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