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 "vec.h"
  29 #include "input.h"
  30 #include "alias.h"
  31 #include "symtab.h"
  32 #include "inchash.h"
  33 #include "tree.h" /* Required by langhooks.h.  */
  34 #include "fold-const.h"
  35 #include "predict.h"
  36 #include "tm.h"
  37 #include "hard-reg-set.h"
  38 #include "input.h"
  39 #include "function.h"
  40 #include "basic-block.h"
  41 #include "tree-ssa-alias.h"
  42 #include "internal-fn.h"
  43 #include "gimple-expr.h"
  44 #include "is-a.h"
  45 #include "gimple.h"
  46 #include "langhooks.h"
  47 #include "rtl.h"
  48 #include "dbgcnt.h"
  49 #include "debug.h"
  50 #include "hash-map.h"
  51 #include "plugin-api.h"
  52 #include "ipa-ref.h"
  53 #include "cgraph.h"
  54 #include "lto-streamer.h"
  55 #include "output.h"
  56 #include "plugin.h"
  57 #include "toplev.h"
  58 #include "tree-pass.h"
  59 #include "context.h"
  60 #include "asan.h"
  61
  62 typedef const char *const_char_p; /* For DEF_VEC_P.  */
  63
  64 static vec<const_char_p> ignored_options;
  65
  66 /* Input file names.  */
  67 const char **in_fnames;
  68 unsigned num_in_fnames;
  69
  70 /* Return a malloced slash-separated list of languages in MASK.  */
  71
  72 static char *
  73 write_langs (unsigned int mask)
  74 {
  75   unsigned int n = 0, len = 0;
  76   const char *lang_name;
  77   char *result;
  78
  79   for (n = 0; (lang_name = lang_names[n]) != 0; n++)
  80     if (mask & (1U << n))
  81       len += strlen (lang_name) + 1;
  82
  83   result = XNEWVEC (char, len);
  84   len = 0;
  85   for (n = 0; (lang_name = lang_names[n]) != 0; n++)
  86     if (mask & (1U << n))
  87       {
  88         if (len)
  89           result[len++] = '/';
  90         strcpy (result + len, lang_name);
  91         len += strlen (lang_name);
  92       }
  93
  94   result[len] = 0;
  95
  96   return result;
  97 }
  98
  99 /* Complain that switch DECODED does not apply to this front end (mask
 100    LANG_MASK).  */
 101
 102 static void
 103 complain_wrong_lang (const struct cl_decoded_option *decoded,
 104                      unsigned int lang_mask)
 105 {
 106   const struct cl_option *option = &cl_options[decoded->opt_index];
 107   const char *text = decoded->orig_option_with_args_text;
 108   char *ok_langs = NULL, *bad_lang = NULL;
 109   unsigned int opt_flags = option->flags;
 110
 111   if (!lang_hooks.complain_wrong_lang_p (option))
 112     return;
 113
 114   opt_flags &= ((1U << cl_lang_count) - 1) | CL_DRIVER;
 115   if (opt_flags != CL_DRIVER)
 116     ok_langs = write_langs (opt_flags);
 117   if (lang_mask != CL_DRIVER)
 118     bad_lang = write_langs (lang_mask);
 119
 120   if (opt_flags == CL_DRIVER)
 121     error ("command line option %qs is valid for the driver but not for %s",
 122            text, bad_lang);
 123   else if (lang_mask == CL_DRIVER)
 124     gcc_unreachable ();
 125   else
 126     /* Eventually this should become a hard error IMO.  */
 127     warning (0, "command line option %qs is valid for %s but not for %s",
 128              text, ok_langs, bad_lang);
 129
 130   free (ok_langs);
 131   free (bad_lang);
 132 }
 133
 134 /* Buffer the unknown option described by the string OPT.  Currently,
 135    we only complain about unknown -Wno-* options if they may have
 136    prevented a diagnostic. Otherwise, we just ignore them.  Note that
 137    if we do complain, it is only as a warning, not an error; passing
 138    the compiler an unrecognized -Wno-* option should never change
 139    whether the compilation succeeds or fails.  */
 140
 141 static void
 142 postpone_unknown_option_warning (const char *opt)
 143 {
 144   ignored_options.safe_push (opt);
 145 }
 146
 147 /* Produce a warning for each option previously buffered.  */
 148
 149 void
 150 print_ignored_options (void)
 151 {
 152   while (!ignored_options.is_empty ())
 153     {
 154       const char *opt;
 155
 156       opt = ignored_options.pop ();
 157       warning_at (UNKNOWN_LOCATION, 0,
 158                   "unrecognized command line option %qs", opt);
 159     }
 160 }
 161
 162 /* Handle an unknown option DECODED, returning true if an error should
 163    be given.  */
 164
 165 static bool
 166 unknown_option_callback (const struct cl_decoded_option *decoded)
 167 {
 168   const char *opt = decoded->arg;
 169
 170   if (opt[1] == 'W' && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-'
 171       && !(decoded->errors & CL_ERR_NEGATIVE))
 172     {
 173       /* We don't generate warnings for unknown -Wno-* options unless
 174          we issue diagnostics.  */
 175       postpone_unknown_option_warning (opt);
 176       return false;
 177     }
 178   else
 179     return true;
 180 }
 181
 182 /* Handle a front-end option; arguments and return value as for
 183    handle_option.  */
 184
 185 static bool
 186 lang_handle_option (struct gcc_options *opts,
 187                     struct gcc_options *opts_set,
 188                     const struct cl_decoded_option *decoded,
 189                     unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
 190                     location_t loc,
 191                     const struct cl_option_handlers *handlers,
 192                     diagnostic_context *dc)
 193 {
 194   gcc_assert (opts == &global_options);
 195   gcc_assert (opts_set == &global_options_set);
 196   gcc_assert (dc == global_dc);
 197   gcc_assert (decoded->canonical_option_num_elements <= 2);
 198   return lang_hooks.handle_option (decoded->opt_index, decoded->arg,
 199                                    decoded->value, kind, loc, handlers);
 200 }
 201
 202 /* Handle FILENAME from the command line.  */
 203
 204 static void
 205 add_input_filename (const char *filename)
 206 {
 207   num_in_fnames++;
 208   in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
 209   in_fnames[num_in_fnames - 1] = filename;
 210 }
 211
 212 /* Handle the vector of command line options (located at LOC), storing
 213    the results of processing DECODED_OPTIONS and DECODED_OPTIONS_COUNT
 214    in OPTS and OPTS_SET and using DC for diagnostic state.  LANG_MASK
 215    contains has a single bit set representing the current language.
 216    HANDLERS describes what functions to call for the options.  */
 217
 218 static void
 219 read_cmdline_options (struct gcc_options *opts, struct gcc_options *opts_set,
 220                       struct cl_decoded_option *decoded_options,
 221                       unsigned int decoded_options_count,
 222                       location_t loc,
 223                       unsigned int lang_mask,
 224                       const struct cl_option_handlers *handlers,
 225                       diagnostic_context *dc)
 226 {
 227   unsigned int i;
 228
 229   for (i = 1; i < decoded_options_count; i++)
 230     {
 231       if (decoded_options[i].opt_index == OPT_SPECIAL_input_file)
 232         {
 233           /* Input files should only ever appear on the main command
 234              line.  */
 235           gcc_assert (opts == &global_options);
 236           gcc_assert (opts_set == &global_options_set);
 237
 238           if (opts->x_main_input_filename == NULL)
 239             {
 240               opts->x_main_input_filename = decoded_options[i].arg;
 241               opts->x_main_input_baselength
 242                 = base_of_path (opts->x_main_input_filename,
 243                                 &opts->x_main_input_basename);
 244             }
 245           add_input_filename (decoded_options[i].arg);
 246           continue;
 247         }
 248
 249       read_cmdline_option (opts, opts_set,
 250                            decoded_options + i, loc, lang_mask, handlers,
 251                            dc);
 252     }
 253 }
 254
 255 /* Language mask determined at initialization.  */
 256 static unsigned int initial_lang_mask;
 257
 258 /* Initialize global options-related settings at start-up.  */
 259
 260 void
 261 init_options_once (void)
 262 {
 263   /* Perform language-specific options initialization.  */
 264   initial_lang_mask = lang_hooks.option_lang_mask ();
 265
 266   lang_hooks.initialize_diagnostics (global_dc);
 267   /* ??? Ideally, we should do this earlier and the FEs will override
 268      it if desired (none do it so far).  However, the way the FEs
 269      construct their pretty-printers means that all previous settings
 270      are overriden.  */
 271   diagnostic_color_init (global_dc);
 272 }
 273
 274 /* Decode command-line options to an array, like
 275    decode_cmdline_options_to_array and with the same arguments but
 276    using the default lang_mask.  */
 277
 278 void
 279 decode_cmdline_options_to_array_default_mask (unsigned int argc,
 280                                               const char **argv,
 281                                               struct cl_decoded_option **decoded_options,
 282                                               unsigned int *decoded_options_count)
 283 {
 284   decode_cmdline_options_to_array (argc, argv,
 285                                    initial_lang_mask | CL_COMMON | CL_TARGET,
 286                                    decoded_options, decoded_options_count);
 287 }
 288
 289 /* Set *HANDLERS to the default set of option handlers for use in the
 290    compilers proper (not the driver).  */
 291 void
 292 set_default_handlers (struct cl_option_handlers *handlers)
 293 {
 294   handlers->unknown_option_callback = unknown_option_callback;
 295   handlers->wrong_lang_callback = complain_wrong_lang;
 296   handlers->num_handlers = 3;
 297   handlers->handlers[0].handler = lang_handle_option;
 298   handlers->handlers[0].mask = initial_lang_mask;
 299   handlers->handlers[1].handler = common_handle_option;
 300   handlers->handlers[1].mask = CL_COMMON;
 301   handlers->handlers[2].handler = target_handle_option;
 302   handlers->handlers[2].mask = CL_TARGET;
 303 }
 304
 305 /* Parse command line options and set default flag values.  Do minimal
 306    options processing.  The decoded options are in *DECODED_OPTIONS
 307    and *DECODED_OPTIONS_COUNT; settings go in OPTS, OPTS_SET and DC;
 308    the options are located at LOC.  */
 309 void
 310 decode_options (struct gcc_options *opts, struct gcc_options *opts_set,
 311                 struct cl_decoded_option *decoded_options,
 312                 unsigned int decoded_options_count,
 313                 location_t loc, diagnostic_context *dc)
 314 {
 315   struct cl_option_handlers handlers;
 316
 317   unsigned int lang_mask;
 318
 319   lang_mask = initial_lang_mask;
 320
 321   set_default_handlers (&handlers);
 322
 323   default_options_optimization (opts, opts_set,
 324                                 decoded_options, decoded_options_count,
 325                                 loc, lang_mask, &handlers, dc);
 326
 327   read_cmdline_options (opts, opts_set,
 328                         decoded_options, decoded_options_count,
 329                         loc, lang_mask,
 330                         &handlers, dc);
 331
 332   finish_options (opts, opts_set, loc);
 333 }
 334
 335 /* Process common options that have been deferred until after the
 336    handlers have been called for all options.  */
 337
 338 void
 339 handle_common_deferred_options (void)
 340 {
 341   unsigned int i;
 342   cl_deferred_option *opt;
 343   vec<cl_deferred_option> v;
 344
 345   if (common_deferred_options)
 346     v = *((vec<cl_deferred_option> *) common_deferred_options);
 347   else
 348     v = vNULL;
 349
 350   if (flag_dump_all_passed)
 351     enable_rtl_dump_file ();
 352
 353   if (flag_opt_info)
 354     opt_info_switch_p (NULL);
 355
 356   FOR_EACH_VEC_ELT (v, i, opt)
 357     {
 358       switch (opt->opt_index)
 359         {
 360         case OPT_fcall_used_:
 361           fix_register (opt->arg, 0, 1);
 362           break;
 363
 364         case OPT_fcall_saved_:
 365           fix_register (opt->arg, 0, 0);
 366           break;
 367
 368         case OPT_fdbg_cnt_:
 369           dbg_cnt_process_opt (opt->arg);
 370           break;
 371
 372         case OPT_fdbg_cnt_list:
 373           dbg_cnt_list_all_counters ();
 374           break;
 375
 376         case OPT_fdebug_prefix_map_:
 377           add_debug_prefix_map (opt->arg);
 378           break;
 379
 380         case OPT_fdump_:
 381           if (!g->get_dumps ()->dump_switch_p (opt->arg))
 382             error ("unrecognized command line option %<-fdump-%s%>", opt->arg);
 383           break;
 384
 385         case OPT_fopt_info_:
 386           if (!opt_info_switch_p (opt->arg))
 387             error ("unrecognized command line option %<-fopt-info-%s%>",
 388                    opt->arg);
 389           break;
 390
 391         case OPT_fenable_:
 392         case OPT_fdisable_:
 393           if (opt->opt_index == OPT_fenable_)
 394             enable_pass (opt->arg);
 395           else
 396             disable_pass (opt->arg);
 397           break;
 398
 399         case OPT_ffixed_:
 400           /* Deferred.  */
 401           fix_register (opt->arg, 1, 1);
 402           break;
 403
 404         case OPT_fplugin_:
 405 #ifdef ENABLE_PLUGIN
 406           add_new_plugin (opt->arg);
 407 #else
 408           error ("plugin support is disabled; configure with --enable-plugin");
 409 #endif
 410           break;
 411
 412         case OPT_fplugin_arg_:
 413 #ifdef ENABLE_PLUGIN
 414           parse_plugin_arg_opt (opt->arg);
 415 #else
 416           error ("plugin support is disabled; configure with --enable-plugin");
 417 #endif
 418           break;
 419
 420         case OPT_frandom_seed:
 421           /* The real switch is -fno-random-seed.  */
 422           if (!opt->value)
 423             set_random_seed (NULL);
 424           break;
 425
 426         case OPT_frandom_seed_:
 427           set_random_seed (opt->arg);
 428           break;
 429
 430         case OPT_fstack_limit:
 431           /* The real switch is -fno-stack-limit.  */
 432           if (!opt->value)
 433             stack_limit_rtx = NULL_RTX;
 434           break;
 435
 436         case OPT_fstack_limit_register_:
 437           {
 438             int reg = decode_reg_name (opt->arg);
 439             if (reg < 0)
 440               error ("unrecognized register name %qs", opt->arg);
 441             else
 442               stack_limit_rtx = gen_rtx_REG (Pmode, reg);
 443           }
 444           break;
 445
 446         case OPT_fstack_limit_symbol_:
 447           stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (opt->arg));
 448           break;
 449
 450         case OPT_fasan_shadow_offset_:
 451           if (!(flag_sanitize & SANITIZE_KERNEL_ADDRESS))
 452             error ("-fasan-shadow-offset should only be used "
 453                    "with -fsanitize=kernel-address");
 454           if (!set_asan_shadow_offset (opt->arg))
 455              error ("unrecognized shadow offset %qs", opt->arg);
 456           break;
 457
 458         case OPT_fsanitize_sections_:
 459           set_sanitized_sections (opt->arg);
 460           break;
 461
 462         default:
 463           gcc_unreachable ();
 464         }
 465     }
 466 }