gcc/opts-global.c

   1 /* Command line option handling.  Code involving global state that
   2    should not be shared with the driver.
   3    Copyright (C) 2002-2014 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "diagnostic.h"
  25 #include "opts.h"
  26 #include "flags.h"
  27 #include "tree.h" /* Required by langhooks.h.  */
  28 #include "predict.h"
  29 #include "vec.h"
  30 #include "hashtab.h"
  31 #include "hash-set.h"
  32 #include "machmode.h"
  33 #include "tm.h"
  34 #include "hard-reg-set.h"
  35 #include "input.h"
  36 #include "function.h"
  37 #include "basic-block.h"
  38 #include "tree-ssa-alias.h"
  39 #include "internal-fn.h"
  40 #include "gimple-expr.h"
  41 #include "is-a.h"
  42 #include "gimple.h"
  43 #include "langhooks.h"
  44 #include "rtl.h"
  45 #include "dbgcnt.h"
  46 #include "debug.h"
  47 #include "hash-map.h"
  48 #include "plugin-api.h"
  49 #include "ipa-ref.h"
  50 #include "cgraph.h"
  51 #include "lto-streamer.h"
  52 #include "output.h"
  53 #include "plugin.h"
  54 #include "toplev.h"
  55 #include "tree-pass.h"
  56 #include "context.h"
  57 #include "asan.h"
  58
  59 typedef const char *const_char_p; /* For DEF_VEC_P.  */
  60
  61 static vec<const_char_p> ignored_options;
  62
  63 /* Input file names.  */
  64 const char **in_fnames;
  65 unsigned num_in_fnames;
  66
  67 /* Return a malloced slash-separated list of languages in MASK.  */
  68
  69 static char *
  70 write_langs (unsigned int mask)
  71 {
  72   unsigned int n = 0, len = 0;
  73   const char *lang_name;
  74   char *result;
  75
  76   for (n = 0; (lang_name = lang_names[n]) != 0; n++)
  77     if (mask & (1U << n))
  78       len += strlen (lang_name) + 1;
  79
  80   result = XNEWVEC (char, len);
  81   len = 0;
  82   for (n = 0; (lang_name = lang_names[n]) != 0; n++)
  83     if (mask & (1U << n))
  84       {
  85         if (len)
  86           result[len++] = '/';
  87         strcpy (result + len, lang_name);
  88         len += strlen (lang_name);
  89       }
  90
  91   result[len] = 0;
  92
  93   return result;
  94 }
  95
  96 /* Complain that switch DECODED does not apply to this front end (mask
  97    LANG_MASK).  */
  98
  99 static void
 100 complain_wrong_lang (const struct cl_decoded_option *decoded,
 101                      unsigned int lang_mask)
 102 {
 103   const struct cl_option *option = &cl_options[decoded->opt_index];
 104   const char *text = decoded->orig_option_with_args_text;
 105   char *ok_langs = NULL, *bad_lang = NULL;
 106   unsigned int opt_flags = option->flags;
 107
 108   if (!lang_hooks.complain_wrong_lang_p (option))
 109     return;
 110
 111   opt_flags &= ((1U << cl_lang_count) - 1) | CL_DRIVER;
 112   if (opt_flags != CL_DRIVER)
 113     ok_langs = write_langs (opt_flags);
 114   if (lang_mask != CL_DRIVER)
 115     bad_lang = write_langs (lang_mask);
 116
 117   if (opt_flags == CL_DRIVER)
 118     error ("command line option %qs is valid for the driver but not for %s",
 119            text, bad_lang);
 120   else if (lang_mask == CL_DRIVER)
 121     gcc_unreachable ();
 122   else
 123     /* Eventually this should become a hard error IMO.  */
 124     warning (0, "command line option %qs is valid for %s but not for %s",
 125              text, ok_langs, bad_lang);
 126
 127   free (ok_langs);
 128   free (bad_lang);
 129 }
 130
 131 /* Buffer the unknown option described by the string OPT.  Currently,
 132    we only complain about unknown -Wno-* options if they may have
 133    prevented a diagnostic. Otherwise, we just ignore them.  Note that
 134    if we do complain, it is only as a warning, not an error; passing
 135    the compiler an unrecognized -Wno-* option should never change
 136    whether the compilation succeeds or fails.  */
 137
 138 static void
 139 postpone_unknown_option_warning (const char *opt)
 140 {
 141   ignored_options.safe_push (opt);
 142 }
 143
 144 /* Produce a warning for each option previously buffered.  */
 145
 146 void
 147 print_ignored_options (void)
 148 {
 149   while (!ignored_options.is_empty ())
 150     {
 151       const char *opt;
 152
 153       opt = ignored_options.pop ();
 154       warning_at (UNKNOWN_LOCATION, 0,
 155                   "unrecognized command line option %qs", opt);
 156     }
 157 }
 158
 159 /* Handle an unknown option DECODED, returning true if an error should
 160    be given.  */
 161
 162 static bool
 163 unknown_option_callback (const struct cl_decoded_option *decoded)
 164 {
 165   const char *opt = decoded->arg;
 166
 167   if (opt[1] == 'W' && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-'
 168       && !(decoded->errors & CL_ERR_NEGATIVE))
 169     {
 170       /* We don't generate warnings for unknown -Wno-* options unless
 171          we issue diagnostics.  */
 172       postpone_unknown_option_warning (opt);
 173       return false;
 174     }
 175   else
 176     return true;
 177 }
 178
 179 /* Handle a front-end option; arguments and return value as for
 180    handle_option.  */
 181
 182 static bool
 183 lang_handle_option (struct gcc_options *opts,
 184                     struct gcc_options *opts_set,
 185                     const struct cl_decoded_option *decoded,
 186                     unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
 187                     location_t loc,
 188                     const struct cl_option_handlers *handlers,
 189                     diagnostic_context *dc)
 190 {
 191   gcc_assert (opts == &global_options);
 192   gcc_assert (opts_set == &global_options_set);
 193   gcc_assert (dc == global_dc);
 194   gcc_assert (decoded->canonical_option_num_elements <= 2);
 195   return lang_hooks.handle_option (decoded->opt_index, decoded->arg,
 196                                    decoded->value, kind, loc, handlers);
 197 }
 198
 199 /* Handle FILENAME from the command line.  */
 200
 201 static void
 202 add_input_filename (const char *filename)
 203 {
 204   num_in_fnames++;
 205   in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
 206   in_fnames[num_in_fnames - 1] = filename;
 207 }
 208
 209 /* Handle the vector of command line options (located at LOC), storing
 210    the results of processing DECODED_OPTIONS and DECODED_OPTIONS_COUNT
 211    in OPTS and OPTS_SET and using DC for diagnostic state.  LANG_MASK
 212    contains has a single bit set representing the current language.
 213    HANDLERS describes what functions to call for the options.  */
 214
 215 static void
 216 read_cmdline_options (struct gcc_options *opts, struct gcc_options *opts_set,
 217                       struct cl_decoded_option *decoded_options,
 218                       unsigned int decoded_options_count,
 219                       location_t loc,
 220                       unsigned int lang_mask,
 221                       const struct cl_option_handlers *handlers,
 222                       diagnostic_context *dc)
 223 {
 224   unsigned int i;
 225
 226   for (i = 1; i < decoded_options_count; i++)
 227     {
 228       if (decoded_options[i].opt_index == OPT_SPECIAL_input_file)
 229         {
 230           /* Input files should only ever appear on the main command
 231              line.  */
 232           gcc_assert (opts == &global_options);
 233           gcc_assert (opts_set == &global_options_set);
 234
 235           if (opts->x_main_input_filename == NULL)
 236             {
 237               opts->x_main_input_filename = decoded_options[i].arg;
 238               opts->x_main_input_baselength
 239                 = base_of_path (opts->x_main_input_filename,
 240                                 &opts->x_main_input_basename);
 241             }
 242           add_input_filename (decoded_options[i].arg);
 243           continue;
 244         }
 245
 246       read_cmdline_option (opts, opts_set,
 247                            decoded_options + i, loc, lang_mask, handlers,
 248                            dc);
 249     }
 250 }
 251
 252 /* Language mask determined at initialization.  */
 253 static unsigned int initial_lang_mask;
 254
 255 /* Initialize global options-related settings at start-up.  */
 256
 257 void
 258 init_options_once (void)
 259 {
 260   /* Perform language-specific options initialization.  */
 261   initial_lang_mask = lang_hooks.option_lang_mask ();
 262
 263   lang_hooks.initialize_diagnostics (global_dc);
 264   /* ??? Ideally, we should do this earlier and the FEs will override
 265      it if desired (none do it so far).  However, the way the FEs
 266      construct their pretty-printers means that all previous settings
 267      are overriden.  */
 268   diagnostic_color_init (global_dc);
 269 }
 270
 271 /* Decode command-line options to an array, like
 272    decode_cmdline_options_to_array and with the same arguments but
 273    using the default lang_mask.  */
 274
 275 void
 276 decode_cmdline_options_to_array_default_mask (unsigned int argc,
 277                                               const char **argv,
 278                                               struct cl_decoded_option **decoded_options,
 279                                               unsigned int *decoded_options_count)
 280 {
 281   decode_cmdline_options_to_array (argc, argv,
 282                                    initial_lang_mask | CL_COMMON | CL_TARGET,
 283                                    decoded_options, decoded_options_count);
 284 }
 285
 286 /* Set *HANDLERS to the default set of option handlers for use in the
 287    compilers proper (not the driver).  */
 288 void
 289 set_default_handlers (struct cl_option_handlers *handlers)
 290 {
 291   handlers->unknown_option_callback = unknown_option_callback;
 292   handlers->wrong_lang_callback = complain_wrong_lang;
 293   handlers->num_handlers = 3;
 294   handlers->handlers[0].handler = lang_handle_option;
 295   handlers->handlers[0].mask = initial_lang_mask;
 296   handlers->handlers[1].handler = common_handle_option;
 297   handlers->handlers[1].mask = CL_COMMON;
 298   handlers->handlers[2].handler = target_handle_option;
 299   handlers->handlers[2].mask = CL_TARGET;
 300 }
 301
 302 /* Parse command line options and set default flag values.  Do minimal
 303    options processing.  The decoded options are in *DECODED_OPTIONS
 304    and *DECODED_OPTIONS_COUNT; settings go in OPTS, OPTS_SET and DC;
 305    the options are located at LOC.  */
 306 void
 307 decode_options (struct gcc_options *opts, struct gcc_options *opts_set,
 308                 struct cl_decoded_option *decoded_options,
 309                 unsigned int decoded_options_count,
 310                 location_t loc, diagnostic_context *dc)
 311 {
 312   struct cl_option_handlers handlers;
 313
 314   unsigned int lang_mask;
 315
 316   lang_mask = initial_lang_mask;
 317
 318   set_default_handlers (&handlers);
 319
 320   default_options_optimization (opts, opts_set,
 321                                 decoded_options, decoded_options_count,
 322                                 loc, lang_mask, &handlers, dc);
 323
 324   read_cmdline_options (opts, opts_set,
 325                         decoded_options, decoded_options_count,
 326                         loc, lang_mask,
 327                         &handlers, dc);
 328
 329   finish_options (opts, opts_set, loc);
 330 }
 331
 332 /* Process common options that have been deferred until after the
 333    handlers have been called for all options.  */
 334
 335 void
 336 handle_common_deferred_options (void)
 337 {
 338   unsigned int i;
 339   cl_deferred_option *opt;
 340   vec<cl_deferred_option> v;
 341
 342   if (common_deferred_options)
 343     v = *((vec<cl_deferred_option> *) common_deferred_options);
 344   else
 345     v = vNULL;
 346
 347   if (flag_dump_all_passed)
 348     enable_rtl_dump_file ();
 349
 350   if (flag_opt_info)
 351     opt_info_switch_p (NULL);
 352
 353   FOR_EACH_VEC_ELT (v, i, opt)
 354     {
 355       switch (opt->opt_index)
 356         {
 357         case OPT_fcall_used_:
 358           fix_register (opt->arg, 0, 1);
 359           break;
 360
 361         case OPT_fcall_saved_:
 362           fix_register (opt->arg, 0, 0);
 363           break;
 364
 365         case OPT_fdbg_cnt_:
 366           dbg_cnt_process_opt (opt->arg);
 367           break;
 368
 369         case OPT_fdbg_cnt_list:
 370           dbg_cnt_list_all_counters ();
 371           break;
 372
 373         case OPT_fdebug_prefix_map_:
 374           add_debug_prefix_map (opt->arg);
 375           break;
 376
 377         case OPT_fdump_:
 378           if (!g->get_dumps ()->dump_switch_p (opt->arg))
 379             error ("unrecognized command line option %<-fdump-%s%>", opt->arg);
 380           break;
 381
 382         case OPT_fopt_info_:
 383           if (!opt_info_switch_p (opt->arg))
 384             error ("unrecognized command line option %<-fopt-info-%s%>",
 385                    opt->arg);
 386           break;
 387
 388         case OPT_fenable_:
 389         case OPT_fdisable_:
 390           if (opt->opt_index == OPT_fenable_)
 391             enable_pass (opt->arg);
 392           else
 393             disable_pass (opt->arg);
 394           break;
 395
 396         case OPT_ffixed_:
 397           /* Deferred.  */
 398           fix_register (opt->arg, 1, 1);
 399           break;
 400
 401         case OPT_fplugin_:
 402 #ifdef ENABLE_PLUGIN
 403           add_new_plugin (opt->arg);
 404 #else
 405           error ("plugin support is disabled; configure with --enable-plugin");
 406 #endif
 407           break;
 408
 409         case OPT_fplugin_arg_:
 410 #ifdef ENABLE_PLUGIN
 411           parse_plugin_arg_opt (opt->arg);
 412 #else
 413           error ("plugin support is disabled; configure with --enable-plugin");
 414 #endif
 415           break;
 416
 417         case OPT_frandom_seed:
 418           /* The real switch is -fno-random-seed.  */
 419           if (!opt->value)
 420             set_random_seed (NULL);
 421           break;
 422
 423         case OPT_frandom_seed_:
 424           set_random_seed (opt->arg);
 425           break;
 426
 427         case OPT_fstack_limit:
 428           /* The real switch is -fno-stack-limit.  */
 429           if (!opt->value)
 430             stack_limit_rtx = NULL_RTX;
 431           break;
 432
 433         case OPT_fstack_limit_register_:
 434           {
 435             int reg = decode_reg_name (opt->arg);
 436             if (reg < 0)
 437               error ("unrecognized register name %qs", opt->arg);
 438             else
 439               stack_limit_rtx = gen_rtx_REG (Pmode, reg);
 440           }
 441           break;
 442
 443         case OPT_fstack_limit_symbol_:
 444           stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (opt->arg));
 445           break;
 446
 447         case OPT_fasan_shadow_offset_:
 448           if (!(flag_sanitize & SANITIZE_KERNEL_ADDRESS))
 449             error ("-fasan-shadow-offset should only be used "
 450                    "with -fsanitize=kernel-address");
 451           if (!set_asan_shadow_offset (opt->arg))
 452              error ("unrecognized shadow offset %qs", opt->arg);
 453           break;
 454
 455         default:
 456           gcc_unreachable ();
 457         }
 458     }
 459 }