gcc/opts.h

   1 /* Command line option handling.
   2    Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
   3    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 #ifndef GCC_OPTS_H
  22 #define GCC_OPTS_H
  23
  24 #include "input.h"
  25 #include "vec.h"
  26
  27 /* Specifies how a switch's VAR_VALUE relates to its FLAG_VAR.  */
  28 enum cl_var_type {
  29   /* The switch is enabled when FLAG_VAR is nonzero.  */
  30   CLVC_BOOLEAN,
  31
  32   /* The switch is enabled when FLAG_VAR == VAR_VALUE.  */
  33   CLVC_EQUAL,
  34
  35   /* The switch is enabled when VAR_VALUE is not set in FLAG_VAR.  */
  36   CLVC_BIT_CLEAR,
  37
  38   /* The switch is enabled when VAR_VALUE is set in FLAG_VAR.  */
  39   CLVC_BIT_SET,
  40
  41   /* The switch takes a string argument and FLAG_VAR points to that
  42      argument.  */
  43   CLVC_STRING,
  44
  45   /* The switch takes an enumerated argument (VAR_ENUM says what
  46      enumeration) and FLAG_VAR points to that argument.  */
  47   CLVC_ENUM,
  48
  49   /* The switch should be stored in the VEC pointed to by FLAG_VAR for
  50      later processing.  */
  51   CLVC_DEFER
  52 };
  53
  54 struct cl_option
  55 {
  56   /* Text of the option, including initial '-'.  */
  57   const char *opt_text;
  58   /* Help text for --help, or NULL.  */
  59   const char *help;
  60   /* Error message for missing argument, or NULL.  */
  61   const char *missing_argument_error;
  62   /* Warning to give when this option is used, or NULL.  */
  63   const char *warn_message;
  64   /* Argument of alias target when positive option given, or NULL.  */
  65   const char *alias_arg;
  66   /* Argument of alias target when negative option given, or NULL.  */
  67   const char *neg_alias_arg;
  68   /* Alias target, or N_OPTS if not an alias.  */
  69   unsigned short alias_target;
  70   /* Previous option that is an initial substring of this one, or
  71      N_OPTS if none.  */
  72   unsigned short back_chain;
  73   /* Option length, not including initial '-'.  */
  74   unsigned char opt_len;
  75   /* Next option in a sequence marked with Negative, or -1 if none.  */
  76   int neg_index;
  77   /* CL_* flags for this option.  */
  78   unsigned int flags;
  79   /* Disabled in this configuration.  */
  80   BOOL_BITFIELD cl_disabled : 1;
  81   /* Options marked with CL_SEPARATE take a number of separate
  82      arguments (1 to 4) that is one more than the number in this
  83      bit-field.  */
  84   unsigned int cl_separate_nargs : 2;
  85   /* Option is an alias when used with separate argument.  */
  86   BOOL_BITFIELD cl_separate_alias : 1;
  87   /* Alias to negative form of option.  */
  88   BOOL_BITFIELD cl_negative_alias : 1;
  89   /* Option takes no argument in the driver.  */
  90   BOOL_BITFIELD cl_no_driver_arg : 1;
  91   /* Reject this option in the driver.  */
  92   BOOL_BITFIELD cl_reject_driver : 1;
  93   /* Reject no- form.  */
  94   BOOL_BITFIELD cl_reject_negative : 1;
  95   /* Missing argument OK (joined).  */
  96   BOOL_BITFIELD cl_missing_ok : 1;
  97   /* Argument is an integer >=0.  */
  98   BOOL_BITFIELD cl_uinteger : 1;
  99   /* Argument should be converted to lowercase.  */
 100   BOOL_BITFIELD cl_tolower : 1;
 101   /* Report argument with -fverbose-asm  */
 102   BOOL_BITFIELD cl_report : 1;
 103   /* Offset of field for this option in struct gcc_options, or
 104      (unsigned short) -1 if none.  */
 105   unsigned short flag_var_offset;
 106   /* Index in cl_enums of enum used for this option's arguments, for
 107      CLVC_ENUM options.  */
 108   unsigned short var_enum;
 109   /* How this option's value is determined and sets a field.  */
 110   enum cl_var_type var_type;
 111   /* Value or bit-mask with which to set a field.  */
 112   int var_value;
 113 };
 114
 115 /* Records that the state of an option consists of SIZE bytes starting
 116    at DATA.  DATA might point to CH in some cases.  */
 117 struct cl_option_state {
 118   const void *data;
 119   size_t size;
 120   char ch;
 121 };
 122
 123 extern const struct cl_option cl_options[];
 124 extern const unsigned int cl_options_count;
 125 extern const char *const lang_names[];
 126 extern const unsigned int cl_lang_count;
 127
 128 #define CL_PARAMS               (1U << 11) /* Fake entry.  Used to display --param info with --help.  */
 129 #define CL_WARNING              (1U << 12) /* Enables an (optional) warning message.  */
 130 #define CL_OPTIMIZATION         (1U << 13) /* Enables an (optional) optimization.  */
 131 #define CL_DRIVER               (1U << 14) /* Driver option.  */
 132 #define CL_TARGET               (1U << 15) /* Target-specific option.  */
 133 #define CL_COMMON               (1U << 16) /* Language-independent.  */
 134
 135 #define CL_MIN_OPTION_CLASS     CL_PARAMS
 136 #define CL_MAX_OPTION_CLASS     CL_COMMON
 137
 138 /* From here on the bits describe attributes of the options.
 139    Before this point the bits have described the class of the option.
 140    This distinction is important because --help will not list options
 141    which only have these higher bits set.  */
 142
 143 #define CL_JOINED               (1U << 17) /* If takes joined argument.  */
 144 #define CL_SEPARATE             (1U << 18) /* If takes a separate argument.  */
 145 #define CL_UNDOCUMENTED         (1U << 19) /* Do not output with --help.  */
 146
 147 /* Flags for an enumerated option argument.  */
 148 #define CL_ENUM_CANONICAL       (1 << 0) /* Canonical for this value.  */
 149 #define CL_ENUM_DRIVER_ONLY     (1 << 1) /* Only accepted in the driver.  */
 150
 151 /* Structure describing an enumerated option argument.  */
 152
 153 struct cl_enum_arg
 154 {
 155   /* The argument text, or NULL at the end of the array.  */
 156   const char *arg;
 157
 158   /* The corresponding integer value.  */
 159   int value;
 160
 161   /* Flags associated with this argument.  */
 162   unsigned int flags;
 163 };
 164
 165 /* Structure describing an enumerated set of option arguments.  */
 166
 167 struct cl_enum
 168 {
 169   /* Help text, or NULL if the values should not be listed in --help
 170      output.  */
 171   const char *help;
 172
 173   /* Error message for unknown arguments, or NULL to use a generic
 174      error.  */
 175   const char *unknown_error;
 176
 177   /* Array of possible values.  */
 178   const struct cl_enum_arg *values;
 179
 180   /* The size of the type used to store a value.  */
 181   size_t var_size;
 182
 183   /* Function to set a variable of this type.  */
 184   void (*set) (void *var, int value);
 185
 186   /* Function to get the value of a variable of this type.  */
 187   int (*get) (const void *var);
 188 };
 189
 190 extern const struct cl_enum cl_enums[];
 191 extern const unsigned int cl_enums_count;
 192
 193 /* Possible ways in which a command-line option may be erroneous.
 194    These do not include not being known at all; an option index of
 195    OPT_SPECIAL_unknown is used for that.  */
 196
 197 #define CL_ERR_DISABLED         (1 << 0) /* Disabled in this configuration.  */
 198 #define CL_ERR_MISSING_ARG      (1 << 1) /* Argument required but missing.  */
 199 #define CL_ERR_WRONG_LANG       (1 << 2) /* Option for wrong language.  */
 200 #define CL_ERR_UINT_ARG         (1 << 3) /* Bad unsigned integer argument.  */
 201 #define CL_ERR_ENUM_ARG         (1 << 4) /* Bad enumerated argument.  */
 202 #define CL_ERR_NEGATIVE         (1 << 5) /* Negative form of option
 203                                             not permitted (together
 204                                             with OPT_SPECIAL_unknown).  */
 205
 206 /* Structure describing the result of decoding an option.  */
 207
 208 struct cl_decoded_option
 209 {
 210   /* The index of this option, or an OPT_SPECIAL_* value for
 211      non-options and unknown options.  */
 212   size_t opt_index;
 213
 214   /* Any warning to give for use of this option, or NULL if none.  */
 215   const char *warn_message;
 216
 217   /* The string argument, or NULL if none.  For OPT_SPECIAL_* cases,
 218      the option or non-option command-line argument.  */
 219   const char *arg;
 220
 221   /* The original text of option plus arguments, with separate argv
 222      elements concatenated into one string with spaces separating
 223      them.  This is for such uses as diagnostics and
 224      -frecord-gcc-switches.  */
 225   const char *orig_option_with_args_text;
 226
 227   /* The canonical form of the option and its argument, for when it is
 228      necessary to reconstruct argv elements (in particular, for
 229      processing specs and passing options to subprocesses from the
 230      driver).  */
 231   const char *canonical_option[4];
 232
 233   /* The number of elements in the canonical form of the option and
 234      arguments; always at least 1.  */
 235   size_t canonical_option_num_elements;
 236
 237   /* For a boolean option, 1 for the true case and 0 for the "no-"
 238      case.  For an unsigned integer option, the value of the
 239      argument.  1 in all other cases.  */
 240   int value;
 241
 242   /* Any flags describing errors detected in this option.  */
 243   int errors;
 244 };
 245
 246 /* Structure describing an option deferred for handling after the main
 247    option handlers.  */
 248
 249 typedef struct
 250 {
 251   /* Elements from struct cl_decoded_option used for deferred
 252      options.  */
 253   size_t opt_index;
 254   const char *arg;
 255   int value;
 256 } cl_deferred_option;
 257 DEF_VEC_O(cl_deferred_option);
 258 DEF_VEC_ALLOC_O(cl_deferred_option,heap);
 259
 260 /* Structure describing a single option-handling callback.  */
 261
 262 struct cl_option_handler_func
 263 {
 264   /* The function called to handle the option.  */
 265   bool (*handler) (struct gcc_options *opts,
 266                    struct gcc_options *opts_set,
 267                    const struct cl_decoded_option *decoded,
 268                    unsigned int lang_mask, int kind, location_t loc,
 269                    const struct cl_option_handlers *handlers,
 270                    diagnostic_context *dc);
 271
 272   /* The mask that must have some bit in common with the flags for the
 273      option for this particular handler to be used.  */
 274   unsigned int mask;
 275 };
 276
 277 /* Structure describing the callbacks used in handling options.  */
 278
 279 struct cl_option_handlers
 280 {
 281   /* Callback for an unknown option to determine whether to give an
 282      error for it, and possibly store information to diagnose the
 283      option at a later point.  Return true if an error should be
 284      given, false otherwise.  */
 285   bool (*unknown_option_callback) (const struct cl_decoded_option *decoded);
 286
 287   /* Callback to handle, and possibly diagnose, an option for another
 288      language.  */
 289   void (*wrong_lang_callback) (const struct cl_decoded_option *decoded,
 290                                unsigned int lang_mask);
 291
 292   /* Callback to call after the successful handling of any option.  */
 293   void (*post_handling_callback) (const struct cl_decoded_option *decoded,
 294                                   unsigned int mask);
 295
 296   /* The number of individual handlers.  */
 297   size_t num_handlers;
 298
 299   /* The handlers themselves.  */
 300   struct cl_option_handler_func handlers[3];
 301 };
 302
 303 /* Input file names.  */
 304
 305 extern const char **in_fnames;
 306
 307 /* The count of input filenames.  */
 308
 309 extern unsigned num_in_fnames;
 310
 311 size_t find_opt (const char *input, unsigned int lang_mask);
 312 extern int integral_argument (const char *arg);
 313 extern bool enum_value_to_arg (const struct cl_enum_arg *enum_args,
 314                                const char **argp, int value,
 315                                unsigned int lang_mask);
 316 extern void decode_cmdline_options_to_array (unsigned int argc,
 317                                              const char **argv,
 318                                              unsigned int lang_mask,
 319                                              struct cl_decoded_option **decoded_options,
 320                                              unsigned int *decoded_options_count);
 321 extern void init_options_once (void);
 322 extern void init_options_struct (struct gcc_options *opts,
 323                                  struct gcc_options *opts_set);
 324 extern void decode_cmdline_options_to_array_default_mask (unsigned int argc,
 325                                                           const char **argv,
 326                                                           struct cl_decoded_option **decoded_options,
 327                                                           unsigned int *decoded_options_count);
 328 extern void set_default_handlers (struct cl_option_handlers *handlers);
 329 extern void decode_options (struct gcc_options *opts,
 330                             struct gcc_options *opts_set,
 331                             struct cl_decoded_option *decoded_options,
 332                             unsigned int decoded_options_count,
 333                             location_t loc,
 334                             diagnostic_context *dc);
 335 extern int option_enabled (int opt_idx, void *opts);
 336 extern bool get_option_state (struct gcc_options *, int,
 337                               struct cl_option_state *);
 338 extern void set_option (struct gcc_options *opts,
 339                         struct gcc_options *opts_set,
 340                         int opt_index, int value, const char *arg, int kind,
 341                         location_t loc, diagnostic_context *dc);
 342 extern void *option_flag_var (int opt_index, struct gcc_options *opts);
 343 bool handle_generated_option (struct gcc_options *opts,
 344                               struct gcc_options *opts_set,
 345                               size_t opt_index, const char *arg, int value,
 346                               unsigned int lang_mask, int kind, location_t loc,
 347                               const struct cl_option_handlers *handlers,
 348                               diagnostic_context *dc);
 349 void generate_option (size_t opt_index, const char *arg, int value,
 350                       unsigned int lang_mask,
 351                       struct cl_decoded_option *decoded);
 352 void generate_option_input_file (const char *file,
 353                                  struct cl_decoded_option *decoded);
 354 extern void read_cmdline_option (struct gcc_options *opts,
 355                                  struct gcc_options *opts_set,
 356                                  struct cl_decoded_option *decoded,
 357                                  location_t loc,
 358                                  unsigned int lang_mask,
 359                                  const struct cl_option_handlers *handlers,
 360                                  diagnostic_context *dc);
 361 extern void control_warning_option (unsigned int opt_index, int kind,
 362                                     bool imply, location_t loc,
 363                                     unsigned int lang_mask,
 364                                     const struct cl_option_handlers *handlers,
 365                                     struct gcc_options *opts,
 366                                     struct gcc_options *opts_set,
 367                                     diagnostic_context *dc);
 368 extern void print_ignored_options (void);
 369 extern void handle_common_deferred_options (void);
 370 extern bool common_handle_option (struct gcc_options *opts,
 371                                   struct gcc_options *opts_set,
 372                                   const struct cl_decoded_option *decoded,
 373                                   unsigned int lang_mask, int kind,
 374                                   location_t loc,
 375                                   const struct cl_option_handlers *handlers,
 376                                   diagnostic_context *dc);
 377 extern bool target_handle_option (struct gcc_options *opts,
 378                                   struct gcc_options *opts_set,
 379                                   const struct cl_decoded_option *decoded,
 380                                   unsigned int lang_mask, int kind,
 381                                   location_t loc,
 382                                   const struct cl_option_handlers *handlers,
 383                                   diagnostic_context *dc);
 384 extern void finish_options (struct gcc_options *opts,
 385                             struct gcc_options *opts_set,
 386                             location_t loc);
 387 extern void default_options_optimization (struct gcc_options *opts,
 388                                           struct gcc_options *opts_set,
 389                                           struct cl_decoded_option *decoded_options,
 390                                           unsigned int decoded_options_count,
 391                                           location_t loc,
 392                                           unsigned int lang_mask,
 393                                           const struct cl_option_handlers *handlers,
 394                                           diagnostic_context *dc);
 395 extern void set_struct_debug_option (struct gcc_options *opts,
 396                                      location_t loc,
 397                                      const char *value);
 398 #endif