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