428       gfc_option.fixed_line_length = 0;
 429       break;
 430
 431     case OPT_ffixed_line_length_:
 432       if (value != 0 && value < 7)
 433         gfc_fatal_error ("Fixed line length must be at least seven.");
 434       gfc_option.fixed_line_length = value;
 435       break;
 436
 437     case OPT_ffree_form:
 438       gfc_option.source_form = FORM_FREE;
 439       break;
 440
 441     case OPT_ffree_line_length_none:
 442       gfc_option.free_line_length = 0;
 443       break;
 444
 445     case OPT_ffree_line_length_:
 446       gfc_option.free_line_length = value;
 447       break;
 448
 449     case OPT_funderscoring:
 450       gfc_option.flag_underscoring = value;
 451       break;
 452
 453     case OPT_fsecond_underscore:
 454       gfc_option.flag_second_underscore = value;
 455       break;
 456
 457     case OPT_fimplicit_none:
 458       gfc_option.flag_implicit_none = value;
 459       break;
 460
 461     case OPT_fmax_stack_var_size_:
 462       gfc_option.flag_max_stack_var_size = value;
 463       break;
 464
 465     case OPT_fmodule_private:
 466       gfc_option.flag_module_access_private = value;
 467       break;
 468
 469     case OPT_fno_backend:
 470       gfc_option.flag_no_backend = value;
 471       break;
 472
 473     case OPT_fpack_derived:
 474       gfc_option.flag_pack_derived = value;
 475       break;
 476
 477     case OPT_frepack_arrays:
 478       gfc_option.flag_repack_arrays = value;
 479       break;
 480
 481     case OPT_fmax_identifier_length_:
 482       if (value > GFC_MAX_SYMBOL_LEN)
 483         gfc_fatal_error ("Maximum supported idenitifier length is %d",
 484                          GFC_MAX_SYMBOL_LEN);
 485       gfc_option.max_identifier_length = value;
 486       break;
 487
 488     case OPT_qkind_:
 489       if (gfc_validate_kind (BT_REAL, value, true) < 0)
 490         gfc_fatal_error ("Argument to -fqkind isn't a valid real kind");
 491       gfc_option.q_kind = value;
 492       break;
 493
 494     case OPT_fdefault_integer_8:
 495       gfc_option.flag_default_integer = value;
 496       break;
 497
 498     case OPT_fdefault_real_8:
 499       gfc_option.flag_default_real = value;
 500       break;
 501
 502     case OPT_fdefault_double_8:
 503       gfc_option.flag_default_double = value;
 504       break;
 505
 506     case OPT_I:
 507       gfc_add_include_path (arg);
 508       break;
 509
 510     case OPT_J:
 511     case OPT_M:
 512       gfc_handle_module_path_options (arg);
 513       break;
 514
 515     case OPT_ffpe_trap_:
 516       gfc_handle_fpe_trap_option (arg);
 517       break;
 518
 519     case OPT_std_f95:
 520       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95 | GFC_STD_F77;
 521       gfc_option.warn_std = GFC_STD_F95_OBS;
 522       gfc_option.max_identifier_length = 31;
 523       break;
 524
 525     case OPT_std_f2003:
 526       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 527         | GFC_STD_F2003 | GFC_STD_F95;
 528       gfc_option.warn_std = GFC_STD_F95_OBS;
 529       gfc_option.max_identifier_length = 63;
 530       break;
 531
 532     case OPT_std_gnu:
 533       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
 534         | GFC_STD_F77 | GFC_STD_F95 | GFC_STD_F2003
 535         | GFC_STD_GNU | GFC_STD_LEGACY;
 536       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
 537         | GFC_STD_LEGACY;
 538       break;
 539
 540     case OPT_std_legacy:
 541       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
 542         | GFC_STD_F77 | GFC_STD_F95 | GFC_STD_F2003
 543         | GFC_STD_GNU | GFC_STD_LEGACY;
 544       gfc_option.warn_std = 0;
 545       break;
 546
 547     case OPT_Wnonstd_intrinsics:
 548       gfc_option.warn_nonstd_intrinsics = 1;
 549       break;
 550
 551     case OPT_fshort_enums:
 552       gfc_option.fshort_enums = 1;
 553       break;
 554     }
 555
 556   return result;
 557 }