gcc/fortran/options.c

   1 /* Parse and display command line options.
   2    Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006
   3    Free Software Foundation, 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_ampersand = 0;
  56   gfc_option.warn_conversion = 0;
  57   gfc_option.warn_implicit_interface = 0;
  58   gfc_option.warn_line_truncation = 0;
  59   gfc_option.warn_surprising = 0;
  60   gfc_option.warn_tabs = 1;
  61   gfc_option.warn_underflow = 1;
  62   gfc_option.warn_unused_labels = 0;
  63
  64   gfc_option.flag_default_double = 0;
  65   gfc_option.flag_default_integer = 0;
  66   gfc_option.flag_default_real = 0;
  67   gfc_option.flag_dollar_ok = 0;
  68   gfc_option.flag_underscoring = 1;
  69   gfc_option.flag_f2c = 0;
  70   gfc_option.flag_second_underscore = -1;
  71   gfc_option.flag_implicit_none = 0;
  72   gfc_option.flag_max_stack_var_size = 32768;
  73   gfc_option.flag_module_access_private = 0;
  74   gfc_option.flag_no_backend = 0;
  75   gfc_option.flag_pack_derived = 0;
  76   gfc_option.flag_repack_arrays = 0;
  77   gfc_option.flag_preprocessed = 0;
  78   gfc_option.flag_automatic = 1;
  79   gfc_option.flag_backslash = 1;
  80   gfc_option.flag_cray_pointer = 0;
  81   gfc_option.flag_d_lines = -1;
  82   gfc_option.flag_openmp = 0;
  83
  84   gfc_option.q_kind = gfc_default_double_kind;
  85
  86   gfc_option.fpe = 0;
  87
  88   /* Argument pointers cannot point to anything
  89      but their argument.  */
  90   flag_argument_noalias = 3;
  91
  92   flag_errno_math = 0;
  93
  94   gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
  95     | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F77 | GFC_STD_GNU
  96     | GFC_STD_LEGACY;
  97   gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
  98     | GFC_STD_LEGACY;
  99
 100   gfc_option.warn_nonstd_intrinsics = 0;
 101
 102   /* -fshort-enums can be default on some targets.  */
 103   gfc_option.fshort_enums = targetm.default_short_enums ();
 104
 105   return CL_Fortran;
 106 }
 107
 108
 109 /* Determine the source form from the filename extension.  We assume
 110    case insensitivity.  */
 111
 112 static gfc_source_form
 113 form_from_filename (const char *filename)
 114 {
 115
 116   static const struct
 117   {
 118     const char *extension;
 119     gfc_source_form form;
 120   }
 121   exttype[] =
 122   {
 123     {
 124     ".f90", FORM_FREE}
 125     ,
 126     {
 127     ".f95", FORM_FREE}
 128     ,
 129     {
 130     ".f", FORM_FIXED}
 131     ,
 132     {
 133     ".for", FORM_FIXED}
 134     ,
 135     {
 136     "", FORM_UNKNOWN}
 137   };            /* sentinel value */
 138
 139   gfc_source_form f_form;
 140   const char *fileext;
 141   int i;
 142
 143   /* Find end of file name.  Note, filename is either a NULL pointer or
 144      a NUL terminated string.  */
 145   i = 0;
 146   while (filename[i] != '\0')
 147     i++;
 148
 149   /* Find last period.  */
 150   while (i >= 0 && (filename[i] != '.'))
 151     i--;
 152
 153   /* Did we see a file extension?  */
 154   if (i < 0)
 155     return FORM_UNKNOWN; /* Nope  */
 156
 157   /* Get file extension and compare it to others.  */
 158   fileext = &(filename[i]);
 159
 160   i = -1;
 161   f_form = FORM_UNKNOWN;
 162   do
 163     {
 164       i++;
 165       if (strcasecmp (fileext, exttype[i].extension) == 0)
 166         {
 167           f_form = exttype[i].form;
 168           break;
 169         }
 170     }
 171   while (exttype[i].form != FORM_UNKNOWN);
 172
 173   return f_form;
 174 }
 175
 176
 177 /* Finalize commandline options.  */
 178
 179 bool
 180 gfc_post_options (const char **pfilename)
 181 {
 182   const char *filename = *pfilename, *canon_source_file = NULL;
 183   char *source_path;
 184   int i;
 185
 186   /* Verify the input file name.  */
 187   if (!filename || strcmp (filename, "-") == 0)
 188     {
 189       filename = "";
 190     }
 191
 192   if (gfc_option.flag_preprocessed)
 193     {
 194       /* For preprocessed files, if the first tokens are of the form # NUM.
 195          handle the directives so we know the original file name.  */
 196       gfc_source_file = gfc_read_orig_filename (filename, &canon_source_file);
 197       if (gfc_source_file == NULL)
 198         gfc_source_file = filename;
 199       else
 200         *pfilename = gfc_source_file;
 201     }
 202   else
 203     gfc_source_file = filename;
 204
 205   if (canon_source_file == NULL)
 206     canon_source_file = gfc_source_file;
 207
 208   /* Adds the path where the source file is to the list of include files.  */
 209
 210   i = strlen (canon_source_file);
 211   while (i > 0 && !IS_DIR_SEPARATOR (canon_source_file[i]))
 212     i--;
 213   if (i != 0)
 214     {
 215       source_path = alloca (i + 1);
 216       memcpy (source_path, canon_source_file, i);
 217       source_path[i] = 0;
 218       gfc_add_include_path (source_path);
 219     }
 220   else
 221     gfc_add_include_path (".");
 222
 223   if (canon_source_file != gfc_source_file)
 224     gfc_free ((void *) canon_source_file);
 225
 226   /* Decide which form the file will be read in as.  */
 227
 228   if (gfc_option.source_form != FORM_UNKNOWN)
 229     gfc_current_form = gfc_option.source_form;
 230   else
 231     {
 232       gfc_current_form = form_from_filename (filename);
 233
 234       if (gfc_current_form == FORM_UNKNOWN)
 235         {
 236           gfc_current_form = FORM_FREE;
 237           gfc_warning_now ("Reading file '%s' as free form.",
 238                            (filename[0] == '\0') ? "<stdin>" : filename);
 239         }
 240     }
 241
 242   /* If the user specified -fd-lines-as-{code|comments} verify that we're
 243      in fixed form.  */
 244   if (gfc_current_form == FORM_FREE)
 245     {
 246       if (gfc_option.flag_d_lines == 0)
 247         gfc_warning_now ("'-fd-lines-as-comments' has no effect "
 248                          "in free form.");
 249       else if (gfc_option.flag_d_lines == 1)
 250         gfc_warning_now ("'-fd-lines-as-code' has no effect "
 251                          "in free form.");
 252     }
 253
 254   flag_inline_trees = 1;
 255
 256   /* Use tree inlining.  */
 257   if (!flag_no_inline)
 258     flag_no_inline = 1;
 259   if (flag_inline_functions)
 260     flag_inline_trees = 2;
 261
 262   /* If -pedantic, warn about the use of GNU extensions.  */
 263   if (pedantic && (gfc_option.allow_std & GFC_STD_GNU) != 0)
 264     gfc_option.warn_std |= GFC_STD_GNU;
 265   /* -std=legacy -pedantic is effectively -std=gnu.  */
 266   if (pedantic && (gfc_option.allow_std & GFC_STD_LEGACY) != 0)
 267     gfc_option.warn_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL | GFC_STD_LEGACY;
 268
 269   /* If the user didn't explicitly specify -f(no)-second-underscore we
 270      use it if we're trying to be compatible with f2c, and not
 271      otherwise.  */
 272   if (gfc_option.flag_second_underscore == -1)
 273     gfc_option.flag_second_underscore = gfc_option.flag_f2c;
 274
 275   /* Implement -fno-automatic as -fmax-stack-var-size=0.  */
 276   if (!gfc_option.flag_automatic)
 277     gfc_option.flag_max_stack_var_size = 0;
 278
 279   if (pedantic)
 280     gfc_option.warn_ampersand = 1;
 281
 282   return false;
 283 }
 284
 285
 286 /* Set the options for -Wall.  */
 287
 288 static void
 289 set_Wall (void)
 290 {
 291
 292   gfc_option.warn_aliasing = 1;
 293   gfc_option.warn_ampersand = 1;
 294   gfc_option.warn_line_truncation = 1;
 295   gfc_option.warn_nonstd_intrinsics = 1;
 296   gfc_option.warn_surprising = 1;
 297   gfc_option.warn_tabs = 0;
 298   gfc_option.warn_underflow = 1;
 299   gfc_option.warn_unused_labels = 1;
 300
 301   set_Wunused (1);
 302   warn_return_type = 1;
 303   warn_switch = 1;
 304
 305   /* We save the value of warn_uninitialized, since if they put
 306      -Wuninitialized on the command line, we need to generate a
 307      warning about not using it without also specifying -O.  */
 308
 309   if (warn_uninitialized != 1)
 310     warn_uninitialized = 2;
 311 }
 312
 313
 314 static void
 315 gfc_handle_module_path_options (const char *arg)
 316 {
 317
 318   if (gfc_option.module_dir != NULL)
 319     {
 320       gfc_status ("gfortran: Only one -M option allowed\n");
 321       exit (3);
 322     }
 323
 324   if (arg == NULL)
 325     {
 326       gfc_status ("gfortran: Directory required after -M\n");
 327       exit (3);
 328     }
 329
 330   gfc_option.module_dir = (char *) gfc_getmem (strlen (arg) + 2);
 331   strcpy (gfc_option.module_dir, arg);
 332   strcat (gfc_option.module_dir, "/");
 333 }
 334
 335 static void
 336 gfc_handle_fpe_trap_option (const char *arg)
 337 {
 338   int result, pos = 0, n;
 339   static const char * const exception[] = { "invalid", "denormal", "zero",
 340                                             "overflow", "underflow",
 341                                             "precision", NULL };
 342   static const int opt_exception[] = { GFC_FPE_INVALID, GFC_FPE_DENORMAL,
 343                                        GFC_FPE_ZERO, GFC_FPE_OVERFLOW,
 344                                        GFC_FPE_UNDERFLOW, GFC_FPE_PRECISION,
 345                                        0 };
 346
 347   while (*arg)
 348     {
 349       while (*arg == ',')
 350         arg++;
 351       while (arg[pos] && arg[pos] != ',')
 352         pos++;
 353       result = 0;
 354       for (n = 0; exception[n] != NULL; n++)
 355         {
 356           if (exception[n] && strncmp (exception[n], arg, pos) == 0)
 357             {
 358               gfc_option.fpe |= opt_exception[n];
 359               arg += pos;
 360               pos = 0;
 361               result = 1;
 362               break;
 363             }
 364         }
 365       if (! result)
 366         gfc_fatal_error ("Argument to -ffpe-trap is not valid: %s", arg);
 367     }
 368 }
 369
 370 /* Handle command-line options.  Returns 0 if unrecognized, 1 if
 371    recognized and handled.  */
 372 int
 373 gfc_handle_option (size_t scode, const char *arg, int value)
 374 {
 375   int result = 1;
 376   enum opt_code code = (enum opt_code) scode;
 377
 378   /* Ignore file names.  */
 379   if (code == N_OPTS)
 380     return 1;
 381
 382   switch (code)
 383     {
 384     default:
 385       result = 0;
 386       break;
 387
 388     case OPT_Wall:
 389       set_Wall ();
 390       break;
 391
 392     case OPT_Waliasing:
 393       gfc_option.warn_aliasing = value;
 394       break;
 395
 396     case OPT_Wampersand:
 397       gfc_option.warn_ampersand = value;
 398       break;
 399
 400     case OPT_Wconversion:
 401       gfc_option.warn_conversion = value;
 402       break;
 403
 404     case OPT_Wimplicit_interface:
 405       gfc_option.warn_implicit_interface = value;
 406       break;
 407
 408     case OPT_Wline_truncation:
 409       gfc_option.warn_line_truncation = value;
 410       break;
 411
 412     case OPT_Wsurprising:
 413       gfc_option.warn_surprising = value;
 414       break;
 415
 416     case OPT_Wtabs:
 417       gfc_option.warn_tabs = value;
 418       break;
 419
 420     case OPT_Wunderflow:
 421       gfc_option.warn_underflow = value;
 422       break;
 423
 424     case OPT_Wunused_labels:
 425       gfc_option.warn_unused_labels = value;
 426       break;
 427
 428     case OPT_fcray_pointer:
 429       gfc_option.flag_cray_pointer = value;
 430       break;
 431
 432     case OPT_ff2c:
 433       gfc_option.flag_f2c = value;
 434       break;
 435
 436     case OPT_fdollar_ok:
 437       gfc_option.flag_dollar_ok = value;
 438       break;
 439
 440     case OPT_fautomatic:
 441       gfc_option.flag_automatic = value;
 442       break;
 443
 444     case OPT_fbackslash:
 445       gfc_option.flag_backslash = value;
 446       break;
 447
 448     case OPT_fd_lines_as_code:
 449       gfc_option.flag_d_lines = 1;
 450       break;
 451
 452     case OPT_fd_lines_as_comments:
 453       gfc_option.flag_d_lines = 0;
 454       break;
 455
 456     case OPT_fdump_parse_tree:
 457       gfc_option.verbose = value;
 458       break;
 459
 460     case OPT_ffixed_form:
 461       gfc_option.source_form = FORM_FIXED;
 462       break;
 463
 464     case OPT_ffixed_line_length_none:
 465       gfc_option.fixed_line_length = 0;
 466       break;
 467
 468     case OPT_ffixed_line_length_:
 469       if (value != 0 && value < 7)
 470         gfc_fatal_error ("Fixed line length must be at least seven.");
 471       gfc_option.fixed_line_length = value;
 472       break;
 473
 474     case OPT_ffree_form:
 475       gfc_option.source_form = FORM_FREE;
 476       break;
 477
 478     case OPT_fopenmp:
 479       gfc_option.flag_openmp = value;
 480       break;
 481
 482     case OPT_ffree_line_length_none:
 483       gfc_option.free_line_length = 0;
 484       break;
 485
 486     case OPT_ffree_line_length_:
 487       gfc_option.free_line_length = value;
 488       break;
 489
 490     case OPT_funderscoring:
 491       gfc_option.flag_underscoring = value;
 492       break;
 493
 494     case OPT_fsecond_underscore:
 495       gfc_option.flag_second_underscore = value;
 496       break;
 497
 498     case OPT_fimplicit_none:
 499       gfc_option.flag_implicit_none = value;
 500       break;
 501
 502     case OPT_fmax_stack_var_size_:
 503       gfc_option.flag_max_stack_var_size = value;
 504       break;
 505
 506     case OPT_fmodule_private:
 507       gfc_option.flag_module_access_private = value;
 508       break;
 509
 510     case OPT_fno_backend:
 511       gfc_option.flag_no_backend = value;
 512       break;
 513
 514     case OPT_fpack_derived:
 515       gfc_option.flag_pack_derived = value;
 516       break;
 517
 518     case OPT_frepack_arrays:
 519       gfc_option.flag_repack_arrays = value;
 520       break;
 521
 522     case OPT_fpreprocessed:
 523       gfc_option.flag_preprocessed = value;
 524       break;
 525
 526     case OPT_fmax_identifier_length_:
 527       if (value > GFC_MAX_SYMBOL_LEN)
 528         gfc_fatal_error ("Maximum supported idenitifier length is %d",
 529                          GFC_MAX_SYMBOL_LEN);
 530       gfc_option.max_identifier_length = value;
 531       break;
 532
 533     case OPT_qkind_:
 534       if (gfc_validate_kind (BT_REAL, value, true) < 0)
 535         gfc_fatal_error ("Argument to -fqkind isn't a valid real kind");
 536       gfc_option.q_kind = value;
 537       break;
 538
 539     case OPT_fdefault_integer_8:
 540       gfc_option.flag_default_integer = value;
 541       break;
 542
 543     case OPT_fdefault_real_8:
 544       gfc_option.flag_default_real = value;
 545       break;
 546
 547     case OPT_fdefault_double_8:
 548       gfc_option.flag_default_double = value;
 549       break;
 550
 551     case OPT_I:
 552       gfc_add_include_path (arg);
 553       break;
 554
 555     case OPT_J:
 556     case OPT_M:
 557       gfc_handle_module_path_options (arg);
 558       break;
 559
 560     case OPT_ffpe_trap_:
 561       gfc_handle_fpe_trap_option (arg);
 562       break;
 563
 564     case OPT_std_f95:
 565       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95 | GFC_STD_F77;
 566       gfc_option.warn_std = GFC_STD_F95_OBS;
 567       gfc_option.max_identifier_length = 31;
 568       gfc_option.warn_ampersand = 1;
 569       gfc_option.warn_tabs = 0;
 570       break;
 571
 572     case OPT_std_f2003:
 573       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 574         | GFC_STD_F2003 | GFC_STD_F95;
 575       gfc_option.warn_std = GFC_STD_F95_OBS;
 576       gfc_option.max_identifier_length = 63;
 577       gfc_option.warn_ampersand = 1;
 578       break;
 579
 580     case OPT_std_gnu:
 581       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
 582         | GFC_STD_F77 | GFC_STD_F95 | GFC_STD_F2003
 583         | GFC_STD_GNU | GFC_STD_LEGACY;
 584       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
 585         | GFC_STD_LEGACY;
 586       break;
 587
 588     case OPT_std_legacy:
 589       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
 590         | GFC_STD_F77 | GFC_STD_F95 | GFC_STD_F2003
 591         | GFC_STD_GNU | GFC_STD_LEGACY;
 592       gfc_option.warn_std = 0;
 593       break;
 594
 595     case OPT_Wnonstd_intrinsics:
 596       gfc_option.warn_nonstd_intrinsics = 1;
 597       break;
 598
 599     case OPT_fshort_enums:
 600       gfc_option.fshort_enums = 1;
 601       break;
 602
 603     case OPT_fconvert_little_endian:
 604       gfc_option.convert = CONVERT_LITTLE;
 605       break;
 606
 607     case OPT_fconvert_big_endian:
 608       gfc_option.convert = CONVERT_BIG;
 609       break;
 610
 611     case OPT_fconvert_native:
 612       gfc_option.convert = CONVERT_NATIVE;
 613       break;
 614
 615     case OPT_fconvert_swap:
 616       gfc_option.convert = CONVERT_SWAP;
 617       break;
 618
 619     case OPT_frecord_marker_4:
 620       gfc_option.record_marker = 4;
 621       break;
 622
 623     case OPT_frecord_marker_8:
 624       gfc_option.record_marker = 8;
 625       break;
 626     }
 627
 628   return result;
 629 }