data/c.m4

   1                                                             -*- Autoconf -*-
   2
   3 # C M4 Macros for Bison.
   4
   5 # Copyright (C) 2002, 2004-2012 Free Software Foundation, Inc.
   6
   7 # This program is free software: you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation, either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 ## ---------------- ##
  21 ## Identification.  ##
  22 ## ---------------- ##
  23
  24 # b4_comment(TEXT)
  25 # ----------------
  26 m4_define([b4_comment], [/* m4_bpatsubst([$1], [
  27 ], [
  28    ])  */])
  29
  30 # b4_identification
  31 # -----------------
  32 # Depends on individual skeletons to define b4_pure_flag, b4_push_flag, or
  33 # b4_pull_flag if they use the values of the %define variables api.pure or
  34 # api.push-pull.
  35 m4_define([b4_identification],
  36 [[/* Identify Bison output.  */
  37 #define YYBISON 1
  38
  39 /* Bison version.  */
  40 #define YYBISON_VERSION "]b4_version["
  41
  42 /* Skeleton name.  */
  43 #define YYSKELETON_NAME ]b4_skeleton[]m4_ifdef([b4_pure_flag], [[
  44
  45 /* Pure parsers.  */
  46 #define YYPURE ]b4_pure_flag])[]m4_ifdef([b4_push_flag], [[
  47
  48 /* Push parsers.  */
  49 #define YYPUSH ]b4_push_flag])[]m4_ifdef([b4_pull_flag], [[
  50
  51 /* Pull parsers.  */
  52 #define YYPULL ]b4_pull_flag])[
  53
  54 /* Using locations.  */
  55 #define YYLSP_NEEDED ]b4_locations_flag[
  56 ]])
  57
  58
  59 ## ---------------- ##
  60 ## Default values.  ##
  61 ## ---------------- ##
  62
  63 # If the %union is not named, its name is YYSTYPE.
  64 m4_define_default([b4_union_name], [YYSTYPE])
  65
  66 # If the %name-prefix is not given, it is yy.
  67 m4_define_default([b4_prefix], [yy])
  68
  69 ## ------------------------ ##
  70 ## Pure/impure interfaces.  ##
  71 ## ------------------------ ##
  72
  73 # b4_user_args
  74 # ------------
  75 m4_define([b4_user_args],
  76 [m4_ifset([b4_parse_param], [, b4_c_args(b4_parse_param)])])
  77
  78
  79 # b4_parse_param
  80 # --------------
  81 # If defined, b4_parse_param arrives double quoted, but below we prefer
  82 # it to be single quoted.
  83 m4_define([b4_parse_param],
  84 b4_parse_param)
  85
  86
  87 # b4_parse_param_for(DECL, FORMAL, BODY)
  88 # ---------------------------------------
  89 # Iterate over the user parameters, binding the declaration to DECL,
  90 # the formal name to FORMAL, and evaluating the BODY.
  91 m4_define([b4_parse_param_for],
  92 [m4_foreach([$1_$2], m4_defn([b4_parse_param]),
  93 [m4_pushdef([$1], m4_unquote(m4_car($1_$2)))dnl
  94 m4_pushdef([$2], m4_shift($1_$2))dnl
  95 $3[]dnl
  96 m4_popdef([$2])dnl
  97 m4_popdef([$1])dnl
  98 ])])
  99
 100 # b4_parse_param_use
 101 # ------------------
 102 # `YYUSE' all the parse-params.
 103 m4_define([b4_parse_param_use],
 104 [b4_parse_param_for([Decl], [Formal], [  YYUSE (Formal);
 105 ])dnl
 106 ])
 107
 108
 109 ## ------------ ##
 110 ## Data Types.  ##
 111 ## ------------ ##
 112
 113 # b4_int_type(MIN, MAX)
 114 # ---------------------
 115 # Return the smallest int type able to handle numbers ranging from
 116 # MIN to MAX (included).
 117 m4_define([b4_int_type],
 118 [m4_if(b4_ints_in($@,      [0],   [255]), [1], [unsigned char],
 119        b4_ints_in($@,   [-128],   [127]), [1], [signed char],
 120
 121        b4_ints_in($@,      [0], [65535]), [1], [unsigned short int],
 122        b4_ints_in($@, [-32768], [32767]), [1], [short int],
 123
 124        m4_eval([0 <= $1]),                [1], [unsigned int],
 125
 126                                                [int])])
 127
 128
 129 # b4_int_type_for(NAME)
 130 # ---------------------
 131 # Return the smallest int type able to handle numbers ranging from
 132 # `NAME_min' to `NAME_max' (included).
 133 m4_define([b4_int_type_for],
 134 [b4_int_type($1_min, $1_max)])
 135
 136
 137 # b4_table_value_equals(TABLE, VALUE, LITERAL)
 138 # --------------------------------------------
 139 # Without inducing a comparison warning from the compiler, check if the
 140 # literal value LITERAL equals VALUE from table TABLE, which must have
 141 # TABLE_min and TABLE_max defined.  YYID must be defined as an identity
 142 # function that suppresses warnings about constant conditions.
 143 m4_define([b4_table_value_equals],
 144 [m4_if(m4_eval($3 < m4_indir([b4_]$1[_min])
 145                || m4_indir([b4_]$1[_max]) < $3), [1],
 146        [[YYID (0)]],
 147        [[((]$2[) == (]$3[))]])])
 148
 149
 150 ## ---------##
 151 ## Values.  ##
 152 ## ---------##
 153
 154
 155 # b4_null_define
 156 # --------------
 157 # Portability issues: define a YY_NULL appropriate for the current
 158 # language (C, C++98, or C++11).
 159 m4_define([b4_null_define],
 160 [# ifndef YY_NULL
 161 #  if defined __cplusplus && 201103L <= __cplusplus
 162 #   define YY_NULL nullptr
 163 #  else
 164 #   define YY_NULL 0
 165 #  endif
 166 # endif[]dnl
 167 ])
 168
 169
 170 # b4_null
 171 # -------
 172 # Return a null pointer constant.
 173 m4_define([b4_null], [YY_NULL])
 174
 175
 176
 177 ## ------------------------- ##
 178 ## Assigning token numbers.  ##
 179 ## ------------------------- ##
 180
 181 # b4_token_define(TOKEN-NAME, TOKEN-NUMBER)
 182 # -----------------------------------------
 183 # Output the definition of this token as #define.
 184 m4_define([b4_token_define],
 185 [#define $1 $2
 186 ])
 187
 188
 189 # b4_token_defines(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
 190 # -------------------------------------------------------
 191 # Output the definition of the tokens (if there are) as #defines.
 192 m4_define([b4_token_defines],
 193 [m4_if([$#$1], [1], [],
 194 [/* Tokens.  */
 195 m4_map([b4_token_define], [$@])])
 196 ])
 197
 198
 199 # b4_token_enum(TOKEN-NAME, TOKEN-NUMBER)
 200 # ---------------------------------------
 201 # Output the definition of this token as an enum.
 202 m4_define([b4_token_enum],
 203 [$1 = $2])
 204
 205
 206 # b4_token_enums(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
 207 # -----------------------------------------------------
 208 # Output the definition of the tokens (if there are) as enums.
 209 m4_define([b4_token_enums],
 210 [m4_if([$#$1], [1], [],
 211 [/* Tokens.  */
 212 #ifndef YYTOKENTYPE
 213 # define YYTOKENTYPE
 214    /* Put the tokens into the symbol table, so that GDB and other debuggers
 215       know about them.  */
 216    enum yytokentype {
 217 m4_map_sep([     b4_token_enum], [,
 218 ],
 219            [$@])
 220    };
 221 #endif
 222 ])])
 223
 224
 225 # b4_token_enums_defines(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
 226 # -------------------------------------------------------------
 227 # Output the definition of the tokens (if there are any) as enums and, if POSIX
 228 # Yacc is enabled, as #defines.
 229 m4_define([b4_token_enums_defines],
 230 [b4_token_enums($@)b4_yacc_if([b4_token_defines($@)], [])
 231 ])
 232
 233
 234
 235 ## --------------------------------------------- ##
 236 ## Defining C functions in both K&R and ANSI-C.  ##
 237 ## --------------------------------------------- ##
 238
 239
 240 # b4_modern_c
 241 # -----------
 242 # A predicate useful in #if to determine whether C is ancient or modern.
 243 #
 244 # If __STDC__ is defined, the compiler is modern.  IBM xlc 7.0 when run
 245 # as 'cc' doesn't define __STDC__ (or __STDC_VERSION__) for pedantic
 246 # reasons, but it defines __C99__FUNC__ so check that as well.
 247 # Microsoft C normally doesn't define these macros, but it defines _MSC_VER.
 248 # Consider a C++ compiler to be modern if it defines __cplusplus.
 249 #
 250 m4_define([b4_c_modern],
 251   [[(defined __STDC__ || defined __C99__FUNC__ \
 252      || defined __cplusplus || defined _MSC_VER)]])
 253
 254 # b4_c_function_def(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 255 # ----------------------------------------------------------
 256 # Declare the function NAME.
 257 m4_define([b4_c_function_def],
 258 [#if b4_c_modern
 259 b4_c_ansi_function_def($@)
 260 #else
 261 $2
 262 $1 (b4_c_knr_formal_names(m4_shift2($@)))
 263 b4_c_knr_formal_decls(m4_shift2($@))
 264 #endif[]dnl
 265 ])
 266
 267
 268 # b4_c_ansi_function_def(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 269 # ---------------------------------------------------------------
 270 # Declare the function NAME in ANSI.
 271 m4_define([b4_c_ansi_function_def],
 272 [$2
 273 $1 (b4_c_ansi_formals(m4_shift2($@)))[]dnl
 274 ])
 275
 276
 277 # b4_c_ansi_formals([DECL1, NAME1], ...)
 278 # --------------------------------------
 279 # Output the arguments ANSI-C definition.
 280 m4_define([b4_c_ansi_formals],
 281 [m4_if([$#], [0], [void],
 282        [$#$1], [1], [void],
 283                [m4_map_sep([b4_c_ansi_formal], [, ], [$@])])])
 284
 285 m4_define([b4_c_ansi_formal],
 286 [$1])
 287
 288
 289 # b4_c_knr_formal_names([DECL1, NAME1], ...)
 290 # ------------------------------------------
 291 # Output the argument names.
 292 m4_define([b4_c_knr_formal_names],
 293 [m4_map_sep([b4_c_knr_formal_name], [, ], [$@])])
 294
 295 m4_define([b4_c_knr_formal_name],
 296 [$2])
 297
 298
 299 # b4_c_knr_formal_decls([DECL1, NAME1], ...)
 300 # ------------------------------------------
 301 # Output the K&R argument declarations.
 302 m4_define([b4_c_knr_formal_decls],
 303 [m4_map_sep([b4_c_knr_formal_decl],
 304             [
 305 ],
 306             [$@])])
 307
 308 m4_define([b4_c_knr_formal_decl],
 309 [    $1;])
 310
 311
 312
 313 ## ------------------------------------------------------------ ##
 314 ## Declaring (prototyping) C functions in both K&R and ANSI-C.  ##
 315 ## ------------------------------------------------------------ ##
 316
 317
 318 # b4_c_function_decl(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 319 # -----------------------------------------------------------
 320 # Declare the function NAME.
 321 m4_define([b4_c_function_decl],
 322 [#if defined __STDC__ || defined __cplusplus
 323 b4_c_ansi_function_decl($@)
 324 #else
 325 $2 $1 ();
 326 #endif[]dnl
 327 ])
 328
 329
 330 # b4_c_ansi_function_decl(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 331 # ----------------------------------------------------------------
 332 # Declare the function NAME.
 333 m4_define([b4_c_ansi_function_decl],
 334 [$2 $1 (b4_c_ansi_formals(m4_shift2($@)));[]dnl
 335 ])
 336
 337
 338
 339
 340 ## --------------------- ##
 341 ## Calling C functions.  ##
 342 ## --------------------- ##
 343
 344
 345 # b4_c_function_call(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 346 # -----------------------------------------------------------
 347 # Call the function NAME with arguments NAME1, NAME2 etc.
 348 m4_define([b4_c_function_call],
 349 [$1 (b4_c_args(m4_shift2($@)))[]dnl
 350 ])
 351
 352
 353 # b4_c_args([DECL1, NAME1], ...)
 354 # ------------------------------
 355 # Output the arguments NAME1, NAME2...
 356 m4_define([b4_c_args],
 357 [m4_map_sep([b4_c_arg], [, ], [$@])])
 358
 359 m4_define([b4_c_arg],
 360 [$2])
 361
 362
 363 ## ----------- ##
 364 ## Synclines.  ##
 365 ## ----------- ##
 366
 367 # b4_sync_start(LINE, FILE)
 368 # -----------------------
 369 m4_define([b4_sync_start], [[#]line $1 $2])
 370
 371
 372 ## -------------- ##
 373 ## User actions.  ##
 374 ## -------------- ##
 375
 376 # b4_case(LABEL, STATEMENTS)
 377 # --------------------------
 378 m4_define([b4_case],
 379 [  case $1:
 380 $2
 381     break;])
 382
 383 # b4_symbol_actions(FILENAME, LINENO,
 384 #                   SYMBOL-TAG, SYMBOL-NUM,
 385 #                   SYMBOL-ACTION, SYMBOL-TYPENAME)
 386 # -------------------------------------------------
 387 m4_define([b4_symbol_actions],
 388 [m4_pushdef([b4_dollar_dollar],
 389    [m4_ifval([$6], [(yyvaluep->$6)], [(*yyvaluep)])])dnl
 390 m4_pushdef([b4_at_dollar], [(*yylocationp)])dnl
 391       case $4: /* $3 */
 392 b4_syncline([$2], [$1])
 393         $5;
 394 b4_syncline([@oline@], [@ofile@])
 395         break;
 396 m4_popdef([b4_at_dollar])dnl
 397 m4_popdef([b4_dollar_dollar])dnl
 398 ])
 399
 400
 401 # b4_yydestruct_generate(FUNCTION-DECLARATOR)
 402 # -------------------------------------------
 403 # Generate the "yydestruct" function, which declaration is issued using
 404 # FUNCTION-DECLARATOR, which may be "b4_c_ansi_function_def" for ISO C
 405 # or "b4_c_function_def" for K&R.
 406 m4_define_default([b4_yydestruct_generate],
 407 [[/*-----------------------------------------------.
 408 | Release the memory associated to this symbol.  |
 409 `-----------------------------------------------*/
 410
 411 /*ARGSUSED*/
 412 ]$1([yydestruct],
 413     [static void],
 414     [[const char *yymsg],    [yymsg]],
 415     [[int yytype],           [yytype]],
 416     [[YYSTYPE *yyvaluep],    [yyvaluep]][]dnl
 417 b4_locations_if(            [, [[YYLTYPE *yylocationp], [yylocationp]]])[]dnl
 418 m4_ifset([b4_parse_param], [, b4_parse_param]))[
 419 {
 420   YYUSE (yyvaluep);
 421 ]b4_locations_if([  YYUSE (yylocationp);
 422 ])dnl
 423 b4_parse_param_use[]dnl
 424 [
 425   if (!yymsg)
 426     yymsg = "Deleting";
 427   YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp);
 428
 429   switch (yytype)
 430     {
 431 ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[
 432       default:
 433         break;
 434     }
 435 }]dnl
 436 ])
 437
 438
 439 # b4_yy_symbol_print_generate(FUNCTION-DECLARATOR)
 440 # ------------------------------------------------
 441 # Generate the "yy_symbol_print" function, which declaration is issued using
 442 # FUNCTION-DECLARATOR, which may be "b4_c_ansi_function_def" for ISO C
 443 # or "b4_c_function_def" for K&R.
 444 m4_define_default([b4_yy_symbol_print_generate],
 445 [[
 446 /*--------------------------------.
 447 | Print this symbol on YYOUTPUT.  |
 448 `--------------------------------*/
 449
 450 /*ARGSUSED*/
 451 ]$1([yy_symbol_value_print],
 452     [static void],
 453                [[FILE *yyoutput],                       [yyoutput]],
 454                [[int yytype],                           [yytype]],
 455                [[YYSTYPE const * const yyvaluep],       [yyvaluep]][]dnl
 456 b4_locations_if([, [[YYLTYPE const * const yylocationp], [yylocationp]]])[]dnl
 457 m4_ifset([b4_parse_param], [, b4_parse_param]))[
 458 {
 459   if (!yyvaluep)
 460     return;
 461 ]b4_locations_if([  YYUSE (yylocationp);
 462 ])dnl
 463 b4_parse_param_use[]dnl
 464 [# ifdef YYPRINT
 465   if (yytype < YYNTOKENS)
 466     YYPRINT (yyoutput, yytoknum[yytype], *yyvaluep);
 467 # else
 468   YYUSE (yyoutput);
 469 # endif
 470   switch (yytype)
 471     {
 472 ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
 473 [      default:
 474         break;
 475     }
 476 }
 477
 478
 479 /*--------------------------------.
 480 | Print this symbol on YYOUTPUT.  |
 481 `--------------------------------*/
 482
 483 ]$1([yy_symbol_print],
 484     [static void],
 485                [[FILE *yyoutput],                       [yyoutput]],
 486                [[int yytype],                           [yytype]],
 487                [[YYSTYPE const * const yyvaluep],       [yyvaluep]][]dnl
 488 b4_locations_if([, [[YYLTYPE const * const yylocationp], [yylocationp]]])[]dnl
 489 m4_ifset([b4_parse_param], [, b4_parse_param]))[
 490 {
 491   if (yytype < YYNTOKENS)
 492     YYFPRINTF (yyoutput, "token %s (", yytname[yytype]);
 493   else
 494     YYFPRINTF (yyoutput, "nterm %s (", yytname[yytype]);
 495
 496 ]b4_locations_if([  YY_LOCATION_PRINT (yyoutput, *yylocationp);
 497   YYFPRINTF (yyoutput, ": ");
 498 ])dnl
 499 [  yy_symbol_value_print (yyoutput, yytype, yyvaluep]dnl
 500 b4_locations_if([, yylocationp])[]b4_user_args[);
 501   YYFPRINTF (yyoutput, ")");
 502 }]dnl
 503 ])