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 # b4_tocpp(STRING)
  22 # ----------------
  23 # Convert STRING into a valid C macro name.
  24 m4_define([b4_tocpp],
  25 [m4_toupper(m4_bpatsubst(m4_quote($1), [[^a-zA-Z0-9]+], [_]))])
  26
  27
  28 # b4_cpp_guard(FILE)
  29 # ------------------
  30 # A valid C macro name to use as a CPP header guard for FILE.
  31 m4_define([b4_cpp_guard],
  32 [b4_tocpp(m4_defn([b4_prefix])/[$1])])
  33
  34
  35 # b4_cpp_guard_open(FILE)
  36 # b4_cpp_guard_close(FILE)
  37 # ------------------------
  38 # Open/close CPP inclusion guards for FILE.
  39 m4_define([b4_cpp_guard_open],
  40 [#ifndef b4_cpp_guard([$1])
  41 # define b4_cpp_guard([$1])])
  42
  43 m4_define([b4_cpp_guard_close],
  44 [#endif b4_comment([!b4_cpp_guard([$1])])])
  45
  46
  47 ## ---------------- ##
  48 ## Identification.  ##
  49 ## ---------------- ##
  50
  51 # b4_comment(TEXT)
  52 # ----------------
  53 m4_define([b4_comment], [/* m4_bpatsubst([$1], [
  54 ], [
  55    ])  */])
  56
  57 # b4_identification
  58 # -----------------
  59 # Depends on individual skeletons to define b4_pure_flag, b4_push_flag, or
  60 # b4_pull_flag if they use the values of the %define variables api.pure or
  61 # api.push-pull.
  62 m4_define([b4_identification],
  63 [[/* Identify Bison output.  */
  64 #define YYBISON 1
  65
  66 /* Bison version.  */
  67 #define YYBISON_VERSION "]b4_version["
  68
  69 /* Skeleton name.  */
  70 #define YYSKELETON_NAME ]b4_skeleton[]m4_ifdef([b4_pure_flag], [[
  71
  72 /* Pure parsers.  */
  73 #define YYPURE ]b4_pure_flag])[]m4_ifdef([b4_push_flag], [[
  74
  75 /* Push parsers.  */
  76 #define YYPUSH ]b4_push_flag])[]m4_ifdef([b4_pull_flag], [[
  77
  78 /* Pull parsers.  */
  79 #define YYPULL ]b4_pull_flag])[
  80 ]])
  81
  82
  83 ## ---------------- ##
  84 ## Default values.  ##
  85 ## ---------------- ##
  86
  87 # b4_api_prefix, b4_api_PREFIX
  88 # ----------------------------
  89 # Corresponds to %define api.prefix
  90 b4_percent_define_default([[api.prefix]], [[yy]])
  91 m4_define([b4_api_prefix],
  92 [b4_percent_define_get([[api.prefix]])])
  93 m4_define([b4_api_PREFIX],
  94 [m4_toupper(b4_api_prefix)])
  95
  96
  97 # b4_prefix
  98 # ---------
  99 # If the %name-prefix is not given, it is api.prefix.
 100 m4_define_default([b4_prefix], [b4_api_prefix])
 101
 102 # If the %union is not named, its name is YYSTYPE.
 103 m4_define_default([b4_union_name], [b4_api_PREFIX[]STYPE])
 104
 105
 106 ## ------------------------ ##
 107 ## Pure/impure interfaces.  ##
 108 ## ------------------------ ##
 109
 110 # b4_user_args
 111 # ------------
 112 m4_define([b4_user_args],
 113 [m4_ifset([b4_parse_param], [, b4_c_args(b4_parse_param)])])
 114
 115
 116 # b4_parse_param
 117 # --------------
 118 # If defined, b4_parse_param arrives double quoted, but below we prefer
 119 # it to be single quoted.
 120 m4_define([b4_parse_param],
 121 b4_parse_param)
 122
 123
 124 # b4_parse_param_for(DECL, FORMAL, BODY)
 125 # ---------------------------------------
 126 # Iterate over the user parameters, binding the declaration to DECL,
 127 # the formal name to FORMAL, and evaluating the BODY.
 128 m4_define([b4_parse_param_for],
 129 [m4_foreach([$1_$2], m4_defn([b4_parse_param]),
 130 [m4_pushdef([$1], m4_unquote(m4_car($1_$2)))dnl
 131 m4_pushdef([$2], m4_shift($1_$2))dnl
 132 $3[]dnl
 133 m4_popdef([$2])dnl
 134 m4_popdef([$1])dnl
 135 ])])
 136
 137 # b4_parse_param_use
 138 # ------------------
 139 # `YYUSE' all the parse-params.
 140 m4_define([b4_parse_param_use],
 141 [b4_parse_param_for([Decl], [Formal], [  YYUSE (Formal);
 142 ])dnl
 143 ])
 144
 145
 146 ## ------------ ##
 147 ## Data Types.  ##
 148 ## ------------ ##
 149
 150 # b4_int_type(MIN, MAX)
 151 # ---------------------
 152 # Return the smallest int type able to handle numbers ranging from
 153 # MIN to MAX (included).
 154 m4_define([b4_int_type],
 155 [m4_if(b4_ints_in($@,      [0],   [255]), [1], [unsigned char],
 156        b4_ints_in($@,   [-128],   [127]), [1], [signed char],
 157
 158        b4_ints_in($@,      [0], [65535]), [1], [unsigned short int],
 159        b4_ints_in($@, [-32768], [32767]), [1], [short int],
 160
 161        m4_eval([0 <= $1]),                [1], [unsigned int],
 162
 163                                                [int])])
 164
 165
 166 # b4_int_type_for(NAME)
 167 # ---------------------
 168 # Return the smallest int type able to handle numbers ranging from
 169 # `NAME_min' to `NAME_max' (included).
 170 m4_define([b4_int_type_for],
 171 [b4_int_type($1_min, $1_max)])
 172
 173
 174 # b4_table_value_equals(TABLE, VALUE, LITERAL)
 175 # --------------------------------------------
 176 # Without inducing a comparison warning from the compiler, check if the
 177 # literal value LITERAL equals VALUE from table TABLE, which must have
 178 # TABLE_min and TABLE_max defined.  YYID must be defined as an identity
 179 # function that suppresses warnings about constant conditions.
 180 m4_define([b4_table_value_equals],
 181 [m4_if(m4_eval($3 < m4_indir([b4_]$1[_min])
 182                || m4_indir([b4_]$1[_max]) < $3), [1],
 183        [[YYID (0)]],
 184        [[((]$2[) == (]$3[))]])])
 185
 186
 187 ## ---------##
 188 ## Values.  ##
 189 ## ---------##
 190
 191
 192 # b4_null_define
 193 # --------------
 194 # Portability issues: define a YY_NULL appropriate for the current
 195 # language (C, C++98, or C++11).
 196 m4_define([b4_null_define],
 197 [# ifndef YY_NULL
 198 #  if defined __cplusplus && 201103L <= __cplusplus
 199 #   define YY_NULL nullptr
 200 #  else
 201 #   define YY_NULL 0
 202 #  endif
 203 # endif[]dnl
 204 ])
 205
 206
 207 # b4_null
 208 # -------
 209 # Return a null pointer constant.
 210 m4_define([b4_null], [YY_NULL])
 211
 212
 213
 214 ## ------------------------- ##
 215 ## Assigning token numbers.  ##
 216 ## ------------------------- ##
 217
 218 # b4_token_define(TOKEN-NAME, TOKEN-NUMBER)
 219 # -----------------------------------------
 220 # Output the definition of this token as #define.
 221 m4_define([b4_token_define],
 222 [#define $1 $2
 223 ])
 224
 225
 226 # b4_token_defines(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
 227 # -------------------------------------------------------
 228 # Output the definition of the tokens (if there are) as #defines.
 229 m4_define([b4_token_defines],
 230 [m4_if([$#$1], [1], [],
 231 [/* Tokens.  */
 232 m4_map([b4_token_define], [$@])])
 233 ])
 234
 235
 236 # b4_token_enum(TOKEN-NAME, TOKEN-NUMBER)
 237 # ---------------------------------------
 238 # Output the definition of this token as an enum.
 239 m4_define([b4_token_enum],
 240 [$1 = $2])
 241
 242
 243 # b4_token_enums(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
 244 # -----------------------------------------------------
 245 # Output the definition of the tokens (if there are) as enums.
 246 m4_define([b4_token_enums],
 247 [m4_if([$#$1], [1], [],
 248 [[/* Tokens.  */
 249 #ifndef ]b4_api_PREFIX[TOKENTYPE
 250 # define ]b4_api_PREFIX[TOKENTYPE
 251    /* Put the tokens into the symbol table, so that GDB and other debuggers
 252       know about them.  */
 253    enum ]b4_api_prefix[tokentype {
 254 ]m4_map_sep([     b4_token_enum], [,
 255 ],
 256            [$@])[
 257    };
 258 #endif
 259 ]])])
 260
 261
 262 # b4_token_enums_defines(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
 263 # -------------------------------------------------------------
 264 # Output the definition of the tokens (if there are any) as enums and, if POSIX
 265 # Yacc is enabled, as #defines.
 266 m4_define([b4_token_enums_defines],
 267 [b4_token_enums($@)b4_yacc_if([b4_token_defines($@)], [])
 268 ])
 269
 270
 271
 272 ## --------------------------------------------- ##
 273 ## Defining C functions in both K&R and ANSI-C.  ##
 274 ## --------------------------------------------- ##
 275
 276
 277 # b4_modern_c
 278 # -----------
 279 # A predicate useful in #if to determine whether C is ancient or modern.
 280 #
 281 # If __STDC__ is defined, the compiler is modern.  IBM xlc 7.0 when run
 282 # as 'cc' doesn't define __STDC__ (or __STDC_VERSION__) for pedantic
 283 # reasons, but it defines __C99__FUNC__ so check that as well.
 284 # Microsoft C normally doesn't define these macros, but it defines _MSC_VER.
 285 # Consider a C++ compiler to be modern if it defines __cplusplus.
 286 #
 287 m4_define([b4_c_modern],
 288   [[(defined __STDC__ || defined __C99__FUNC__ \
 289      || defined __cplusplus || defined _MSC_VER)]])
 290
 291 # b4_c_function_def(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 292 # ----------------------------------------------------------
 293 # Declare the function NAME.
 294 m4_define([b4_c_function_def],
 295 [#if b4_c_modern
 296 b4_c_ansi_function_def($@)
 297 #else
 298 $2
 299 $1 (b4_c_knr_formal_names(m4_shift2($@)))
 300 b4_c_knr_formal_decls(m4_shift2($@))
 301 #endif[]dnl
 302 ])
 303
 304
 305 # b4_c_ansi_function_def(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 306 # ---------------------------------------------------------------
 307 # Declare the function NAME in ANSI.
 308 m4_define([b4_c_ansi_function_def],
 309 [$2
 310 $1 (b4_c_ansi_formals(m4_shift2($@)))[]dnl
 311 ])
 312
 313
 314 # b4_c_ansi_formals([DECL1, NAME1], ...)
 315 # --------------------------------------
 316 # Output the arguments ANSI-C definition.
 317 m4_define([b4_c_ansi_formals],
 318 [m4_if([$#], [0], [void],
 319        [$#$1], [1], [void],
 320                [m4_map_sep([b4_c_ansi_formal], [, ], [$@])])])
 321
 322 m4_define([b4_c_ansi_formal],
 323 [$1])
 324
 325
 326 # b4_c_knr_formal_names([DECL1, NAME1], ...)
 327 # ------------------------------------------
 328 # Output the argument names.
 329 m4_define([b4_c_knr_formal_names],
 330 [m4_map_sep([b4_c_knr_formal_name], [, ], [$@])])
 331
 332 m4_define([b4_c_knr_formal_name],
 333 [$2])
 334
 335
 336 # b4_c_knr_formal_decls([DECL1, NAME1], ...)
 337 # ------------------------------------------
 338 # Output the K&R argument declarations.
 339 m4_define([b4_c_knr_formal_decls],
 340 [m4_map_sep([b4_c_knr_formal_decl],
 341             [
 342 ],
 343             [$@])])
 344
 345 m4_define([b4_c_knr_formal_decl],
 346 [    $1;])
 347
 348
 349
 350 ## ------------------------------------------------------------ ##
 351 ## Declaring (prototyping) C functions in both K&R and ANSI-C.  ##
 352 ## ------------------------------------------------------------ ##
 353
 354
 355 # b4_c_function_decl(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 356 # -----------------------------------------------------------
 357 # Declare the function NAME.
 358 m4_define([b4_c_function_decl],
 359 [#if defined __STDC__ || defined __cplusplus
 360 b4_c_ansi_function_decl($@)
 361 #else
 362 $2 $1 ();
 363 #endif[]dnl
 364 ])
 365
 366
 367 # b4_c_ansi_function_decl(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 368 # ----------------------------------------------------------------
 369 # Declare the function NAME.
 370 m4_define([b4_c_ansi_function_decl],
 371 [$2 $1 (b4_c_ansi_formals(m4_shift2($@)));[]dnl
 372 ])
 373
 374
 375
 376
 377 ## --------------------- ##
 378 ## Calling C functions.  ##
 379 ## --------------------- ##
 380
 381
 382 # b4_c_function_call(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 383 # -----------------------------------------------------------
 384 # Call the function NAME with arguments NAME1, NAME2 etc.
 385 m4_define([b4_c_function_call],
 386 [$1 (b4_c_args(m4_shift2($@)))[]dnl
 387 ])
 388
 389
 390 # b4_c_args([DECL1, NAME1], ...)
 391 # ------------------------------
 392 # Output the arguments NAME1, NAME2...
 393 m4_define([b4_c_args],
 394 [m4_map_sep([b4_c_arg], [, ], [$@])])
 395
 396 m4_define([b4_c_arg],
 397 [$2])
 398
 399
 400 ## ----------- ##
 401 ## Synclines.  ##
 402 ## ----------- ##
 403
 404 # b4_sync_start(LINE, FILE)
 405 # -----------------------
 406 m4_define([b4_sync_start], [[#]line $1 $2])
 407
 408
 409 ## -------------- ##
 410 ## User actions.  ##
 411 ## -------------- ##
 412
 413 # b4_case(LABEL, STATEMENTS)
 414 # --------------------------
 415 m4_define([b4_case],
 416 [  case $1:
 417 $2
 418     break;])
 419
 420 # b4_symbol_actions(FILENAME, LINENO,
 421 #                   SYMBOL-TAG, SYMBOL-NUM,
 422 #                   SYMBOL-ACTION, SYMBOL-TYPENAME)
 423 # -------------------------------------------------
 424 m4_define([b4_symbol_actions],
 425 [m4_pushdef([b4_dollar_dollar],
 426    [m4_ifval([$6], [(yyvaluep->$6)], [(*yyvaluep)])])dnl
 427 m4_pushdef([b4_at_dollar], [(*yylocationp)])dnl
 428       case $4: /* $3 */
 429 b4_syncline([$2], [$1])
 430         $5;
 431 b4_syncline([@oline@], [@ofile@])
 432         break;
 433 m4_popdef([b4_at_dollar])dnl
 434 m4_popdef([b4_dollar_dollar])dnl
 435 ])
 436
 437
 438 # b4_yydestruct_generate(FUNCTION-DECLARATOR)
 439 # -------------------------------------------
 440 # Generate the "yydestruct" function, which declaration is issued using
 441 # FUNCTION-DECLARATOR, which may be "b4_c_ansi_function_def" for ISO C
 442 # or "b4_c_function_def" for K&R.
 443 m4_define_default([b4_yydestruct_generate],
 444 [[/*-----------------------------------------------.
 445 | Release the memory associated to this symbol.  |
 446 `-----------------------------------------------*/
 447
 448 /*ARGSUSED*/
 449 ]$1([yydestruct],
 450     [static void],
 451     [[const char *yymsg],    [yymsg]],
 452     [[int yytype],           [yytype]],
 453     [[YYSTYPE *yyvaluep],    [yyvaluep]][]dnl
 454 b4_locations_if(            [, [[YYLTYPE *yylocationp], [yylocationp]]])[]dnl
 455 m4_ifset([b4_parse_param], [, b4_parse_param]))[
 456 {
 457   YYUSE (yyvaluep);
 458 ]b4_locations_if([  YYUSE (yylocationp);
 459 ])dnl
 460 b4_parse_param_use[]dnl
 461 [
 462   if (!yymsg)
 463     yymsg = "Deleting";
 464   YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp);
 465
 466   switch (yytype)
 467     {
 468 ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[
 469       default:
 470         break;
 471     }
 472 }]dnl
 473 ])
 474
 475
 476 # b4_yy_symbol_print_generate(FUNCTION-DECLARATOR)
 477 # ------------------------------------------------
 478 # Generate the "yy_symbol_print" function, which declaration is issued using
 479 # FUNCTION-DECLARATOR, which may be "b4_c_ansi_function_def" for ISO C
 480 # or "b4_c_function_def" for K&R.
 481 m4_define_default([b4_yy_symbol_print_generate],
 482 [[
 483 /*--------------------------------.
 484 | Print this symbol on YYOUTPUT.  |
 485 `--------------------------------*/
 486
 487 /*ARGSUSED*/
 488 ]$1([yy_symbol_value_print],
 489     [static void],
 490                [[FILE *yyoutput],                       [yyoutput]],
 491                [[int yytype],                           [yytype]],
 492                [[YYSTYPE const * const yyvaluep],       [yyvaluep]][]dnl
 493 b4_locations_if([, [[YYLTYPE const * const yylocationp], [yylocationp]]])[]dnl
 494 m4_ifset([b4_parse_param], [, b4_parse_param]))[
 495 {
 496   FILE *yyo = yyoutput;
 497   YYUSE (yyo);
 498   if (!yyvaluep)
 499     return;
 500 ]b4_locations_if([  YYUSE (yylocationp);
 501 ])dnl
 502 b4_parse_param_use[]dnl
 503 [# ifdef YYPRINT
 504   if (yytype < YYNTOKENS)
 505     YYPRINT (yyoutput, yytoknum[yytype], *yyvaluep);
 506 # else
 507   YYUSE (yyoutput);
 508 # endif
 509   switch (yytype)
 510     {
 511 ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
 512 [      default:
 513         break;
 514     }
 515 }
 516
 517
 518 /*--------------------------------.
 519 | Print this symbol on YYOUTPUT.  |
 520 `--------------------------------*/
 521
 522 ]$1([yy_symbol_print],
 523     [static void],
 524                [[FILE *yyoutput],                       [yyoutput]],
 525                [[int yytype],                           [yytype]],
 526                [[YYSTYPE const * const yyvaluep],       [yyvaluep]][]dnl
 527 b4_locations_if([, [[YYLTYPE const * const yylocationp], [yylocationp]]])[]dnl
 528 m4_ifset([b4_parse_param], [, b4_parse_param]))[
 529 {
 530   if (yytype < YYNTOKENS)
 531     YYFPRINTF (yyoutput, "token %s (", yytname[yytype]);
 532   else
 533     YYFPRINTF (yyoutput, "nterm %s (", yytname[yytype]);
 534
 535 ]b4_locations_if([  YY_LOCATION_PRINT (yyoutput, *yylocationp);
 536   YYFPRINTF (yyoutput, ": ");
 537 ])dnl
 538 [  yy_symbol_value_print (yyoutput, yytype, yyvaluep]dnl
 539 b4_locations_if([, yylocationp])[]b4_user_args[);
 540   YYFPRINTF (yyoutput, ")");
 541 }]dnl
 542 ])
 543
 544 ## -------------- ##
 545 ## Declarations.  ##
 546 ## -------------- ##
 547
 548 # b4_declare_yylstype
 549 # -------------------
 550 # Declarations that might either go into the header (if --defines) or
 551 # in the parser body.  Declare YYSTYPE/YYLTYPE, and yylval/yylloc.
 552 m4_define([b4_declare_yylstype],
 553 [[#if ! defined ]b4_api_PREFIX[STYPE && ! defined ]b4_api_PREFIX[STYPE_IS_DECLARED
 554 ]m4_ifdef([b4_stype],
 555 [[typedef union ]b4_union_name[
 556 {
 557 ]b4_user_stype[
 558 } ]b4_api_PREFIX[STYPE;
 559 # define ]b4_api_PREFIX[STYPE_IS_TRIVIAL 1]],
 560 [m4_if(b4_tag_seen_flag, 0,
 561 [[typedef int ]b4_api_PREFIX[STYPE;
 562 # define ]b4_api_PREFIX[STYPE_IS_TRIVIAL 1]])])[
 563 # define ]b4_api_prefix[stype ]b4_api_PREFIX[STYPE /* obsolescent; will be withdrawn */
 564 # define ]b4_api_PREFIX[STYPE_IS_DECLARED 1
 565 #endif]b4_locations_if([[
 566
 567 #if ! defined ]b4_api_PREFIX[LTYPE && ! defined ]b4_api_PREFIX[LTYPE_IS_DECLARED
 568 typedef struct ]b4_api_PREFIX[LTYPE
 569 {
 570   int first_line;
 571   int first_column;
 572   int last_line;
 573   int last_column;
 574 } ]b4_api_PREFIX[LTYPE;
 575 # define ]b4_api_prefix[ltype ]b4_api_PREFIX[LTYPE /* obsolescent; will be withdrawn */
 576 # define ]b4_api_PREFIX[LTYPE_IS_DECLARED 1
 577 # define ]b4_api_PREFIX[LTYPE_IS_TRIVIAL 1
 578 #endif]])
 579
 580 b4_pure_if([], [[extern ]b4_api_PREFIX[STYPE ]b4_prefix[lval;
 581 ]b4_locations_if([[extern ]b4_api_PREFIX[LTYPE ]b4_prefix[lloc;]])])[]dnl
 582 ])
 583
 584 # b4_YYDEBUG_define
 585 # ------------------
 586 m4_define([b4_YYDEBUG_define],
 587 [[/* Enabling traces.  */
 588 ]m4_if(b4_api_prefix, [yy],
 589 [[#ifndef YYDEBUG
 590 # define YYDEBUG ]b4_debug_flag[
 591 #endif]],
 592 [[#ifndef ]b4_api_PREFIX[DEBUG
 593 # if defined YYDEBUG
 594 #  if YYDEBUG
 595 #   define ]b4_api_PREFIX[DEBUG 1
 596 #  else
 597 #   define ]b4_api_PREFIX[DEBUG 0
 598 #  endif
 599 # else /* ! defined YYDEBUG */
 600 #  define ]b4_api_PREFIX[DEBUG ]b4_debug_flag[
 601 # endif /* ! defined ]b4_api_PREFIX[DEBUG */
 602 #endif  /* ! defined ]b4_api_PREFIX[DEBUG */]])[]dnl
 603 ])
 604
 605 # b4_declare_yydebug
 606 # ------------------
 607 m4_define([b4_declare_yydebug],
 608 [b4_YYDEBUG_define[
 609 #if ]b4_api_PREFIX[DEBUG
 610 extern int ]b4_prefix[debug;
 611 #endif][]dnl
 612 ])
 613
 614 # b4_yylloc_default_define
 615 # ------------------------
 616 # Define YYLLOC_DEFAULT.
 617 m4_define([b4_yylloc_default_define],
 618 [[/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
 619    If N is 0, then set CURRENT to the empty location which ends
 620    the previous symbol: RHS[0] (always defined).  */
 621
 622 #ifndef YYLLOC_DEFAULT
 623 # define YYLLOC_DEFAULT(Current, Rhs, N)                                \
 624     do                                                                  \
 625       if (YYID (N))                                                     \
 626         {                                                               \
 627           (Current).first_line   = YYRHSLOC (Rhs, 1).first_line;        \
 628           (Current).first_column = YYRHSLOC (Rhs, 1).first_column;      \
 629           (Current).last_line    = YYRHSLOC (Rhs, N).last_line;         \
 630           (Current).last_column  = YYRHSLOC (Rhs, N).last_column;       \
 631         }                                                               \
 632       else                                                              \
 633         {                                                               \
 634           (Current).first_line   = (Current).last_line   =              \
 635             YYRHSLOC (Rhs, 0).last_line;                                \
 636           (Current).first_column = (Current).last_column =              \
 637             YYRHSLOC (Rhs, 0).last_column;                              \
 638         }                                                               \
 639     while (YYID (0))
 640 #endif
 641 ]])