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