gcc/opts.h

   1 /* Command line option handling.
   2    Copyright (C) 2002-2021 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_OPTS_H
  21 #define GCC_OPTS_H
  22
  23 #include "obstack.h"
  24
  25 /* Specifies how a switch's VAR_VALUE relates to its FLAG_VAR.  */
  26 enum cl_var_type {
  27   /* The switch is enabled when FLAG_VAR is nonzero.  */
  28   CLVC_BOOLEAN,
  29
  30   /* The switch is enabled when FLAG_VAR == VAR_VALUE.  */
  31   CLVC_EQUAL,
  32
  33   /* The switch is enabled when VAR_VALUE is not set in FLAG_VAR.  */
  34   CLVC_BIT_CLEAR,
  35
  36   /* The switch is enabled when VAR_VALUE is set in FLAG_VAR.  */
  37   CLVC_BIT_SET,
  38
  39   /* The switch is enabled when FLAG_VAR is less than HOST_WIDE_INT_M1U.  */
  40   CLVC_SIZE,
  41
  42   /* The switch takes a string argument and FLAG_VAR points to that
  43      argument.  */
  44   CLVC_STRING,
  45
  46   /* The switch takes an enumerated argument (VAR_ENUM says what
  47      enumeration) and FLAG_VAR points to that argument.  */
  48   CLVC_ENUM,
  49
  50   /* The switch should be stored in the VEC pointed to by FLAG_VAR for
  51      later processing.  */
  52   CLVC_DEFER
  53 };
  54
  55 struct cl_option
  56 {
  57   /* Text of the option, including initial '-'.  */
  58   const char *opt_text;
  59   /* Help text for --help, or NULL.  */
  60   const char *help;
  61   /* Error message for missing argument, or NULL.  */
  62   const char *missing_argument_error;
  63   /* Warning to give when this option is used, or NULL.  */
  64   const char *warn_message;
  65   /* Argument of alias target when positive option given, or NULL.  */
  66   const char *alias_arg;
  67   /* Argument of alias target when negative option given, or NULL.  */
  68   const char *neg_alias_arg;
  69   /* Alias target, or N_OPTS if not an alias.  */
  70   unsigned short alias_target;
  71   /* Previous option that is an initial substring of this one, or
  72      N_OPTS if none.  */
  73   unsigned short back_chain;
  74   /* Option length, not including initial '-'.  */
  75   unsigned char opt_len;
  76   /* Next option in a sequence marked with Negative, or -1 if none.
  77      For a single option with both a negative and a positve form
  78      (such as -Wall and -Wno-all), NEG_IDX is equal to the option's
  79      own index (i.e., cl_options[IDX].neg_idx == IDX holds).  */
  80   int neg_index;
  81   /* CL_* flags for this option.  */
  82   unsigned int flags;
  83   /* Disabled in this configuration.  */
  84   BOOL_BITFIELD cl_disabled : 1;
  85   /* Options marked with CL_SEPARATE take a number of separate
  86      arguments (1 to 4) that is one more than the number in this
  87      bit-field.  */
  88   unsigned int cl_separate_nargs : 2;
  89   /* Option is an alias when used with separate argument.  */
  90   BOOL_BITFIELD cl_separate_alias : 1;
  91   /* Alias to negative form of option.  */
  92   BOOL_BITFIELD cl_negative_alias : 1;
  93   /* Option takes no argument in the driver.  */
  94   BOOL_BITFIELD cl_no_driver_arg : 1;
  95   /* Reject this option in the driver.  */
  96   BOOL_BITFIELD cl_reject_driver : 1;
  97   /* Reject no- form.  */
  98   BOOL_BITFIELD cl_reject_negative : 1;
  99   /* Missing argument OK (joined).  */
 100   BOOL_BITFIELD cl_missing_ok : 1;
 101   /* Argument is an integer >=0.  */
 102   BOOL_BITFIELD cl_uinteger : 1;
 103   /* Argument is a HOST_WIDE_INT.  */
 104   BOOL_BITFIELD cl_host_wide_int : 1;
 105   /* Argument should be converted to lowercase.  */
 106   BOOL_BITFIELD cl_tolower : 1;
 107   /* Argument is an unsigned integer with an optional byte suffix.  */
 108   BOOL_BITFIELD cl_byte_size: 1;
 109   /* Offset of field for this option in struct gcc_options, or
 110      (unsigned short) -1 if none.  */
 111   unsigned short flag_var_offset;
 112   /* Index in cl_enums of enum used for this option's arguments, for
 113      CLVC_ENUM options.  */
 114   unsigned short var_enum;
 115   /* How this option's value is determined and sets a field.  */
 116   enum cl_var_type var_type;
 117   /* Value or bit-mask with which to set a field.  */
 118   HOST_WIDE_INT var_value;
 119   /* Range info minimum, or -1.  */
 120   int range_min;
 121   /* Range info maximum, or -1.  */
 122   int range_max;
 123 };
 124
 125 struct cl_var
 126 {
 127   /* Name of the variable.  */
 128   const char *var_name;
 129   /* Offset of field for this var in struct gcc_options.  */
 130   unsigned short var_offset;
 131 };
 132
 133 /* Records that the state of an option consists of SIZE bytes starting
 134    at DATA.  DATA might point to CH in some cases.  */
 135 struct cl_option_state {
 136   const void *data;
 137   size_t size;
 138   char ch;
 139 };
 140
 141 extern const struct cl_option cl_options[];
 142 extern const unsigned int cl_options_count;
 143 #ifdef ENABLE_PLUGIN
 144 extern const struct cl_var cl_vars[];
 145 #endif
 146 extern const char *const lang_names[];
 147 extern const unsigned int cl_lang_count;
 148
 149 #define CL_PARAMS               (1U << 16) /* Fake entry.  Used to display --param info with --help.  */
 150 #define CL_WARNING              (1U << 17) /* Enables an (optional) warning message.  */
 151 #define CL_OPTIMIZATION         (1U << 18) /* Enables an (optional) optimization.  */
 152 #define CL_DRIVER               (1U << 19) /* Driver option.  */
 153 #define CL_TARGET               (1U << 20) /* Target-specific option.  */
 154 #define CL_COMMON               (1U << 21) /* Language-independent.  */
 155
 156 #define CL_MIN_OPTION_CLASS     CL_PARAMS
 157 #define CL_MAX_OPTION_CLASS     CL_COMMON
 158
 159 /* From here on the bits describe attributes of the options.
 160    Before this point the bits have described the class of the option.
 161    This distinction is important because --help will not list options
 162    which only have these higher bits set.  */
 163
 164 #define CL_JOINED               (1U << 22) /* If takes joined argument.  */
 165 #define CL_SEPARATE             (1U << 23) /* If takes a separate argument.  */
 166 #define CL_UNDOCUMENTED         (1U << 24) /* Do not output with --help.  */
 167 #define CL_NO_DWARF_RECORD      (1U << 25) /* Do not add to producer string.  */
 168 #define CL_PCH_IGNORE           (1U << 26) /* Do compare state for pch.  */
 169
 170 /* Flags for an enumerated option argument.  */
 171 #define CL_ENUM_CANONICAL       (1 << 0) /* Canonical for this value.  */
 172 #define CL_ENUM_DRIVER_ONLY     (1 << 1) /* Only accepted in the driver.  */
 173
 174 /* Structure describing an enumerated option argument.  */
 175
 176 struct cl_enum_arg
 177 {
 178   /* The argument text, or NULL at the end of the array.  */
 179   const char *arg;
 180
 181   /* The corresponding integer value.  */
 182   int value;
 183
 184   /* Flags associated with this argument.  */
 185   unsigned int flags;
 186 };
 187
 188 /* Structure describing an enumerated set of option arguments.  */
 189
 190 struct cl_enum
 191 {
 192   /* Help text, or NULL if the values should not be listed in --help
 193      output.  */
 194   const char *help;
 195
 196   /* Error message for unknown arguments, or NULL to use a generic
 197      error.  */
 198   const char *unknown_error;
 199
 200   /* Array of possible values.  */
 201   const struct cl_enum_arg *values;
 202
 203   /* The size of the type used to store a value.  */
 204   size_t var_size;
 205
 206   /* Function to set a variable of this type.  */
 207   void (*set) (void *var, int value);
 208
 209   /* Function to get the value of a variable of this type.  */
 210   int (*get) (const void *var);
 211 };
 212
 213 extern const struct cl_enum cl_enums[];
 214 extern const unsigned int cl_enums_count;
 215
 216 /* Possible ways in which a command-line option may be erroneous.
 217    These do not include not being known at all; an option index of
 218    OPT_SPECIAL_unknown is used for that.  */
 219
 220 #define CL_ERR_DISABLED         (1 << 0) /* Disabled in this configuration.  */
 221 #define CL_ERR_MISSING_ARG      (1 << 1) /* Argument required but missing.  */
 222 #define CL_ERR_WRONG_LANG       (1 << 2) /* Option for wrong language.  */
 223 #define CL_ERR_UINT_ARG         (1 << 3) /* Bad unsigned integer argument.  */
 224 #define CL_ERR_INT_RANGE_ARG    (1 << 4) /* Bad unsigned integer argument.  */
 225 #define CL_ERR_ENUM_ARG         (1 << 5) /* Bad enumerated argument.  */
 226 #define CL_ERR_NEGATIVE         (1 << 6) /* Negative form of option
 227                                             not permitted (together
 228                                             with OPT_SPECIAL_unknown).  */
 229
 230 /* Structure describing the result of decoding an option.  */
 231
 232 struct cl_decoded_option
 233 {
 234   /* The index of this option, or an OPT_SPECIAL_* value for
 235      non-options and unknown options.  */
 236   size_t opt_index;
 237
 238   /* Any warning to give for use of this option, or NULL if none.  */
 239   const char *warn_message;
 240
 241   /* The string argument, or NULL if none.  For OPT_SPECIAL_* cases,
 242      the option or non-option command-line argument.  */
 243   const char *arg;
 244
 245   /* The original text of option plus arguments, with separate argv
 246      elements concatenated into one string with spaces separating
 247      them.  This is for such uses as diagnostics and
 248      -frecord-gcc-switches.  */
 249   const char *orig_option_with_args_text;
 250
 251   /* The canonical form of the option and its argument, for when it is
 252      necessary to reconstruct argv elements (in particular, for
 253      processing specs and passing options to subprocesses from the
 254      driver).  */
 255   const char *canonical_option[4];
 256
 257   /* The number of elements in the canonical form of the option and
 258      arguments; always at least 1.  */
 259   size_t canonical_option_num_elements;
 260
 261   /* For a boolean option, 1 for the true case and 0 for the "no-"
 262      case.  For an unsigned integer option, the value of the
 263      argument.  1 in all other cases.  */
 264   HOST_WIDE_INT value;
 265
 266   /* Any flags describing errors detected in this option.  */
 267   int errors;
 268 };
 269
 270 /* Structure describing an option deferred for handling after the main
 271    option handlers.  */
 272
 273 struct cl_deferred_option
 274 {
 275   /* Elements from struct cl_decoded_option used for deferred
 276      options.  */
 277   size_t opt_index;
 278   const char *arg;
 279   int value;
 280 };
 281
 282 /* Structure describing a single option-handling callback.  */
 283
 284 struct cl_option_handler_func
 285 {
 286   /* The function called to handle the option.  */
 287   bool (*handler) (struct gcc_options *opts,
 288                    struct gcc_options *opts_set,
 289                    const struct cl_decoded_option *decoded,
 290                    unsigned int lang_mask, int kind, location_t loc,
 291                    const struct cl_option_handlers *handlers,
 292                    diagnostic_context *dc,
 293                    void (*target_option_override_hook) (void));
 294
 295   /* The mask that must have some bit in common with the flags for the
 296      option for this particular handler to be used.  */
 297   unsigned int mask;
 298 };
 299
 300 /* Structure describing the callbacks used in handling options.  */
 301
 302 struct cl_option_handlers
 303 {
 304   /* Callback for an unknown option to determine whether to give an
 305      error for it, and possibly store information to diagnose the
 306      option at a later point.  Return true if an error should be
 307      given, false otherwise.  */
 308   bool (*unknown_option_callback) (const struct cl_decoded_option *decoded);
 309
 310   /* Callback to handle, and possibly diagnose, an option for another
 311      language.  */
 312   void (*wrong_lang_callback) (const struct cl_decoded_option *decoded,
 313                                unsigned int lang_mask);
 314
 315   /* Target option override hook.  */
 316   void (*target_option_override_hook) (void);
 317
 318   /* The number of individual handlers.  */
 319   size_t num_handlers;
 320
 321   /* The handlers themselves.  */
 322   struct cl_option_handler_func handlers[3];
 323 };
 324
 325 /* Hold command-line options associated with stack limitation.  */
 326 extern const char *opt_fstack_limit_symbol_arg;
 327 extern int opt_fstack_limit_register_no;
 328
 329 /* Input file names.  */
 330
 331 extern const char **in_fnames;
 332
 333 /* The count of input filenames.  */
 334
 335 extern unsigned num_in_fnames;
 336
 337 extern char *opts_concat (const char *first, ...);
 338
 339 /* Obstack for option strings.  */
 340
 341 extern struct obstack opts_obstack;
 342
 343 size_t find_opt (const char *input, unsigned int lang_mask);
 344 extern HOST_WIDE_INT integral_argument (const char *arg, int * = NULL, bool = false);
 345 extern bool enum_value_to_arg (const struct cl_enum_arg *enum_args,
 346                                const char **argp, int value,
 347                                unsigned int lang_mask);
 348 extern void decode_cmdline_options_to_array (unsigned int argc,
 349                                              const char **argv,
 350                                              unsigned int lang_mask,
 351                                              struct cl_decoded_option **decoded_options,
 352                                              unsigned int *decoded_options_count);
 353 extern void init_options_once (void);
 354 extern void init_options_struct (struct gcc_options *opts,
 355                                  struct gcc_options *opts_set);
 356 extern void init_opts_obstack (void);
 357 extern void decode_cmdline_options_to_array_default_mask (unsigned int argc,
 358                                                           const char **argv,
 359                                                           struct cl_decoded_option **decoded_options,
 360                                                           unsigned int *decoded_options_count);
 361 extern void set_default_handlers (struct cl_option_handlers *handlers,
 362                                   void (*target_option_override_hook) (void));
 363 extern void decode_options (struct gcc_options *opts,
 364                             struct gcc_options *opts_set,
 365                             struct cl_decoded_option *decoded_options,
 366                             unsigned int decoded_options_count,
 367                             location_t loc,
 368                             diagnostic_context *dc,
 369                             void (*target_option_override_hook) (void));
 370 extern int option_enabled (int opt_idx, unsigned lang_mask, void *opts);
 371
 372 extern bool get_option_state (struct gcc_options *, int,
 373                               struct cl_option_state *);
 374 extern void set_option (struct gcc_options *opts,
 375                         struct gcc_options *opts_set,
 376                         int opt_index, HOST_WIDE_INT value, const char *arg,
 377                         int kind, location_t loc, diagnostic_context *dc);
 378 extern void *option_flag_var (int opt_index, struct gcc_options *opts);
 379 bool handle_generated_option (struct gcc_options *opts,
 380                               struct gcc_options *opts_set,
 381                               size_t opt_index, const char *arg,
 382                               HOST_WIDE_INT value,
 383                               unsigned int lang_mask, int kind, location_t loc,
 384                               const struct cl_option_handlers *handlers,
 385                               bool generated_p, diagnostic_context *dc);
 386 void generate_option (size_t opt_index, const char *arg, HOST_WIDE_INT value,
 387                       unsigned int lang_mask,
 388                       struct cl_decoded_option *decoded);
 389 void generate_option_input_file (const char *file,
 390                                  struct cl_decoded_option *decoded);
 391 extern void read_cmdline_option (struct gcc_options *opts,
 392                                  struct gcc_options *opts_set,
 393                                  struct cl_decoded_option *decoded,
 394                                  location_t loc,
 395                                  unsigned int lang_mask,
 396                                  const struct cl_option_handlers *handlers,
 397                                  diagnostic_context *dc);
 398 extern void control_warning_option (unsigned int opt_index, int kind,
 399                                     const char *arg, bool imply, location_t loc,
 400                                     unsigned int lang_mask,
 401                                     const struct cl_option_handlers *handlers,
 402                                     struct gcc_options *opts,
 403                                     struct gcc_options *opts_set,
 404                                     diagnostic_context *dc);
 405 extern char *write_langs (unsigned int mask);
 406 extern void print_ignored_options (void);
 407 extern void handle_common_deferred_options (void);
 408 unsigned int parse_sanitizer_options (const char *, location_t, int,
 409                                       unsigned int, int, bool);
 410
 411 unsigned int parse_no_sanitize_attribute (char *value);
 412 extern bool common_handle_option (struct gcc_options *opts,
 413                                   struct gcc_options *opts_set,
 414                                   const struct cl_decoded_option *decoded,
 415                                   unsigned int lang_mask, int kind,
 416                                   location_t loc,
 417                                   const struct cl_option_handlers *handlers,
 418                                   diagnostic_context *dc,
 419                                   void (*target_option_override_hook) (void));
 420 extern bool target_handle_option (struct gcc_options *opts,
 421                                   struct gcc_options *opts_set,
 422                                   const struct cl_decoded_option *decoded,
 423                                   unsigned int lang_mask, int kind,
 424                                   location_t loc,
 425                                   const struct cl_option_handlers *handlers,
 426                                   diagnostic_context *dc,
 427                                   void (*target_option_override_hook) (void));
 428 extern void finish_options (struct gcc_options *opts,
 429                             struct gcc_options *opts_set,
 430                             location_t loc);
 431 extern void print_help (struct gcc_options *opts, unsigned int lang_mask, const
 432                         char *help_option_argument);
 433 extern void default_options_optimization (struct gcc_options *opts,
 434                                           struct gcc_options *opts_set,
 435                                           struct cl_decoded_option *decoded_options,
 436                                           unsigned int decoded_options_count,
 437                                           location_t loc,
 438                                           unsigned int lang_mask,
 439                                           const struct cl_option_handlers *handlers,
 440                                           diagnostic_context *dc);
 441 extern void set_struct_debug_option (struct gcc_options *opts,
 442                                      location_t loc,
 443                                      const char *value);
 444 extern bool opt_enum_arg_to_value (size_t opt_index, const char *arg,
 445                                    int *value,
 446                                    unsigned int lang_mask);
 447
 448 extern const struct sanitizer_opts_s
 449 {
 450   const char *const name;
 451   unsigned int flag;
 452   size_t len;
 453   bool can_recover;
 454 } sanitizer_opts[];
 455
 456 extern const struct zero_call_used_regs_opts_s
 457 {
 458   const char *const name;
 459   unsigned int flag;
 460 } zero_call_used_regs_opts[];
 461
 462 extern vec<const char *> help_option_arguments;
 463
 464 extern void add_misspelling_candidates (auto_vec<char *> *candidates,
 465                                         const struct cl_option *option,
 466                                         const char *base_option);
 467 extern const char *candidates_list_and_hint (const char *arg, char *&str,
 468                                              const auto_vec <const char *> &
 469                                              candidates);
 470
 471
 472 extern bool parse_and_check_align_values (const char *flag,
 473                                           const char *name,
 474                                           auto_vec<unsigned> &result_values,
 475                                           bool report_error,
 476                                           location_t loc);
 477
 478 extern void parse_and_check_patch_area (const char *arg, bool report_error,
 479                                         HOST_WIDE_INT *patch_area_size,
 480                                         HOST_WIDE_INT *patch_area_start);
 481
 482 extern void parse_options_from_collect_gcc_options (const char *, obstack *,
 483                                                     int *);
 484
 485 extern void prepend_xassembler_to_collect_as_options (const char *, obstack *);
 486
 487 extern char *gen_command_line_string (cl_decoded_option *options,
 488                                       unsigned int options_count);
 489 extern char *gen_producer_string (const char *language_string,
 490                                   cl_decoded_option *options,
 491                                   unsigned int options_count);
 492
 493 /* Set OPTION in OPTS to VALUE if the option is not set in OPTS_SET.  */
 494
 495 #define SET_OPTION_IF_UNSET(OPTS, OPTS_SET, OPTION, VALUE) \
 496   do \
 497   { \
 498     if (!(OPTS_SET)->x_ ## OPTION) \
 499       (OPTS)->x_ ## OPTION = VALUE; \
 500   } \
 501   while (false)
 502
 503 #endif