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) 2002-2015 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 "hash-set.h"
  28 #include "machmode.h"
  29 #include "vec.h"
  30 #include "double-int.h"
  31 #include "input.h"
  32 #include "alias.h"
  33 #include "symtab.h"
  34 #include "wide-int.h"
  35 #include "inchash.h"
  36 #include "tree.h" /* Required by langhooks.h.  */
  37 #include "fold-const.h"
  38 #include "predict.h"
  39 #include "tm.h"
  40 #include "hard-reg-set.h"
  41 #include "input.h"
  42 #include "function.h"
  43 #include "basic-block.h"
  44 #include "tree-ssa-alias.h"
  45 #include "internal-fn.h"
  46 #include "gimple-expr.h"
  47 #include "is-a.h"
  48 #include "gimple.h"
  49 #include "langhooks.h"
  50 #include "rtl.h"
  51 #include "dbgcnt.h"
  52 #include "debug.h"
  53 #include "hash-map.h"
  54 #include "plugin-api.h"
  55 #include "ipa-ref.h"
  56 #include "cgraph.h"
  57 #include "lto-streamer.h"
  58 #include "output.h"
  59 #include "plugin.h"
  60 #include "toplev.h"
  61 #include "tree-pass.h"
  62 #include "context.h"
  63 #include "asan.h"
  64
  65 typedef const char *const_char_p; /* For DEF_VEC_P.  */
  66
  67 static vec<const_char_p> ignored_options;
  68
  69 /* Input file names.  */
  70 const char **in_fnames;
  71 unsigned num_in_fnames;
  72
  73 /* Return a malloced slash-separated list of languages in MASK.  */
  74
  75 static char *
  76 write_langs (unsigned int mask)
  77 {
  78   unsigned int n = 0, len = 0;
  79   const char *lang_name;
  80   char *result;
  81
  82   for (n = 0; (lang_name = lang_names[n]) != 0; n++)
  83     if (mask & (1U << n))
  84       len += strlen (lang_name) + 1;
  85
  86   result = XNEWVEC (char, len);
  87   len = 0;
  88   for (n = 0; (lang_name = lang_names[n]) != 0; n++)
  89     if (mask & (1U << n))
  90       {
  91         if (len)
  92           result[len++] = '/';
  93         strcpy (result + len, lang_name);
  94         len += strlen (lang_name);
  95       }
  96
  97   result[len] = 0;
  98
  99   return result;
 100 }
 101
 102 /* Complain that switch DECODED does not apply to this front end (mask
 103    LANG_MASK).  */
 104
 105 static void
 106 complain_wrong_lang (const struct cl_decoded_option *decoded,
 107                      unsigned int lang_mask)
 108 {
 109   const struct cl_option *option = &cl_options[decoded->opt_index];
 110   const char *text = decoded->orig_option_with_args_text;
 111   char *ok_langs = NULL, *bad_lang = NULL;
 112   unsigned int opt_flags = option->flags;
 113
 114   if (!lang_hooks.complain_wrong_lang_p (option))
 115     return;
 116
 117   opt_flags &= ((1U << cl_lang_count) - 1) | CL_DRIVER;
 118   if (opt_flags != CL_DRIVER)
 119     ok_langs = write_langs (opt_flags);
 120   if (lang_mask != CL_DRIVER)
 121     bad_lang = write_langs (lang_mask);
 122
 123   if (opt_flags == CL_DRIVER)
 124     error ("command line option %qs is valid for the driver but not for %s",
 125            text, bad_lang);
 126   else if (lang_mask == CL_DRIVER)
 127     gcc_unreachable ();
 128   else
 129     /* Eventually this should become a hard error IMO.  */
 130     warning (0, "command line option %qs is valid for %s but not for %s",
 131              text, ok_langs, bad_lang);
 132
 133   free (ok_langs);
 134   free (bad_lang);
 135 }
 136
 137 /* Buffer the unknown option described by the string OPT.  Currently,
 138    we only complain about unknown -Wno-* options if they may have
 139    prevented a diagnostic. Otherwise, we just ignore them.  Note that
 140    if we do complain, it is only as a warning, not an error; passing
 141    the compiler an unrecognized -Wno-* option should never change
 142    whether the compilation succeeds or fails.  */
 143
 144 static void
 145 postpone_unknown_option_warning (const char *opt)
 146 {
 147   ignored_options.safe_push (opt);
 148 }
 149
 150 /* Produce a warning for each option previously buffered.  */
 151
 152 void
 153 print_ignored_options (void)
 154 {
 155   while (!ignored_options.is_empty ())
 156     {
 157       const char *opt;
 158
 159       opt = ignored_options.pop ();
 160       warning_at (UNKNOWN_LOCATION, 0,
 161                   "unrecognized command line option %qs", opt);
 162     }
 163 }
 164
 165 /* Handle an unknown option DECODED, returning true if an error should
 166    be given.  */
 167
 168 static bool
 169 unknown_option_callback (const struct cl_decoded_option *decoded)
 170 {
 171   const char *opt = decoded->arg;
 172
 173   if (opt[1] == 'W' && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-'
 174       && !(decoded->errors & CL_ERR_NEGATIVE))
 175     {
 176       /* We don't generate warnings for unknown -Wno-* options unless
 177          we issue diagnostics.  */
 178       postpone_unknown_option_warning (opt);
 179       return false;
 180     }
 181   else
 182     return true;
 183 }
 184
 185 /* Handle a front-end option; arguments and return value as for
 186    handle_option.  */
 187
 188 static bool
 189 lang_handle_option (struct gcc_options *opts,
 190                     struct gcc_options *opts_set,
 191                     const struct cl_decoded_option *decoded,
 192                     unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
 193                     location_t loc,
 194                     const struct cl_option_handlers *handlers,
 195                     diagnostic_context *dc)
 196 {
 197   gcc_assert (opts == &global_options);
 198   gcc_assert (opts_set == &global_options_set);
 199   gcc_assert (dc == global_dc);
 200   gcc_assert (decoded->canonical_option_num_elements <= 2);
 201   return lang_hooks.handle_option (decoded->opt_index, decoded->arg,
 202                                    decoded->value, kind, loc, handlers);
 203 }
 204
 205 /* Handle FILENAME from the command line.  */
 206
 207 static void
 208 add_input_filename (const char *filename)
 209 {
 210   num_in_fnames++;
 211   in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
 212   in_fnames[num_in_fnames - 1] = filename;
 213 }
 214
 215 /* Handle the vector of command line options (located at LOC), storing
 216    the results of processing DECODED_OPTIONS and DECODED_OPTIONS_COUNT
 217    in OPTS and OPTS_SET and using DC for diagnostic state.  LANG_MASK
 218    contains has a single bit set representing the current language.
 219    HANDLERS describes what functions to call for the options.  */
 220
 221 static void
 222 read_cmdline_options (struct gcc_options *opts, struct gcc_options *opts_set,
 223                       struct cl_decoded_option *decoded_options,
 224                       unsigned int decoded_options_count,
 225                       location_t loc,
 226                       unsigned int lang_mask,
 227                       const struct cl_option_handlers *handlers,
 228                       diagnostic_context *dc)
 229 {
 230   unsigned int i;
 231
 232   for (i = 1; i < decoded_options_count; i++)
 233     {
 234       if (decoded_options[i].opt_index == OPT_SPECIAL_input_file)
 235         {
 236           /* Input files should only ever appear on the main command
 237              line.  */
 238           gcc_assert (opts == &global_options);
 239           gcc_assert (opts_set == &global_options_set);
 240
 241           if (opts->x_main_input_filename == NULL)
 242             {
 243               opts->x_main_input_filename = decoded_options[i].arg;
 244               opts->x_main_input_baselength
 245                 = base_of_path (opts->x_main_input_filename,
 246                                 &opts->x_main_input_basename);
 247             }
 248           add_input_filename (decoded_options[i].arg);
 249           continue;
 250         }
 251
 252       read_cmdline_option (opts, opts_set,
 253                            decoded_options + i, loc, lang_mask, handlers,
 254                            dc);
 255     }
 256 }
 257
 258 /* Language mask determined at initialization.  */
 259 static unsigned int initial_lang_mask;
 260
 261 /* Initialize global options-related settings at start-up.  */
 262
 263 void
 264 init_options_once (void)
 265 {
 266   /* Perform language-specific options initialization.  */
 267   initial_lang_mask = lang_hooks.option_lang_mask ();
 268
 269   lang_hooks.initialize_diagnostics (global_dc);
 270   /* ??? Ideally, we should do this earlier and the FEs will override
 271      it if desired (none do it so far).  However, the way the FEs
 272      construct their pretty-printers means that all previous settings
 273      are overriden.  */
 274   diagnostic_color_init (global_dc);
 275 }
 276
 277 /* Decode command-line options to an array, like
 278    decode_cmdline_options_to_array and with the same arguments but
 279    using the default lang_mask.  */
 280
 281 void
 282 decode_cmdline_options_to_array_default_mask (unsigned int argc,
 283                                               const char **argv,
 284                                               struct cl_decoded_option **decoded_options,
 285                                               unsigned int *decoded_options_count)
 286 {
 287   decode_cmdline_options_to_array (argc, argv,
 288                                    initial_lang_mask | CL_COMMON | CL_TARGET,
 289                                    decoded_options, decoded_options_count);
 290 }
 291
 292 /* Set *HANDLERS to the default set of option handlers for use in the
 293    compilers proper (not the driver).  */
 294 void
 295 set_default_handlers (struct cl_option_handlers *handlers)
 296 {
 297   handlers->unknown_option_callback = unknown_option_callback;
 298   handlers->wrong_lang_callback = complain_wrong_lang;
 299   handlers->num_handlers = 3;
 300   handlers->handlers[0].handler = lang_handle_option;
 301   handlers->handlers[0].mask = initial_lang_mask;
 302   handlers->handlers[1].handler = common_handle_option;
 303   handlers->handlers[1].mask = CL_COMMON;
 304   handlers->handlers[2].handler = target_handle_option;
 305   handlers->handlers[2].mask = CL_TARGET;
 306 }
 307
 308 /* Parse command line options and set default flag values.  Do minimal
 309    options processing.  The decoded options are in *DECODED_OPTIONS
 310    and *DECODED_OPTIONS_COUNT; settings go in OPTS, OPTS_SET and DC;
 311    the options are located at LOC.  */
 312 void
 313 decode_options (struct gcc_options *opts, struct gcc_options *opts_set,
 314                 struct cl_decoded_option *decoded_options,
 315                 unsigned int decoded_options_count,
 316                 location_t loc, diagnostic_context *dc)
 317 {
 318   struct cl_option_handlers handlers;
 319
 320   unsigned int lang_mask;
 321
 322   lang_mask = initial_lang_mask;
 323
 324   set_default_handlers (&handlers);
 325
 326   default_options_optimization (opts, opts_set,
 327                                 decoded_options, decoded_options_count,
 328                                 loc, lang_mask, &handlers, dc);
 329
 330   read_cmdline_options (opts, opts_set,
 331                         decoded_options, decoded_options_count,
 332                         loc, lang_mask,
 333                         &handlers, dc);
 334
 335   finish_options (opts, opts_set, loc);
 336 }
 337
 338 /* Process common options that have been deferred until after the
 339    handlers have been called for all options.  */
 340
 341 void
 342 handle_common_deferred_options (void)
 343 {
 344   unsigned int i;
 345   cl_deferred_option *opt;
 346   vec<cl_deferred_option> v;
 347
 348   if (common_deferred_options)
 349     v = *((vec<cl_deferred_option> *) common_deferred_options);
 350   else
 351     v = vNULL;
 352
 353   if (flag_dump_all_passed)
 354     enable_rtl_dump_file ();
 355
 356   if (flag_opt_info)
 357     opt_info_switch_p (NULL);
 358
 359   FOR_EACH_VEC_ELT (v, i, opt)
 360     {
 361       switch (opt->opt_index)
 362         {
 363         case OPT_fcall_used_:
 364           fix_register (opt->arg, 0, 1);
 365           break;
 366
 367         case OPT_fcall_saved_:
 368           fix_register (opt->arg, 0, 0);
 369           break;
 370
 371         case OPT_fdbg_cnt_:
 372           dbg_cnt_process_opt (opt->arg);
 373           break;
 374
 375         case OPT_fdbg_cnt_list:
 376           dbg_cnt_list_all_counters ();
 377           break;
 378
 379         case OPT_fdebug_prefix_map_:
 380           add_debug_prefix_map (opt->arg);
 381           break;
 382
 383         case OPT_fdump_:
 384           if (!g->get_dumps ()->dump_switch_p (opt->arg))
 385             error ("unrecognized command line option %<-fdump-%s%>", opt->arg);
 386           break;
 387
 388         case OPT_fopt_info_:
 389           if (!opt_info_switch_p (opt->arg))
 390             error ("unrecognized command line option %<-fopt-info-%s%>",
 391                    opt->arg);
 392           break;
 393
 394         case OPT_fenable_:
 395         case OPT_fdisable_:
 396           if (opt->opt_index == OPT_fenable_)
 397             enable_pass (opt->arg);
 398           else
 399             disable_pass (opt->arg);
 400           break;
 401
 402         case OPT_ffixed_:
 403           /* Deferred.  */
 404           fix_register (opt->arg, 1, 1);
 405           break;
 406
 407         case OPT_fplugin_:
 408 #ifdef ENABLE_PLUGIN
 409           add_new_plugin (opt->arg);
 410 #else
 411           error ("plugin support is disabled; configure with --enable-plugin");
 412 #endif
 413           break;
 414
 415         case OPT_fplugin_arg_:
 416 #ifdef ENABLE_PLUGIN
 417           parse_plugin_arg_opt (opt->arg);
 418 #else
 419           error ("plugin support is disabled; configure with --enable-plugin");
 420 #endif
 421           break;
 422
 423         case OPT_frandom_seed:
 424           /* The real switch is -fno-random-seed.  */
 425           if (!opt->value)
 426             set_random_seed (NULL);
 427           break;
 428
 429         case OPT_frandom_seed_:
 430           set_random_seed (opt->arg);
 431           break;
 432
 433         case OPT_fstack_limit:
 434           /* The real switch is -fno-stack-limit.  */
 435           if (!opt->value)
 436             stack_limit_rtx = NULL_RTX;
 437           break;
 438
 439         case OPT_fstack_limit_register_:
 440           {
 441             int reg = decode_reg_name (opt->arg);
 442             if (reg < 0)
 443               error ("unrecognized register name %qs", opt->arg);
 444             else
 445               stack_limit_rtx = gen_rtx_REG (Pmode, reg);
 446           }
 447           break;
 448
 449         case OPT_fstack_limit_symbol_:
 450           stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (opt->arg));
 451           break;
 452
 453         case OPT_fasan_shadow_offset_:
 454           if (!(flag_sanitize & SANITIZE_KERNEL_ADDRESS))
 455             error ("-fasan-shadow-offset should only be used "
 456                    "with -fsanitize=kernel-address");
 457           if (!set_asan_shadow_offset (opt->arg))
 458              error ("unrecognized shadow offset %qs", opt->arg);
 459           break;
 460
 461         default:
 462           gcc_unreachable ();
 463         }
 464     }
 465 }